HIGH-Tc UPDATE E-MAIL VERSION, VOL. 13, NO. 19, Oct. 1, 1999.
<p>
 Published for the Division of Materials Sciences, Office of Basic Energy
 Sciences, USDOE, under Contract W-7405-eng-82 with the Ames Laboratory,
 Iowa State University. Funded by DMS/BES/USDOE, ARPA, and other
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 <hr>
<p>
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<p>
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<p>
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<p>
 Dear Subscribers,
<p>
 Since May 1, 1987, the High-Tc Update has provided you with
 biweekly issues containing the latest information about high-temperature
 superconductivity. We are grateful to the Division of Materials Science
 (Basic Energy Sciences Divison of the Department of Energy) for
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<p>
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<p>
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<p>
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<p>
<p>
 Sincerely,
 Sreeparna Mitra (Editor)
 John R. Clem (Science Editor)
<p>
 <hr>
<p>
 NOTA BENE:
<p>
 RBa2Cu3O7-d
<p>
 The atomic pair distribution functions (PDF) of four powder samples of
 YBa2Cu3O6+x (x = 0.25, 0.45, 0.65, and 0.94) at 15 K have been measured
 by M. Gutmann (Michigan State) et al. using pulsed neutron diffraction.
 Although the authors found no evidence for a split apical oxygen site,
 they did find a slightly improved fit over the average crystallographic
 model when the planar Cu(2) site is split along the z direction. They
 note that the origin of such a split can be explained assuming the
 presence of both Cu^[2+] and Cu^[3+] in the CuO2 planes, as might be
 expected in the presence of charge stripes or polarons.
<p>
 [63,65]^Cu nuclear quadrupole resonance (NQR), [63,65]^Cu nuclear
 magnetic resonance (NMR), and Br K-edge x-ray-absorption fine-structure
 (XAFS) measurement techniques have been used by D. M. Potrepka
 (Connecticut) et al. to study the local structures of Cu and Br in well-
 characterized samples of deoxygenated and brominated YBa2Cu3O7-d. The
 combined results provide a detailed picture of the role of Br in
 reoxygenating the YBCO structure and an explanation for the partial
 restoration of superconductivity in the YBCO system.
<p>
 As noted in preprints by A. Bock and by A. Bock et al. (Hamburg), in
 Raman spectra of cuprate superconductors the gap shows up both directly
 via a redistribution of the electronic background (the so-called 2Delta
 peaks) and indirectly via the renormalization of phononic excitations.
 The authors present a model that permits the study of both effects
 simultaneously, and they apply this model to the B_[1g] phonon of Y1-
 x(Pr,Ca)xBa2Cu3O7 films, where the Pr and Ca substitutions allow
 investigations of under- and overdoped samples. While various self-
 energy effects can be explained by the strength and energy of the 2Delta
 peaks, anomalies remain.
<p>
 A third preprint by A. Bock et al. (Hamburg) reports an investigation of
 the Fano-type line shape of the Ba mode in Y1-xCaxBa2Cu3O6+y films
 observed in Raman spectra with A_[1g] symmetry. The authors use their
 analysis to determine that the phonon intensity originates almost
 entirely from a coupling to a low-energy electronic response. In the
 normal state the authors find that the mass-enhancement factor
 describing the electron-phonon coupling has the value lambda = 6.8+-
 0.5%.
<p>
 A related paper by S. Ostertun et al. (Hamburg) reports a Raman study of
 the superconducting gap and electron-phonon coupling in YbBa2Cu3O7-d
 (Yb-123).
<p>
 A study of various welding techniques to join two or more single-domain
 YBCO monoliths has been carried out by M. P. Delamare (Goettingen and
 Quebec) et al. The authors used energy-dispersive spectroscopy analysis
 across the grain boundaries to determine variations of stoichiometry
 there. The authors also report the effects of using Yb-123 as a welding
 agent.
<p>
 Samples of cation-stoichiometric superconducting SmBa2Cu3O7-d (Sm-123)
 have been synthesized by H. Suenatsu (Tokyo Tech) et al. using a solid-
 state-reaction technique without any liquid phases involved, followed by
 annealing in flowing O2 gas at 350^oC for 40-200 h. The authors
 observed a peak in Jc vs H for mu_0H ~~ 1 T at 77 K. The authors
 discuss the origin of this peak in terms of oxygen nonstoichiometry.
<p>
 The question of whether PrBa2Cu3O7-d (Pr-123) is superconducting or not
 continues to generate controversy. A. M. Araujo-Moreira et al. (Sao
 Carlos) report the observation of superconductivity (superconducting
 fraction about 5%) in sintered, polycrystalline Pr-123 samples with Tc
 ~~ 90 K and H_[c1](0) ~~ 870 Oe. In two preprints by V. N. Narozhnyi
 (Troitsk and Dresden) et al., the authors suggest that the
 superconductivity reported by Z. Zou et al. [Phys. Rev. Lett. 80, 1074
 (1998)] in Pr-123 grown by the traveling-solvent floating zone (TSFZ)
 method is connected with about half the rare-earth sites being occupied
 by Ba, rather than by Pr.
<p>
<p>
 Bi Cuprates
<p>
 The growth of Bi2Sr2-xLaxCaCu2O8+d (Bi-2212) crystals from the melt is
 discussed in papers by H. Jin (Hamburg and Hefei) and J. Koetzler
 (Hamburg) and by H. Jin et al. The authors found that Tc decreases with
 increasing La content according to Tc(x) = Tc(0)(1 - x/x_c), where x_c =
 0.3 is the critical concentration above which the crystals contain the
 pure Bi2(Sr,La)2CuO6 (Bi-2201) phase. The authors also report that
 Bi2Sr2-xLaxCaCu2O8+d whiskers can be grown from Bi-rich melts containing
 La. Within the doping region x = 0.025-0.3, all the grown whiskers are
 of the Bi-2212 pure phase. No whiskers could be obtained from the La-
 free melt with x = 0.
<p>
 The current-voltage (I-V) characteristics of a mesa structure
 microfabricated on the surface of a Bi2Sr2CaCu2O8+d (Bi-2212) single
 crystal have been measured by Y.-J. Doh (POSTECH) et al. Upon the
 application of microwaves of frequency 76 and 94 GHz, the I-V
 characteristics exhibited constant-voltage steps crossing the zero-
 current axis. These steps satisfied the ac Josephson relation, and the
 heights of the steps vs the microwave power showed the expected Bessel-
 function behavior. The data are consistent with modeling a Bi-2212
 crystal as a series array of intrinsic Josephson tunnel junctions
 stacked along the c axis.
<p>
 Studies of radiation-induced enhancements of the critical current in
 [235]^U-doped Bi2Sr2Ca2Cu3O10+d (Bi-2223) tapes are reported by S.
 Toenies (Atominstitut-Wien) et al. Irradiation by thermal neutrons
 causes fission of the U, and the resulting fission tracks significantly
 improve flux pinning and shift the irreversibility line to higher
 fields. The authors found that irradiation enhanced Jc by a factor of
 16 at 4.5 T for H||ab and a factor of 60 at 0.7 T for H||c at 77 K.
 Irradiation also reduces the anisotropy of Jc with respect to the angle
 of H by an order of magnitude (from 37 to 2.4).
<p>
 Similar results showing fission-fragment-track enhancements of the
 critical current and irreversibility line of U-doped Ag-clad Bi-2223
 tapes following thermal-neutron irradiation are reported by S. X. Dou
 (Wollongong) et al. In an attempt to reduce the radioactivity of Ag,
 the authors investigated [235]^U doping levels of 0.15%, 0.2%, 0.4%, and
 0.6%. For the same density of fission-fragment tracks in Bi-2223, the
 lowest radioactivity of Ag resulted from the combination of a higher U
 doping level and a lower thermal-neutron fluence.
<p>
 Two preprints by H. K. Liu (Wollongong) et al. report studies of the
 effects of processing on the properties of Ag-clad Bi-2223 tapes. One
 of these describes phase transformations and liquid phase conversion
 during the final processing step, and the other compares the properties
 of tapes processed with and without hot pressing and post-annealing.
<p>
 Measurements of Jc in Bi-2223/Ag tapes (inferred from magnetization
 hysteresis) vs magnetic field at different temperatures are reported by
 P. N. Mikheenko (Wollongong and Birmingham) et al. The authors identify
 slope changes in plots of lnJc vs H as the values of H vs T where a
 surface-barrier-controlled order-disorder transition occurs. The order-
 disorder line indicates a change in the anisotropy parameter gamma from
 3.4 at low temperatures to about 50 at high temperatures.
<p>
 A preprint by B. de Mayo (State University of West Georgia) reports
 measurements of the critical currents of commercially supplied Bi-
 2223/Ag tapes at 77 K with applied axial stresses of up to 220 MPa. The
 author found that the critical current density decreased linearly with
 increasing strain up to the point of plastic deformation, whereupon Jc
 dropped discontinuously to less than 10% of the unstressed value. The
 resistivity of a pure silver sample at 77 K was measured as a function
 of applied axial stress and found to be constant up to the same point of
 plastic deformation, after which it decreased linearly. The implication
 is that the dislocations and microcracks responsible for plastic
 deformation in the Ag matrix also result in a drastic reduction in Jc,
 probably by interrupting continuous current paths.
<p>
<p>
 Other Cuprates
<p>
 By measuring the temperature dependence of the side-lobes of I_c(H,T),
 the critical current vs magnetic field, of small Josephson bicrystal
 junctions in the electron-doped cuprate superconductor Nd1.85Ce0.15CuO4-
 y, L. Alff (Koeln) et al. have measured the temperature dependence of
 the in-plane London penetration depth lambda_[ab](T). The authors found
 that both I_c(0,T) and lambda_[ab](T) obey an anomalous temperature
 dependence below about 4 K: I_c(0,T) decreases and lambda_[ab](T)
 increases with decreasing temperature below 4 K. Because such behavior
 was found to be absent in Pr1.85Ce0.15CuO4-y, the authors conclude that
 the anomalous behavior in Nd1.85Ce0.15CuO4-y is due to Nd^[3+]
 paramagnetic moments. The authors explain the anomalous temperature
 dependence of lambda_[ab](T) by including the effects of the Nd^[3+]
 moments upon the temperature-dependent permeability in B = mu(T)mu_0H.
 The corrected lambda_[ab](T) is then found to have the usual exponential
 temperature dependence expected for isotropic s-wave pairing, as seen in
 Pr1.85Ce0.15CuO4-y.
<p>
 The influence of defects introduced in the CuO2 planes of cuprates has
 been studied by F. Rullier-Albenque (Ecole Polytechnique) et al. for a
 wide range of hole dopings n. The authors measured the critical
 temperature Tc and electrical resistivity rho(T) in electron-irradiated
 YBa2Cu3O7-d (Y-123) and Tl2Ba2CuO6+d (Tl-2201) single crystals. For all
 the samples investigated here, the authors found a universal scaling
 between the decrease in Tc and Delta[rho]_[2D] x n, where
 Delta[rho]_[2D] is the increase of the 2D resistance induced by the
 defects. The authors find that n is the relevant parameter to describe
 the transport properties over the entire phase diagram, in disagreement
 with a recent suggestion of a change in the number of carriers from n to
 1-n at optimal doping.
<p>
 A preprint by T. Hosomi (Tokyo Tech) et al. reports the magnetic
 irreversibility field H_[irr] for an unstable phase with Tc = 124 K in
 the Ba-Ca-Cu-O system prepared by high-pressure synthesis, as well as
 for a derivative phase with Tc = 78 K obtained by exposing the as-
 synthesized sample to H2O/N2 gas. The unstable phase is of the 0223
 (Ba2Ca2Cu3Oy) structure, consisting of two BaO layers between two
 superconductive Ca2Cu3O6 "infinite-layer" blocks. In a plot of
 logH_[irr] vs log(1 - T/Tc), the irreversibility-field lines for the two
 phases are at nearly the same position, comparable to that reported
 previously for optimally doped Hg-1223.
