HIGH-Tc UPDATE E-MAIL VERSION, VOL. 14, NO. 5, March 1, 2000.
<p>
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 organizations, and individuals.
 <hr>
<p>
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<p>
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<p>
 PLEASE NOTE: Issues of High-Tc Update can be sent as an e-mail
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<p>
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<p>
 PLEASE READ: The electronic-mail version of High-Tc Update is generated
 from a Macintosh Microsoft Word file and turned into a text file that
 can be transferred electronically. Formatting commands, Greek symbols,
 diacritical marks, etc. are lost in this transformation. In order to
 improve the readability of the e-mail version, the newsletter staff add
 explanatory marks as needed to the text file. For example, a carat
 (10^5) indicates a superscript (ten to the fifth). A carat followed by
 a bracket (cm^[-2]) indicates everything within the brackets is
 superscripted (centimeter to the minus 2). A bracket followed by a
 carat ([18]^O) indicates everything before the carat is superscripted.
 An underline (M_i) indicates a subscript (M subscript i). Most Greek
 letters are spelled out (Delta, mu, tau, pi, Omega), although delta is
 left as "d." In most instances, easily recognizable formulas or units
 are left as they appear: Tc, Jc, YBa2Cu3O7, O2. Mu-m is changed to
 micrometers. Diacritical marks (accents, tildes, carats, etc.) are
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 <hr>
<p>
 NOTA BENE:
<p>
 Ru-1212
<p>
 RuSr2GdCu2O8 (Ru-1212) is currently of considerable interest because
 of recent reports of coexistence of ferromagnetism and bulk
 superconductivity in this material. A preprint by J. W. Lynn (NIST-
 Gaithersburg) et al. describes the results of a neutron-diffraction
 study of the magnetic order in Ru-1212. The authors found that the Ru
 moments order antiferromagnetically at T_N = 136(2) K, coincident with
 the temperature previously reported as the onset of ferromagnetism.
 Neighboring spins were found to be antiparallel in all three directions
 of the simple tetragonal Ru lattice, with a low-temperature moment of
 1.18(6) mu_B along the c axis. The measurements put an upper limit of
 ~0.1 mu_B for any net zero-field moment, with fields exceeding 0.4 T
 needed to induce a measurable magnetization. The neutron data therefore
 do not reveal any ferromagnetic component associated with the Ru
 ordering. The Gd ions (with the expected moment of 7 mu_B at the body-
 centered positions of the Ru lattice) order independently at T_N =
 2.50(2) K with the same antiferromagnetic structure as the Ru.
<p>
<p>
 RBa2Cu3O7-d
<p>
 According to a preprint by T. Xiang (Beijing) and W. N. Hardy (UBC), the
 anisotropy in the temperature dependence of the in-plane and c-axis
 conductivities of high-Tc cuprates in the superconducting state is
 consistent with a strong in-plane momentum dependence of both the
 quasiparticle scattering rate and the interlayer hopping integral. The
 authors applied the cold-spot scattering model proposed by L. B. Ioffe
 and A. J. Millis [Phys. Rev. B 58, 11631 (1998)] to the superconducting
 state and found that the c-axis microwave conductivity sigma_c varies
 approximately as T^3 in an intermediate temperature regime, in good
 agreement with experimental results for optimally doped YBa2Cu3O7-d.
<p>
 A [63]^Cu NMR study of YBa2(Cu0.99Zn0.01)3O6.7 has been carried out by
 M.-H. Julien (Grenoble and St. Martin d'Heres) et al. Doping the YBCO
 with nonmagnetic Zn impurities produces a considerable broadening of the
 [63]^Cu NMR spectra and leads to an increase of low-energy magnetic
 fluctuations detected in [63]^Cu spin-lattice relaxation measurements.
 Using a model-independent analysis, the authors conclude that these
 effects are due to the development of staggered magnetic moments on many
 Cu sites around each Zn atom, and that the Zn-induced moment in the bulk
 susceptibility might be explained by this staggered magnetization.
<p>
 The complex surface impedance of a number of GdBa2Cu3O7-d single
 crystals has been measured at 10, 15, and 21 GHz by R. J. Ormeno et al.
 (Birmingham) using a cavity-perturbation technique. In measurements at
 low temperatures, the authors observed a marked increase in the
 effective penetration depth and surface resistance associated with the
 paramagnetic and antiferromagnetic alignment of the Gd spins. The
 effective penetration depth has a sharp change in slope at the Neel
 temperature T_N ~~ 2.25 K, and the surface resistance peaks at a
 frequency-dependent temperature below 3 K.
<p>
 The x-ray standing-wave technique has been used by A. Kazimirov
 (Northwestern) et al. to study the lattice location of rare-earth atoms
 in thin films of RBa2Cu3O7-d (R = Gd, Pr). The films had a thickness of
 200 nm and were grown by pulsed-laser deposition (PLD) on SrTiO3 (001)
 substrates. The standing wave was generated by kinematic Bragg
 diffraction. Analysis of the angular dependence leads to information on
 the degree of site interchange of R and Ba. The authors found a clear
 indication of Pr substitution for Ba.
<p>
<p>
 Bi Cuprates
<p>
 As noted in a preprint by S. Lupi (Roma) et al., an optical pseudogap
 has been assumed to open at low T in the anomalous Drude absorption,
 which models the optical conductivity sigma(omega) proportional to
 omega^[-1] of high-Tc superconductors by a linewidth Gamma ~~ 10^3 cm^[-
 1] varying with omega. Instead, the authors observed in measurements of
 sigma(omega) of Bi2Sr2CuO6 (Bi-2201) down to 10 cm^[-1]: (a) a normal
 Drude term with Gamma = 35 cm^[-1] at 30 K, in good agreement with
 transport data, and (b) a strong band peaked in the far infrared (FIR),
 likely due to bound charges, whose tail exhibits the omega^[-1]
 dependence. As the FIR peak softens for T --> 0, it opens a pseudogap-
 like depression in sigma(omega) following ordinary sum rules.
<p>
 The variation of Tc with hole concentration p in the La-doped Bi-2201
 system Bi2Sr2-xLaxCuO6+d has been investigated by M.-Y. Choi and J. S.
 Kim (Sungkyunkwan). The authors found that while Tc vs p in the Bi-2201
 system does not follow the systematics found in many other high-Tc
 cuprates, it does resemble the behavior found in Zn-doped cuprates.
 However, the authors suggest that the strong scatterer in the Bi-2201
 system is a vacancy on the Cu site, contrary to the behavior in the Zn-
 doped cuprates.
<p>
 Two experimental approaches to circumvent the problem of self-heating in
 current-voltage (I-V) measurements on small mesa samples of
 Bi2Sr2CaCu2O8+d (Bi-2212) are described in a preprint by P. J. Thomas et
 al. (Birmingham). The authors made simultaneous dc and temperature
 measurements, which allowed corrections for heating to be made. The
 authors also made short-pulse measurements, where the I-V
 characteristics and the mesa temperatures could be measured on a
 microsecond time scale. These measurements made it possible to derive
 intrinsic I-V characteristics, even in the presence of appreciable self-
 heating. Self-heating leads to a significant depression of the apparent
 energy gap, and accounts, in major part, for the S-shaped
 characteristics often reported at high currents.
<p>
 Using bulk samples, H. Fujii (NRIM) et al. investigated the stable
 region of the Ca2PbO4 impurity phase in Bi2-xPbxSr2CaCu2O8+d [(Bi,Pb)-
 2212]/Ag tapes as a function of oxygen partial pressure and temperature.
 Following these studies, the authors prepared (Bi,Pb)-2212 tapes by
 applying rapid cooling. The authors found that rapid cooling is
 effective in increasing the critical current density Jc and improving
 the coupling of grains. The improvements are due to the reduction in
 the segregation of Ca2PbO4 at the (Bi,Pb)-2212 grain boundaries.
<p>
 A mathematical model has been developed by J. Pitel et al. (Bratislava)
 to predict the critical currents in Bi-2223 Ag-sheathed tapes consisting
 of two groups of filaments with orthogonal c-axis texture (i.e.,
 filaments oriented either parallel or perpendicular to the tape
 surface). Taking into account the anisotropy of Jc(B,theta), where
 theta is the angle of the magnetic flux density B relative to the c axis
 of the filaments, the authors were able to calculate the anisotropy
 (field-angle dependence) of the overall critical current density I_c(B)
 of the tape. The calculations revealed that the anisotropy in I_c(B)
 could be significantly reduced, but only at the price of a simultaneous
 decrease in the current-carrying capacity of the tape.
<p>
 A dip-coating-then-stacking (DIS) process, which is simpler and easier
 than the oxide-powder-in-tube (OPIT) process, has been developed by Y.
 S. Sung et al. (NRIM) to fabricate Bi2Sr2Ca2Cu3O10+d [(Bi,Pb)-2223]
 conductors. In the DIS process, multi-core tapes were prepared by
 stacking several layers of single-side dip-coated Ag strips and then
 wrapping them with Ag foil. After burning at 500^oC to remove organic
 materials, the tapes were rolled to increase the packing density of the
 oxide core, and then were heat-treated twice at 838^oC in air with an
 intermediate pressing. The resulting tapes had transport critical
 currents of I_c ~ 73 A and transport critical current densities of Jc ~
 1.8 x 10^4 A/cm^2 at 77 K and 0 T. Considering the simplicity of the
 DIS process relative to the OPIT process and the respectable values of
 I_c and Jc already achieved, the authors suggest that the DIS process is
 a promising alternative to OPIT for fabricating multi-core (Bi,Pb)-2223
 tape conductors.
