HIGH-Tc UPDATE E-MAIL VERSION, VOL. 14, NO. 1, Jan. 1, 2000.
<p>
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<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>
 PLEASE READ: The electronic-mail version of High-Tc Update is generated
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 <hr>
<p>
 NOTA BENE: Wishing you happy holidays and best wishes for a bright and
 prosperous new year! From Sreeparna, John, Charyl, Barb, and Lina--the
 High-Tc Update editors and staff.
<p>
 Coated Conductors
<p>
 As reported in a preprint by R. A. Hawsey et al. (Oak Ridge), two new
 processes have been under development since 1991 that promise a new,
 cost-effective way to manufacture flexible high-current-density wire
 made from YBa2Cu3O7-d (YBCO). The key is to prepare a textured
 substrate or template, on which the YBCO may be deposited as a biaxially
 aligned thick film. Ion-beam-assisted deposition (IBAD) of yttria-
 stabilized zirconia (YSZ) or MgO on alloy tapes enables a final
 superconducting layer with grain-to-grain in-plane alignment to within 3
 to 5 degrees. Similar results are achieved on rolling-assisted
 biaxially textured substrates (RABiTS) using a variety of oxide layers
 on textured nickel tapes. The performance of research lengths of
 prototype wires in strong magnetic fields at 65 K already exceeds that
 of NbTi and Nb3Sn in liquid helium. Values of critical current density
 Jc consistently greater than 1 x 10^6 A/cm^2 in self-field at 77 K are
 now obtained on RABiTS, and Jcs in excess of 2 x 10^6 A/cm^2 have been
 obtained on both substrates. A nonmagnetic variation of RABiTS (Ni-13%
 Cr) has also been shown to yield Jc greater than 1.5 x 10^6 A/cm^2. Six
 private companies in the U.S. (3M, American Superconductor Corporation,
 EURUS Technologies, Intermagnetics General Corporation, MicroCoating
 Technologies, and Oxford Superconducting Technology) are scaling up YBCO
 coated conductors for power and physics applications.
<p>
 A preprint by D. T. Verebelyi (Oak Ridge) et al. also describes efforts
 towards the development of second-generation high-temperature-
 superconducting wires based on buffered metallic tape substrates with
 nearly single-crystal texture. Previous work had shown that strong
 alignment of adjacent grains was necessary and that large-angle YBCO
 [001]-tilt boundaries reduce Jc exponentially with increasing
 misorientation angle theta. In this preprint, the authors pursued the
 low-theta regime by evaluating single grain boundaries and biaxially
 aligned polycrystalline films on both RABiTS and IBAD coated-conductor
 architectures. The authors found that an exponential dependence on Jc
 is applicable for theta >= 4 degrees, where the spacing between the
 periodic disordered regions along the grain boundary becomes smaller
 than a coherence length. Magnetic-field measurements revealed that
 single grain boundaries are less sensitive to substantial fields than
 their adjacent grains, although the overall Jc values are lower.
<p>
 The electromagnetic connectivity and microstructure of three YBCO films
 grown on biaxially textured substrates have been investigated by C.-Y.
 Yang (Wisconsin-Madison) et al. using magneto-optical (MO) imaging and
 scanning electron microscopy (SEM). The films were deposited by pulsed-
 laser deposition (PLD) on YSZ- and CeO2-buffered biaxially textured Ni
 tapes. The transport critical current density (Jc) values of the films
 were 3, 6, and 7 x 10^5 A/cm^2 at 77 K and 0 T. MO imaging revealed
 clearly granular electromagnetic behavior in the samples with the lowest
 and highest Jc, but considerably better connectivity in the sample with
 Jc = 6 x 10^5 A/cm^2. High-resolution SEM showed a dense and rather
 featureless microstructure in the YBCO of the most highly
 electromagnetically connected sample, whereas pores and/or second-phase
 particles cluttered the YBCO layers of the granular samples. Thus, the
 granular behavior in these samples appears to be caused by pores and
 second-phase particles that locally obstruct the supercurrent in the
 YBCO layer. Control of these types of defects clearly is important for
 raising the Jc values.
<p>
<p>
 RBa2Cu3O7-d
<p>
 Grain-growth kinetics and microstructure evolution in YBa2Cu3O7-d (Y-
 123) ceramics have been studied by M. F. Imayev et al. (Ufa) during
 isothermal annealing over the temperature range 875-975^oC. The authors
 established that grain growth begins near 900^oC and that it correlates
 with the temperature of appearance of a liquid phase at grain boundaries
 as a result of double (e_1) and/or threefold (e_2) eutectic reactions.
 Only plate-like grains nucleate and grow, which results in
 transformation of the initial equiaxed microstructure to a plate-like
 one.
<p>
 Microstructural and spectroscopic analyses of a strongly linked (melt-
 joined) seam between two Y-123 superconducting pieces are reported by S.
 M. Mukhopadhyay (Wright State) et al. When a large domain of Y-123 was
 cut and mechanically joined, the zero-distance levitation force was
 reduced to 70% of the original value. On the other hand, when
 identically cut pieces were joined using a lower-melting-point
 superconducting powder (Yb-123) as solder, 92% of the original value of
 the zero-distance levitation force was obtained. The authors also
 investigated the microstructural characteristics of the interface using
 SEM, energy-dispersive analysis of x-rays (EDAX), and x-ray
 photoelectron spectroscopy (XPS).
<p>
 Four papers by H. S. Chauhan and M. Murakami (SRL-ISTEC) report advances
 in the superconducting properties of melt-textured Nd-123, (Nd-Y)-123,
 and Gd-123. In one of these papers, the authors report a new hot-
 seeding method for growing single-grain Nd-123 in a controlled-oxygen
 environment. Using Nd-123 seed crystals, the authors were able to grow
 large single-domain c-axis-oriented samples with top surface area larger
 than 3 cm x 3 cm. Magnetic measurements showed high Tc and Jc values in
 specimens selected from these samples.
<p>
 MeV He-ion channeling has been used by R. P. Sharma (Maryland) et al. to
 investigate lattice fluctuations in YBCO. The authors found that the
 incoherent lattice fluctuations show significant phase transitions as a
 function of temperature. The observed transitions are consistent with
 the electric and magnetic phase evolution as predicted by the stripe-
 phase model. Transitions are seen at temperatures corresponding to (a)
 stripe formation, (b) spin-gap and pair formation, and (c) the onset of
 superconductivity.
<p>
 Results of x-ray absorption near edge spectra (XANES), neutron powder
 diffraction, and resonant x-ray diffraction on samples of PrBa2Cu3O7-d
 (Pr-123) and Pr1-xCaxBa2Cu3O7-d are reported by U. Staub (PSI-Villigen)
 et al. The data were obtained as a function of the doping levels of O
 and Ca. The authors found significant changes in the Pr L_3 XANES
 spectra with changes in O or Ca concentrations, indicating that the Pr
 electronic properties are affected by doping. The authors used a
 quantitative model to extract Pr valences from the data, although XANES
 cannot distinguish between models involving charge transfer from those
 involving hybridization.
<p>
<p>
 Bi Cuprates
<p>
 A preprint by N. Morozov (Los Alamos) et al. reports measurements of the
 c-axis resistivity rho_c(H) in Bi2Sr2CaCu2O8+d (Bi-2212) in quasistatic
 magnetic fields up to 60 T. Plots of rho_cvs H exhibit temperature-
 dependent peaks. The authors describe this field dependence in terms of
 tunneling of Cooper pairs and quasiparticles in a d-wave superconductor;
 the maximum in rho_c(H) arises from the competition between these two
 conduction channels below H_[c2]. The low-T saturation of the high-
 field rho_c(T) is a consequence of the d-wave character of the
 superconducting state. The authors find that the quasiparticle
 conductivity sigma_q(H) is linear in H and remains small up to 60 T. It
 becomes gradually weaker and superlinear above Tc, where the
 quasiparticle tunneling is controlled by the pseudogap.
<p>
 The normal-state electronic excitations in Bi1.6Pb0.4Sr2CuO6 (Bi-2201)
 and Bi2Sr2CaCu2O8+d (Bi-2212) have been studied by J. Mesot (Argonne and
 Illinois-Chicago) et al. using angle-resolved photoemission spectroscopy
 (ARPES). The authors' main goal was to establish explicit criteria for
 determining the Fermi surface from ARPES data on strongly interacting
 systems where sharply defined quasiparticles do not exist and the
 dispersion is very weak in parts of the Brillouin zone. Additional
 complications arise from strong matrix-element variations within the
 zone. The authors conclude that, despite all the complications, the
 Fermi surface can be determined unambiguously: it is a single large
 hole barrel centered about (pi,pi) in both Bi-2201 and Bi-2212.