<p>
 A single-phase sample of TlSr2Ca2Cu3O9 (Tl-1223) in the Tl-Sr series has
 been prepared by S. Adachi (SRL-ISTEC) et al. using high-pressure
 synthesis. The sample exhibited Meissner signals below 86 K. The
 resistivity decreased linearly with decreasing temperature above 86 K,
 and the thermoelectric power at 290 K was found to be nearly zero,
 suggesting that the hole concentration of the sample was nearly
 optimized. The dependence of the irreversibility field B_[irr] on the
 reduced temperature (1 - T/Tc) was found to be similar to that of
 (Cu,C)-1223.
<p>
 The third and fourth members (n = 3 and 4) of the Hg-Sr series HgSr2Can-
 1CunOx [Hg-12(n-1)n] have been stabilized by E. Kandyel et al. (SRL-
 ISTEC) with Bi under high pressures. A sample with nominal composition
 (Hg0.7Bi0.3)Sr2Ca2Cu3O8.55 [(Hg,Bi)-1223] was found to be overdoped. It
 exhibited bulk superconductivity below 105 K as prepared and below 116 K
 after annealing in an Ar/H2 atmosphere. The highest Tc of a sample with
 nominal composition (Hg0.7Bi0.3)Sr2Ca3Cu4O10.15 [(Hg,Bi)-1234] was 96 K
 in the as-prepared form and did not change with annealing.
<p>
 As reported by S. Hebert et al. (Caen), the pinning efficiency of
 orthogonal columnar defects has been investigated in weakly anisotropic
 Tl2/3Bi1/3Sr2CaCu2O7 [(Tl,Bi)-1212] single crystals. Columnar defects
 were introduced by heavy-ion irradiation along two directions tilted by
 45 degrees from the c axis, and the results were compared with those in
 a crystal irradiated along the c axis. The damaged volume was the same
 in both samples. Magnetic measurements performed with H||c showed that
 the perpendicularly crossed defects exhibited the highest pinning
 efficiency over a wide range of fields and temperatures. The authors
 show that this effect cannot be due simply to the increased columnar-
 defect cross section in the ab planes. The results instead support the
 idea that the pinning enhancement observed for orthogonal defects in
 (Tl,Bi)-1212 can be attributed to the same splay effect as observed
 previously in YBCO.
<p>
<p>
 Vortices
<p>
 Two preprints by Y. Yeshurun et al. (Bar-Ilan) and D. Giller et al.
 (Bar-Ilan) report high-temporal-resolution magneto-optical studies of
 the vortex structure in Bi2Sr2CaCu2O8+d (Bi-2212) after a sudden
 application of a magnetic field H_a in the range around the vortex
 solid-solid transition field B_[ss]. For low applied fields, initially
 Bean-like profiles were observed, gradually relaxing into a dome-shaped
 profile in the equilibrium state of the quasi-ordered phase, the final
 profiles being characteristic of Bean-Livingston and geometrical
 barriers. For high fields, however, a boundary between two distinct,
 coexisting vortex-solid phases is observed. Near the edge of the
 sample, where the field is larger than B_[ss], the disordered, high-
 current-density phase appears, while near the center of the sample,
 where the field is less than B_[ss], the quasi-ordered, low-current-
 density phase is present.
<p>
 A new explanation of the second peak in the magnetization loops of high-
 temperature superconductors (the fishtail in YBCO or arrowhead in Bi-
 2212) has been proposed by D. K. Jackson et al. (Imperial College). The
 proposed mechanism involves "dynamical stacking" of vortices, in which
 pinning centers trap more than one vortex. The authors carried out
 Monte Carlo simulations using a multiple occupancy model. The results
 showed a second peak in the magnetization loops and strong effects upon
 the vortex structure, magnetic relaxation, and the distribution of the
 local magnetic induction measured in muon spin-relaxation experiments.
<p>
 A preprint by B. Brown (San Francisco) reports simulations of dc V-I
 data using Gaussian distributions of depinning currents for the mixed
 state. The simulated data were subsequently subjected to a critical
 scaling analysis. Although the simulations assumed no phase transition
 for the vortex matter, the scaled V vs I exhibit data collapse very
 similar to what has often been reported in the experimental literature.
 The resulting "critical parameters" depend on the simulated sensitivity
 level, thus reinforcing doubts about the universality of the scaling
 analysis for V-I characteristics in the high-Tc cuprates.
<p>
 The dependence of the current-voltage (I-V) characteristics of epitaxial
 YBa2Cu3O7-d thin films upon the angle phi between the applied field H
 and the ab planes has been studied by S. K. Gupta (BARC-Mumbai) et al.
 The data show signatures of the vortex-glass transition in the vortex
 lattice at all angles. The critical exponents and the functional form
 of the scaling functions were found to be independent of field and
 angle, indicating universality of the vortex-glass transition. While
 the field and angle dependencies of the scaling functions were found to
 be in agreement with the anisotropic Ginzburg-Landau model when phi > 10
 degrees, sharp changes in the angular scaling, as well as in the scaling
 parameters rho_0, J_0, and T_g, were observed when the field was nearly
 parallel to the ab planes, indicating strong effects of intrinsic
 pinning.
<p>
 An extensive study of the vortex solid-liquid transition in twinned
 YBa2Cu3O7-d single crystals by transport measurements has been carried
 out by B. Maiorov et al. (Bariloche). The authors establish that this
 transition is first-order when the magnetic field H is applied at an
 angle theta away from the direction of the twin planes. The authors
 find that the resistive transitions are hysteretic and the V-I curves
 are nonlinear, displaying a characteristic S shape at the melting line
 H_m(T), which scales with theta according to the anisotropic Ginzburg-
 Landau model. These features are gradually lost when the critical point
 H*(theta) is approached. Above H*(theta), the V-I characteristics show
 a linear response in the experimentally accessible V-I window, and the
 transition becomes reversible. The authors also show that the first-
 order phase transition takes place between a solid state of unknown
 symmetry and a highly correlated vortex liquid in the field direction.
 The authors thus stress that their data support the scenario of line
 melting (melting of the vortex solid into a liquid of correlated vortex
 lines), rather than vortex sublimation (melting into a liquid of
 uncorrelated pancakes), as recently suggested by T. Sasagawa et al.
 [Phys. Rev. Lett. 80, 4297 (1998)].
<p>
 A preprint by J. Govaerts et al. (Louvain) reports theoretical
 investigations of the Ginzburg-Landau equations for a disk. The authors
 numerically obtain axially symmetric solutions (for kappa = 1) depending
 only upon the radial coordinate. In addition to the well-known singly
 quantized Abrikosov vortex solution and the multiply quantized giant
 vortex solution, the authors report annular vortex solutions where the
 order parameter is zero on concentric rings centered on the origin.
<p>
<p>
 Films
<p>
 High-quality NdBa2Cu3O7-d (NBCO) thin films have been successfully grown
 by Y. Li and K. Tanabe (SRL-ISTEC) using on-axis pulsed-laser deposition
 (PLD) and a large single-crystal NBCO target. The authors thoroughly
 investigated the influence of deposition parameters (including the
 substrate temperature, oxygen partial pressure, laser energy density,
 and the target-substrate distance) upon the quality of the resulting
 NBCO thin films. By optimizing the deposition conditions, especially
 the target-substrate distance, the authors were able to eliminate the
 formation of misoriented surface particles and outgrowths, and to obtain
 smooth NBCO films with T_[c0] = 92.5 K and Jc = 4 x 10^6 A/cm^2 at 77 K.
<p>
 Preprints by A. Di Trolio and A. Morone (Tito Scalo) and by A. Di Trolio
 (Tito Scalo) et al. report the growth and compositional analysis of
 SmBa2Cu3O7-d (SBCO) thin films grown by off-axis PLD on different
 substrates (SrTiO3, MgO, LaAlO3, and YSZ). The best film had a zero-
 resistance Tc of about 88 K and a transition width of about 1 K. The
 composition was studied using particles induced x-ray emission (PIXE),
 Rutherford backscattering spectrometry (RBS), and nuclear reaction
 analysis (NRA).
<p>
 As reported by P.V.P.S.S. Sastry et al. (NHMFL-Florida State), thick
 films of Hg0.8Pb0.2Ba2Ca2Cu3Oy [(Hg,Pb)-1223] superconductor have been
 fabricated on silver by dip coating. [(Hg,Pb)-1223] films reacted close
 to the melting temperature exhibited an optimum superconducting
 transition temperature of 135 K. The superconducting layer close to the
 silver interface showed superior magnetization hysteresis in comparison
 with that at the free surface.
<p>
<p>
 Applications
<p>
 A preprint by K. A. Kouznetsov et al. (LBNL and UC-Berkeley) describes
 the fabrication of planar first-derivative gradiometers in which an
 asymmetric flux transformer patterned in a single-layer YBa2Cu3O7-d film
 is permanently bonded to a directly coupled magnetometer based on a dc
 SQUID. The gradiometer baseline is 48 mm, and the common mode rejection
 of uniform magnetic fields is typically one part in a few hundred. The
 outputs of two such gradiometers are subtracted digitally to form a
 second-derivative gradiometer. In addition, three orthogonal SQUID
 magnetometers are used to reduce the residual response to uniform
 magnetic fields to better than 100 ppm. The system is able to detect
 magnetic signals from a human heart in an unshielded environment.
<p>
<p>
 Theory
<p>
 Self-consistent calculations of the spin- and charge-density-wave (SDW
 and CDW) order parameters have been carried out by M. Eremin (Kazan
 State) et al. for bilayered cuprates on the basis of a singlet
 correlated band model. The calculations provide an explanation for the
 experimentally observed evolution of the Fermi surface and the doping
 dependence of the pseudogap formation temperature. The maximum
 incommensurability of the SDW or CDW wave vector occurs at a doping
 level of 0.9-1.1 holes per Cu site.
<p>
 A preprint by J. Zaanen (Leiden) theoretically considers a dynamical
 stripe state of potential significance to cuprate superconductors: a
 gas of elastic quantum strings in 2 + 1 space-time dimensions,
 interacting only via a hard-core condition. The author demonstrates
 that this gas always solidifies, and that the solidification mechanism
 is the quantum analog of the entropic interactions known from soft
 condensed matter physics.
<p>
 Four preprints listed in this issue describe the consequences of a new
 band structure for the cuprate superconductors in which the Cu d_[x^2-
 y^2]/O p_[sigma] (x^2 - y^2) and Cu d_x^2/O' p_z^ (z^2) bands cross at
 the Fermi level. One preprint by J. K. Perry and J. Tahir-Kheli (First
 Principles Research) shows that the unusual observations of a pseudogap
 in the normal state of underdoped Bi2Sr2CaCu2O8+d (Bi-2212) using angle-
 resolved photoemission spectroscopy (ARPES) are consistent with this new
 band structure. A second preprint by the same authors applies this new
 band structure using the 2D Hubbard model to consider superconductivity
 in La1.85Sr0.15CuO4. The authors introduce c-axis dispersion and find
 that the z^2 band has considerable anisotropic 3D character. The
 authors also propose an interband pairing theory of superconductivity
 involving Cooper pairs between the two bands, e.g., (k(up) x2 - y2,
 -k(down) z^2). A preprint by J. Tahir-Kheli describes how the new band
 structure leads to a microscopic theory for the NMR anomalies of the
 planar Cu and O sites in superconducting La1.85Sr0.15CuO4. The theory
 explains the observations without the need to invoke antiferromagnetic
 spin fluctuations on the planar Cu sites and its discrepancy with the
 incommensurate spin fluctuations observed by neutron scattering. A
 preprint by J. K. Perry shows that conventional LDA band-structure
 calculations for La2-xSrxCuO4 and other high-temperature superconductors
 have failed due to an underestimation of static correlations. The
 author explains how this problem has been corrected within the framework
 of a Hubbard model by altering the accounting associated with the self-
 Coulomb term.