<p>
<p>
 Films
<p>
 Chemical-solution-deposition (CSD) processing for the deposition of
 YBa2Cu3O7-d (Y-123) on biaxially textured substrates shows promise as a
 low-cost technique for the fabrication of superconducting tapes without
 the need for high-vacuum apparatus. A preprint by K. Yamagiwa (SRL-
 ISTEC) et al. reports success in preparing in-plane-aligned Y-123 films
 by CSD processing on CeO2-buffered MgO substrates. The CeO2 (100)
 buffer films were deposited on MgO (100) single-crystalline substrates
 by pulsed-laser deposition (PLD). For CSD coating, a homogeneous
 coating solution having a molar ratio of Y:Ba:Cu = 1:2:3 was prepared by
 dissolving metal naphthenates in toluene. This solution was spin-coated
 on the CeO2-buffered MgO substrate. The precursor films were calcined
 at 425^oC and then fired at various temperatures under low oxygen
 pressure. All Y-123 films showed strong (00n) x-ray peaks, indicating
 c-axis orientation perpendicular to the substrates and in-plane-aligned
 a/b axes. The zero-resistance Tc of an Y-123 film was 91.5 K, and Jc
 was 1.2 x 10^5 A/cm^2 at 77 K and 0 T. Y-123 films similarly deposited
 on YSZ (yttria-stabilized zirconia) (100) single-crystalline substrates,
 however, reacted with the substrate (forming the BaZrO3 phase) and did
 not show satisfactory superconducting properties.
<p>
 A preprint by J. Xu et al. (Chengdu) reports the preparation of highly
 c-axis-oriented Y-123 films on LaAlO3 (100) substrates by a self-
 template technique. The films had Tc >= 90 K, Delta[Tc]<= 1 K, and
 surface resistance R_s(77 K, 10 GHz) ~ 500 micro-ohms. The best sample
 had an R_s of 330 micro-ohms at 77 K and 10 GHz. The self-template
 method is a two-step process: First, an initial Y-123 layer is grown at
 a high substrate temperature T_s in a three-target dc magnetron
 sputtering system. Then, after T_s is quickly lowered by 20-50^oC, a
 second Y-123 layer is grown epitaxially on the first one, up to a total
 thickness of about 400 nm.
<p>
 The oxygenation of thin, epitaxial c-axis-oriented RBa2Cu3O7-d films
 deposited on closely matched substrates has been studied by A.
 Kursumovic (IRC-Cambridge) et al.: YBa2Cu3O7-d on SrTiO3 and
 GdBa2Cu3O7-d on NdGaO3. The kinetics of oxygen in-diffusion was studied
 by resistivity changes during corresponding isothermal annealing in a
 reduced oxygen atmosphere. The authors found the rate of oxygen uptake
 to be dependent on film thickness, abruptly increasing after some
 critical film thickness of about 40 nm. The increase in the rate of
 oxygen uptake with increasing film thickness continued over several
 orders of magnitude and then saturated for a film thickness of about 500
 nm. AFM (atomic-force-microscope) studies revealed a transition from a
 dislocation-free to a dislocation-developed microstructure at around the
 critical film thickness. The authors suggest that these dislocations
 serve as easy paths for c-axis oxygen diffusion.
<p>
<p>
 Applications
<p>
 A preprint by J. C. Macfarlane et al. (National Physical Laboratory,
 Teddington) reports the fabrication and characterization of high-
 temperature-superconducting resistively shunted superconducting quantum
 interference devices (HTS R-SQUIDs) consisting of two YBa2Cu3O7-d (YBCO)
 grain-boundary junctions shunted by gold-film resistors of ~20 micro-
 ohms. The small value and stability of the resistor allow narrow-band
 heterodyne oscillations to be generated between the Josephson
 oscillations in the individual junctions. The frequency can be
 precisely controlled in accordance with the ac Josephson effect by
 adjustment of an external current applied to the YBCO/Au/YBCO shunt
 resistor, and the linewidth is determined in principle only by Johnson
 noise in the resistor. The authors report measurements of the signal
 power (~nW), tunability of the center frequency from 5 to 50 GHz,
 frequency stability, and linewidth of the heterodyne Josephson
 oscillation. Although the authors observed linewidth broadening due to
 nonthermal fluctuations, the measured linewidth of ~30 kHz at T = 17 K
 at a center frequency of 24 MHz is evidently the narrowest reported for
 Josephson oscillations in an HTS device of this type.
<p>
 A preprint by M. B. Srinivas (Hyderabad) et al. reports investigations
 of the properties of liquid nitrogen not only as a coolant but also an
 insulator in high-temperature superconducting electrical power
 apparatus. The authors found that while liquid nitrogen exhibits a
 small dielectric loss at power frequency, this loss is not intrinsic to
 the liquid but is attributable to the presence of impurities. The
 authors present extensive measurements of the dielectric loss under a
 variety of test conditions and conclude that liquid nitrogen is
 eminently suitable as a dielectric/insulating medium for HTS power
 apparatus.
<p>
<p>
 Vortices
<p>
 A preprint by P. Le Doussal (Ecole Normale Superieure) and T. Giamarchi
 (Orsay) discusses the question of the generation of topological defects
 (dislocations) by quenched disorder in two-dimensional periodic systems,
 such as vortices in type-II superconducting films. The authors extend
 their earlier work to include effects of freezing and pinning of
 dislocations at low temperature. They conclude that there is a wide
 region of length scales, temperature, and disorder where dislocation-
 free Bragg-glass-like behavior should be observable.
<p>
 The energy of a tilted vortex trapped on an inclined columnar defect
 (CD), produced by heavy-ion-beam irradiation, has been calculated by I.
 Baladie and A. Buzdin (Bordeaux). If the CD radius is larger than the
 superconducting coherence length, the authors find that in a weak
 magnetic field, vortices always prefer to be on a tilted CD than to be
 aligned along the external field. The authors note that the existence
 of inclined trapped vortices could be revealed by torque measurements
 and could also lead to anisotropy of the in-plane resistivity and the
 critical current.
<p>
 A preprint by R. D. Santiago (San Jose State) et al. reports studies of
 the vortex states of Bi-2212 and Tl-2223 by muon spin resonance (muSR).
 Using a maximum-entropy technique to analyze the data, the authors
 extract twin-peak signatures in the main vortex signals. The splitting
 is qualitatively in agreement with theoretical predictions for d-wave
 superconductors, but the magnitudes of the splittings are about twice
 the predicted values.
<p>
 According to Y. Kopelevich and P. Esquinazi (Leipzig), the vortex
 lattice does not melt along a material- and sample-dependent boundary in
 the H-T (field-temperature) plane. Instead, it depins from the
 underlying crystal matrix and becomes more ordered. The authors assert
 that when the depinning line is sharp, the difference between the
 equilibrium magnetization M_[eq](H,T) of the pinned and unpinned vortex
 lattice leads to the observed step-like change Delta[M_[eq](H,T)].
<p>
 Starting from the BCS theory, M. Machida (JAERI and CREST) et al. have
 developed a microscopic theory for stacks of intrinsic Josephson
 junctions. The authors derive model equations for the macroscopic
 longitudinal and transverse dynamics and show that low-energy
 fluctuations around the Josephson relation are responsible for the
 longitudinal charge-density models propagating along the stacking
 direction. The authors also show that under certain approximations,
 their results reduce to the sine-Gordon equation or the Koyama-Tachiki
 model.
<p>
 A preprint by L. M. Fisher (Moscow) et al. presents a theory for the
 onset of vortex penetration into a hard, isotropic, semi-infinite
 superconductor after rotation of a magnetic field H applied parallel to
 the surface. The authors derive macroscopic equations and apply them
 for different magnetic histories. The authors find that the vortices
 entering into the sample are not parallel to the direction of H.
 Instead, the authors argue that the angle between the vortices and H can
 be large, even approaching pi/2.
<p>
 Scaling exponents describing the roughness of penetrating flux fronts in
 high-Tc superconductors are determined theoretically in a preprint by A.
 E. Khalil (Xavier). The theory is based on the solution of a nonlinear
 diffusion equation describing the penetration of vortex lines into a
 type-II superconductor. The author notes that the results of
 simulations are in good agreement with recent experimental magneto-
 optical observations in YBa2Cu3O7-d.
<p>
<p>
 Theory
<p>
 According to a preprint by M. E. Flatte (Iowa), the recently observed
 properties of quasiparticle resonant states near impurities on the
 surface of Bi-2212 demonstrate that in-plane Andreev processes are
 either absent or phase-incoherent. The author's analysis of the
 spectral and spatial details of the electronic structure near a Zn
 impurity also suggest an effective magnetic component of the impurity
 potential. The author proposes further experiments to clarify whether
 the effective moments of nearby impurities are correlated.