<p>
 Melting relations of Bi-2212 at oxygen fugacities f(O2) in the range (1-
 3) x 10^[-4] bar are presented by J. K. Meen et al. (TCSUH). The
 authors analyze the results to interpret phase relations in the Bi-Sr-
 Ca-Cu-O system.
<p>
 As noted in a preprint by M. L. Carvalho et al. (TCSUH), a prerequisite
 to understanding phase equilibria of the quaternary system Bi2O3-SrO-
 CaO-CuO is an adequate definition of phase relations in the bounding
 binary and ternary systems. To this end, the authors studied the
 melting relations of Bi2O3-CaO-CuO at 1 atm of O2, and they report these
 in their paper.
<p>
 A lamination process that improves the mechanical properties of Ag-clad
 Bi-2223 tapes without degrading the transport critical current I_c has
 been developed by M. Lelovic (Argonne) et al. Tapes were laminated by
 soldering fully reacted Bi-2223/Ag tapes to a thin, hard yellow brass
 foil (YBH04). When a tensile stress of about 60 MPa was applied to the
 laminated tape, the I_c was fully retained, but when a stress of about
 20 MPa was applied to a tape with no lamination, I_c decreased by about
 60%.
<p>
<p>
 Other Cuprates
<p>
 As reported by E. Bellingeri et al. (Geneva), a new superconducting
 phase, Bi2Sr2Ca2Cu3O8F4, has been obtained by fluorination of standard
 Bi-2223 at moderate temperatures (250-300^oC) using NH4HF2 as the
 fluorine source. The presence of F in this new phase was confirmed by
 EDAX. Furthermore, x-ray and neutron-diffraction experiments showed
 that F atoms replace O atoms in the BiO layers in the ratio 2:1. The
 additional anions form a square-mesh layer between neighboring BiF
 layers. The incorporation of F increases the crystallographic c-axis
 parameter by ~1.8 Angstroms (a = 5.409 Angstroms, b = 5.407 Angstroms, c
 = 38.792 Angstroms). The CuO2 layers remain undistorted, but the
 distance from the Cu atom to the apical oxygen atom of the square
 pyramids is decreased to 2.27 Angstroms from 2.42 Angstroms in Bi-2223.
 A superconducting transition temperature of 75 K was determined from
 magnetic susceptibility measurements. When applied to Bi-2212, the same
 fluorination process produced the new phase Bi2Sr2CaCu2O6F4 with similar
 structural features.
<p>
 The in-plane penetration depth lambda(T) has been measured in electron-
 doped single crystals of Nd1.85Ce0.15CuO4-x (NCCO) and Pr1.85Ce0.15CuO4-
 x (PCCO) by R. Prozorov (Illinois-Urbana) et al. using an 11 MHz LC
 resonator. In NCCO, lambda(T) exhibits a minimum at 3.8 K and a
 pronounced upturn down to 0.4 K due to the paramagnetic contribution of
 Nd^[3+] ions. The London penetration depth contribution is linear in T.
 The paramagnetic contribution is absent in PCCO, where lambda(T) ~ T^2
 at low temperatures. The results indicate the presence of nodes in the
 superconducting gap, i.e., non-s-wave symmetry of the order parameter in
 the electron-doped cuprates.
<p>
 A paper by A. Mourachkine (Brussels) discusses the Q-integrated
 inelastic neutron-scattering data and data obtained at the
 antiferromagnetic vector Q_[AF] = (pi,pi) in La2-xSrxCuO4 (La-214),
 YBa2Cu3O7-d (Y-123), and Bi2Sr2CaCu2O8+d (Bi-2212). The author
 interprets the results in terms of two order parameters, which have
 different dependencies upon the hole concentration: Delta_c, the
 magnitude of the coherent order parameter, and Delta_p, the magnitude of
 the pairing order parameter.
<p>
 The effects of different argon or oxygen annealing routes upon the
 ferromagnetic transition in polycrystalline single-phase RuSr2GdCu2O8
 (Ru-1212) have been studied by R. W. Henn et al. (MPI-Stuttgart). The
 x-ray patterns and ferromagnetic transition temperatures remained nearly
 the same in all samples, independent of the annealing procedure used.
 None of the investigated samples showed any trace of superconductivity
 down to 2 K. The authors conclude that the absence of superconductivity
 in these samples cannot be due to a variation of the oxygen content in
 the RuO layers.
<p>
 The 3D XY model has been used by J. Hofer (Zurich) et al. to scale
 angular-dependent magnetic torque measurements on single crystals of
 HgBa2CuO4+d (Hg-1201), La2-xSrxCuO4 (La-124), and YBa2Cu3O6.93 (Y-123)
 and to determine the scaling function dG^[+-](z)/dz describing the
 universal critical properties near Tc. A systematic shift of the
 scaling function with increasing effective mass anisotropy gamma =
 (m_c*/m_[ab]*)^[1/2] was observed, which the authors explain in terms of
 a 3D-2D crossover. Further evidence for a 3D-2D crossover was found
 from temperature-dependent torque measurements, carried out in different
 magnetic fields at different field orientations d, which show a quasi-2D
 crossing region in the magnetization vs temperature (M*,T*). The
 crossing temperature T* was found to be angular-dependent. Torque
 measurements above Tc revealed that fluctuations are strongly enhanced
 in the underdoped region where the anisotropy is large, whereas they are
 less important in the overdoped regime.
<p>
<p>
 Vortices
<p>
 Neutron-scattering studies of optimally doped single-crystal YBa2Cu3O7-d
 (Y-123) under an applied magnetic field have been used by D. Vaknin et
 al. (Ames Lab, Iowa State) to assess the possibility of the existence of
 antiferromagnetic (AF) correlations in the vortex core. In the
 superconducting state, a very weak signal at the (1/21/20) reciprocal
 lattice point was found. The authors argue that this signal can be
 associated with AF correlations in the vortex cores, and the authors
 estimate an upper-limit average magnetic moment per vortex in each
 layer. Above Tc, weak paramagnetic scattering was observed, which the
 authors hypothesize is due to scattering from nearest-neighbor copper
 spins that are coupled ferromagnetically by a hole on an oxygen site
 between them.
<p>
 The melting line of the pancake-vortex system in a layered
 superconductor, interpolating between two-dimensional melting (2D) at
 high fields and the zero-field limit of single-stack evaporation, has
 been calculated by M.J.W. Dodgson (ETH-Zurich) et al. Long-range
 interactions between pancake vortices in different layers permit a mean-
 field approach, the substrate model, where each 2D crystal fluctuates in
 a substrate potential due to the vortices in the other layers. The
 authors find the thermal stability limit of the 3D solid, and compare
 its free energy with that of a 2D liquid to determine the first-order
 melting transition and its jump in entropy.
<p>
<p>
 Films
<p>
 A preprint by K. Yamagiwa and I. Hirabayashi (SRL-ISTEC) reports the
 preparation of RBa2Cu3O7-d (RBCO, R = Yb, Er, Y, Gd, Sm, Nd, Pr, and La)
 by chemical-solution-deposition (CSD) processing using metal
 naphthenates under low oxygen partial pressures. The authors
 investigated process-temperature and ionic-radius dependencies of the
 preferred orientation axis (c-axis or a-axis growth) of RBCO films
 deposited on SrTiO3, LaAlO3, and MgO substrates. RBCO films prepared on
 MgO substrates showed c-axis orientation for all R elements, but in-
 plane alignment of these films tended to be obtained for higher
 temperatures for increasing ionic radius of R. For R = Er, Y, Gd, and
 Sm on SrTiO3, a/b-axis-oriented films were obtained at low temperatures,
 whereas only c-axis films were obtained at all temperatures for R = Yb,
 Nd, Pr, and La films. On the other hand, RBCO films prepared on LaAlO3
 were found to have a/b-axis orientation at low temperatures, except for
 R = Yb. The processing-temperature and substrate dependencies of these
 films grown by solid-phase epitaxy were found to be the same as for
 films grown by vapor-phase epitaxy. The dependencies on the ionic
 radius of the R atoms could be explained in terms of lattice misfit.
<p>
<p>
 Applications
<p>
 The magnetic-field dependence of single-layer washer-type high-Tc YBCO
 rf SQUIDs with grain-boundary Josephson junctions, as well as low-Tc Nb
 rf SQUIDs with Nb-Al2O3-Nb tunnel junctions, has been investigated by E.