<p>
 A calculation of quantum interference corrections to the conductivity in
 a quasi-2D metal as a function of temperature and magnetic field has
 been carried out by A. A. Abrikosov (Argonne). For the temperature
 dependence, a crossover between 2D (higher temperatures) and 3D (lower
 temperatures) behavior is obtained. The magnetic-field dependence of
 the quantum interference correction in the 3D limit is always
 proportional to H^[1/2], while in the 2D limit (perpendicular field) it
 is proportional to ln H in the ab plane and to H^[-1]for the c
 component.
<p>
 The value of the Froehlich electron-phonon interaction in manganites,
 cuprates, and some other charge-transfer insulators has been calculated
 by A. S. Alexandrov (Loughborough) and A. M. Bratkovsky (Hewlett-
 Packard). The authors show that this interaction is much stronger than
 any relevant magnetic interaction. A polaron shift due to the Froehlich
 interaction, which is about 1 eV, suggests that the carriers in those
 systems are small (bi)polarons at all temperatures and doping levels, in
 agreement with the oxygen isotope effect and other data. The authors
 show that an opposite conclusion, recently suggested in the literature,
 is incorrect.
<p>
 Calculations of the upper critical field H_[c2](T) in superconducting
 films as a function of increasing disorder, as measured by the normal-
 state resistance per square, have been carried out by R. A. Smith
 (Birmingham and Cornell) et al. In contradiction to previous work, the
 authors find that there is no anomalous low-temperature positive
 curvature in H_[c2] vs T as disorder is increased, and they show that a
 previous prediction of this effect is due to an unjustified analytical
 approximation of sums occurring in the perturbative calculation. The
 authors' treatment, which includes both first-order perturbation results
 and a nonperturbative resummation technique, shows no anomalous
 curvature in either case.
<p>
 The dc current-voltage characteristics of d-wave Josephson junctions,
 where the barrier at the interface may have arbitrary strength, have
 been calculated by T. Loefwander et al. (Chalmers and Goeteborg).
 Dividing the current into n-particle currents (integer n), the authors
 explicitly show which physical processes are responsible for the
 subharmonic gap structure (SGS). For orientations where midgap states
 (MGS) exist, the resonances in the n-particle processes are drastically
 changed, giving rise to a strongly modified SGS. Introducing a
 broadening phenomenologically, the authors show that MGS may produce a
 current peak near zero bias, and they explain which physical processes
 contribute to this peak.
<p>
 The evidence for 2D and 3D effective dimensionality of the high-Tc
 superconductors as seen in the electrical resistivity, thermal
 conductivity, and specific heat is considered in a preprint by M.
 Ausloos (Liege).
<p>
<p>
 Sr2RuO4
<p>
 Three papers listed in this issue concern the properties of the layered
 perovskite Sr2RuO4, which is believed to be a p-wave superconductor. C.
 Bergemann (Cambridge) et al. describe the application of a novel
 analysis of the field and angle dependence of the quantum-oscillatory
 amplitudes in Sr2RuO4 to map out its Fermi surface in unprecedented
 detail, and to obtain previously inaccessible information on the band
 dispersion. The three quasi-2D Fermi surface sheets exhibit not only
 very diverse magnitudes of warping, but also entirely different dominant
 warping symmetries. The authors use the data to reassess recent results
 on c-axis transport phenomena.
<p>
 The transverse and longitudinal in-plane magnetoresistance in the normal
 state of superconducting Sr2RuO4 single crystals has been measured by R.
 Jin (Penn State) et al. At low temperatures, both were found to be
 positive with a linear magnetic-field dependence above a threshold
 field, a result not expected from electronic band theory. The authors
 argue that such a behavior is a manifestation of a novel coherent state
 characterized by a spin pseudogap in the quasiparticle excitation
 spectrum in Sr2RuO4.
<p>
 A preprint by H.-Y. Lee (UCLA) reports a theoretical study of spin
 dynamics at the nesting vector associated with alpha and beta bands in
 the p-wave superconductor Sr2RuO4. The author finds a collective mode
 at the nesting vector in the superconducting phase identified as the
 odd-parity pairing state that breaks time-reversal symmetry. This mode
 in the spin channel exists only in the p-wave superconductor, not in s-
 or d-wave superconductors. The author proposes that probing this mode
 would help to confirm the pairing symmetry in Sr2RuO4. The author also
 discusses the possibility of a second superconducting phase transition.
<p>
<p>
 Other Activities
<p>
 As noted in a preprint by J. Mannhart and H. Hilgenkamp (Augsburg), the
 symmetry of the order parameter in superconducting compounds has
 generally been considered to be spatially constant, with possible
 deviations at interfaces and defects. The authors point out that even
 in the bulk of a superconductor, the order parameter symmetry (the
 admixture of various symmetry components) may be spatially dependent.
 This implies that the admixture of symmetry components is not
 sufficiently described by numbers epsilon_i (i = s and d, for example)
 but that general functions epsilon_i(r) of real space are required for a
 complete description. As a consequence, measurements of the order
 parameter providing results that seem to disagree may not necessarily
 contradict each other, but may just reflect the fact that the order
 parameter symmetry is probed at different locations or in different
 directions of the unit cell.
<p>
 A novel buckling instability in the critical state of thin type-II
 superconductors with strong pinning has been predicted by R. G. Mints
 (Tel Aviv) and E. H. Brandt (MPI-Stuttgart). This elastic instability
 appears in high perpendicular magnetic fields and may cause an almost
 periodic series of flux jumps visible in the magnetization curve. As an
 illustration, the authors determine the conditions for the buckling
 instability of a long rectangular strip.
<p>
 Studies by L. Civale (Bariloche) et al. of single-crystal YNi2B2C have
 revealed a four-fold anisotropy of the equilibrium magnetization in the
 square crystallographic basal plane. This pi/2 periodicity occurs deep
 in the superconductive mixed state. In this crystal symmetry, an
 ordinary superconductive mass anisotropy (as in the usual London theory)
 allows only a constant, isotropic response. In contrast, the
 experimental results are well described by a generalized London theory
 incorporating nonlocal electrodynamics as needed for this clean,
 intermediate-kappa superconductor.
<p>
<p>
 Overview
<p>
 Some of the early history of the interplay of superconductivity and spin
 fluctuations has been reviewed by D. J. Scalapino (UC-Santa Barbara).
 The author notes that antiferromagnetic spin fluctuations have been
 proposed as the mechanism for d-wave pairing in the heavy-fermion
 superconductors, in some organic materials, and possibly in the high-Tc
 cuprates. The author also discusses what has been learned in recent
 years from numerical studies (35 refs.).
<p>
<p>
 Ph.D. Thesis
<p>
 The Ph.D. thesis of G.G.N. Angilella (Catania) focuses on a theoretical
 study of interlayer pair tunneling in layered cuprates. After reviewing
 some key experimental results that motivate the search for a non-Fermi-
 liquid ground state and for an unconventional pairing mechanism in high-
 temperature superconductors, the author reports on studies of the
 structure of the gap function in k space for a bilayer cuprate
 superconductor, using standard mean-field techniques applied to a two-
 dimensional extended Hubbard model in the presence of coherent
 interlayer pair tunneling and quenched coherent single-particle
 tunneling. An intralayer potential is required as a seed for the
 superconducting instability (212 refs.).
<p>
<p>
 Contributed by John R. Clem
<p>
 <hr>
<p>
 Contents: Technology News is on page 7; Preprints begin on page 8;
 Coming Events begin on page 14; Resources begin on page 14; and FYI is
 on page 15.
<p>
 High-Tc Update is available without charge to interested persons.
 Recipients are expected to participate in this information exchange by
 sending us preprints, reprints, meeting news, research news, etc.
 Contributions to defray the cost of newsletter printing and mailing are
 welcome.
<p>
 <hr>
<p>
 TECHNOLOGY NEWS
 (Also see Applications section of Nota Bene.)
<p>
 This section describes progress in manufacturing, product development,
 and technology transfer in the high-Tc superconductivity field. Please
 send your contributions (product development information, news regarding
 technology transfer efforts, or any information you would like to share
 about your corporation or laboratory) to the editor.
<p>
 In collaboration with the Institute of Cryogenics at the University of
 Southampton, BICC General Superconductors have designed and built a
 prototype pair of 13 kA current leads for the Large Hadron Collider
 project at CERN. Performance tests carried out with the prototype leads
 surpassed their demanding specifications. The measured heat leak of the
 current leads was 0.75 W in standby mode and <1 W at nominal current (13
 kA). The electrical insulation of the leads withstood a voltage of 3.5
 kV between current-carrying elements and ground in a He atmosphere, with
 a partial discharge current < 2 x 10^[-6] A. The pressure drop along
 the resistive section of the current leads was within the specification
 of 50 mbar with a 20 K helium gas flow of < 0.9 gs^[-1] at I = 13 kA.
<p>
 An important success criterion for a current lead to be used in the LHC
 is the ability to survive fault conditions. The prototypes were tested
 under a simulated quench condition with the nominal current being
 exponentially reduced to zero over 120 s. The integrity of the HTS
 section was verified after each quench condition signaled by the voltage
 drop across the top of the HTS elements. The leads were tested with
 various voltage criteria up to 180 mV. The thermal stability of the
 prototypes was studied during the loss of the 20 K cooling gas, with the
 HTS remaining superconducting during the 120 s exponential current
 decay. For more information or technical data, contact Wolfgang Blendl,
 BICC General Superconductors, Oak Road, Wrexham LL13 9XP, United
 Kingdom; telephone +44 1978 662594; telefax +44 1978 662464; e-mail
 <a href="mailto:wblendl@biccgeneral-eu.com">wblendl@biccgeneral-eu.com;</a> Web site <a href="http://www.bicc-sc.com">http://www.bicc-sc.com.</a>
<p>
<p>
 Contributed by Sreeparna Mitra
<p>
 <hr>
<p>
<p>
 PREPRINTS
 To obtain a particular preprint, contact the first author at the address
 given at the end of the citation. Help us expand this list by sending
 us your complete preprint. Please specify where and when your paper was
 submitted. An * next to an entry indicates it is a correction or
 revision of a previous entry. PACS codes and/or key words are given at
 the end of the citation.
<p>
 A. A. Abrikosov, "Quantum Interference Effects in Quasi-2D Metals."
 Contact Janice Coble, Materials Science Division, Argonne National
 Laboratory, 9700 South Cass Avenue, Argonne, IL 60439; telephone (630)
 252-5497; telefax (630) 252-9595; e-mail <a href="mailto:coble@anl.gov">coble@anl.gov.</a> 72.15.Gd;
 72.15.Rn; 73.20.Fz.
<p>
 S. Adachi, T. Shibata, T. Tatsuki, T. Tamura, K. Tanabe, S. Fujihara,
 and T. Kimura, "Synthesis and Characterization of Single-Phase
 TlSr2Ca2Cu3Oy." To be published in Physica C. Superconductivity
 Research Laboratory, International Superconductivity Technology Center
 (ISTEC), 10-13 Shinonome 1-chome, Koto-ku, Tokyo 135-0062, JAPAN; e-mail
 <a href="mailto:adachi@istec.or.jp">adachi@istec.or.jp.</a> Key words: Tl-Sr-Ca-Cu-O, Tl-1223, irreversibility
 field, peak effect, resistivity, thermoelectric power. 74.72.Fq;
 74.25.Fy; 74.25.Ha; 81.20.Zx.