<p>
 Using the linearized Bogoliubov-de Gennes equation, L. Marinelli
 (Harvard) et al. have studied the quasiparticle spectrum of a two-
 dimensional d-wave superconductor in the mixed state H_[c1] << H <<
 H_[c2] both analytically and numerically. The authors found that for a
 Bravais lattice of vortices the spectrum remains gapless when a magnetic
 field is turned on.
<p>
 The theory of scanning tunneling spectroscopy of low-energy
 quasiparticle (QP) states in vortex lattices in d-wave superconductors
 has been developed by A. S. Mel'nikov (Nizhny Novgorod), taking into
 account effects caused by an extremely large extension of QP
 wavefunctions in the nodal directions and the band structure in the QP
 spectrum. The author analyzes oscillatory structures in the STM
 spectra, which correspond to Van Hove singularities.
<p>
 Exotic objects in chiral superfluids and superconductors are discussed
 in a preprint by G. E. Volovik (Helsinki University of Technology and
 Landau Institute). These are (a) vortices with fractional quantum
 numbers (N = 1/2 in chiral superfluids and N = 1/2 and 1/4 in chiral
 superconductors), which play the role of Alice strings in relativistic
 theories, and (b) the hedgehog in the isospin field, which is the
 counterpart of the Dirac magnetic monopole. These objects of different
 dimensions are topologically connected, and the combined object is
 called a nexus in relativistic theories. In chiral superconductors, the
 nexus has magnetic charge emanating radially from the hedgehog, while
 the half-quantum vortex plays the role of the Dirac string.
<p>
 A diagrammatic expansion method around the atomic limit (U >> t) for the
 U-t-t' Hubbard model at half filling and finite temperature has been
 applied in a preprint by Ph. Brune and A. P. Kampf (Augsburg). By using
 a continued-fraction representation, the authors ensure that the one-
 particle Green's function has the correct analytic properties. From an
 analysis of the spectral function A(k,omega), the authors find an energy
 dispersion relation with a d_[x^2-y^2]-wave modulation of the energy gap
 in the insulating phase. This anisotropy compares well with
 experimental ARPES results on insulating cuprates.
<p>
 A theory for inelastic neutron scattering (INS) and nuclear magnetic
 resonance (NMR) experiments in the pseudogap regime of the underdoped
 high-Tc cuprates has been developed by H. Westfahl Jr. (Illinois-Urbana)
 and D. K. Morr (Illinois-Urbana and Los Alamos). The authors find that
 superconducting phase fluctuations greatly affect the temperature and
 frequency dependence of the spin susceptibility chi" probed by both
 experimental techniques. This result explains the appearance of a
 resonance peak, observed in INS experiments, below a temperature T_0 >
 Tc. In the same temperature regime, the authors find that the [63]^Cu
 spin-lattice relaxation rate 1/T_1, measured in NMR experiments, is
 suppressed. The authors note that their results are in qualitative
 agreement with available experimental data.
<p>
 Universal finite-temperature properties of the 3D XY model, extended to
 anisotropic type-II superconductors, and universal quantum critical
 properties in 2D are outlined in a paper by T. Schneider and J. M.
 Singer (Zurich). The authors review: (a) the mounting evidence for 3D
 XY behavior in optimally doped cuprate superconductors and the 3D-to-2D
 crossover in the underdoped regime, (b) finite-size limitations imposed
 by inhomogeneities, (c) experimental evidence for a 2D XY quantum
 critical point in the underdoped limit, where the superconductor-to-
 insulator transition occurs, and (d) emerging implications and
 constraints for microscopic models.
<p>
 Using the exact cluster diagonalization and recent quantum Monte Carlo
 simulations, A. S. Alexandrov (Loughborough) has analyzed the dynamic
 properties of small polarons and bipolarons formed by short-range
 (Holstein) and long-range (Froehlich) electron-phonon interactions. The
 exact results agree well with the canonical Holstein theory for a
 cluster and with the Lang-Firsov theory for a lattice. The author finds
 that (bi)polarons exist in itinerant Bloch states at temperatures well
 below the characteristic phonon frequency, no matter which values the
 parameters of the system take. The author also notes that the bipolaron
 theory provides a parameter-free expression for Tc, describing the Tc of
 many cuprates without any fitting parameters.
<p>
 As noted in a preprint by F. Venturini (W-M-I, Garching) et al., while
 the low-frequency electronic Raman response in the superconducting state
 of the cuprates can be largely understood in terms of a d-wave energy
 gap, a long-standing problem has been an explanation for the spectra
 observed in A_[1g] polarization orientations. The authors present
 calculations suggesting that the peak position of the observed A_[1g]
 spectra is due to a collective spin-fluctuation mode.
<p>
 An experiment to determine whether there are superconducting pairing
 fluctuations in the pseudogap regime of the high-Tc materials has been
 proposed by I. Martin and A. Balatsky (Los Alamos). In the proposed
 experimental setup, two samples above Tc should be brought into contact
 at a single point, and the differential ac conductivity should be
 measured in the presence of a constant applied bias voltage V between
 the samples. The authors argue that pairing fluctuations will produce a
 randomly fluctuating Josephson current with zero mean but that the
 current-current correlator will have a characteristic frequency given by
 the Josephson frequency omega_J = 2eV/h. The authors also predict that
 the differential ac conductivity should have a peak at the Josephson
 frequency with a width determined by the phase-fluctuation time.
<p>
 A fully self-consistent microscopic model to study the retardation and
 correlation effects of the barrier within a Josephson junction has been
 formulated by P. Miller and J. K. Freericks (Georgetown). The junction
 is described by a series of planes, with electronic correlation included
 through a local self-energy for each plane. The authors calculate the
 figure of merit for a Josephson junction, i.e., the product of the
 critical current I_c and the normal-state resistance R_n for junctions
 with different barrier materials. Although semiclassical calculations
 predict that these two quantities are determined by the transmission
 probabilities of electrons in such a way that their product I_cR_n is
 constant for a given superconductor at fixed temperature, the authors'
 self-consistent solutions for different types of barrier do not have
 this property. The authors suggest some forms of barrier that could
 increase the I_cR_n product and hence improve the frequency response of
 a Josephson device.
<p>
 The quantum-measurement process by a single-electron transistor or a
 quantum point contact coupled to a quantum bit has been studied by Y.
 Makhlin (Karlsruhe and Landau Institute) et al. The authors find a
 unified description of the statistics of the monitored quantity, the
 current, in the regime of strong measurement; they expect this
 description to apply for a wide class of quantum measurements. The
 probability distributions for the current and charge in different stages
 of the process are derived. In the parameter regime of strong
 measurement, the current develops a telegraph-noise behavior, which can
 be detected in the noise spectrum.
<p>
<p>
 Other Activities
<p>
 The dependence of the transport properties of square Josephson-junction
 arrays upon the direction of the applied dc current has been studied
 experimentally and numerically by V. I. Marconi (Bariloche) et al. The
 authors present: (a) computational simulations of current-voltage
 curves at finite temperatures for a single vortex in a square (L x L)
 array (f = Ha^2/phi_0 = 1/L^2) and (b) experimental measurements in 100
 x 1000 arrays in a low magnetic field corresponding to f ~~ 0.02. The
 authors find that the transverse voltage vanishes only in the directions
 of maximum symmetry of the square lattice: the [10] and [01] directions
 (parallel bias) and the [11] direction (diagonal bias). For
 orientations different from these symmetry directions, the transverse
 voltage depends strongly on the angle phi of the current.
<p>
 Flux distributions in an Y-123 thin film with artificial granularity (a
 hexagonal-close-packed lattice of 50 micrometers disks) have been
 observed by M. R. Koblischka (Oslo) et al. using magneto-optical
 imaging. At low magnification, flux patterns generated exclusively by
 the intergranular currents flowing in the intergranular area (effective
 medium) are directly observed. Two-dimensional flux-density profiles
 reveal the intergranular current density. Observations at high
 magnification reveal flux penetration and pinning within the individual
 disks, and the authors then can identify and study the different
 contributions of the intergranular and intragranular current densities
 to the flux patterns. The authors show that their model sample
 reproduces several features observed in Ag-sheathed (Bi,Pb)-2223 tapes.
<p>
 Both ferromagnetic- and superconducting-like magnetization hysteresis
 loops have been observed by Y. Kopelevich (Leipzig) et al. in highly
 oriented pyrolytic graphite (HOPG) samples below and above room
 temperature. The authors also found that both behaviors are very
 sensitive to low-temperature heat treatment. The authors discuss why
 magnetic impurities do not appear to be the reason for the observed
 phenomena.
<p>
 The weight of a pile of pellets of Bi-2212 superconductor has been
 studied by H. Reiss (ABB Alstom Power Technology) when cooling it in
 liquid nitrogen. The results were compared with those for normal or
 nonconductors, in standard volumes and under the same temperature and
 heat-transfer conditions. Two different experiments were performed:
 (a) measurement of apparent weight when dipping samples housed in a
 sample holder into the coolant under thermal equilibrium and (b)
 measurement of the total weight of the cryostat, cryogenic liquid,
 sample holder, and samples. Both experiments yielded a small increase
 of the superconductor sample weight. Application of an external
 magnetic field eliminated the observed effect, suggesting a possible
 correlation of superconductivity with gravity. A thorough discussion of
 errors is included. The author invites colleagues at other laboratories
 to check his results.