 Il'ichev (Jena) et al. The authors found that the suppression of the
 critical current of the Josephson junction due to the magnetic field
 leads to a modulation of the amplitude of the SQUID output signal. The
 role of the unwanted junction in high-Tc rf SQUIDs, which is formed by
 the grain boundary running through the washer of the SQUIDs on bicrystal
 substrates, also has been clarified; penetration of the magnetic field
 into the unwanted junction causes a drop in the SQUID signal. The
 authors used these results to develop a direct radio-frequency method
 for the determination of the first critical field H_[c1] in long
 Josephson junctions.
<p>
 A transition-edge infrared (IR) detector using a YBCO thin film
 deposited on a chemically etched 7 micrometers thick sapphire substrate
 has been fabricated by B. Lakew (NASA/Goddard Space Flight Center) et
 al. A 30 micrometers layer of gold black provided IR absorption. The
 peak optical detectivity obtained was 1.2 x 10^[10] cm Hz^[1/2] W^[-1]
 near 4 Hz. The results show that it is possible to obtain high
 detectivity with thin films on etched sapphire with no processing after
 the deposition of the YBCO film. The authors discuss the etching
 process and its potential for micromachining sapphire and fabricating
 two-dimensional detector arrays with suspended sapphire membranes.
<p>
 An expression for the loss in untwisted, aspected strands (aspect ratio
 a/b) has been used by M. D. Sumption (Ohio State) et al. to extract the
 effective transverse matrix resistivity rho_[parallel] of NbTi/Cu and
 Bi-based multifilamentary strands with low numbers of filaments in
 coarse arrays. The rho_[parallel] values were significantly higher than
 expected for both strand types by factors of from five to ten. The
 authors attribute this to filament-array coarseness and geometry, and
 they predict this effect to be much more noticeable for untwisted than
 for twisted tapes. The authors also give a loss equation for the
 special case of twisted tapes with resistive cores. Here the loss is
 estimated to be about a/b times lower than the uncored case.
<p>
<p>
 Theory
<p>
 A preprint by Z. Y. Weng et al. (TCSUH) explores quasiparticle
 properties in an effective theory of the t-J model that includes two
 important components: spin-charge separation and an unrenormalizable
 phase shift. The authors show that the phase-shift effect indeed causes
 the system to be a non-Fermi liquid, as conjectured by Anderson on
 general grounds. However, this phase shift also drastically changes a
 conventional perception of quasiparticles in a spin-charge-separation
 state: an injected hole will remain stable because of spin and holon
 confinement by the phase-shift field even though the background is a
 spinon-holon sea. True deconfinement happens only in the zero-doping
 limit, where a bare hole loses its integrity and decays into holon and
 spinon elementary excitations.
<p>
 As shown by M. Calandra and S. Sorella (Trieste), the two-dimensional t-
 J model with J/t = 0.4 reproduces the main experimental qualitative
 features of high-Tc cuprate superconductors: d-wave superconducting
 correlations are strongly enhanced for small doping, and off-diagonal
 long-range order is found at the optimal doping d ~~ 0.15. On the other
 hand, antiferromagnetic long-range order, clearly present at zero hole
 doping, is suppressed at small hole density, with a clear absence of
 antiferromagnetism at d > 0.1.
<p>
 Impurity substitution of Zn in La-214 and (Y,Ca)-123 high-Tc
 superconductors suppresses Tc but does not appreciably affect (a) the
 onset of the pseudogap phase in the underdoped region, (b) the optimal
 doping level, or (c) the position of the inferred quantum critical
 point. Using a 1/N expansion of the t-J model, E. Cappelluti and R.
 Zeyher (MPI-Stuttgart) explain these findings, as well as a similar
 dependence on magnetic field, in terms of a quantum-critical-point
 scenario, where a flux phase causes the pseudogap.
<p>
 Cooper-pair phase fluctuations in cuprate superconductors have been
 studied by D. Manske (Freie Universitaet Berlin) et al. assuming a spin-
 fluctuation pairing interaction. Using an electronic theory, the
 authors calculate for underdoped cuprate superconductors the superfluid
 density n_s(T), the superconducting transition temperature Tc(x)
 proportional to n_s(0), below which phase-coherent Cooper pairs occur,
 and Tc*(x), above which phase-incoherent Cooper pairs disappear. The
 authors also present results for the penetration depth lambda(x,T) (x =
 doping) and the weak pseudogap temperature T*(x), below which a gap
 structure occurs in the spectral density. A Meissner effect is obtained
 only for T < Tc. The authors also find that fluctuations become
 increasingly important in the underdoped regime and lead to a reduction
 in Tc, in good agreement with experiment.
<p>
 The effects of impurities in time-reversal symmetry (T) breaking
 superconductors have been studied by Y. Okuno using the Bogoliubov-de
 Gennes equations. In T-violating superconductors, spontaneous currents
 are induced around the impurity, and the current patterns around the
 impurity reflect the structure of the Cooper pairs.
<p>
 The Keldysh representation of the functional integral for an interacting
 electron system with disorder has been used by M. V. Feigel'man (Landau
 Institute) et al. to derive microscopically an effective action for
 dirty superconductors. This approach reproduces, without the use of the
 replica trick, the well-known result for the Coulomb-induced
 renormalization of the electron-electron coupling constant in the Cooper
 channel. The authors also calculate new results for (a) the subgap
 Andreev conductance between a superconductor and a 2D dirty normal metal
 and (b) the Josephson proximity coupling between superconductive islands
 via a 2D dirty normal metal.
<p>
 Using a new description of high-temperature superconductors in terms of
 dynamical symmetries associated with an SU(4) algebra, Y. Sun
 (Tennessee) et al. obtain multiple energy scales corresponding to
 multiple energy gaps in the cuprates. The authors show that the
 dependence of the gaps on hole doping is completely dictated by the
 symmetry, and this leads to new mechanisms for forming or suppressing
 superconducting order that are conceptually different from the simple
 pairing mechanism in conventional BCS theory. The authors compare their
 predictions with available data and suggest further experiments to
 identify these gaps.
<p>
 As noted in a preprint by N. D. Whelan and J. P. Carbotte (McMaster),
 among high-Tc materials, the YBCO compounds are special because they
 have superconducting chains as well as planes. The authors show that a
 discontinuity in the density of states as a function of magnetic field
 may appear at a new energy scale that is characteristic of the chain and
 distinct from the energy scale set by the d-wave gap. The authors
 discuss how this new energy scale can be observed in experimental
 studies of thermodynamic properties such as the specific heat.
<p>
 The effect of intrinsic doping inhomogeneity and the presence of stripes
 in high-Tc superconductors on the coupling lambda has been analyzed by
 V. V. Moshchalkov and V. A. Ivanov (Leuven) using a simple analytically
 solvable model with an angular dependent lambda(phi) represented by a
 square-well form. The authors found that introducing a Coulomb
 repulsion lambda_C, increasing the value of |lambda| + |lambda_C|, or
 increasing the depth of the angular modulation of lambda(phi) leads to a
 remarkable enhancement of Tc. This effect can be optimized by combining
 attractive (lambda < 0) and repulsive (lambda > 0) interactions along
 stripes and perpendicular to them.
<p>
 The dynamic critical properties of chiral-glass ordering have been
 studied by H. Kawamura (Osaka) using Monte Carlo simulations and
 dynamical scaling analysis. The author emphasizes that the chiral-glass
 state is a new zero-field phase of superconductors, being made possible
 by the anisotropic nature of the pairing symmetry of the cuprate
 superconductors. The author also shows that recent magnetic and
 transport measurements on YBCO high-Tc ceramics are consistent with the
 chiral-glass picture.
<p>
<p>
 Overviews
<p>
 Problems in using the low-temperature asymptotics to determine the
 order-parameter symmetry are discussed in an overview by A. M. Gabovich
 and A. I. Voitenko (Kiev). The authors show that a model of a
 conventional s-wave superconductor involving statistical averaging over
 a spatially dependent gap parameter Delta can mimic the behavior of a d-
 wave superconductor. However, the power-law low-T asymptotics obtained
 in this model do not rule out the existence of d-wave superconductivity
 in the high-Tc oxides (138 refs.).
<p>
 The growth-related microstructure of melt-grown RBa2Cu3O7-d (R-123, R =
 Y, Nd, Sm, Eu, and Gd) bulk superconductors is reviewed in a preprint by
 P. Diko (Kosice). The solidification process introduces defects into
 the R-123 bulks, thereby influencing the overall superconducting and
 mechanical properties of fabricated tiles. The most important
 microstructural features related to the growth process are subgrain
 boundaries and macroscopic inhomogeneities in the concentration of
 R2BaCuO5 (R-211) particles (58 refs.).