<p>
 A. S. Alexandrov and A. M. Bratkovsky, "The Essential Interactions in
 Oxides and Spectral Weight Transfer in Doped Manganites." Department of
 Physics, Loughborough University, Loughborough Leicestershire LE11 3TU,
 UNITED KINGDOM; e-mail <a href="mailto:asa21@cus.cam.ac.uk">asa21@cus.cam.ac.uk;</a> A. M. Bratkovsky's e-mail at
 Hewlett-Packard Labs <a href="mailto:alexb@hpl.hp.com">alexb@hpl.hp.com;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9908183">http://xxx.lanl.gov/abs/cond-mat/9908183.</a> 71.38.+i; 74.20.Mn; 75.30.Vn;
 78.20.-e.
<p>
 L. Alff, S. Kleefisch, S. Meyer, U. Schoop, A. Marx, H. Sato, M. Naito,
 and R. Gross, "Determination of the Order Parameter Symmetry in Hole and
 Electron Doped Cuprate Superconductors." To be published in Physica B:
 Proc. of the 22nd Int. Conf. on Low Temp. Phys. (LT22), Helsinki,
 Finland, Aug. 5-11, 1999. II. Physikalisches Institut, Universitaet zu
 Koeln, Zuelpicherstr. 77, D-50937 Koeln, GERMANY; e-mail <a href="mailto:alff@ph2.uni-">alff@ph2.uni-</a>
 koeln.de. Key words: symmetry of the order parameter, tunneling
 spectroscopy, Josephson junctions, effects of doping.
<p>
 L. Alff, S. Meyer, S. Kleefisch, U. Schoop, A. Marx, H. Sato, M. Naito,
 and R. Gross, "Anomalous Low Temperature Behavior of Superconducting
 Nd1.85Ce0.15CuO4-y." To be published in Phys. Rev. Lett. II.
 Physikalisches Institut, Universitaet zu Koeln, Zuelpicherstr. 77, D-
 50937 Koeln, GERMANY; e-mail <a href="mailto:alff@ph2.uni-koeln.de">alff@ph2.uni-koeln.de;</a> preprint also
 available at <a href="http://xxx.lanl.gov/abs/cond-mat/9908320">http://xxx.lanl.gov/abs/cond-mat/9908320.</a> 74.25.Fy;
 74.50.+r; 74.25.Ha; 74.72.Jt; 74.76.Bz.
<p>
 C. C. Almasan, G. A. Levin, E. Cimpoiasu, T. Stein, C. L. Zhang, M. C.
 de Andrade, M. B. Maple, Hong Zheng, A. P. Paulikas, and B. W. Veal,
 "Relationship Between Conductivity and Phase Coherence Length in
 Cuprates." To be published in Int. J. Mod. Phys. B. Department of
 Physics, Kent State University, Kent, OH 44242; G. A. Levin's e-mail
 <a href="mailto:levin@physics.kent.edu">levin@physics.kent.edu.</a>
<p>
 B. Andrzejewski, A. Kaczmarek, J. Stankowski, B. Hilczer, J. Marfaing,
 and C. Caranoni, "Magnetic Study of YBCO-PST Composites." To be
 published in Physica B. Institute of Molecular Physics, Polish Academy
 of Sciences, Smoluchowskiego 17, PL-60179 Poznan, POLAND; telephone +48
 61 861 2300; telefax +48 61 868 4524; e-mail <a href="mailto:and@ifmpan.poznan.pl">and@ifmpan.poznan.pl.</a> Key
 words: magnetic susceptibility, electron paramagnetic resonance,
 composites.
<p>
 Giuseppe G. N. Angilella, "Interlayer Pair-Tunneling in Layered
 Cuprates." Submitted as a Ph.D. thesis (Universita degli Studi di
 Catania). Dipartimento di Fisica, Universita degli Studi di Catania, 57
 Corso Italia, I-95129 Catania, ITALY; telephone +39 095 7195 499;
 telefax +39 095 383023; e-mail <a href="mailto:angilella@ct.infn.it">angilella@ct.infn.it.</a>
<p>
 Igor S. Aranson and Len M. Pismen, "Interaction of Vortices in Complex
 Vector Field and Stability of a 'Vortex Molecule.'" Submitted to Phys.
 Rev. Lett. Argonne National Laboratory, 9700 South Cass Avenue,
 Argonne, IL 60439; e-mail <a href="mailto:aronson@vortex.msd.anl.gov">aronson@vortex.msd.anl.gov;</a> preprint also
 available at <a href="http://xxx.lanl.gov/abs/cond-mat/9909108">http://xxx.lanl.gov/abs/cond-mat/9909108.</a> 47.20.Ky;
 47.27.Eq.
<p>
 F. M. Araugo-Moreira, P. N. Lisboa Filho, S. M. Zanetti, E. R. Leite,
 and W. A. Ortiz, "Superconductivity in Sintered-Polycrystalline
 PrBa2Cu3O7-d." To be published in Physica B: Proc. of the 22nd Int.
 Conf. on Low Temp. Phys. (LT22), Helsinki, Finland, Aug. 5-11, 1999.
 Grupo de Supercondutividade e Magnetismo, Departamento de Fisica,
 Universidade Federal de Sao Carlos, Caixa Postal 676, 13565-905 Sao
 Carlos-SP, BRAZIL; telephone +55 16 260 8223; telefax +55 16 261 4835;
 e-mail <a href="mailto:faraujo@power.ufscar.br">faraujo@power.ufscar.br;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9909086">http://xxx.lanl.gov/abs/cond-mat/9909086.</a> Key words:
 superconductivity, PBCO. 74.72.Jt.
<p>
 M. Ausloos, "2D and 3D Signatures in High Tc Superconductors." To be
 published in Molecular Phys. Reports. SUPRAS, Institute of Physics B5,
 University of Liege, B-4000 Liege, BELGIUM.
<p>
 C. Bergemann, S. R. Julian, A. P. Mackenzie, S. Nishizaki, and Y. Maeno,
 "Detailed Topography of the Fermi Surface of Sr2RuO4." Low Temperature
 Physics Group, Cavendish Laboratory, University of Cambridge, Madingley
 Road, Cambridge CB3 0HE, UNITED KINGDOM; telephone +44 1223 337422;
 telefax +44 1223 363263; e-mail <a href="mailto:cb203@cus.cam.ac.uk">cb203@cus.cam.ac.uk;</a> preprint also
 available at <a href="http://xxx.lanl.gov/abs/cond-mat/9909027">http://xxx.lanl.gov/abs/cond-mat/9909027.</a> 71.18.+y;
 71.27.+a; 74.25.Jb.
<p>
 Andreas Bock, "Electronic Raman Scattering and Phonon Self-Energy
 Effects in the RE-123 System: Signatures of Gap and Pseudogap." To be
 published in Annalen der Physik. Institut fuer Angewandte Physik und
 Zentrum fuer Mikrostrukturforschung, Universitaet Hamburg,
 Jungiusstrasse 11, D-20355 Hamburg, GERMANY; preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9908360">http://xxx.lanl.gov/abs/cond-mat/9908360</a> or <a href="http://www.physnet.uni-">http://www.physnet.uni-</a>
 hamburg.de/home/vms/bock/annalen.htm. 74.25.Gz; 74.62.Dh; 74.72.Bk;
 74.76.Bz; 78.30.-j.
<p>
 A. Bock, S. Ostertun, R. Das Sharma, M. Ruebhausen, K.-O. Subke, and C.
 T. Rieck, "Anomalous Self-Energy Effects of the B_[1g] Phonon in Y1-
 x(Pr,Ca)xBa2Cu3O7 Films." To be published in Phys. Rev. B. Institut
 fuer Angewandte Physik und Zentrum fuer Mikrostrukturforschung,
 Universitaet Hamburg, Jungiusstrasse 11, D-20355 Hamburg, GERMANY; S.
 Ostertun's telephone +49 40 42838 6535; telefax +49 40 42838 4368; e-
 mail <a href="mailto:ostertun@physnet.uni-hamburg.de">ostertun@physnet.uni-hamburg.de;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9908355">http://xxx.lanl.gov/abs/cond-mat/9908355.</a> 74.25.Gz; 74.62.Dh; 74.72.Bk;
 74.76.Bz; 78.30.Er.
<p>
 A. Bock, S. Ostertun, and K.-O. Subke, "Electron-Phonon Coupling Deduced
 from Phonon Line Shapes." Presented at the Int. Conf. on Solid State
 Spectroscopy (ICSSS), Schwaebisch Gmuend, Germany, Sept. 5-7, 1999; to
 be published in Phys. Status Solidi (b). Institut fuer Angewandte
 Physik und Zentrum fuer Mikrostrukturforschung, Universitaet Hamburg,
 Jungiusstrasse 11, D-20355 Hamburg, GERMANY; S. Ostertun's telephone +49
 40 42838 6535; telefax +49 40 42838 4368; e-mail <a href="mailto:ostertun@physnet.uni-">ostertun@physnet.uni-</a>
 hamburg.de; preprint also available at <a href="http://xxx.lanl.gov/abs/cond-">http://xxx.lanl.gov/abs/cond-</a>
 mat/9908356. 74.25.Gz; 74.62.Dh; 74.72.Bk; 74.76.Bz; 78.30.Er.
<p>
 V. N. Bogomolov, "Metallic Sulphur: 'Electronic' Mechanism of
 Superconductivity?" A.F. Ioffe Physico-Technical Institute, Russian
 Academy of Sciences, 26 Polyteknicheskaya, St. Petersburg 194021,
 RUSSIA; e-mail <a href="mailto:v.bogomolov@shuvpop.ioffe.rssi.ru">v.bogomolov@shuvpop.ioffe.rssi.ru;</a> preprint also
 available at <a href="http://xxx.lanl.gov/abs/cond-mat/9908467">http://xxx.lanl.gov/abs/cond-mat/9908467.</a>
<p>
 Brandon Brown, "A Simulation of dc Resistivity Data: Questioning
 Critical Scaling for the High-Tc Copper Oxides." Submitted to Phys.
 Rev. B. Department of Physics, College of Arts and Sciences, 2130
 Fulton Street, University of San Francisco, San Francisco, CA 94117-
 1080; telephone (415) 422-5065; telefax (415) 422-5155; e-mail
 <a href="mailto:brownb@usfca.edu">brownb@usfca.edu.</a> 74.60.-w; 74.60.Ge; 74.72.-h.
<p>
 L. Civale, A. V. Silhanek, J. R. Thompson, K. J. Song, C. V. Tomy, and
 D. McK. Paul, "Four-Fold Basal Plane Anisotropy of the Nonlocal
 Magnetization of YNi2B2C." Submitted to Phys. Rev. Lett. Comision
 Nacional de Energia Atomica, Centro Atomico Bariloche, 8400 Bariloche,
 ARGENTINA; A. V. Silhanek's e-mail <a href="mailto:silhanek@cabbat1.cnea.gov.ar">silhanek@cabbat1.cnea.gov.ar;</a>
 preprint also available at <a href="http://xxx.lanl.gov/abs/cond-mat/9908483">http://xxx.lanl.gov/abs/cond-mat/9908483.</a>
<p>
 M. P. Delamare, H. Walter, B. Bringmann, A. Leenders, and H. C.
 Freyhardt, "Characterization of Natural and Artificial Low-Angle-
 Boundaries in YBCO TSMG Samples." To be published in Physica C.
 Contact A. Leenders, Zentrum fuer Funktionswerkstoffe Goettingen,
 Windausweg 2, D-37073 Goettingen, GERMANY; telephone +49 551 507 1730;
 telefax +49 551 507 1750; e-mail <a href="mailto:leenders@umpsun1.gwdg.de">leenders@umpsun1.gwdg.de.</a> Key words:
 melt-textured superconductors, Y-based cuprates, welding, low-angle
 boundaries. 81.10.-h; 74.72.Bk; 81.20.Vj.
<p>
 Ben de Mayo, "Critical Current Dependence on Axial Strain at LN2
 Temperature of Ag-Clad Bi(2223) Tapes." To be published in Int. J. Mod.