<p>
<p>
 Overview
<p>
 A paper analyzing microwave-cavity-perturbation methods and showing how
 they can be used to study the dynamic magnetic and dielectric response
 in the GHz frequency range has been prepared by Z. Zhai et al.
 (Northeastern). Using pure Nb superconducting cavities, the authors are
 able to measure relative changes with exceptionally high precision and
 sensitivity. The authors briefly describe how this method has been used
 to investigate magnetodynamics in the spin-chain material Sr2CuO3,
 dielectric loss peaks in the spin-ladder compound Sr14Cu24O41, and
 dimensional resonances in SrTiO3 (21 refs.).
<p>
<p>
 Contributed by John R. Clem
 <hr>
<p>
 Contents: Technology News begins on page 6; Preprints begin on page 7;
 Coming Events begin on page 11; and Donors are listed on page 13.
<p>
<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 processing and mailing
 are welcome.
 <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>
 Successful completion of the first 225 kV-rated superconducting coaxial
 cable prototype with cryogenic insulation was announced by Pirelli Cavi
 e Sistemi SpA, in the context of its research and development agreement
 with Electricite de France. The Pirelli-EDF cooperation started in
 October 1997 and is the first project in Europe aimed at the development
 of a high-capacity HTS cable system. The project foresees the
 feasibility study, construction, experimentation, and long-term test of
 a complete prototype system including a 50 m cable length. The purpose
 of the project is to demonstrate the industrial feasibility of HTS
 cables suitable for electrical power transmission.
<p>
 The superconducting cable prototype has been developed and manufactured
 by Pirelli at its dedicated pilot HTS cable manufacturing facility using
 HTS wire supplied by American Superconductor Corporation (ASC). The
 cable is of the cold dielectric coaxial design, and matches the
 requirements of European transmission networks. The prototype cable, 20
 m long, can carry up to 2600 A alternating current with superconductor
 electrical losses of less than 1 W/m. Its electrical insulation is
 designed to withstand an alternating voltage of 225 kV between phases.
 In a three-phase transmission system, this HTS cable would enable a
 transmitted power of 1000 MVA, a level that would today only be achieved
 at 400kV with conventional cable technology. In 1987 Pirelli started
 its R&D activity in the HTS superconductivity field and at the end of
 1998 successfully completed the qualification of a 115 kV, 400 MVA warm
 dielectric superconducting cable, developed in the context of an
 agreement with the Electric Power Research Institute (EPRI) under the US
 Department of Energy (DOE) Superconductivity Partnership Initiative.
 Subsequently, in October 1998, the DOE awarded a contract to Pirelli to
 install three 120 m, 24 kV/2400 A, HTS warm dielectric cables in the
 network of Detroit Edison -- the first HTS system operating in a real
 network and will replace the existing conventional cable system
 comprising nine copper-conductor cables.
<p>
 Concurrently, Pirelli Cavi e Sistemi is developing advanced cold
 dielectric coaxial superconducting cable systems in Italy, Germany, and
 France. The objective is to manufacture, install, and demonstrate
 various types of HTS cables in commencement of commercialization. For
 further information, contact Marco Nassi, R&D Manager, Superconducting
 Technologies, Pirelli Cavi e Sistemi, Viale Sarca 222, I-20126 Milan,
 Italy; telephone +39 02 6442 3676; telefax +39 02 6442 9431; e-mail
 <a href="mailto:marco.nassi@pirelli.com">marco.nassi@pirelli.com.</a>
<p>
 Three 100-foot long cables have been delivering power to three of
 Southwire's manufacturing facilities at its Carrolton, Georgia,
 headquarters since early January of this year, signaling a major step
 toward commercialization of the technology. Intermagnetics General
 Corporation, one of the component providers for the Southwire project,
 hailed the unveiling of this practical use of HTS cables as a milestone
 in the effort to commercialize HTS applications for the electric utility
 industry. The company is proceeding with the next phase of HTS
 development -- bringing the cost of HTS in line with the price-
 performance levels needed to make it commercially viable to manufacture
 superconducting equipment such as transformers, cable, motors,
 generators, and fault current controllers. Intermagnetics is also
 working with industry and government partners on prototype
 superconducting transformers and current controllers, as well as other
 devices that are now in varying stages of development and testing.
 These projects are expected to lead to commercialization over the next
 three to five years. For information, contact Intermagnetics General
 Corporation, 450 Old Niskayuna Road, P.O. Box 461, Latham, NY 12110-
 0461; telephone (518) 782-1122. Or contact Gary Leftwich, Senior
 Communications Specialist; telephone (770) 832-4884; e-mail
 <a href="mailto:gary_leftwich@southwire.com">gary_leftwich@southwire.com.</a>
<p>
 Contributed by Sreeparna Mitra
<p>
 <hr>
<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>
 B. A. Albiss, M. K. Hasan, M. A. Al-Akhras, I. A. Al-Omari, A. Shariah,
 J. Shobaki, K. A. Azez, and H. Ozkan, "Dissipative Behavior and gamma-
 Irradiation of Silver-Sheathed Bi1.8Pb0.4Sr2Ca2Cu3Ox Tape." To be
 published in Physica C (in press). Department of Physics, Jordan
 University of Science and Technology, P.O. Box 3030, Irbid 22110,
 JORDAN; telefax +962 2 295 123; e-mail <a href="mailto:qaseer@just.edu.jo">qaseer@just.edu.jo.</a> Key words:
 Bi-based tape, critical current, magnetoresistance, gamma irradiation.
 74.60.Ge; 74.60.Jg.
<p>
 A. S. Alexandrov, "Polaron Dynamics and Bipolaron Condensation in
 Cuprates." To be published in Phys. Rev. B. Department of Physics,
 Loughborough University, Loughborough Leicestershire LE11 3TU, UNITED
 KINGDOM; telephone +44 1509 228409; telefax +44 1509 223986. 74.20.-z.
<p>
 S. P. Athur, U. Balachandran, and K. Salama, "Melt Processing of Yb-123
 Tapes." Presented at the 6th Int. Conf. on Mater. and Mech. of
 Supercond. and High Temp. Supercond. (M^2S-HTSC-VI), Houston, Tex., Feb.
 20-25, 2000. Texas Center for Superconductivity, University of Houston,
 Houston, TX 77204-5932; telephone (713) 743-8200; telefax (713) 743-
 8201; e-mail <a href="mailto:preprints@www.tcs.uh.edu">preprints@www.tcs.uh.edu.</a>
<p>
 N. Hari Babu, T. Rajasekharan, and V. Seshu Bai, "Use of ac Inductive
 Method to Assess the Quality of Bulk Melt Textured Superconductors." To
 be published in Physica C (in press). Interdisciplinary Research Centre
 in Superconductivity, University of Cambridge, Madingley Road, Cambridge
 CB3 0HE, UNITED KINGDOM; telephone +44 1223 337 049; telefax +44 1223
 337 074; e-mail <a href="mailto:nhb24@cam.ac.uk">nhb24@cam.ac.uk.</a> Key words: flux profiles,
 superconductors, bulk critical current density.
<p>
 I. Baladie and A. Buzdin, "Vortex Trapping by Tilted Columnar Defects."
 To be published in Phys. Rev. B. Centre de Physique Theorique et de
 Modelisation, Universite Bordeaux I, CNRS-ERS 2120, F-33405 Talence
 Cedex, FRANCE. 61.80.Jh; 74.60.Ge; 74.62.Dh.
<p>
 Ph. Brune and A. P. Kampf, "Anisotropy of the Energy Gap in the
 Insulating Phase of the U-t-t' Hubbard Model." Instituet fuer Physik,
 Theoretische Physik III, Elektronische Korrelationen und Magnetismus,
 Universitaet Augsburg, D-86135 Augsburg, GERMANY; preprint also
 available at <a href="http://xxx.lanl.gov/abs/cond-mat/0001210">http://xxx.lanl.gov/abs/cond-mat/0001210.</a> 71.10.-w;
 71.10.Fd; 71.10.Hf; 71.27.+a; 71.30.+h.
<p>
 H. Castro, A. Gerber, and A. Milner, "Calorimetric Study of ac-Field
 Losses in Superconducting BSCCO Tubes." To be published in Physica C
 (in press). School of Physics and Astronomy, Tel Aviv University, Ramat
 Aviv, Tel Aviv 69978, ISRAEL; telephone +972 3 6408 300; telefax +972 3
 6422 979; e-mail <a href="mailto:hcastro@ccsg.tau.ac.il">hcastro@ccsg.tau.ac.il.</a> Key words: applications of
 high-Tc superconductors, magnetic losses, calorimetry, hysteresis,
 geometrical effects.
<p>
 Mu-Yong Choi and J. S. Kim, "Unusual Tc Variation with Hole
 Concentration in Bi2Sr2-xLaxCuO6+d." To be published in Phys. Rev. B.
 Department of Physics, Sungkyunkwan University, Suwon 440-746, KOREA;
 telephone +82 331 290 7044; telefax +82 331 290 7055; e-mail
 <a href="mailto:mychoi@skku.ac.kr">mychoi@skku.ac.kr</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/0001339">http://xxx.lanl.gov/abs/cond-mat/0001339.</a> 74.72.Hs; 74.62.Dh; 74.62.Bf;
 74.25.Dw.