<p>
 Experimental evidence, based on the ac and dc magnetic response, for a
 generic phase diagram for weakly pinned superconducting systems is
 presented in an overview by S. S. Banerjee (TIFR-Mumbai) et al. The
 phase diagram comprises quasiglassy phases (the Bragg glass, a vortex
 glass, and a reentrant glass) and completely amorphous pinned and
 unpinned phases. The characteristic metastability and thermomagnetic
 history-dependent features seen in the various glassy phases suggest
 close connections between vortex matter and other disordered condensed
 matter systems such as spin glasses, supercooled liquids, and structural
 glasses (55 refs.).
<p>
 A history of the creation of the microscopic theories of superfluidity
 (1947) and superconductivity (1957) has been prepared by P. N. Bogolubov
 and P. S. Isaev (JINR-Dubna). The work commemorates the 90th
 anniversary of the birth of N. N. Bogoliubov (in Russian, no refs.).
<p>
<p>
 Contributed by John R. Clem
 <hr>
<p>
<p>
 Contents: Technology News is on page 6; Preprints begin on page 7;
 Coming Events begin on page 11; Resources begin on page 12; 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 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>
 As part of a major South Korean fusion reactor project, Intermagnetics
 General Corporation (IGC) has been awarded a $1 million contract to
 supply additional superconducting material for powerful magnets.
 Delivery of the Nb3Sn material is scheduled to begin in spring 2000.
 The purchase by Samsung Advanced Institute of Technology, which is a key
 participant in the Korean National Fusion Project and oversees its
 Korean Superconducting Tokamak Advanced Research project, is the second
 major order placed with Intermagnetics' IGC-Advanced Superconductors
 Division.
<p>
 In other news from the company, the largest power-utility-size fault
 current controller recently completed a testing cycle at a Southern
 California Edison (SCE) substation in Norwalk, Calif. The innovative
 FCL device, which is expected to benefit the nation's utility industry,
 incorporates three record-size high-temperature superconducting coils
 manufactured by IGC. The company participated on a team led by General
 Atomics, which designed and built a pre-commercial 15 kV-class
 superconducting current controller under the auspices of a U.S.
 Department of Energy (DOE) Superconductivity Partnership Initiative
 (SPI) program. The fault current controller is one of several potential
 applications of HTS technology which IGC is seeking to commercialize.
 Others include transformers and power transmission cables.
<p>
 For further information, contact Glenn H. Epstein or Cathy Yudzevich,
 Intermagnetics General Corporation, telephone (518) 782-1122.
<p>
 Recently, Pirelli Cables and Systems made a new agreement by which it
 will provide up to $13.8 million in additional funding to American
 Superconductor for the development of HTS wires for use in power cables.
 HTS power cables are expected to carry up to five times the amount of
 power as copper cables of the same size. The companies also announced
 the signing of an agreement to exploit HTS wire for use in fault current
 limiters. The new HTS wire-development program focuses on further
 improvements in American Superconductor's currently available commercial
 HTS wire as well as on the development of a next-generation wire
 technology. Pirelli has designed and commissioned a dedicated HTS cable
 manufacturing line, and has also demonstrated key components of HTS
 cable systems for power transmission and distribution networks. For
 information, contact Kevin Coates, American Superconductor Corporation,
 Two Technology Drive, Westborough, MA 01581; telephone (202) 434-8308;
 e-mail <a href="mailto:kcoates@amsuper.com">kcoates@amsuper.com.</a>
<p>
<p>
 Contributed by Sreeparna Mitra
 <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>
 P. Badica and G. Aldica, "Phase Formation During Non-Isothermal
 Decomposition of the Freeze Dried
 Bi:Pb:Sr:Ba:Ca:Cu=1.8:0.4:1.8:0.2:1.2:2.0 Complex Nitrate Powder." To
 be published in J. Supercond. National Institute of Materials Physics,
 P.O. Box MG-7, Bucharest-Magurele, R-76900 ROMANIA; telefax +40 1 4930
 267; e-mail <a href="mailto:badpet@alpha1.infim.ro">badpet@alpha1.infim.ro.</a> Key words: non-isothermal
 decomposition, freeze-dried powder, Bi(Pb)-Sr(Ba)-Ca-Cu-O system, x-ray
 diffraction.
<p>
 P. Badica, G. Aldica, M.-C. Bunescu, and A. V. Nemyrovsky, "Studies
 Concerning Secondary Synthesis Processes in [Bi(Pb)]2[Sr(Ba)]2Ca2Cu3Oy
 Freeze Dried Superconducting Ceramic." To be published in J. Mater.
 Sci. Lett. National Institute of Materials Physics, P.O. Box MG-7,
 Bucharest-Magurele, R-76900 ROMANIA; telefax +40 1 4930 267; e-mail
 <a href="mailto:badpet@alpha1.infim.ro">badpet@alpha1.infim.ro.</a>
<p>
 Satyajit Sukumar Banerjee, Srinivasan Ramakrishnan, Dilip Pal, Shampa
 Sarkar, Arun Kumar Grover, Gurazada Ravikumar, Prasant Kumar Mishra,
 Turumella Venkata Chandrasekhar Rao, Vinod Chandra Sahni, Chakkalakal
 Varduuny Tomy, Mark Joseph Higgins, and Shobo Bhattacharya, "Magnetic
 Phase Diagram of Weakly Pinned Type-II Superconductors." Preprint
 #TIFR/CM/99/601(I); to be published in J. Phys. Soc. Jpn.: Proc. of the
 Frontiers in Magnetism Workshop, Kyoto, Japan, Oct. 4-7, 1999.
 Department of Condensed Matter Physics and Material Science, Tata
 Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai
 400005, INDIA; e-mail <a href="mailto:sb@tifr.res.in">sb@tifr.res.in;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9911324">http://xxx.lanl.gov/abs/cond-mat/9911324.</a> Key words: magnetic phase
 diagram, type-II superconductors, peak-effect phenomenon, ordered and
 disordered phases, history effects.
<p>
 E. Bellingeri, G. Grasso, R. E. Gladyshevskii, M. Dhalle, and R.
 Fluekiger, "New Bi-Based High-Tc Superconducting Phases Obtained by Low-
 Temperature Fluorination." To be published in Physica C (in press).
 Departement de Physique de la Matiere Condensee (DPMC), Universite de
 Geneve, 24 Quai Ernest-Ansermet, CH-1211 Geneve 4, SWITZERLAND;
 telephone +41 22 7026 078; telefax +41 22 7026 869; e-mail
 <a href="mailto:bellinge@sc2a.unige.ch">bellinge@sc2a.unige.ch.</a> Key words: Bi(2223), fluorine, crystal
 structure. 74.62.Bf.
<p>
 P. N. Bogolubov and P. S. Isaev, "50 Years of Creation of Microscopic
 Theory of Superfluidity (1947); 40 years of Creation of Microscopic
 Theory of Superconductivity (1957)." Preprint #P17-99-160. Publishing
 Department, Joint Institute for Nuclear Research, Joliot-Curie 6, 141980
 Dubna, Moscow Region, RUSSIA; telephone +7 09621 65834; e-mail
 <a href="mailto:publish@pds.jinr.dubna.su">publish@pds.jinr.dubna.su.</a>
<p>
 Matteo Calandra and Sandro Sorella, "From Antiferromagnetism to d-Wave
 Superconductivity in the 2D t-J Model." Istituto Nazionale di Fisica
 della Materia and International School for Advanced Studies, Via Beirut
 4, I-34013 Trieste, ITALY; e-mail <a href="mailto:calandra@and.mpi-stuttgart.mpg.de">calandra@and.mpi-stuttgart.mpg.de;</a>
 preprint also available at <a href="http://xxx.lanl.gov/abs/cond-mat/9911478">http://xxx.lanl.gov/abs/cond-mat/9911478.</a>
 71.10.Fd; 71.10.Hf; 75.10.Lp.
<p>
 E. Cappelluti and R. Zeyher, "Impurity Effects on the Flux Phase Quantum
 Critical Point Scenario." To be published in Europhys. Lett.
 Dipartimento di Fisica, Universita di Roma I "La Sapienza," Piazzale A.