 Phys. B: Proc. of the Second Int. Conf. on New Theories, Discoveries
 and Applications of Superconductors and Related Materials (New3SC-2),
 Las Vegas, Nev., May 31-June 4, 1999. Department of Mathematics and
 Physics, State University of West Georgia, Carrollton, GA 30118.
<p>
 A. Di Trolio and A. Morone, "Comparative Analysis of the Growth of
 SmBa2Cu3O7-x Thin Films by Off-Axis Pulsed Laser Deposition on Different
 Substrates." To be published in Appl. Phys. A. CNR, Istituto per i
 Materiali Speciali, Via S. Loja, I-85050 Tito Scalo (PZ), ITALY;
 telephone +39 0971 427243; telefax +39 0971 427222; e-mail
 <a href="mailto:ditrolio@ims.pz.cnr.it">ditrolio@ims.pz.cnr.it.</a> 74.76.Bz; 74.72.Jt; 74.62.Bf.
<p>
 A. Di Trolio, A. Morone, N. De Cesare, E. Perillo, and G. Spadaccini,
 "Compositional Analysis of SmBa2Cu3O7-x Films Produced by Laser
 Ablation." To be published in Applied Surface Science. CNR, Istituto
 per i Materiali Speciali, Via S. Loja, I-85050 Tito Scalo (PZ), ITALY;
 telephone +39 0971 427243; telefax +39 0971 427222; e-mail
 <a href="mailto:ditrolio@ims.pz.cnr.it">ditrolio@ims.pz.cnr.it.</a> Key words: laser ablation, superconducting
 films, SmBa2Cu3O7-x, PIXE, RBS, NRA.
<p>
 Yong-Joo Doh, Jinhee Kim, Kyu-Tae Kim, and Hu-Jong Lee, "Microwave-
 Induced Constant Voltage Steps in Surface Junctions of Bi2Sr2CaCu2O8+d
 Single Crystals." Submitted to Phys. Rev. B. Department of Physics,
 Pohang University of Science and Technology, Pohang 790-784, SOUTH
 KOREA; e-mail <a href="mailto:doooh@anyon.postech.ac.kr">doooh@anyon.postech.ac.kr;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9908459">http://xxx.lanl.gov/abs/cond-mat/9908459.</a>
<p>
 S. X. Dou, Y. C. Guo, D. Marinaro, J. W. Boldeman, J. Horvat, P. Yao, R.
 Weinstein, A. Gandini, R. Sawh, and Y. Ren, "Effect of U-Doping Level on
 Flux Pinning and Radioactivity in Silver-Clad Bi-2223 Tapes Using
 Thermal Neutron Irradiation." To be published in the Proc. of the Int.
 Cryogenic Mater. Conf. (ICMC'99), Montreal, Quebec, Canada, July 12-16,
 1999. Institute for Superconducting and Electronic Materials,
 University of Wollongong, NSW 2522, AUSTRALIA.
<p>
 M. Eremin, S. Varlamov, and I. Eremin, "How Large Can SDW and CDW
 Amplitudes be in Underdoped Cuprates?" Submitted to Appl. Magnetic
 Resonance: Proc. of the Specialized Colloque AMPERE, Pisa, Italy, June
 14-18, 1999. Kazan State University, 420008 Kazan, RUSSIA; S.
 Varlamov's telephone at Cottbus Technical University, Germany +49 355
 693010; telefax +49 355 693011; e-mail <a href="mailto:sergev@physik.tu-cottbus.de">sergev@physik.tu-cottbus.de;</a>
 preprint also available at <a href="http://xxx.lanl.gov/abs/cond-mat/9908297">http://xxx.lanl.gov/abs/cond-mat/9908297.</a>
<p>
 T. S. Evans and D. A. Steer, "Non-Equilibrium, Time-Dependent Effective
 Theory of a Weakly Coupled Superconductor at Finite Temperature."
 Report #Imperial/TP/98-99/50. Theoretical Physics, Blackett Laboratory,
 Imperial College, Prince Consort Road, London SW7 2BZ, UNITED KINGDOM;
 e-mail <a href="mailto:t.evans@ic.ac.uk">t.evans@ic.ac.uk;</a> D. A. Steer's e-mail <a href="mailto:d.a.steer@damtp.cam.ac.uk">d.a.steer@damtp.cam.ac.uk;</a>
 preprint also available at <a href="http://xxx.lanl.gov/abs/cond-mat/9909103">http://xxx.lanl.gov/abs/cond-mat/9909103.</a>
<p>
 D. Giller, Y. Wolfus, A. Shaulov, and Y. Yeshurun, "High Temporal
 Resolution Magneto-Optical Study of the Vortex Solid-Solid Transition in
 Bi2Sr2CaCu2O8 Crystal." Submitted to Physica B. Institute of
 Superconductivity, Department of Physics, Bar-Ilan University, Ramat Gan
 52900, ISRAEL; e-mail <a href="mailto:giller@mail.biu.ac.il">giller@mail.biu.ac.il.</a> Key words: high-
 temperature superconductors, vortex phases, vortex dynamics, magneto-
 optics.
<p>
 Jan Govaerts, Geoffrey Stenuit, Damien Bertrand, and Olivier van der Aa,
 "Annular Vortex Solutions to the Landau-Ginzburg Equations in Mesoscopic
 Superconductors." Institut de Physique Nucleaire, Universite Catholique
 de Louvain, Chemin du Cyclotron 2, B-1348 Louvain-la-Neuve, BELGIUM;
 telephone +32 10 47 32 73; telefax +32 10 45 21 83; e-mail
 <a href="mailto:govaerts@fynu.ucl.ac.be">govaerts@fynu.ucl.ac.be;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9908451">http://xxx.lanl.gov/abs/cond-mat/9908451.</a> 74.20.De; 74.60.Ec.
<p>
 Thomas Gramespacher and Markus Buettiker, "Distribution Functions and
 Current Correlations in Normal-Metal--Superconductor Heterostructures."
 Departement de Physique Theorique, Universite de Geneve, 24 quai Ernest-
 Ansermet, CH-1211 Geneva 4, SWITZERLAND. 73.20.At; 74.50.+r; 72.70.+m;
 73.23.-b.
<p>
 S. K. Gupta, Shashwati Sen, J. C. Vyas, S. P. Pai, R. Pinto, and V. C.
 Sahni, "Angular Dependence of Vortex Glass Transition in YBa2Cu3Ox Thin
 Films." Submitted to Physica C. Technical Physics and Prototype
 Engineering Division, Bhabha Atomic Research Center, Mumbai 400 085,
 INDIA; telefax +91 22 550 5151; e-mail <a href="mailto:tfds@apsara.barc.ernet.in">tfds@apsara.barc.ernet.in.</a>
<p>
 M. Gutmann, S.J.L. Billinge, E. L. Brosha, and G. H. Kwei, "Possible
 Charge Inhomogeneities in the CuO2 Planes of YBa2Cu3O6+x (x = 0.25,
 0.45, 0.65, 0.94) from Pulsed Neutron Diffraction." Submitted to Phys.
 Rev. B. Department of Physics and Astronomy and Center for Fundamental
 Materials Research, Michigan State University, East Lansing, MI 48824-
 1116; e-mail <a href="mailto:gutmann@pa.msu.edu">gutmann@pa.msu.edu;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9908365">http://xxx.lanl.gov/abs/cond-mat/9908365.</a>
<p>
 S. Hebert, V. Hardy, Ch. Simon, and J. Provost, "Large Pinning
 Efficiency of Orthogonal Columnar Defects in a Weakly Anisotropic High-
 Tc Superconductor." To be published in Phys. Rev. B. Experimental
 Solid State Physics, Blackett Laboratory, Imperial College, Prince
 Consort Road, London SW7 2BZ, UNITED KINGDOM; e-mail <a href="mailto:s.hebert@ic.ac.uk">s.hebert@ic.ac.uk.</a>
 Key words: Tl-based superconductors, heavy-ion irradiation, columnar
 defects, critical current densities. 74.72.Hs; 74.60.Ge; 74.60.Jg;
 61.80.Jh.
<p>
 H. Hoppe, U. Zuelicke, and Gerd Schoen, "Andreev Reflection in Strong
 Magnetic Fields." Institut fuer Theoretische Festkoerperphysik,
 Universitaet Karlsruhe, D-76128 Karlsruhe, GERMANY; U. Zuelicke's
 telephone +49 721 608 6030; telefax +49 721 69 8150; e-mail
 <a href="mailto:ulrich.zuelicke@phys.uni-karlsruhe.de">ulrich.zuelicke@phys.uni-karlsruhe.de.</a> 74.80.Fp; 73.20.-r; 71.70.Di;
 73.40.-c.
<p>
 T. Hosomi, H. Suematsu, M. Karppinen, and H. Yamauchi, "Magnetic
 Irreversibility Characteristics of Highly Unstable Superconducting
 Ba2Ca2Cu3Oy and Its Derivative Phase." To be published in Physica C.
 Contact H. Yamauchi, Materials & Structures Laboratory, Tokyo Institute
 of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 227, JAPAN; telephone
 +81 45 924-5315; telefax +81 45 924-5365 or -5360; e-mail
 <a href="mailto:yamauchi@materia.titech.ac.jp">yamauchi@materia.titech.ac.jp.</a>
<p>
 D. K. Jackson, M. Nicodemi, G. Perkins, N. A. Lindop, and Henrik
 Jeldtoft Jensen, "Stacking of Vortices: The Origin of the Second Peak
 in the Magnetization Loops of High Temperature Superconductors."
 Contact Henrik Jeldtoft Jensen, Department of Mathematics, Imperial
 College, London SW7 2BZ, UNITED KINGDOM; e-mail <a href="mailto:h.jensen@ic.ac.uk">h.jensen@ic.ac.uk;</a>
 preprint also available at <a href="http://xxx.lanl.gov/abs/cond-mat/9908454">http://xxx.lanl.gov/abs/cond-mat/9908454.</a>
<p>
 H. Jin and J. Koetzler, "Effect of La Doping on Growth and
 Superconductivity of Bi-2212 Crystals." To be published in Physica C.
 Institut fuer Angewandte Physik, Universitaet Hamburg, Jungiusstrasse
 11, D-20355 Hamburg, GERMANY; telephone +49 40 42838 5254; telefax +49
 40 42838 3589; e-mail <a href="mailto:jinhua@physnet.uni-hamburg.de">jinhua@physnet.uni-hamburg.de;</a> preprint also
 available at <a href="http://xxx.lanl.gov/abs/cond-mat/9909077">http://xxx.lanl.gov/abs/cond-mat/9909077.</a> Key words:
 crystal growth, Bi-2212, substitution effects, structure, transition
 temperature.
<p>
 H. Jin, S. Skwirblies, and J. Koetzler, "Growth and Characterization of
 BiSCCO 2212 Whiskers from Melts Containing Various La Contents." To be
 published in J. Cryst. Growth. Institut fuer Angewandte Physik,
 Universitaet Hamburg, Jungiusstrasse 11, D-20355 Hamburg, GERMANY;
 telephone +49 40 42838 5254; telefax +49 40 42838 3589; e-mail
 <a href="mailto:jinhua@physnet.uni-hamburg.de">jinhua@physnet.uni-hamburg.de;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9909076">http://xxx.lanl.gov/abs/cond-mat/9909076.</a> Key words: whiskers, La-
 doped Bi-2212, melt growth method, superconducting. 74.62.Dh; 74.62.-c;
 74.72.Hs; 81.10.Fq.
<p>
 R. Jin, Y. Liu, and F. Lichtenberg, "Linear Field Dependence of the
 Normal-State In-Plane Magnetoresistance of Sr2RuO4." To be published in
 Phys. Rev. B. Department of Physics, Pennsylvania State University,
 University Park, PA 16802; e-mail <a href="mailto:jin@phys.psu.edu">jin@phys.psu.edu;</a> preprint also
 available at <a href="http://xxx.lanl.gov/abs/cond-mat/9908280">http://xxx.lanl.gov/abs/cond-mat/9908280.</a> 74.70.-b;
 74.25.Fy; 74.25.Ha; 74.72.Yg.