<p>
 S. Colonna, F. Arciprete, A. Balzarotti, G. Balestrino, P. G. Medaglia,
 and G. Petrocelli, "EXAFS Study of the [BaCuO2]2/[(Ca,Sr)CuO2]n
 Artificial Superconducting Superlattices." To be published in Physica C
 (in press). Contact A. Balzarotti, Dipartimento di Fisica, Istituto
 Nazionale di Fisica della Materia, Universita di Roma "Tor Vergata," Via
 della Ricerca Scientifica 1, I-00133 Rome, ITALY; telephone +39 06 7259
 4565; telefax +39 06 2023 507; e-mail <a href="mailto:balza@roma2.infn.it">balza@roma2.infn.it.</a> Key words:
 high-Tc superconductors, superlattices, EXAFS. 74.72.-h; 74.80.Dm;
 61.10.Ht.
<p>
 Elisa Ercolessi, Giuseppe Morandi, Leonardo Pisani, and Marco Roncaglia,
 "Mixed Phases for the t-J Model." To be published in Physica C (in
 press). Dipartimento di Fisica, Universita di Bologna, INFM and INFN,
 Unita di Bologna, Via Irnerio 46, I-40126 Bologna, ITALY; e-mail
 <a href="mailto:ercolessi@alteo1.bo.infn.it">ercolessi@alteo1.bo.infn.it.</a> Key words: t-J model, RVB states,
 nonmagnetic states. 71.27.+a; 74.20.-z.
<p>
 L. M. Fisher, S. E. Savel'ev, and V. A. Yampol'skii, "The Onset of
 Vortex Penetration into a Hard Superconductor Induced by the Rotation of
 an Applied Magnetic Field." To be published in Physica C (in press).
 All-Russian Electrical Engineering Institute, 12 Krasnokazarmennaya
 Street, 111250 Moscow, RUSSIA; telephone +7 095 361 9226; telefax +7 095
 361 9226; e-mail <a href="mailto:lfisher@online.ru">lfisher@online.ru.</a> Key words: hard superconductors,
 flux pinning, critical state, surface barrier.
<p>
 Michael E. Flatte, "Quasiparticle Resonant States as a Probe of Short-
 Range Electronic Structure and Andreev Coherence." Submitted to Phys.
 Rev. Lett. Department of Physics and Astronomy, 203 Van Allen Hall,
 University of Iowa, Iowa City, IA 52242-1479; telephone (319) 335-1686;
 telefax (319) 335-1753; e-mail <a href="mailto:flatte@rashi.physics.uiowa.edu">flatte@rashi.physics.uiowa.edu</a> preprint
 also available at <a href="http://xxx.lanl.gov/abs/cond-mat/0001454">http://xxx.lanl.gov/abs/cond-mat/0001454.</a>
<p>
 Hiroki Fujii, Yoshimitsu Hishinuma, Hitoshi Kitaguchi, Hiroaki Kumakura,
 and Kazumasa Togano, "Study on the Heat Treatment Condition to Improve
 Coupling of Grains in Bi2-xPbxSr2CaCu2Oy/Ag Tapes." To be published in
 Physica C (in press). National Research Institute for Metals, 1-2-1
 Sengen, Tsukuba-shi, Ibaraki 305 0047, JAPAN; telephone +81 298 59 2326;
 telefax +81 298 59 2301; e-mail <a href="mailto:fuzii@nrim.go.jp">fuzii@nrim.go.jp.</a> Key words: (Bi,Pb)-
 2212/Ag tapes, Ca2PbO4, PO2-temperature diagram, coupling of grains.
 74.60.Jg; 74.72.Hs; 74.76.Bz.
<p>
 A. Yu. Galkin, Y. Kopelevich, P. Esquinazi, A. Setzer, V. M. Pan, and S.
 N. Barilo, "Effect of the Sample Geometry on the Second Magnetization
 Peak in Single Crystalline Ba0.63K0.37BiO3 Thick Film." To be published
 in Solid State Commun. Department of Superconductivity and Magnetism,
 Institut fuer Experimentelle Physik II, Universitaet Leipzig,
 Linnestrasse 5, D-04103 Leipzig, GERMANY.
<p>
 M.-H. Julien, T. Feher, M. Horvatic, C. Berthier, O. N. Bakharev, P.
 Segransan, G. Collin, and J.-F. Marucco, "[63]^Cu NMR Evidence for
 Enhanced Antiferromagnetic Correlations Around Zn Impurities in
 YBa2Cu3O6.7." Grenoble High Magnetic Field Laboratory, Max-Planck-
 Institut fuer Festkoerperforschung and Centre National de la Recherche
 Scientifique, B.P. 166, F-38042 Grenoble Cedex 9, FRANCE; preprint also
 available at <a href="http://xxx.lanl.gov/abs/cond-mat/9911194">http://xxx.lanl.gov/abs/cond-mat/9911194.</a> 76.60.-k;
 74.25.Ha; 74.62.Dh.
<p>
 A. Kazimirov, L. X. Cao, G. Scherb, L. Cheng, M. J. Bedzyk, and J.
 Zegenhagen, "X-ray Standing Wave Analysis of Rare Earth Atomic Positions
 in RBa2Cu3O7-d Thin Films." To be published in Solid State Commun.
 Contact J. Zegenhagen, European Synchrotron Radiation Facility, B.P.
 220, F-38043 Grenoble Cedex, FRANCE; e-mail <a href="mailto:zegenhagen@esrf.fr">zegenhagen@esrf.fr.</a> Key
 words: high-temperature superconductors, thin films, x-ray standing
 waves. 61.10.-i; 68.55.Ln; 74.76.Bz; 81.15.Fg.
<p>
 Ali E. Khalil, "Dynamics of Penetrating Flux Fronts in High-Tc
 Superconductors." Submitted to Phys. Lett. Department of Physics,
 Xavier University, 3800 Victory Parkway, Cincinnati, OH 45207-4111;
 telephone (513) 745-3626; telefax (513) 745-2070.
<p>
 G. C. Kim, M. Y. Cheon, and Y. C. Kim, "Penetration of Vortex Line into
 Small Type-II Superconducting Particle." To be published in Physica C
 (in press). Contact Y. C. Kim, Department of Physics, Pusan National
 University, Pusan 609-735, SOUTH KOREA; telephone +82 51 510 2224;
 telefax +82 51 513 7664; e-mail <a href="mailto:yckim@hyowon.pusan.ac.kr">yckim@hyowon.pusan.ac.kr.</a> Key words:
 penetration field, Gibbs free energy, vortex line.
<p>
 M. R. Koblischka, L. Pust, T. H. Johansen, B. Nilsson, and T. Claeson,
 "Flux Distributions of an Artificially Granular YBa2Cu3O7-d Thin Film
 Observed Using Magneto-Optic Imaging." To be published in Physica C (in
 press). Nordic Superconductor Technologies (NST), Priorparken 685, DK-
 2605 Brondby, DENMARK; e-mail <a href="mailto:m.r.koblischka@fys.uio.no">m.r.koblischka@fys.uio.no.</a> Key words:
 flux distributions, YBa2Cu3O7-d thin film, magneto-optic imaging.
 74.80.-g; 74.60.Ec; 74.60.Ge; 74.60.Jg.
<p>
 Y. Kopelevich and P. Esquinazi, "Vortex Lattice Depinning vs Vortex
 Lattice Melting: A Pinning-Based Explanation of the Equilibrium
 Magnetization Jump." Department of Superconductivity and Magnetism,
 Institut fuer Experimentelle Physik II, Universitaet Leipzig,
 Linnestrasse 5, D-04103 Leipzig, GERMANY; P. Esquinazi's e-mail
 <a href="mailto:esquin@physik.uni-leipzig.de">esquin@physik.uni-leipzig.de</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/0002019">http://xxx.lanl.gov/abs/cond-mat/0002019.</a> Key words: superconductors,
 flux pinning, phase transitions.
<p>
 Y. Kopelevich, P. Esquinazi, J.H.S. Torres, and S. Moehlecke,
 "Ferromagnetic- and Superconducting-Like Behavior of Graphite." To be
 published in J. Low Temp. Phys. Department of Superconductivity and
 Magnetism, Institut fuer Experimentelle Physik II, Universitaet Leipzig,
 Linnestrasse 5, D-04103 Leipzig, GERMANY; P. Esquinazi's e-mail
 <a href="mailto:esquin@physik.uni-leipzig.de">esquin@physik.uni-leipzig.de</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9912413">http://xxx.lanl.gov/abs/cond-mat/9912413.</a> 74.10.+v; 75.60.-d; 71.27.+a.
<p>
 A. Kursumovic, P. Berghuis, V. Dediu, J. E. Evetts, F. C. Matacotta, and
 G. A. Wagner, "Thickness-Dependent Oxygenation in c-Axis Oriented
 REBa2Cu3O7-d Thin Films Deposited on Closely Matched Substrates." To be
 published in Physica C (in press). Department of Materials Science,
 University of Cambridge, Cambridge CB2 3QZ, UNITED KINGDOM; telefax +44
 1223 334373; e-mail <a href="mailto:ak237@cus.cam.ac.uk">ak237@cus.cam.ac.uk.</a> Key words: oxygen diffusion,
 YBaCuO, GdBaCuO, thin films, dislocations. 66.30.Hs; 74.76.Bz;
 74.25.Fy.