 Moro 2, I-00185 Rome, ITALY; telephone +39 06 4991 3450; telefax +39 06
 446 3158; e-mail <a href="mailto:emmcapp@pil.phys.uniroma1.it">emmcapp@pil.phys.uniroma1.it;</a> preprint also available
 at <a href="http://xxx.lanl.gov/abs/cond-mat/9912133">http://xxx.lanl.gov/abs/cond-mat/9912133.</a> 74.10.+v; 74.25.Dw;
 74.20.Mn.
<p>
 M. L. Carvalho, V. J. Styve, J. K. Meen, and D. Elthon, "Phase
 Equilibria of the Bismuth Oxide-Calcium Oxide-Copper Oxide System at 1
 atm of Pure Oxygen." Preprint #99:087; submitted to Physica C. 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> Key words: phase relations, Bi
 superconductors, Bi-Ca-Cu oxides. 74.25.Dw; 81.10.Fq.
<p>
 Y. S. Cha, "Magnetic Diffusion in High-Tc Superconductors." To be
 published in Physica C (in press). Energy Technology Division - 335,
 Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439;
 telephone (630) 252-5899; telefax (630) 252-5568; e-mail <a href="mailto:yscha@anl.gov">yscha@anl.gov.</a>
 Key words: magnetic diffusion, pulsed-current experiments, high-Tc
 superconductors, critical state model.
<p>
 H. S. Chauhan and M. Murakami, "Hot Seeding for the Growth of c-Axis
 Oriented Nd-Ba-Cu-O." Presented at the 2nd Int. Workshop on the Proc.
 and Appl. of Supercond. (RE)BCO Large Grain Materials (PASREG 2),
 Morioka, Japan, Oct. 19-22, 1999; to be published in Supercond. Sci. &
 Technol. Superconductivity Research Laboratory, International
 Superconductivity Technology Center (ISTEC), Morioka Laboratory, 3-35-2
 Iioka-Shinden, Morioka, Iwate 020-0852, JAPAN; e-mail
 <a href="mailto:chauhan@istec.or.jp">chauhan@istec.or.jp.</a>
<p>
 H. S. Chauhan and M. Murakami, "Jc-B Properties of NdBa2Cu3Oy System
 Processed by a Novel Melt Growth Method." To be published in Advances
 in Supercond. XII: Proc. of the 12th Int. Symp. on Superconductivity
 (ISS'99), Morioka, Japan, Oct. 17-19, 1999. Superconductivity Research
 Laboratory, International Superconductivity Technology Center (ISTEC),
 Morioka Laboratory, 3-35-2 Iioka-Shinden, Morioka, Iwate 020-0852,
 JAPAN; e-mail <a href="mailto:chauhan@istec.or.jp">chauhan@istec.or.jp.</a> Key words: Nd3.6Ba2.4Cu1.8Oz, OCMG,
 critical current density (Jc), field-induced pinning centers.
<p>
 H. S. Chauhan and M. Murakami, "Jc-B Properties of (Nd-Y)123 System Melt
 Textured in Air." To be published in Advances in Supercond. XII: Proc.
 of the 12th Int. Symp. on Superconductivity (ISS'99), Morioka, Japan,
 Oct. 17-19, 1999. Superconductivity Research Laboratory, International
 Superconductivity Technology Center (ISTEC), Morioka Laboratory, 3-35-2
 Iioka-Shinden, Morioka, Iwate 020-0852, JAPAN; e-mail
 <a href="mailto:chauhan@istec.or.jp">chauhan@istec.or.jp.</a> Key words: (Nd-Y)123, peak effect, critical
 current density (Jc), field-induced pinning centers.
<p>
 H. S. Chauhan and M. Murakami, "A Novel Melt Processing for Gd-Ba-Cu-O
 System." Presented at the 2nd Int. Workshop on the Proc. and Appl. of
 Supercond. (RE)BCO Large Grain Materials (PASREG 2), Morioka, Japan,
 Oct. 19-22, 1999; to be published in Supercond. Sci. & Technol.
 Superconductivity Research Laboratory, International Superconductivity
 Technology Center (ISTEC), Morioka Laboratory, 3-35-2 Iioka-Shinden,
 Morioka, Iwate 020-0852, JAPAN; e-mail <a href="mailto:chauhan@istec.or.jp">chauhan@istec.or.jp.</a> Key words:
 Gd-Ba-Cu-O system, melt growth, growth temperature, flux pinning.
<p>
 Pavel Diko, "Growth-Related Microstructure of Melt-Grown REBa2Cu3Oy Bulk
 Superconductors." Presented at Superconducting Materials Aspects:
 Research & Technology (SMART 99), Hyeres, France, Sept. 19-23, 1999; to
 be published in Supercond. Sci. & Technol. Institute of Experimental
 Physics, Slovak Academy of Sciences, Watsonova 47, 04353 Kosice,
 SLOVAKIA; telephone +421 95 633 6320; telefax +421 95 633 6292; e-mail
 <a href="mailto:dikos@saske.sk">dikos@saske.sk.</a> Key words: superconductivity, REBa2Cu3Oy, melt-growth,
 microstructure. 74.80.Bj.
<p>
 M.J.W. Dodgson, A. E. Koshelev, V. B. Geshkenbein, and G. Blatter,
 "Evaporation of the Pancake-Vortex Lattice in Weakly-Coupled Layered
 Superconductors." Theory of Condensed Matter Group, Cavendish
 Laboratory, Cambridge CB3 0HE, UNITED KINGDOM; e-mail
 <a href="mailto:mjwd1@phy.cam.ac.uk">mjwd1@phy.cam.ac.uk;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9911439">http://xxx.lanl.gov/abs/cond-mat/9911439.</a> 74.60.Ec; 74.60.Ge; 63.70.+h;
 64.70.Dv.
<p>
 M. V. Feigel'man, A. I. Larkin, and M. A. Skvortsov, "Keldysh Action for
 Disordered Superconductors." L. D. Landau Institute for Theoretical
 Physics, Moscow 117940, RUSSIA; M. A. Skvortsov's e-mail
 <a href="mailto:skvor@itp.ac.ru">skvor@itp.ac.ru;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9907358">http://xxx.lanl.gov/abs/cond-mat/9907358.</a>
<p>
 Alexander M. Gabovich and Alexander I. Voitenko, "Order Parameter
 Symmetry and Low-Temperature Asymptotics for Mesoscopically
 Nonhomogeneous Superconductors." Department of Crystal Physics,
 Institute of Physics, National Academy of Sciences, Prospekt Nauki 46,
 252650 Kiev-22, UKRAINE; telefax +380 44 265 1589; e-mail
 <a href="mailto:collphen@marion.iop.kiev.ua">collphen@marion.iop.kiev.ua.</a>
<p>
 Robert A. Hawsey, Donald M. Kroeger, and David K. Christen, "Development
 of Biaxially Textured YBa2Cu3O7 Coated Conductors in the U.S." To be
 published in Advances in Supercond. XII: Proc. of the 12th Int. Symp.
 on Superconductivity (ISS'99), Morioka, Japan, Oct. 17-19, 1999. Oak
 Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6195; e-
 mail <a href="mailto:hawseyra@ornl.gov">hawseyra@ornl.gov.</a> Key words: high-temperature superconductors,
 YBCO, coated conductors, ion-beam-assisted deposition, RABiTS, biaxial
 texture, electron beam evaporation, sol gel, pulsed laser deposition.
<p>
 R. W. Henn, H. Friedrich, V.P.S. Awana, and E. Gmelin, "Effect of Argon
 and Oxygen Annealing on the Ferromagnetic Ordering of the Ru Moments in
 RuSr2GdCu2O8." To be presented at the 6th Int. Conf. on Mater. and
 Mech. of Supercond. and High Temp. Supercond. (M2S-HTSC-VI), Houston,
 Tex., Feb. 20-25, 2000; to be published in Physica C. Contact V.P.S.
 Awana, Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse
 1, D-70569 Stuttgart, GERMANY; telephone +49 711 689 1364; telefax +49
 711 689 1010; e-mail <a href="mailto:awana@tilux.mpi-stuttgart.mpg.de">awana@tilux.mpi-stuttgart.mpg.de.</a>
<p>
 J. Hofer, T. Schneider, J. M. Singer, M. Willemin, H. Keller, T.
 Sasagawa, K. Kishio, K. Conder, and J. Karpinski, "Torque Magnetometry
 on Single-Crystal High Temperature Superconductors Near the Critical
 Temperature: A Scaling Approach." Submitted to Phys. Rev. B. Physik-
 Institut der Universitaet Zurich, Winterthurerstrasse 190, CH-8057
 Zurich, SWITZERLAND; telephone +41 1 635 5774; telefax +41 1 635 5704;
 e-mail <a href="mailto:jhofer@physik.unizh.ch">jhofer@physik.unizh.ch;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9912052">http://xxx.lanl.gov/abs/cond-mat/9912052.</a> 74.25.Ha; 74.25.Bt; 05.70.Jk.