<p>
 E. Kandyel, S. Adachi, and S. Tajima, "Synthesis, Structure and
 Superconductivity of (La1.5Pb0.5-xSrx)CuOz." To be published in J.
 Supercond. Superconductivity Research Laboratory, International
 Superconductivity Technology Center (ISTEC), 10-13 Shinonome 1-chome,
 Koto-ku, Tokyo 135-0062, JAPAN. Key words: superconductivity, crystal
 structure, magnetization, 214.
<p>
 E. Kandyel, S. Adachi, X.-J. Wu, and S. Tajima, "Structural and
 Superconducting Properties of (Hg0.7Bi0.3)Sr2Can-1CunOx (n=3,4)
 Superconductors Synthesized Under High Pressure." To be published in
 Supercond. Sci. & Technol. Superconductivity Research Laboratory,
 International Superconductivity Technology Center (ISTEC), 10-13
 Shinonome 1-chome, Koto-ku, Tokyo 135-0062, JAPAN.
<p>
 J. M. Keartland and R. A. Doyle, "Transport Measurements in BSCCO-2212
 in High Magnetic Fields." To be published in Physica B: Proc. of the
 22nd Int. Conf. on Low Temp. Phys. (LT22), Helsinki, Finland, Aug. 5-11,
 1999. Department of Physics, University of the Witwatersrand, P.O. WITS
 2050, Johannesburg, SOUTH AFRICA; telephone +27 11 716 4209; telefax +27
 11 339 8262; e-mail <a href="mailto:ktland@physnet.phys.wits.ac.za">ktland@physnet.phys.wits.ac.za;</a> preprint also
 available at <a href="http://xxx.lanl.gov/abs/cond-mat/9908354">http://xxx.lanl.gov/abs/cond-mat/9908354.</a> Key words:
 vortex-glass transition, transport measurements, single crystal BSCCO-
 2212, angular dependence.
<p>
 Hae-Young Kee, "Probing Pairing Symmetry in Sr2RuO4." Department of
 Physics, University of California, Los Angeles, CA 90095; e-mail
 <a href="mailto:hykee@cooper.physics.ucla.edu">hykee@cooper.physics.ucla.edu;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9908486">http://xxx.lanl.gov/abs/cond-mat/9908486.</a> 75.40.Gb; 74.25.Ha; 74.25.Nf.
<p>
 S. Khlebnikov, "Thermal Fluctuations in Macroscopic Quantum Memory."
 Preprint #PURD-TH-99-07. Department of Physics, Purdue University, West
 Lafayette, IN 47907; e-mail <a href="mailto:skhleb@euler.physics.purdue.edu">skhleb@euler.physics.purdue.edu;</a> preprint
 also available at <a href="http://xxx.lanl.gov/abs/cond-mat/9909024">http://xxx.lanl.gov/abs/cond-mat/9909024.</a> 85.25.Hv;
 03.67.Lx.
<p>
 Hyun-Tak Kim, Yong-Jihn Kim, and Kwang-Yong Kang, "Possible p-Wave
 Condensed Conductor (or Superconductor) for La1-xCaxMnO3 Films." To be
 published in Int. J. Mod. Phys. B: Proc. of the Second Int. Conf. on
 New Theories, Discoveries and Applications of Superconductors and
 Related Materials (New3SC-2), Las Vegas, Nev., May 31-June 4, 1999.
 Telecom. Basic Research Lab., Electron Telecommunication Research
 Institute (ETRI), Taejon 305-350, KOREA; telephone +82 42 860 5731;
 telefax +82 42 860 6836; e-mail <a href="mailto:htkim@utopia.etri.re.kr">htkim@utopia.etri.re.kr.</a> Key words:
 La1-xCaxMnO3 films, LTCMR, HTCMR, p-wave condensation, two-fold
 degeneracy of e_g orbitals. 75.50.Pp; 71.38.+i; 72.20.My.
<p>
 K. A. Kouznetsov, J. Borgmann, and John Clarke, "High-Tc Second-Order
 Gradiometer for Magnetocardiography in an Unshielded Environment."
 Submitted to Appl. Phys. Lett. Department of Physics, University of
 California, Berkeley, CA 94720; telephone (510) 642-3634; telefax (510)
 642-1304; e-mail <a href="mailto:kouznets@socrates.berkeley.edu">kouznets@socrates.berkeley.edu.</a> 85.25.Dq; 87.80.+s.
<p>
 Yijie Li and K. Tanabe, "Influence of Deposition Parameters on
 Superconductivity and Surface Morphology of NdBa2Cu3O7-d Films Grown by
 Pulsed Laser Deposition with a Single Crystal Target." To be published
 in Physica C. Superconductivity Research Laboratory, International
 Superconductivity Technology Center (ISTEC), 10-13 Shinonome 1-chome,
 Koto-ku, Tokyo 135, JAPAN; e-mail <a href="mailto:yjli@istec.or.jp">yjli@istec.or.jp.</a> Key words:
 NdBa2Cu3O7-d thin films, pulsed laser deposition, epitaxial growth,
 surface morphology, microstructure. 68.55.Jk; 73.50.-h; 74.76.Bz;
 81.15.Fg.
<p>
 H. K. Liu, A. Polyanskii, R. Zeng, P. Yao, V. Rouessac, and S. X. Dou,
 "Comparison of Ag/Bi-2223 Tapes Processed With and Without Hot-Pressing
 and Post-Annealing." To be published in the Proc. of the Int. Cryogenic
 Mater. Conf. (ICMC'99), Montreal, Quebec, Canada, July 12-16, 1999.
 Institute for Superconducting and Electronic Materials, University of
 Wollongong, NSW 2522, AUSTRALIA; telephone +61 2 4221 4547; telefax +61
 2 4221 5731; e-mail <a href="mailto:hua_liu@uow.edu.au">hua_liu@uow.edu.au.</a>
<p>
 H. K. Liu, R. Zeng, X. K. Fu, and S. X. Dou, "Phase Transformation and
 Liquid Phase Conversion During the Final Processing of Bi-2223/Ag PIT
 Tapes and Their Influence on Critical Current Density." To be published
 in Physica C. Institute for Superconducting and Electronic Materials,
 University of Wollongong, NSW 2522, AUSTRALIA; telephone +61 2 4221
 4547; telefax +61 2 4221 5731; e-mail <a href="mailto:hua_liu@uow.edu.au">hua_liu@uow.edu.au.</a> Key words:
 Bi-2223 tapes, phase transformation and decomposition, critical current
 density.
<p>
 T. Loefwander, G. Johansson, and G. Wendin, "Current-Voltage Relations
 in d-Wave Josephson Junctions: Effects of Midgap Interface States." To
 be published in J. Low Temp. Phys.: Proc. of the Int. Conf. on Phys.
 and Chem. of Molecular and Oxide Supercond. (MOS'99), Stockholm, Sweden,
 July 28-Aug. 2, 1999. Department of Microelectronics and Nanoscience,
 School of Physics and Engineering Physics, Chalmers University of
 Technology and Goeteborg University, S-41296 Goeteborg, SWEDEN; e-mail
 <a href="mailto:tfstomas@fy.chalmers.se">tfstomas@fy.chalmers.se;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9908261">http://xxx.lanl.gov/abs/cond-mat/9908261.</a> 74.50.+r.
<p>
 B. Maiorov, G. Nieva, and E. Osquiguil, "First Order Phase Transition of
 the Vortex Lattice In Twinned YBa2Cu3O7 Single Crystals in Tilted
 Magnetic Fields." Submitted to Phys. Rev. B. Comision Nacional de
 Energia Atomica, Centro Atomico Bariloche and Instituto Balseiro, 8400
 SC de Bariloche RN, ARGENTINA; e-mail <a href="mailto:maiorov@cab.cnea.gov.ar">maiorov@cab.cnea.gov.ar;</a> preprint
 also available at <a href="http://xxx.lanl.gov/abs/cond-mat/9908457">http://xxx.lanl.gov/abs/cond-mat/9908457.</a>
<p>
 J. Mannhart and H. Hilgenkamp, "Intrinsic Spatial Variations of the
 Symmetry Components of the Order Parameter in Superconducting Systems."
 Submitted to Europhys. Lett. Experimentalphysik VI, Center for
 Electronic Correlations and Magnetism, Institute of Physics, University
 of Augsburg, Universitaetsstr. 1, D-86135 Augsburg, GERMANY; telephone
 +49 821 598 3650; telefax +49 821 598 3652; e-mail
 <a href="mailto:jochen.mannhart@physik.uni-augsburg.de">jochen.mannhart@physik.uni-augsburg.de.</a> 74.72.-h; 74.50.+r; 74.80.Dm.
<p>
 P. N. Mikheenko, B. Zeimetz, and S. X. Dou, "Surface Barrier Controlled
 Order-Disorder Transition in Bi2223/Ag Tapes." To be published in
 Physica C. School of Physics and Astronomy, University of Birmingham,
 Edgbaston, Birmingham B15 2TT, UNITED KINGDOM; telephone +44 121 414
 7322; telefax +44 121 414 4719; e-mail <a href="mailto:p.mikheenko@bham.ac.uk">p.mikheenko@bham.ac.uk.</a> Key
 words: surface barrier, magnetization, critical current density,
 pinning, order-disorder transition, Bi2223/Ag tape. 74.80.Dm; 74.60.Jg;
 74.62.Dh; 74.60.Ge; 74.72.Hs.
<p>
 R. G. Mints and E. H. Brandt, "Buckling Instability in Type-II
 Superconductors with Strong Pinning." School of Physics and Astronomy,
 Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv
 University, Tel Aviv 69978, ISRAEL. 74.60.Ec; 74.60.Ge.
<p>
 Niels Asger Mortensen, Antti-Pekka Jauho, and Karsten Flensberg,
 "Modeling of Dephasing in Semiconductor-Superconductor
 Heterostructures." Submitted to Phys. Rev. B. Mikroelektronik Centret,
 Bldg. 345 East, Technical University of Denmark, DK-2800 Lyngby,
 DENMARK; telephone +45 4525 5782; e-mail <a href="mailto:nam@mic.dtu.dk">nam@mic.dtu.dk;</a> preprint also
 available at <a href="http://xxx.lanl.gov/abs/cond-mat/9909029">http://xxx.lanl.gov/abs/cond-mat/9909029.</a> 05.60.Gg;
 72.10.-d; 74.50.+r; 74.80.Fp.
<p>
 V. N. Narozhnyi, D. Eckert, G. Fuchs, K. Nenkov, T. G. Uvarova, and K.-
 H. Mueller, "Magnetic Properties of Gd1-xPrxBa2Cu3O7-y Single Crystals."
 To be published in Physica B: Proc. of the 22nd Int. Conf. on Low Temp.
 Phys. (LT22), Helsinki, Finland, Aug. 5-11, 1999. Institut fuer
 Festkoerper- und Werkstofforschung Dresden e.V., Abt. 21, Postfach
 270016, D-01171 Dresden, GERMANY; telephone +49 351 465 9563; telefax
 +49 351 465 9537; e-mail <a href="mailto:narozh@ifw-dresden.de">narozh@ifw-dresden.de;</a> preprint also available
 at <a href="http://xxx.lanl.gov/abs/cond-mat/9909110">http://xxx.lanl.gov/abs/cond-mat/9909110.</a> Key words: Gd1-
 xPrxBa2Cu3O7-y, PrBa3Cu3O7-y, magnetic anisotropy, antiferromagnetism.
<p>
 V. N. Narozhnyi, D. Eckert, K. A. Nenkov, G. Fuchs, K.-H. Mueller, and
 T. G. Uvarova, "PrBa2Cu3O7-y: Superconducting or Anomalously Magnetic?"
 To be published in Int. J. Mod. Phys. B: Proc. of the Second Int. Conf.
 on New Theories, Discoveries and Applications of Superconductors and
 Related Materials (New3SC-2), Las Vegas, Nev., May 31-June 4, 1999.