<p>
 I. L. Landau and H. R. Ott, "Thermally Activated Flux Creep in
 YBa2Cu3O7-x Film." To be published in Physica C (in press).
 Laboratorium fuer Festkoerperphysik, ETH Hoenggerberg, HPF D13, CH-8093
 Zurich, SWITZERLAND; telephone +41 1633 2263; telefax +41 1633 1077; e-
 mail <a href="mailto:landau@solid.phys.ethz.ch">landau@solid.phys.ethz.ch.</a> Key words: flux creep, activation
 energy, thin films. 74.60.Ge; 74.72.-h.
<p>
 Pierre Le Doussal and Thierry Giamarchi, "Dislocations and Bragg Glasses
 in Two Dimensions." To be published in Physica C (in press). CNRS-
 Laboratoire de Physique Theorique de l'Ecole Normale Superieure, 24 rue
 Lhomond, F-75231 Paris, FRANCE; telephone +33 1 4432 2004; telefax +33 1
 4336 7666; e-mail <a href="mailto:ledou@physique.ens.fr">ledou@physique.ens.fr.</a> Key words: Bragg glasses,
 dislocations, bare core energy. 74.60.Ge; 05.20.-y.
<p>
 S. Lupi, P. Calvani, M. Capizzi, and P. Roy, "Far-Infrared Reflectivity
 of Bi2Sr2CuO6: The 'Anomalous Drude' Model and the Optical Pseudogap
 Revisited." Contact P. Calvani, Istituto Nazionale di Fisica della
 Materia (INFM), Dipartimento di Scienze Fisica, Universita di Roma "La
 Sapienza," Piazzale Aldo Moro 2, I-00185 Rome, ITALY; e-mail
 <a href="mailto:paolo.calvani@roma1.infn.it">paolo.calvani@roma1.infn.it</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/0001244">http://xxx.lanl.gov/abs/cond-mat/0001244.</a> 74.25.Gz; 74.72.-h; 74.25.Kc.
<p>
 J. W. Lynn, B. Keimer, C. Ulrich, C. Bernhard, and J. L. Tallon,
 "Antiferromagnetic Order of the Ru and Gd in Superconducting
 RuSr2GdCu2O8." Submitted to Phys. Rev. Lett. NIST Center for Neutron
 Research, Bldg. 235, National Institute of Standards and Technology,
 Gaithersburg, MD 20899; telephone (301) 975-6246; telefax (301) 921-
 9847; e-mail <a href="mailto:Jeff.Lynn@nist.gov">Jeff.Lynn@nist.gov</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/0001456">http://xxx.lanl.gov/abs/cond-mat/0001456.</a> 74.72.Jt; 75.25.+z; 74.25.Ha;
 75.30.Kz.
<p>
 J. C. Macfarlane, L. Hao, D. A. Peden, and J. C. Gallop, "Linewidth of a
 Resistively-Shunted High-Temperature-Superconductor Josephson Heterodyne
 Oscillator." To be published in Appl. Phys. Lett. National Physical
 Laboratory, Queen's Road, Teddington TW11 0LW, Middlesex, UNITED
 KINGDOM; telephone +44 181 977 3222; telefax +44 181 943 6458; e-mail
 <a href="mailto:john.macfarlane@npl.co.uk">john.macfarlane@npl.co.uk.</a>
<p>
 M. Machida, T. Koyama, A. Tanaka, and M. Tachiki, "Theory of the
 Superconducting Phase and Charge Dynamics in Intrinsic Josephson-
 Junction Systems: Microscopic Foundation for Longitudinal Josephson
 Plasma and Phenomenological Dynamical Equations." To be published in
 Physica C (in press). Center for Promotion of Computational Science and
 Engineering, Japan Atomic Energy Research Institute, 2-2-54 Nakameguro,
 Meguro-ku, Tokyo 153-0061, JAPAN; telephone +81 3 5723 2517; telefax +81
 3 5723 2537; e-mail <a href="mailto:mac@sugar.tokai.jaeri.go.jp">mac@sugar.tokai.jaeri.go.jp.</a> Key words:
 superconducting phase, charge dynamics, intrinsic Josephson-junction
 systems. 74.25.Fy; 74.50.+r; 74.80.Dm.
<p>
 Yuriy Makhlin, Gerd Schoen, and Alexander Shnirman, "Statistics and
 Noise in a Quantum Measurement Process." Institut fuer Theoretische
 Festkoerperphysik, Universitaet Karlsruhe, D-76128 Karlsruhe, GERMANY;
 e-mail <a href="mailto:makhlin@tfp.physik.uni-karlsruhe.de">makhlin@tfp.physik.uni-karlsruhe.de</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/0001423">http://xxx.lanl.gov/abs/cond-mat/0001423.</a>
<p>
 V. I. Marconi, S. Candia, P. Balenzuela, H. Pastoriza, and D. Dominguez,
 "Orientational Pinning and Transverse Voltage: Simulations and
 Experiments in Square Josephson Junction Arrays." Centro Atomico
 Bariloche, 8400 San Carlos de Bariloche, Rio Negro, ARGENTINA; e-mail
 <a href="mailto:marcov@cab.cnea.gov.ar">marcov@cab.cnea.gov.ar</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/0001392">http://xxx.lanl.gov/abs/cond-mat/0001392.</a>
<p>
 Luca Marinelli, B. I. Halperin, and S. H. Simon, "Quasiparticle Spectrum
 of d-Wave Superconductors in the Mixed State." Department of Physics,
 Harvard University, Cambridge, MA 02138; e-mail
 <a href="mailto:marinell@cmts.harvard.edu">marinell@cmts.harvard.edu</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/0001406">http://xxx.lanl.gov/abs/cond-mat/0001406.</a>
<p>
 Ivar Martin and Alexander Balatsky, "Probing Pseudogap by Josephson
 Tunneling." Theoretical Division, Los Alamos National Laboratory, Los
 Alamos, NM 87545; e-mail <a href="mailto:ivar@viking.lanl.gov">ivar@viking.lanl.gov</a> preprint also available
 at <a href="http://xxx.lanl.gov/abs/cond-mat/0002043">http://xxx.lanl.gov/abs/cond-mat/0002043.</a>
<p>
 Alexander S. Mel'nikov, "Theory of Vortex Lattice Effects on STM Spectra
 in d-Wave Superconductors." Presented at the 6th Int. Conf. on Mater.
 and Mech. of Supercond. and High Temp. Supercond. (M^2S-HTSC-VI),
 Houston, Tex., Feb. 20-25, 2000. Institute for Physics of
 Microstructures, Russian Academy of Sciences, Nizhny Novgorod 603600,
 GSP-105, RUSSIA; e-mail <a href="mailto:melnikov@ipm.sci-nnov.ru">melnikov@ipm.sci-nnov.ru</a> preprint also
 available at <a href="http://xxx.lanl.gov/abs/cond-mat/9912455">http://xxx.lanl.gov/abs/cond-mat/9912455.</a>
<p>
 P. Miller and J. K. Freericks, "Microscopic Self-Consistent Theory of
 Josephson Junctions Including Dynamical Electron Correlations."
 Department of Physics, Georgetown University, Washington, DC 20057-0995;
 e-mail <a href="mailto:miller@physics.georgetown.edu">miller@physics.georgetown.edu</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/0001269">http://xxx.lanl.gov/abs/cond-mat/0001269.</a>
<p>
 S. Misat, P. J. King, D. Fuchs, J. C. Villegier, R. P. Campion, and P.
 S. Czerwinka, "Investigation of the Electrical Dissipation Properties of
 In-Plane Aligned a-Axis YBCO Films Grown on (100) LaSrGaO4 Substrates."
 To be published in Physica C (in press). Contact P. J. King, School of
 Physics and Astronomy, University of Nottingham, University Park,
 Nottingham NG7 2RD, UNITED KINGDOM; telephone +44 115 9515 164; telefax
 +44 115 9515 184; e-mail <a href="mailto:p.j.king@nottingham.ac.uk">p.j.king@nottingham.ac.uk.</a> Key words: YBCO,
 thin films, vortex-glass, critical, scaling, exponents. 74.60.-w.
<p>
 T. OErd and N. Kristoffel, "Two Relaxation Times and the High-Tc
 Superconductivity Two-Component Scenario." To be published in Physica C
 (in press). Contact N. Kristoffel, Institute of Physics, University of
 Tartu, Riia 142, 51014 Tartu, ESTONIA; telephone +372 7 428 164; telefax
 +372 7 383 033; e-mail <a href="mailto:kolja@fi.tartu.ee">kolja@fi.tartu.ee.</a> Key words: two-band
 superconductors, relaxation times, high-Tc superconductivity. 74.20.-z;
 74.25.-q; 74.40.+k; 74.72.-h.
<p>
 R. J. Ormeno, C. E. Gough, and Guang Yang, "Antiferromagnetic Alignment
 and Relaxation Rate of Gd Spins in the High Temperature Superconductor
 GdBa2Cu3O7-d." Submitted to Phys. Rev. B. 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:r.j.ormeno@bham.ac.uk">r.j.ormeno@bham.ac.uk</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/0001379">http://xxx.lanl.gov/abs/cond-mat/0001379.</a> 74.25.Ha; 74.72.-h; 74.25.Nf.