<p>
 E. Il'ichev, V. Schultze, R.P.J. IJsselsteijn, R. Stolz, V. Zakosarenko,
 H. E. Hoenig, H.-G. Meyer, and M. Siegel, "Peculiarities of rf SQUID
 Response in Finite Magnetic Field." To be published in Physica C (in
 press). Department of Cryoelectronics, Institute for Physical High
 Technology, P.O. Box 100239, D-07702 Jena, GERMANY; telephone +49 3641
 206 121; telefax +49 3641 206 199; e-mail <a href="mailto:ilichev@ipht-jena.de">ilichev@ipht-jena.de.</a> Key
 words: SQUID, Josephson junction. 74.50.+r; 85.25.Cp.
<p>
 M. F. Imayev, D. B. Kazakova, A. N. Gavro, and A. P. Trukhan, "Grain
 Growth in YBa2Cu3O7-x Superconductive Ceramics." To be published in
 Physica C (in press). Institute for Metals Superplasticity Problems,
 Russian Academy of Sciences, Khalturina 39, Ufa 450001, RUSSIA; telefax
 +7 3472 253 759; e-mail <a href="mailto:marcel@ipsm.rb.ru">marcel@ipsm.rb.ru.</a> Key words: grain growth,
 Y123 ceramics. 74.72.Bk; 74.80.Bj; 81.40.-z; 81.40.Ef.
<p>
 Hikaru Kawamura, "Dynamical Properties of Chiral-Glass Order in Ceramic
 High-Tc Superconductors." To be published in J. Phys. Soc. Jpn.: Proc.
 of the Frontiers in Magnetism Workshop, Kyoto, Japan, Oct. 4-7, 1999.
 Department of Earth and Space Science, Faculty of Science, Osaka
 University, Toyonaka 560-0043, JAPAN; e-mail
 <a href="mailto:kawamura@spin.ess.sci.osaka-u.ac.ip">kawamura@spin.ess.sci.osaka-u.ac.ip;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9912022">http://xxx.lanl.gov/abs/cond-mat/9912022.</a> Key words: high-Tc
 superconductors, chiral glass, chirality, vortex glass, frustration,
 critical dynamics, dynamical scaling.
<p>
 B. Lakew, J. C. Brasunas, A. Pique, R. Fettig, B. Mott, S. Babu, and G.
 M. Cushman, "High-Tc Superconducting Bolometer on Chemically-Etched 7-
 micrometer Thick Sapphire." To be published in Physica C (in press).
 NASA/Goddard Space Flight Center, Code 693, Room 142, Bldg. 2,
 Greenbelt, MD 20771; telephone (301) 286-8442; telefax (301) 286-0212;
 e-mail <a href="mailto:brook.lakew@gsfc.nasa.gov">brook.lakew@gsfc.nasa.gov.</a> Key words: IR detectors,
 applications of high-Tc superconductors, etched sapphire. 74.76.Bz;
 85.30.De; 87.66.Pm.
<p>
 M. Lelovic, U. Balachandran, V. Selvamanickam, and P. Haldar,
 "Mechanical and Transport Current Properties of Laminated Ag-Sheathed
 Bi-2223 Tapes." Submitted to Supercond. Sci. & Technol. 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>
<p>
 D. Manske, T. Dahm, and K. H. Bennemann, "Theoretical Analysis of
 Cooper-Pair Phase Fluctuations in Underdoped Cuprates: A Spin-
 Fluctuation Exchange Study." Institut fuer Theoretische Physik, Freie
 Universitaet Berlin, Arnimallee 14, D-14195 Berlin, GERMANY; telephone
 +49 30 838 3042; telefax +49 30 838 6799; e-mail <a href="mailto:dmanske@physik.fu-">dmanske@physik.fu-</a>
 berlin.de; preprint also available at <a href="http://xxx.lanl.gov/abs/cond-">http://xxx.lanl.gov/abs/cond-</a>
 mat/9912062. 74.25.Dw; 74.20.Mn; 74.25.Gz; 74.72.-h.
<p>
 J. Martinez-Fernandez, A. Dominguez-Rodriguez, J. L. Routbort, and K. C.
 Goretta, "Creep of Polycrystalline (Bi,Pb)2Sr2Ca2Cu3Ox." Submitted to
 Scripta Materialia. Departamento Materia Condensada, Universidad de
 Sevilla, E-41080 Sevilla, SPAIN. Key words: creep, constitutive
 equations, superconductor, microstructure.
<p>
 J. K. Meen, J. Geny, and D. Elthon, "Melting Relations of Bi-2212 as a
 Function of Oxygen Fugacity at 1 atm Total Pressure." Preprint #99:086;
 submitted to Physica C. 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> Key words: phase
 relations, Bi superconductors, melting reactions. 74.72.Hs; 74.25.Dw;
 81.10.Fq.
<p>
 J. Mesot, A. Kaminski, H. M. Fretwell, M. Randeria, J. C. Campuzano, H.
 Ding, M. R. Norman, T. Takeuchi, T. Sato, T. Yokoya, T. Takahashi, I.
 Chong, T. Terashima, M. Takano, T. Mochiku, and K. Kadowaki, "On the
 Determination of the Fermi Surface in High-Tc Superconductors by Angle-
 Resolved Photoemission Spectroscopy." Laboratory for Neutron
 Scattering, ETH Zurich and Paul Scherrer Institute, Building WHGA 150,
 CH-5232 Villigen PSI, SWITZERLAND; telephone +41 56 310 4029; telefax
 +41 56 310 2939; e-mail <a href="mailto:joel.mesot@psi.ch">joel.mesot@psi.ch;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9910430">http://xxx.lanl.gov/abs/cond-mat/9910430.</a> 74.25.Jb; 74.72.Hs; 79.60.Bm.
<p>
 N. Morozov, L. Krusin-Elbaum, T. Shibauchi, L. N. Bulaevskii, M. P.
 Maley, Yu. I. Latyshev, and T. Yamashita, "High-Field Quasiparticle
 Tunneling in Bi2Sr2CaCu2O8+d: Negative Magnetoresistance in the
 Superconducting State." MS-K763, MST-STC, Los Alamos National
 Laboratory, K763, Los Alamos, NM 87545; e-mail <a href="mailto:morozov@lanl.gov">morozov@lanl.gov;</a>
 preprint also available at <a href="http://xxx.lanl.gov/abs/cond-mat/9912194">http://xxx.lanl.gov/abs/cond-mat/9912194.</a>
 74.25.Fy; 74.72.Hs; 74.60.Ge.
<p>
 V. V. Moshchalkov and V. A. Ivanov, "Superconductivity with Angular
 Dependent Coupling: Stripes, Coulomb Repulsion and Enhanced Tc."
 Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke
 Universiteit Leuven, Celestijnenlaan 200 D, B-3001 Leuven, BELGIUM;
 telephone +32 16 32 7618; telefax +32 16 32 7983; e-mail
 <a href="mailto:victor.moshchalkov@fys.kuleuven.ac.be">victor.moshchalkov@fys.kuleuven.ac.be;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9912091">http://xxx.lanl.gov/abs/cond-mat/9912091.</a> 74.25.-q; 75.10.Jm; 74.20.Mn.
<p>
 A. Mourachkine, "Interpretation of Inelastic Neutron Scattering Data
 Using the Phase Diagram of Hole-Doped Cuprates." Service de Physique
 des Solides, Universite Libre de Bruxelles, CP233, Boulevard du
 Triomphe, B-1050 Brussels, BELGIUM; telephone +32 2 650 5751; telefax
 +32 2 650 5916; e-mail <a href="mailto:anmourac@ulb.ac.be">anmourac@ulb.ac.be;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9911418">http://xxx.lanl.gov/abs/cond-mat/9911418.</a> Key words: high-Tc
 superconductors, order parameter, pairing, phase coherence. 74.25.Dw;
 74.25.Ha; 74.72.-h.
<p>
 J. B. Moussy, J. Y. Laval, X. Z. Xu, F. C. Beuran, C. Deville Cavellin,
 and M. Lagues, "Percolation Behavior in Intergrowth BiSrCaCuO Structures
 Grown by Molecular Beam Epitaxy." To be published in Physica C (in
 press). Laboratoire Spectroscopie en Lumiere Polarisee CNRS-UPR5, Ecole
 Superieure de Physique et Chimie Industrielles de la ville de Paris, 10
 rue Vauquelin, F-75231 Paris Cedex 05, FRANCE. Key words: molecular
 beam epitaxy, thin films, superconductor, BiSrCaCuO compound.