 Institut fuer Festkoerper- und Werkstofforschung Dresden e.V., Abt. 21,
 Postfach 270016, D-01171 Dresden, GERMANY; telephone +49 351 465 9563;
 telefax +49 351 465 9537; e-mail <a href="mailto:narozh@ifw-dresden.de">narozh@ifw-dresden.de;</a> preprint also
 available at <a href="http://xxx.lanl.gov/abs/cond-mat/9909107">http://xxx.lanl.gov/abs/cond-mat/9909107.</a>
<p>
 S. Ostertun, J. Kiltz, T. Wolf, and A. Bock, "Resonant Raman Study of
 Superconducting Gap and Electron-Phonon Coupling in YbBa2Cu3O7-d." To
 be published in J. Low Temp. Phys.: Proc. of the Int. Conf. on Phys.
 and Chem. of Molecular and Oxide Supercond. (MOS'99), Stockholm, Sweden,
 July 28-Aug. 2, 1999. Institut fuer Angewandte Physik und Zentrum fuer
 Mikrostrukturforschung, Universitaet Hamburg, Jungiusstrasse 11, D-20355
 Hamburg, GERMANY; telephone +49 40 42838 6535; telefax +49 40 428 38
 4368; e-mail <a href="mailto:ostertun@physnet.uni-hamburg.de">ostertun@physnet.uni-hamburg.de;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9908273">http://xxx.lanl.gov/abs/cond-mat/9908273.</a> 74.25.Gz; 74.25.Kc; 74.62.Dh;
 74.72.Bk; 78.30.Er.
<p>
 D. Pal and B. Basu, "Topological Approach to Pairing Mechanism of High-
 Tc Superconductivity." Physics and Applied Mathematics Unit, Indian
 Statistical Institute, Calcutta 700035, INDIA; e-mail
 <a href="mailto:res9719@www.isical.ac.in">res9719@www.isical.ac.in;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9908140">http://xxx.lanl.gov/abs/cond-mat/9908140.</a>
<p>
 J. J. Palacios, "Metastability and Paramagnetism in Superconducting
 Mesoscopic Disks." Departamento de Fisica Teorica de la Materia
 Condensada, Universidad Autonoma de Madrid, Cantoblanco, E-28049 Madrid,
 SPAIN; e-mail <a href="mailto:palacios@kim.fmc.uam.es">palacios@kim.fmc.uam.es;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9908341">http://xxx.lanl.gov/abs/cond-mat/9908341.</a> 74.60.Ec; 74.76.-w.
<p>
 Jason K. Perry, "The Importance of Static Correlation in the Band
 Structure of High Temperature Superconductors." To be published in J.
 Phys. Chem. First Principles Research, Inc., 8391 Beverly Blvd., Suite
 #171, Los Angeles, CA 90048; telephone (323) 465-9572; telefax (323)
 465-2805; e-mail <a href="mailto:jkp@firstprinciples.com">jkp@firstprinciples.com;</a> Web site
 <a href="http://www.firstprinciples.com">http://www.firstprinciples.com;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9903088">http://xxx.lanl.gov/abs/cond-mat/9903088.</a>
<p>
 Jason K. Perry and Jamil Tahir-Kheli, "The ARPES Pseudogap and Anomalous
 Background of Underdoped Bi2Sr2CaCu2O8+d as Evidence for a Fermi Level
 Band Crossing." Submitted to Phys. Rev. Lett. First Principles
 Research, Inc., 8391 Beverly Blvd., Suite #171, Los Angeles, CA 90048;
 telephone (323) 465-9572; telefax (323) 465-2805; e-mail
 <a href="mailto:jkp@firstprinciples.com">jkp@firstprinciples.com;</a> Web site <a href="http://www.firstprinciples.com">http://www.firstprinciples.com;</a>
 preprint also available at <a href="http://xxx.lanl.gov/abs/cond-mat/9908308">http://xxx.lanl.gov/abs/cond-mat/9908308.</a>
<p>
 Jason K. Perry and Jamil Tahir-Kheli, "Electron Correlation and the c-
 Axis Dispersion of Cu d_[3z^2_r^2: a New Band Structure for High
 Temperature Superconductors." Submitted to Phys. Rev. Lett. First
 Principles Research, Inc., 8391 Beverly Blvd., Suite #171, Los Angeles,
 CA 90048; telephone (323) 465-9572; telefax (323) 465-2805; e-mail
 <a href="mailto:jkp@firstprinciples.com">jkp@firstprinciples.com;</a> Web site <a href="http://www.firstprinciples.com">http://www.firstprinciples.com;</a>
 preprint also available at <a href="http://xxx.lanl.gov/abs/cond-mat/9907332">http://xxx.lanl.gov/abs/cond-mat/9907332.</a>
<p>
 D. M. Potrepka, J. I. Budnick, D. B. Fenner, W. A. Hines, M.
 Balasubramanian, and A. R. Moodenbaugh, "Role of Bromine in Restoring
 Superconductivity in YBa2Cu3Oy." Submitted to Phys Rev. B. U.S. Army
 Research Laboratory, AMSRL-SE-RE, 2800 Powder Mill Road, Adelphi, MD
 20783-1197. 74.72.Bk.
<p>
 F. Rullier-Albenque, P. A. Vieillefond, H. Alloul, A. W. Tyler, P.
 Lejay, and J. F. Marucco, "Universal Tc Depression by Irradiation
 Defects in Underdoped and Overdoped Cuprates." Laboratoire des Solides
 Irradies, CEA, CNRS UMR 7642, Ecole Polytechnique, F-91128 Palaiseau
 Cedex, FRANCE; telephone +33 1 6933 4506; telefax +33 1 6933 3022; e-
 mail <a href="mailto:florence.albenque@polytechnique.fr">florence.albenque@polytechnique.fr;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9908405">http://xxx.lanl.gov/abs/cond-mat/9908405.</a> 74.62.Dh; 74.25.Fy; 74.72.-h.
<p>
 P.V.P.S.S. Sastry, Y. Li, J. Su, K. W. Hamill, M. Chatard, and J.
 Schwartz, "Effect of Silver Interface on the Formation and Stability of
 HgPb1223 Superconductors." To be published in Adv. Cryo. Eng. National
 High Magnetic Field Laboratory, Florida State University, 1800 East Paul
 Dirac Drive, Tallahassee, FL 32310; telephone (850) 644-1447; telefax
 (850) 644-0867; e-mail <a href="mailto:pamidi@magnet.fsu.edu">pamidi@magnet.fsu.edu.</a>
<p>
 D. J. Scalapino, "Superconductivity and Spin Fluctuations." Presented
 at the Int. Conf. on Phys. and Chem. of Molecular and Oxide Supercond.
 (MOS'99), Stockholm, Sweden, July 28-Aug. 2, 1999. Department of
 Physics, University of California, Santa Barbara, CA 93106-9530; e-mail
 <a href="mailto:djs@spock.physics.ucsb.edu">djs@spock.physics.ucsb.edu;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9908287">http://xxx.lanl.gov/abs/cond-mat/9908287.</a>
<p>
 Robert A. Smith, Beccy S. Handy, and Vinay Ambegaokar, "The Upper
 Critical Field in Disordered Two-Dimensional Superconductors." School
 of Physics and Astronomy, University of Birmingham, Edgbaston,
 Birmingham B15 2TT, UNITED KINGDOM; e-mail <a href="mailto:ras@th.ph.bham.ac.uk">ras@th.ph.bham.ac.uk;</a>
 preprint also available at <a href="http://xxx.lanl.gov/abs/cond-mat/9908427">http://xxx.lanl.gov/abs/cond-mat/9908427.</a>
<p>
 H. Suematsu, M. Kawano, T. Onda, T. Akao, M. Hayakawa, H. Ogiwara, M.
 Karppinen, and H. Yamauchi, "Peak Effect in Critical Current Density
 Induced by Oxygen Non-Stoichiometry in Cation-Stoichiometric SmBa2Cu3O7-
 d Superconductor." To be published in Physica C. Contact H. Yamauchi,
 Materials & Structures Laboratory, Tokyo Institute of Technology, 4259
 Nagatsuta, Midori-ku, Yokohama 227, JAPAN; telephone +81 45 924-5315;
 telefax +81 45 924-5365 or -5360; e-mail <a href="mailto:yamauchi@materia.titech.ac.jp">yamauchi@materia.titech.ac.jp.</a>
 Key words: Sm-123, peak effect, oxygen deficiency, coulometric
 titration method, pinning center.
<p>
 Jamil Tahir-Kheli, "The NMR of High Temperature Superconductors Without
 Anti-Ferromagnetic Spin Fluctuations." To be published in J. Phys.
 Chem. First Principles Research, Inc., 8391 Beverly Blvd., Suite #171,
 Los Angeles, CA 90048; preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9903105">http://xxx.lanl.gov/abs/cond-mat/9903105.</a>
<p>
 S. Toenies, C. Klein, H. W. Weber, B. Zeimetz, Y. C. Guo, S. X. Dou, R.
 Sawh, Y. Ren, and R. Weinstein, "Radiation Induced Enhancement of
 Critical Currents in Uranium-Doped Bi2Sr2Ca2Cu3Ox Tapes." Submitted to
 the Proc. of the Fourth European Conf. on Appl. Supercond. (EUCAS'99),
 Barcelona, Spain, Sept. 14-17, 1999. Atomic Institute of the Austrian
 Universities, A-1020 Vienna, AUSTRIA; e-mail <a href="mailto:stoenies@ati.ac.at">stoenies@ati.ac.at.</a>
<p>
 H. Wilhelm, S. Raymond, D. Jaccard, O. Stockert, and H. V. Loehneysen,
 "From an Antiferromagnet to a Heavy-Fermion System: CeCu5Au Under
 Pressure." Departement de Physique de la Matiere Condensee, Universite
 de Geneve, 24 quai Ernest-Ansermet, CH-1211 Geneva 4, SWITZERLAND;
 telephone +41 22 702 6261; telefax +41 22 702 6869; e-mail
 <a href="mailto:heribert.wilhelm@physics.unige.ch">heribert.wilhelm@physics.unige.ch;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9908442">http://xxx.lanl.gov/abs/cond-mat/9908442.</a> Key words: phase transition,
 high pressure, electrical resistivity, non-Fermi-liquid.
<p>
 Y. Yeshurun, A. Shaulov, and D. Giller, "Local Magnetic Characterization
 of Superconductors Based on Magneto-Optics and Hall-Probe Array
 Techniques." Presented at the conference on Frontiers in Magnetism
 (FIM99), Stockholm, Sweden, August 12-15, 1999. Institute of
 Superconductivity, Department of Physics, Bar-Ilan University, Ramat Gan
 52900, ISRAEL; D. Giller's e-mail <a href="mailto:giller@mail.biu.ac.il">giller@mail.biu.ac.il.</a> Key words:
 high-temperature superconductors, vortex phases, local magnetic
 measurements, Hall-probe array, magneto-optics.
<p>
 J. Zaanen, "Order-Out-of-Disorder in a Gas of Elastic Quantum Strings in
 2+1 Dimensions." Instituut-Lorentz for Theoretical Physics, Leiden
 University, P.O. Box 9506, NL-2300 RA Leiden, The Netherlands; e-mail
 <a href="mailto:jan@lorentz.leidenuniv.nl">jan@lorentz.leidenuniv.nl;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9909106">http://xxx.lanl.gov/abs/cond-mat/9909106.</a> 64.60.-i; 71.27.+a; 74.72.-h;
 75.10.-b.
<p>
 Igor Zutic and A. Das Sarma, "Spin-Polarized Transport and Andreev
 Reflection in Semiconductor/Superconductor Hybrid Structures."