<p>
 Jun Otsuka, Osamu Yamamoto, Yasuaki Sugihara, Toshi Senzaki, Kazushige
 Ohbayashi, Masumi Inoue, Akira Fujimaki, and Hisao Hayakawa, "Surface
 Resistance of Bi-2212 Films and Influence of Intergrowth." To be
 published in Physica C (in press). R&D Center, NGK Spark Plug, 2808
 Iwasaki, Komaki, Aichi 485-8510, JAPAN. Key words: superconducting
 films, Bi2Sr2CaCu2Ox, surface resistance, intergrowth, carrier density.
 74.76.Bz; 74.72.Hs; 74.25.Nf; 74.80.Dm.
<p>
 Jozef Pitel, Pavol Kovac, and Imrich Husek, "Calculation of the Critical
 Currents of Bi(2223)/Ag Tapes and Coils with Reduced Anisotropy in
 I_c(B) Characteristic: Effect of Different Proportional Representations
 of the Filaments Oriented Parallel and Perpendicularly to the Tape
 Surface." To be published in Physica C (in press). Institute for
 Electrical Engineering, Slovak Academy of Sciences, Dubravska 9, 842 39
 Brastislava, SLOVAK REPUBLIC; telephone +421 7 5477 5823, ext. 2003;
 telefax +421 7 5477 5816; e-mail <a href="mailto:elekpit@savba.sk">elekpit@savba.sk.</a> Key words:
 Bi(2223)Ag tapes, anisotropy, critical current, HTS magnet, two-axial
 rolling.
<p>
 M. J. Qin and C. K. Ong, "Studies on the Scaling of Fundamental ac
 Susceptibility in High Temperature Superconductors." To be published in
 Physica C (in press). Centre for Superconducting and Magnetic Materials
 and Department of Physics, National University of Singapore, Lower Kent
 Ridge Road, Singapore 119260, SINGAPORE; telephone +65 874 2625; telefax
 +65 777 6126; e-mail <a href="mailto:phyqinmj@nus.edu.sg">phyqinmj@nus.edu.sg.</a> Key words: ac
 susceptibility, scaling relation. 74.60.Ge; 74.60.Jg; 74.72.Fq.
<p>
 Harald Reiss, "A Possible Correlation Between Gravity and High
 Temperature Superconductivity." Submitted to Physica C. ABB Alstom
 Power Technology Ltd., Speyerer Strasse 4, D-69115 Heidelberg, GERMANY;
 telephone +49 6221 59 6459; telefax +49 6221 59 6163; e-mail
 <a href="mailto:harald.reiss@decrc.mail.abb.com">harald.reiss@decrc.mail.abb.com.</a> Key words: high-temperature
 superconductivity, BiSrCaCuO (2212) pellets, magnetic field, Meissner
 state, gravity.
<p>
 Leena K. Sahoo, Kanwaljeet Singh, and R. C. Budhani, "Optical Reponse in
 the Mixed State of Tl2Ba2CaCu2O8 Epitaxial Films." To be published in
 Physica C (in press). Contact R. C. Budhani, Department of Physics,
 Indian Institute of Technology Kanpur, Kanpur 208 016, INDIA; telephone
 +91 512 597 185; telefax +91 512 590 260; e-mail <a href="mailto:rcb@iitk.ac.in">rcb@iitk.ac.in.</a> Key
 words: optical response, mixed state, Tl2Ba2CaCu2O8.
<p>
 R. D. Santiago, A. M. Krupski, C. Boekema, and D. W. Cooke, "d-Wave
 Symmetry in Bi2212 and Tl2223 Vortex States: An ME-muSR Study."
 Submitted to the Proc. of the 6th Int. Conf. on Mater. and Mech. of
 Supercond. and High Temp. Supercond. (M^2S-HTSC-VI), Houston, Tex., Feb.
 20-25, 2000; to be published in Physica C. Contact C. Boekema, National
 High Magnetic Field Laboratory, 1800 E. Paul Dirac Dr., Tallahassee, FL
 32310; e-mail <a href="mailto:boekema@magnet.fsu.edu">boekema@magnet.fsu.edu.</a>
<p>
 T. Schneider and J. M. Singer, "D-XY Critical Behavior in Cuprate
 Superconductors." Physik-Institut der Universitaet Zurich,
 Winterthurerstrasse 190, CH-8057 Zurich, SWITZERLAND; e-mail
 <a href="mailto:tschnei@physik-rzu.unizh.ch">tschnei@physik-rzu.unizh.ch</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/0001258">http://xxx.lanl.gov/abs/cond-mat/0001258.</a>
<p>
 Keshav N. Shrivastava, "Flux Quantized Magnetization of Superconducting
 Aluminium." Department of Materials Chemistry, Graduate School of
 Engineering, Tohoku University, Aobayama 07, Sendai 980-8579, JAPAN;
 telefax +81 22 217 7235; e-mail <a href="mailto:keshav@aki.che.tohoku.ac.jp">keshav@aki.che.tohoku.ac.jp.</a> Key words:
 magnetization, flux quantization, superconductivity.
<p>
 M. B. Srinivas, A. K. Bhatnagar, M. Nagao, and M. Kosaki, "Liquid
 Nitrogen as a Dielectric Medium for High Temperature Superconducting
 Power Apparatus." Submitted to Cryogenics. School of Physics,
 University of Hyderabad, Hyderabad 500 046, INDIA; telephone +91 40 3010
 500-512, ext. 4400; telefax +91 40 3010 227.
<p>
 Y. S. Sung, H. Kumakura, and K. Togano, "Dip-Coated Multi-Core
 (Bi,Pb)2Sr2Ca2Cu3Ox Tape Process: An Alternative Way of Fabricating
 Multi-Core (Bi,Pb)2Sr2Ca2Cu3Ox Tape Conductors." To be published in
 Physica C (in press). National Research Institute for Metals, 1st
 Research Group, 1-2-1 Sengen, Tsukuba, Ibaraki 305, JAPAN; telephone +81
 298 59 2354; telefax +81 298 59 2301; e-mail <a href="mailto:yssung@nrim.go.jp">yssung@nrim.go.jp.</a> Key
 words: (Bi,Pb)2Sr2Ca2Cu3Ox, dip-coating, stacking, dip-coating then
 stacking (DIS), multi-core 2223 conductors.
<p>
 P. J. Thomas, J. C. Fenton, G. Yang, and C. E. Gough, "Intrinsic c-Axis
 Transport in 2212 BSCCO." Submitted to Physica C: Proc. of the 6th
 Int. Conf. on Mater. and Mech. of Supercond. and High Temp. Supercond.
 (M^2S-HTSC-VI), Houston, Tex., Feb. 20-25, 2000. Contact C. E. Gough,
 Superconductivity Research Group, University of Birmingham, Edgbaston,
 Birmingham B15 2TT, UNITED KINGDOM; e-mail <a href="mailto:C.Gough@bham.ac.uk">C.Gough@bham.ac.uk</a> preprint
 also available at <a href="http://xxx.lanl.gov/abs/cond-mat/0001365">http://xxx.lanl.gov/abs/cond-mat/0001365.</a>
<p>
 Z. Tomkowicz, P. Lunkenheimer, G. Knebel, M. Balanda, A. W. Pacyna, and
 A. J. Zaleski, "Insulator-Metal Transition by the Substitution of Ho, Y
 or Ca for Pr in PrBa2Cu3O7-d." To be published in Physica C (in press).
 Institute of Physics, Jagellonian University, Reymonta 4, 30-059 Krakow,
 POLAND; telephone +48 12 632 4888, ext. 5554; telefax +48 12 633 7086;
 e-mail <a href="mailto:uftomkow@if.uj.edu.pl">uftomkow@if.uj.edu.pl.</a> Key words: Pr substitution, electrical
 resistivity, metal-insulator transition, superconductivity suppression.
 74.72.Bk; 71.30.+h; 74.25.Fy; 74.25.Jb.
<p>
 F. Venturini, U. Michelucci, T. P. Devereaux, and A. P. Kampf,
 "Collective Modes and Electronic Raman Scattering in the Cuprates."
 Walther-Meissner-Institut, Walther-Meissner-Strasse 8, D-85748 Garching,
 GERMANY; U. Michelucci's e-mail at Universitaet Augsburg
 <a href="mailto:umberto.michelucci@physik.uni-augsburg.de">umberto.michelucci@physik.uni-augsburg.de</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/0001267">http://xxx.lanl.gov/abs/cond-mat/0001267.</a>
<p>
 G. E. Volovik, "Monopoles and Fractional Vortices in Chiral
 Superconductors." Low Temperature Laboratory, Helsinki University of
 Technology, P.O. Box 2200, FIN-02015 HUT, FINLAND; e-mail
 <a href="mailto:volovik@boojum.hut.fi">volovik@boojum.hut.fi</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9911486">http://xxx.lanl.gov/abs/cond-mat/9911486.</a>
<p>
 Harry Westfahl, Jr. and Dirk K. Morr, "Effect of Phase Fluctuations on
 INS and NMR Experiments in the Pseudo-Gap Regime of the Underdoped
 Cuprates." Submitted to Phys. Rev B. Department of Physics, University
 of Illinois at Urbana-Champaign, Urbana, IL 61801-3080; telephone (217)
 333-4440; e-mail <a href="mailto:westfahl@uiuc.edu">westfahl@uiuc.edu</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/0002039">http://xxx.lanl.gov/abs/cond-mat/0002039.</a> 74.25.-q; 74.25.Ha; 74.25.Jb;
 74.40.+k.