<p>
 S. M. Mukhopadhyay, N. Mahadev, and S. Sengupta, "Microstructural and
 Spectroscopic Analyses of a Strongly Linked Joint Formed in a
 Superconductor." To be published in Physica C (in press). Department
 of Mechanical and Materials Engineering, Wright State University, 3640
 Colonel Green Highway, Dayton, OH 45432; telephone (937) 775-5040;
 telefax (937) 775-5009; e-mail <a href="mailto:me_dept@cs.wright.edu">me_dept@cs.wright.edu.</a> Key words:
 superconductor, YBCO-123, XPS.
<p>
 Yukihiro Okuno, "Current Patterns and Magnetic Impurities in Time-
 Reversal Breaking Superconductors." Yukawa Institute for Theoretical
 Physics, Kyoto University, Kyoto 606-8502, JAPAN; e-mail
 <a href="mailto:okuno@yukawa.kyoto-u.ac.jp">okuno@yukawa.kyoto-u.ac.jp;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9911366">http://xxx.lanl.gov/abs/cond-mat/9911366.</a> Key words: time-reversal
 breaking state, p_x + ip_y and d + is superconductor, B-dG equation,
 spontaneous current, bound state, magnetic impurity.
<p>
 Ruslan Prozorov, Russell W. Giannetta, Patrick Fournier, and Richard L.
 Greene, "Magnetic Penetration Depth in Electron-Doped Cuprates:
 Evidence for Gap Nodes." To be presented at the 6th Int. Conf. on
 Mater. and Mech. of Supercond. and High Temp. Supercond. (M2S-HTSC-VI),
 Houston, Tex., Feb. 20-25, 2000. Loomis Laboratory of Physics,
 University of Illinois at Urbana-Champaign, 1110 W. Green Street,
 Urbana, IL 61801; e-mail <a href="mailto:prozorov@uiuc.edu">prozorov@uiuc.edu;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9912001">http://xxx.lanl.gov/abs/cond-mat/9912001.</a>
<p>
 Mark A. Rodriguez, Alexandra Navrotsky, and Francesca Licci,
 "Thermochemistry of YBa2Cu3-xMxOy (M = Ni,Zn)." To be published in
 Physica C (in press). Sandia National Laboratories, P.O. Box 5800, MS
 1405, Albuquerque, NM 87185; telephone (505) 844-3583; telefax (505)
 844-2974; e-mail <a href="mailto:marodi@sandia.gov">marodi@sandia.gov.</a> Key words: thermochemistry,
 YBa2Cu3O7-d, nickel, zinc, doping.
<p>
 David Sedmidubsky, Jindrich Leitner, Karel Knizek, Ales Strejc, and
 Miroslav Veverka, "Phase Equilibria in Hg-Ba-Cu-O System." To be
 published in Physica C (in press). Department of Inorganic Chemistry,
 Institute of Chemical Technology, Technicka 5, 166 28 Prague 6, CZECH
 REPUBLIC; telephone +420 2 2435 4082; telefax +420 2 3112 206; e-mail
 <a href="mailto:sedmidub@vscht.cz">sedmidub@vscht.cz.</a> Key words: Hg1201 superconductor, phase equilibria,
 Hg and O2 partial pressure. 74.72.Gr; 74.25.Bt.
<p>
 R. P. Sharma, S. B. Ogale, Z. H. Zhang, J. R. Liu, W. K. Chu, B. Veal,
 A. Paulikas, H. Zheng, and T. Venkatesan, "Phase Transitions in the
 Incoherent Lattice Fluctuations in Optimally and Underdoped YBCO."
 Preprint #99:079; submitted to Nature. 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>
 A. Sin, P. Odier, M. Nunez-Regueiro, "Sol-Gel Processing of Precursor
 for High-Tc Superconductors: Influence of Rhenium on the Synthesis of
 Ba2Ca2Cu3Ox." To be published in Physica C (in press). Laboratoire de
 Cristallographie, Centre National de la Recherche Scientifique (CNRS),
 25 Avenue des Martyrs, BP 166, F-38042 Grenoble Cedex 9, FRANCE;
 telephone +33 4 76 88 7803; telefax +33 4 76 88 1038; e-mail
 <a href="mailto:xicola@labs.polycnrs-gre.fr">xicola@labs.polycnrs-gre.fr.</a> Key words: Hg-based superconductors,
 HgBa2Ca2Cu3O8, sol gel. 74.72.Gr.
<p>
 U. Staub, L. Soderholm, S. R. Wasserman, A.G.O. Conner, M. J. Kramer, B.
 Patterson, M. Shi, and M. Knapp, "Valence Determination as a Function of
 Doping in PrBa2Cu3O7." To be published in Phys. Rev. B. Swiss Light
 Source, Paul Scherrer Institute, CH-5232 Villigen PSI, SWITZERLAND.
<p>
 M. D. Sumption, E. Lee, S. X. Dou, and E. W. Collings, "Extraction of
 Matrix Resistivity from Short Samples of Superconducting
 Multifilamentary Composite Tapes: Influence of Strand Twist and
 Internal Structure." Submitted to Physica C. LASM, Department of
 Materials Science and Engineering, Ohio State University, Columbus, OH
 43210. Key words: ac loss, magnetization, eddy current.
<p>
 Yang Sun, Mike Guidry, Lian-Ao Wu, and Cheng-Li Wu, "SU(4) Dynamical
 Symmetry and the Origin of Pseudogaps." Department of Physics and
 Astronomy, University of Tennessee, Knoxville, TN 37996.
<p>
 David Vaknin, Jerel L. Zarestky, and Lance L. Miller, "On the
 Possibility of Antiferromagnetic Vortex Cores in Superconducting
 YBa2Cu3O7-d." To be published in Physica C (in press). Ames
 Laboratory-USDOE and Department of Physics and Astronomy, Iowa State
 University, Ames, IA 50011-3020; telephone (515) 294-6023; telefax (515)
 294-0689; e-mail <a href="mailto:vaknin@ameslab.gov">vaknin@ameslab.gov.</a> Key words: superconductivity,
 antiferromagnetism, vortex core, YBa2Cu3O7. 74.72.-h; 74.25.Ha.
<p>
 D. T. Verebelyi, D. K. Christen, R. Feenstra, C. Cantoni, A. Goyal, D.
 F. Lee, M. Paranthaman, C. Prouteau, P. N. Arendt, R. F. DePaula and J.
 R. Groves, "Low Angle Grain Boundary Transport in YBa2Cu3O7-d Coated
 Conductors." Submitted to Appl. Phys. Lett. Solid State Physics
 Division, MS 6061, Oak Ridge National Laboratory, P.O. Box 2008, Oak
 Ridge, TN 37831-6061; telephone (865) 574-6264; telefax (865) 574-6263;
 e-mail <a href="mailto:vod@ornl.gov">vod@ornl.gov.</a>
<p>
 A. Wallraff, Yu. Koval, M. Levitchev, M. V. Fistul, and A. V. Ustinov,
 "Annular Long Josephson Junctions in a Magnetic Field: Engineering and
 Probing the Fluxon Interaction Potential." Physikalisches Institut III,
 Universitaet Erlangen-Nuernberg, Erwin-Rommel-Str. 1, D-91058 Erlangen,
 GERMANY; telephone +49 9131 85 27120; telefax +49 9131 15249; e-mail
 <a href="mailto:andreas.wallraff@physik.uni-erlangen.de">andreas.wallraff@physik.uni-erlangen.de;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9911437">http://xxx.lanl.gov/abs/cond-mat/9911437.</a> 74.50.+r; 05.45.Yv; 85.25.Cp;
 03.67.Lx.
<p>
 A. Wallraff, A. V. Ustinov, V. V. Kurin, I. A. Shereshevsky, and N. K.
 Vdovicheva, "Whispering Vortices." Physikalisches Institut III,
 Universitaet Erlangen-Nuernberg, Erwin-Rommel-Str. 1, D-91058 Erlangen,
 GERMANY; telephone +49 9131 85 27120; telefax +49 9131 15249; e-mail
 <a href="mailto:andreas.wallraff@physik.uni-erlangen.de">andreas.wallraff@physik.uni-erlangen.de;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9911260">http://xxx.lanl.gov/abs/cond-mat/9911260.</a> 74.50.+r; 05.45.Yv; 85.25.Cp;
 42.60.Da.