 Submitted to Phys. Rev. B. Department of Physics, University of
 Maryland at College Park, College Park, MD 20742-4111; e-mail
 <a href="mailto:igor@cooperon.umd.edu">igor@cooperon.umd.edu;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9909002">http://xxx.lanl.gov/abs/cond-mat/9909002.</a> Key words: Andreev
 reflection, spin polarization, differential conductance. 73.40.Gk;
 74.80.Fp; 85.90.+h.
 <hr>
<p>
 COMING EVENTS
 (An * indicates a previously listed event. Also see complete listing of
 upcoming conferences and workshops at our Web site
 <a href="http://www.iitap.iastate.edu/htcu/comevents.html.)">http://www.iitap.iastate.edu/htcu/comevents.html.)</a>
<p>
 Jan. 10 - 14, 2000: Winter School in Superconductivity, IRC, University
 of Cambridge. Intended as an introduction to high- and low-temperature
 superconductivity for new research students in physics, chemistry,
 materials science, and engineering, and others who may be interested.
 About five lectures a day plus demonstrations and research seminars.
 The lectures will cover the following topics: fundamental physical
 properties, chemistry and structure, experimental techniques, flux
 lines, type-II behavior and heavy current applications materials,
 superconducting electronics, and industrial view of applications.
 Accommodation and meals will be free to EPSRC students. For further
 information, contact Alicia Kelleher, IRC Secretary, IRC in
 Superconductivity, University of Cambridge, Cavendish Laboratory,
 Madingley Road, Cambridge CB3 OHE, United Kingdom; e-mail
 <a href="mailto:apk21@cam.ac.uk">apk21@cam.ac.uk.</a> Information also available at Web site
 www.sucon.cam.ac.uk.
<p>
 *March 31 - April 10, 2000: Conference on Major Trends in
 Superconductivity in the New Millennium (MTSC 2000) and Symposium on
 Itinerant and Localized States in HTSC (SILS), Klosters, Kanton
 Graubuenden, Switzerland. Scope of MTSC 2000 is on recent developments
 and trends in new superconducting systems with emphasis on experiments
 and theories which are relevant to the pairing mechanism. Besides the
 superconducting cuprates, conventional superconductors, organic systems,
 borocarbides, ruthenates, nanostructures, and fullerenes will be
 addressed. In order to raise the awareness for novel ideas and results
 in this rapidly growing field, the physics and chemistry of related
 materials will be included. Special emphasis on phenomena related to
 nanoscale phase separation and charge modulation. Symposium on
 Itinerant and Localized States in HTSC (SILS) will focus on large and
 small polaron and bipolaron effects in high-Tc materials with special
 emphasis on their preparative properties. MTSC 2000 is organized in
 close analogy to the Gordon conferences. Limited number of slots for
 posters. Total number of participants limited to 130 persons.
 Proceedings will be published in a special issue of Journal of
 Superconductivity. Abstract and pre-registration deadline, November 15,
 1999. For more information, contact Annette Bussmann-Holder, Max-
 Planck-Institut fuer Festkoerperforschung, Heisenbergstr. 1, D-70569
 Stuttgart, Germany; telephone +49 711 689 1679; telefax +49 711 689
 1091. Or contact Vladimir Z. Kresin, Lawrence Berkeley Laboratory,
 University of California, 1 Cyclotron Road, Berkeley CA 94720; telephone
 (510) 486-6951; telefax (510) 486-5401. Information also available at
 Web site <a href="http://www.mpi-stuttgart.mpg.de/CONF/mtsc2000.html">http://www.mpi-stuttgart.mpg.de/CONF/mtsc2000.html.</a>
<p>
 June 18 - 23, 2000: European Conference on Energy Dispersive X-Ray
 Spectrometry (EDXRS 2000), Krakow, Poland. Aim of the conference is to
 bring together scientists working either in basic research in x-ray
 spectrometry, detectors and sources, or involved in applications of x-
 ray spectrometry or some of the related experimental techniques. Main
 topics: interaction of photons and particles with matter and modeling;
 new developments in instrumentation (instruments utilizing polarized
 radiation, synchrotron radiation and other x-ray sources, grazing angle
 spectrometers, portable instruments); energy dispersive x-ray detectors
 (cryo-detectors, low-Z detectors, Peltier-cooled detectors, dedicated
 pulse processing); quantitation and data handling (sample preparation,
 quality control and quality assurance, simulation, modeling, software);
 x-ray optics (capillaries, mirrors, multilayers, TXRF, imaging);
 microanalysis and elemental mapping (micro-XRF, micro-PIXE, EPMA); and
 x-ray spectrometry applications in life and environmental sciences,
 earth sciences, art and cultural heritage, material sciences, and
 industry. Pre-registration deadline, November 15, 1999; abstract
 deadline, March 1, 2000. The official language of the Conference is
 English. For information, contact EDXRS-2000 Secretariat, Faculty of
 Physics and Nuclear Techniques, University of Mining and Metallurgy, Al.
 Mickiewicza 30, 30-059 Krakow, Poland; telefax +48 12 6340010; Web site
 <a href="http://www.ftj.agh.edu.pl/wfitj/conf/edxrs/">http://www.ftj.agh.edu.pl/wfitj/conf/edxrs/.</a>
 <hr>
<p>
 RESOURCES
<p>
 Information
<p>
 Proceedings: Physics and Materials Science of Vortex States, Flux
 Pinning and Dynamics -- Proceedings of the NATO Advanced Study
 Institute, Kusadasi, Turkey, July 26 - August 8, 1998, edited by Ram
 Kossowsky, Shyamalendu Bose, Vladimir Pan, and Zafer Durusoy. NATO
 Science Series: Applied Sciences, Volume 356. Discussion by an
 assembly of expert physicists and materials scientists embracing the
 specific features of vortex-pin interactions, modes of different kinds
 of vortex motion under the action of Lorenz force, and mechanisms of
 dissipation. Implications for the development of new devices and
 components in electrical engineering, modern electronics, computer
 technology, and microwave communication. Publ. 1999; 788 pp.; price
 $357 (HB) or $117 (PB); ISBN 0-7923-5663-2 (HB) or ISBN 0-7923-5664-0
 (PB). For information, contact Kluwer Academic Publishers, Customer
 Service Department, P.O. Box 358, Accord Station, Hingham, MA 02018-
 0358; telephone (781) 871-6600; telefax (781) 681-9045; e-mail
 <a href="mailto:kluwer@wkap.com">kluwer@wkap.com.</a> Outside North and South America, contact Kluwer
 Academic Publishers, Customer Service Department, P.O. Box 989, 3300 AZ
 Dordrecht, The Netherlands; telephone +31 78 639 23 92; telefax +31 78
 639 22 54; e-mail <a href="mailto:services@wkap.nl">services@wkap.nl.</a>
 <hr>
<p>
 FYI
 (High-Tc Update takes no responsibility for want ads listed in this
 section.)
<p>
 Positions open: Two positions are available at the Institute of Solid
 State and Materials Research in Dresden, Germany. The researcher or
 postdoctoral position requires a Ph.D. or related degree in solid-state
 chemistry or solid-state or materials physics and experience in
 crystallization from liquid phase. The Ph.D. student position requires
 a degree in chemistry, physics, mineralogy/crystallography, or materials
 engineering. For information, contact Prof. G. Krabbes, Institute fuer
 Festkoerper- und Werkstofforschung (IFW), Postfach 270016, D-01171
 Dresden, Germany; telephone +49 351 4659 410; telefax +49 351 4659 480;
 e-mail <a href="mailto:g.krabbes@ifw-dresden.de">g.krabbes@ifw-dresden.de.</a>
<p>
 Engineers/Scientists needed for development and process optimization of
 powder-in-tube (PIT) Bi-2223 tapes. Nordic Superconductor Technologies
 (NST), the first company in Europe entirely focusing on developing,
 producing, and selling high-temperature superconducting tapes for the
 global market, has openings for the following positions:
 R&D Engineer: Education - Ph.D. in electrical engineering, physics, or
 materials science and 2-5 years R&D experience in superconducting
 materials for electrical applications. Knowledge of materials
 requirement for various applications such as electrical cables, motors,
 and magnets. Industrial manufacturing experience a plus. Working area:
 R&D work on low-ac-loss HTS tapes or wires, alternative wire geometries,
 filament insulation, and twisting.
 R&D Engineer: Education - Ph.D. in ceramic engineering, chemical
 engineering, or materials science and 1-3 years industrial or research
 experience in advanced ceramic materials processing. Experience with
 Bi-superconductors and industrial manufacturing a plus. Working area:
 R&D work on optimizing the heat treatment of Bi-2223 in PIT tapes, and
 improvements of flux pinning by inclusions/substitutions.
 R&D Engineer: Education - M.Sc. in mechanical engineering and 1-3 years
 industrial machine design experience. Metal forming industry
 experiences a plus. Working area: R&D work on optimizing the
 mechanical deformation of PIT tapes, develop twisting and stranding
 equipment, develop mechanical deformation equipment for alternative wire
 geometries, and general support in mechanical design. Please send your
 written application to Per Vase, Vice President Engineering, Nordic
 Superconductor Technologies A/S, Priorparken 685, 2605 Brondby, Denmark;
 telephone +45 4348 3592; telefax +45 4348 2501; e-mail <a href="mailto:p.vase@nst.com">p.vase@nst.com</a>
 (subject -- job opportunity); Web site <a href="http://www.nst.com">http://www.nst.com.</a>
<p>
 The Advanced Devices & Systems Group (ADS) at IGC is seeking an
 innovative scientist/engineer to be responsible for setting up systems
 for thin-film-deposition by techniques such as electron beam
 evaporation, ion-beam-assisted deposition, pulsed laser deposition, and
 chemical vapor deposition for manufacturing scale-up, operating such
 systems, quality control, process optimization, and film
 characterization. The candidate will play a critical role in the design
 review and project planning processes to implement cost, design,
 assembly, and advanced development procedures with senior engineering
 staff and management. Additional responsibilities include expediting
 delivery of vendor purchased parts; select engineering components with
 cost and milestone schedules to ensure project and budgetary goals.
 Qualifications -- B.S. or M.S. in materials, electrical or mechanical
 engineering, and 2 - 5 years experience in vacuum systems and thin-film
 deposition. Experience in deposition of oxides, especially high-
 temperature superconductors and in web coating, large-area deposition,
 and thin-film manufacturing are preferred. Excellent interpersonal and
 written communications skills are required to prepare presentations,
 proposals, budgets and schedules; ability to work effectively with
 engineering, hourly employees, vendors, customers and management are
 key. Proficiency in spreadsheets, schedulers, and databases are
 required. For information, contact T. Lehner, Technology
 Development/ADS, Intermagnetics General Corporation, 450 Old Niskayuna
 Road, Latham, NY 12110-0461; e-mail <a href="mailto:tlehner@igc.com">tlehner@igc.com.</a>
<p>
 <hr>
<p>
 High-Tc Update is the high-Tc superconductivity information exchange
 newsletter. Please send 1) preprints, reprints, and other research
 reports; 2) descriptions of on-going work; 3) meeting announcements and
 summaries.
<p>
 The information contained herein is intended for limited distribution.
 Readers are expected to respect the rights of the authors.
<p>
 Please address all contributions and inquiries to:
 Dr. Sreeparna Mitra, A219 Physics
 Ames Laboratory/Iowa State University
 Ames, Iowa 50011-3020
 Telephone: (515) 294-3877 Telefax: (515) 294-1134
 E-mail: <a href="mailto:MITRA@AMESLAB.GOV">MITRA@AMESLAB.GOV</a> or <a href="mailto:MITRA@IASTATE.EDU">MITRA@IASTATE.EDU</a>
<p>
 Project Director/Editor: Sreeparna Mitra
 Science Editor: John R. Clem
 High-Tc Update, Vol. 13, #19, October 1, 1999.
 <hr>