<p>
 T. Xiang and W. N. Hardy, "Theoretical Analysis of the c-Axis
 Conductivity of High-Tc Oxides in the Superconducting State." Institute
 of Theoretical Physics, Academia Sinica, P.O. Box 2735, Beijing 100080,
 PEOPLE'S REPUBLIC OF CHINA; e-mail <a href="mailto:txiang@itp.ac.cn">txiang@itp.ac.cn</a> preprint also
 available at <a href="http://xxx.lanl.gov/abs/cond-mat/0001443">http://xxx.lanl.gov/abs/cond-mat/0001443.</a>
<p>
 Jin Xu, Yanrong Li, Bowan Tao, Xingzhao Liu, and Hailing Wang,
 "YBa2Cu3O7-d Thin Films with Low Surface Resistance Prepared by Self-
 Template Sputtering Method." To be published in Physica C (in press).
 Forschungszentrum Karlsruhe, Institut fuer Nukleare Festkoerperphysik,
 P.O. Box 3640, D-76021 Karlsruhe, GERMANY; telephone +49 724 782 4622;
 telefax +49 724 782 4624; e-mail <a href="mailto:jin.xu@infp.fzk.de">jin.xu@infp.fzk.de.</a> Key words: high-
 temperature superconductor, thin film, YBaCuO. 74.76.Bz; 74.72.Bk.
<p>
 K. Yamagiwa, H. Hiei, Y. Takahashi, S. B. Kim, K. Matsumoto, H. Ikuta,
 U. Mizutani, and I. Hirabayashi, "Preparation of Biaxially Aligned
 YBa2Cu3O7-d Film on CeO2 Buffered MgO by Chemical Solution Deposition."
 To be published in Physica C. Superconductivity Research Laboratory,
 International Superconductivity Technology Center (ISTEC), Div. V, 2-4-1
 Mutsuno, Atsuta-ku, Nagoya 456-8587, JAPAN; telephone +81 52 871 4002;
 telefax +81 52 871 4090; e-mail <a href="mailto:yamagiwa@istec.or.jp">yamagiwa@istec.or.jp.</a> Key words: Y123
 films, chemical-solution deposition, YSZ, CeO2, buffer, in-plane
 alignment.
<p>
 Z. Zhai, C. Kusko, N. Hakim, and S. Sridhar, "Precision Microwave
 Dielectric and Magnetic Susceptibility Measurements of Correlated
 Materials Using Superconducting Cavities." Department of Physics,
 Northeastern University, 360 Huntington Avenue, Boston, MA 02115; e-mail
 <a href="mailto:zzhai@sagar-3.physics.neu.edu">zzhai@sagar-3.physics.neu.edu</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/0001280">http://xxx.lanl.gov/abs/cond-mat/0001280.</a>
<p>
 <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>
 March 27 - 30, 2000: 7th International Symposium on Trends and
 Applications of Thin Films (TATF'2000), Nancy, France. Organized by the
 French Vacuum Society. Will focus on the newest trends and applications
 of thin films -- super-hard and complex coatings; thin films for
 sensors; surface characterization and process control; and
 nanostructures, multifunctional coatings, and optoelectronics. Short
 courses will include plasma processes for film growth, stress formation
 in thin films, and characterization methods. Exhibition of related
 equipment and services. Contact SFV/ref TATF2000, 19 rue du Renard, F-
 75004 Paris, France; telephone +33 1 53 01 9030; telefax +33 1 42 78
 6320; e-mail <a href="mailto:sfv@vide.org">sfv@vide.org</a> Web site <a href="http://vide.org/tatf2000.htm">http://vide.org/tatf2000.htm.</a>
<p>
 *June 20 - 22, 2000: 11th International Cryocooler Conference (ICC11),
 Keystone Resort and Conference Center, Keystone, Colo. Technical
 program will consist of oral and poster sessions. Invited technical
 topics include Stirling and Pulse-Tube cryocoolers, J-T and G-M
 cryocoolers, new cryocooler concepts, cryocooler component developments,
 modeling and test techniques, performance and life test data,
 applications and integration issues, space flight cryocoolers, and low
 cost cryocoolers. Oral and poster sessions. For information, contact
 Rodney L. Oonk, ICC11, Ball Aerospace Systems Division, P.O. Box 1062,
 Boulder, CO 80306-1062; telephone (303) 939-4449; telefax (303) 939-
 6307; e-mail <a href="mailto:iccchair@cryocooler.org">iccchair@cryocooler.org.</a>
<p>
 *July 23 - 25, 2000: International Symposium on Local Lattice
 Distortions (LLD2K), AIST Tsukuba Research Center, Ibaraki, Japan.
 Intensive discussions on physics related to local lattice distortions,
 with the aim of establishing its role in exotic properties of strongly
 correlated systems such as high-Tc superconductivity, colossal
 magnetoresistance, and related topics. Topics include local lattice
 distortions associated with stripes, charge and orbital ordering,
 lattice anomalies, phase transitions, excited states, and impurities.
 For further information, contact LLD2K Secretariat, Electrotechnical
 Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki, 305-8568, Japan; telephone
 +81 298 54 5072; telefax +81 298 54 5085; e-mail <a href="mailto:lld2k@etl.go.jp">lld2k@etl.go.jp</a> Web
 site <a href="http://www.etl.go.jp/~lld2k/">http://www.etl.go.jp/~lld2k/.</a>
<p>
 Sept. 25 - 30, 2000: Third International Conference on Stripes and
 high-Tc superconductivity (STRIPES2000), University of Rome "La
 Sapienza," Rome, Italy. Follows previous conferences held during Dec.
 1996 and June 1998. Intends to bring together active researchers in the
 field of stripes and high-Tc superconductivity in order to discuss the
 latest experimental and theoretical developments, and implication of the
 stripe phenomena to the future technology. Main topics include stripes
 formation in perovskites, pairing and stripes, advanced experiments for
 probing stripe phases, and superconductivity in low dimensions. Meeting
 will cover various aspects of natural and artificial stripes and charge-
 ordering phenomena in the cuprates, manganites, nickelates, and other
 related materials. Topics include stripes in a doped antiferromagnetic
 lattice, stripes in a polarized electron gas, coexistence of stripes and
 superconductivity, polaron ordering and lattice-charge instabilities,
 stripes and Wigner metal-insulator transitions, pairing-mediated by spin
 fluctuations, pairing-mediated charge fluctuations, superconducting
 fluctuations in striped phases, superconductivity in mesoscopic metals,
 superlattice of quantum stripes, and mechanisms for Tc amplification.
 Various experimental techniques to probe the stripes will be discussed,
 which include neutron, electron, and x-ray scattering; NMR/NQR, muSR,
 and high-frequency probes; x-ray and optical spectroscopy; and
 photoemission. The scientific program of the conference will include
 invited and contributory talks and some poster presentations. Abstract
 deadline, May 30, 2000; preregistration deadline, June 15, 2000.
 Conference chair: Antonio Bianconi. For information, contact Anna De
 Grossi, Conference Secretary, Piazzale Aldo Moro 2, I-00185 Rome, Italy;
 telephone +39 06 49914343; telefax +39 06 49914387; Web site
 <a href="http://www.bianconi.net">http://www.bianconi.net.</a>
 <hr>
<p>
 FYI
 (High-Tc Update takes no responsibility for want ads listed in this
 section.)
<p>
 Position open: BICC General Superconductors is seeking a Senior
 Scientist/Engineer to work in its superconductivity group. The
 successful applicant will be responsible for the advanced development of
 Bi-2223 tapes and research into new, cost-effective, high-current
 conductors with lower ac losses. Candidates should have at least two
 years of experience in the materials and engineering aspects of super-
 conductors. Ideally, they will have a Ph.D. in a related subject and
 experience in processing of Bi-2223 tapes. Applicants must be fluent in
 English, have a good record of scientific publications, be able to work
 effectively within a small team, and possess excellent interpersonal and
 project management skills. BICC General Superconductors is a commercial
 supplier of Bi-2223 tapes and HTS current leads. Financial support for
 relocation will be available to the right candidate. Applications
 should be made in writing (or e-mail), including full C.V. and salary
 details, to Linda Bunkell, Administration Manager, BICC General UK
 Cables Ltd. Technology, Wrexham LL13 9XP, United Kingdom; e-mail
 <a href="mailto:lbunkell@biccgeneral-eu.com">lbunkell@biccgeneral-eu.com</a>. For further information about the
 vacancy, contact Chris Friend, Technical Manager, phone +44 1978
 662612; e-mail <a href="mailto:cfriend@biccgeneral-eu.com">cfriend@biccgeneral-eu.com</a> Web site www.bicc-sc.com.
<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:
<p>
 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. 14, #5, March 1, 2000.
 <hr>