<p>
 Z. Y. Weng, D. N. Sheng, and C. S. Ting, "Nature of Spin-Charge
 Separation." Department of Physics and Texas Center for
 Superconductivity, University of Houston, Houston, TX 77204-5506;
 telephone (713) 743-8200; telefax (713) 743-8201; e-mail
 <a href="mailto:weng@mira.tcs.uh.edu">weng@mira.tcs.uh.edu;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9911146">http://xxx.lanl.gov/abs/cond-mat/9911146.</a> 74.20.Mn; 75.10.Jm; 74.72.-h;
 71.27.+a.
<p>
 N. D. Whelan and J. P. Carbotte, "Magnetic Field as a Probe of Gap
 Energy Scales in YBCO." Department of Physics and Astronomy, McMaster
 University, Hamilton, Ontario, CANADA L8S 4M1; e-mail
 <a href="mailto:whelan@physics.mcmaster.ca">whelan@physics.mcmaster.ca;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9911148">http://xxx.lanl.gov/abs/cond-mat/9911148.</a>
<p>
 Katsuya Yamagiwa and Izumi Hirabayashi, "Orientation Behavior of
 REBa2Cu3O7-y (RE=Rare Earth and Y) Films Prepared by Chemical Solution
 Deposition." Superconductivity Research Laboratory, International
 Superconductivity Technology Center (ISTEC), Div. V, 2-4-1 Mutsuno,
 Atsuta-ku, Nagoya 456-8587, JAPAN. Key words: RE123 film, chemical
 solution deposition, solid-phase epitaxy, orientation behavior, in-plane
 alignment.
<p>
 Chau-Yun Yang, A. Pashitski, A. Polyanskii, D. C. Larbalestier, S. E.
 Babcock, A. Goyal, F. A. List, C. Park, M. Paranthaman, D. P. Norton, D.
 F. Lee, and D. M. Kroeger, "Microstructural Homogeneity and
 Electromagnetic Connectivity of YBa2Cu3O7-d Grown on Rolling-Assisted
 Biaxially Textured Coated Conductor Substrates." To be published in
 Physica C (in press). Contact S. E. Babcock, Applied Superconductivity
 Center and Department of Materials Science and Engineering, University
 of Wisconsin-Madison, 1500 Engineering Drive, Madison, WI 53706;
 telephone (608) 263-5696; telefax (608) 263-1087; e-mail
 <a href="mailto:babcock@engr.wisc.edu">babcock@engr.wisc.edu.</a> Key words: YBCO, coated conductors, RABiTS,
 magneto-optic imaging.
<p>
 K. Yoshida, H. Sasakura, S. Tsukui, R. Oshima, and Y. Mizokawa,
 "Superconductivity in Bi-2212 Thin Films of Bi2Ln0.3Ca2.7Cu2Oz (Ln=Pr,
 Nd, Sm, Eu and Gd) Prepared by Laser Ablation Method." To be published
 in Physica C (in press). Department of Physics, Hamamatsu University
 School of Medicine, Handa-cho, Hamamatsu, Shizuoka 431-3192, JAPAN;
 telephone +81 53 435 2345; telefax +81 53 435 2315; e-mail
 <a href="mailto:kyoshida@hama-med.ac.jp">kyoshida@hama-med.ac.jp.</a> Key words: superconductivity, Bi-2212,
 metastable, Bi2Ln0.3Ca2.7Cu2Oz, thin film, laser ablation. 74.76.-w;
 74.72.-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>
 *Feb. 10 - 11, 2000: The 2000 Wire Development Workshop of the DOE
 Superconductivity Program, Hilton St. Petersburg, St. Petersburg, Fla.
 Recent progress in first- and second-generation wire technology will be
 presented by national laboratories, wire manufacturers, and other
 program partners. Workshop brings together the leading U.S. scientists
 and engineers involved in the research and development of high-
 temperature superconducting (HTS) wire. Will focus on the development
 of commercially useful coated conductors. Most current agenda available
 at Web site. Contact Audrey Lamanna, Energetics, telephone (202) 479-
 2748, e-mail <a href="mailto:alamanna@energeticsinc.com">alamanna@energeticsinc.com;</a> Web site
 <a href="http://www.eren.doe.gov/superconductivity/calendar.html">http://www.eren.doe.gov/superconductivity/calendar.html.</a>
<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 aware-ness 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. 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); 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. 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>
<p>
 June 19 - 22, 2000: International Workshop on Superconductivity,
 Kunibiki Messe, Matsue, Shimane Prefecture, Japan. Workshop will focus
 on fundamental properties of high-temperature superconducting materials
 for actual applications. Theme of the workshop is "Structure and
 Property Relationships for Applications of High-Temperature
 Superconducting Materials." No parallel sessions; significant amount of
 time to be allotted for the discussion of each paper. Topics of
 interest (including, but not restricted to): interfaces, grain
 boundaries, surfaces, thin films, bulks, wires and tapes, etc. Invited
 presentations, contributed papers, and contributed posters. One-page
 summary deadline, January 15, 2000. Contact Tetsuji Kobayashi,
 Director, International Affairs Department, ISTEC Eishin Kaihatsu Bldg.,
 6F, 34-3 Shimbashi 5-chome, Minato-ku, Tokyo 105-0004, Japan; telephone
 +81 3 3431 4002; telefax +81 3 3431 4044; e-mail t-
 <a href="mailto:kobayashi@istec.or.jp">kobayashi@istec.or.jp;</a> Web page
 <a href="http://www.istec.or.jp/ISTEC_homepage/WORK/e-workshop.html">http://www.istec.or.jp/ISTEC_homepage/WORK/e-workshop.html.</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>
 *Sept. 17 - 22, 2000: The Applied Superconductivity Conference (ASC
 2000), Pavilion Convention Center, Virginia Beach, Virginia. Premier
 conference on applied superconductivity held every two years. The
 meeting will highlight the latest developments and will feature invited
 presentations that offer an exciting look into the future. Papers
 solicited in three general areas of superconductivity: large scale,
 materials, and electronics. Abstract deadline, February 11, 2000. All
 abstracts must be submitted electronically. Further information
 available at the Web site <a href="http://www.ascinc.org">http://www.ascinc.org.</a>
 <hr>
<p>
 FYI
 (High-Tc Update takes no responsibility for want ads listed in this
 section.)
<p>
 Position Open: Applications are invited for a postdoctoral position at
 the Chalmers University of Technology for development of highly textured
 HTS films on flexible substrates. Research will address induced
 epitaxial film growth both for multilayer superconducting electronics
 (e.g., pick-up loops and transformers based on YBCO on flexible
 substrates for SQUID applications), and the need for producing high-
 current-density, high-critical-field cable for future power
 applications. Prefer candidates with recent (less than about 2 years)
 Ph.D. degree in physics, and a strong background in thin film deposition
 and characterization of high-temperature superconductors. A newly built
 deposition system will be used for the project. For further
 information, please contact Dr. Dag Winkler or Prof. Tord Claeson,
 IMEGO, Institute of Microelectronics in Gothenburg, Byggnad 11,
 Aschebergsgatan 46, SE-411 33 Goteborg, SWEDEN; telephone +46 31 750-
 1808 or -1800; telefax +46 31 750-1801; e-mail <a href="mailto:dag.winkler@imego.com">dag.winkler@imego.com.</a>
<p>
 Position Open: A two-year postdoctoral position is available in the
 research group on solid-state chemistry and ceramic superconductors.
 Topic: mechanochemistry and reactive spray drying. Scientific
 responsibilities will encompass application of spray drying to reactive
 inorganic systems in aqueous and non-aqueous media and the evaluation of
 its repercussions on physical and chemical aspects of the granular
 materials obtained. In addition, the applicant is expected to organize
 meetings with industrial and academic partners in order to develop a
 task force for the introduction and follow up of a four-year European
 research program. Salary: 1375 ECU/month. Applicants are requested to
 send their CV by Jan. 15, 2000, to Prof. dr. Serge Hoste, Department of
 Inorganic and Physical Chemistry, University of Ghent, Krijgslaan 281,
 9000 Ghent, Belgium; telephone +32 9 264 44 41; telefax +32 9 264 49 83;
 e-mail <a href="mailto:serge.hoste@rug.ac.be">serge.hoste@rug.ac.be.</a>
 <hr>
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<p>
 High-Tc Update is the high-Tc superconductivity information exchange
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<p>
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 High-Tc Update, Vol. 14, #1, January 1, 2000.
 <hr>