HIGH-Tc UPDATE E-MAIL VERSION, VOL. 14, NO. 7, April 1, 2000.
<p>
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<p>
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<p>
 NOTA BENE: Because John Clem, our Science Editor, is on travel,
 Douglas K. Finnemore, Distinguished Professor of Physics, Iowa State
 University, has graciously agreed to write "Nota Bene" for this issue.
<p>
 A Reminder: This, readers, is the second-to-last issue of High-Tc
 Update. Our final issue will be the April 15, 2000, newsletter. We
 will continue to maintain our Web site for a few months beyond this
 date, and will list information on all preprints received after the
 deadline at our Web site. We will also continue to post new information
 on upcoming conferences and resources. Please contact the Editor if you
 have questions.
<p>
 <hr>
<p>
 Bi-2212
<p>
 Scanning tunneling microscopy on Bi-2212 surfaces has been used by B. W.
 Hoogenboom (Geneva) et al. to study both the shape of the vortex core
 and the motion of the core as it moves small distances. A very
 irregular distribution of the positions and shapes of the vortex cores
 imply strong pinning by defects and inhomogeneities. Some vortex cores
 seem to consist of two or more randomly distributed elements. Even more
 striking is the observation of vortex motion where the vortex cores are
 divided between two positions before totally moving from one position to
 the other. These effects can be explained by quantum tunneling of
 vortices between different pinning centers during the averaging time of
 the scanning tunneling microscopy measurement. This analysis would
 represent the first microscopic signature of the vortex quantum
 tunneling as derived from magnetic relaxation measurements, and it is
 also a further indication that objects of larger size and complexity
 than one or several atoms can appear as a superposition of different
 quantum states.
<p>
 Inelastic neutron scattering studies by H. He (Stuttgart) et al. have
 revealed a resonant spin excitation in the superconducting state of Bi-
 2212. For an overdoped sample with Tc = 83 K, the mode energy is 38
 meV, significantly lower than in optimally doped material with Tc = 91 K
 and a mode energy of 43 meV. The ratio of the mode energy to the
 transition temperature is found to be a constant of about 5.4 indicating
 that the mode energy scales with Tc. This observation helps resolve a
 long-standing controversy about the origin of the resonant spin
 excitation in high temperature superconductors. More detailed analysis
 of the experiment clearly favors the particle-hole over the particle-
 particle interpretation of the resonant spin excitation peak.
<p>
 A report by A. D. Gromko (Boulder) et al. describes photoemission
 results at a photon energy of 33 eV that probe the electron-like and
 hole-like properties of the Fermi surface topology of Bi-2212. The goal
 here is to resolve the nature of the charge carriers near the zone
 boundary of the Fermi surface. At this energy, they clearly identify the
 existence of electron-like portions of Fermi surface near the M point.
 The hole-like topology cannot explain the details of the spectra, even
 with the ad-hoc inclusion of strong k-dependent matrix element effects.
 The energy dependence of the final state matrix elements is discussed in
 some detail.
<p>
 The time evolution of the vortex structure in Bi-2212 has been studied
 after a sudden application of a magnetic field by D. Giller (Bar-Ilan)
 et al. using a high temporal resolution magneto-optical system. Images
 reveal dynamic coexistence of two vortex phases: a quasi-ordered phase
 in the sample interior, and a transient disordered phase near the sample
 edges. The border between these two phases is marked by an abrupt
 change in the gradient of the local induction and changes its position
 with time. The rate at which this process evolves changes with the
 location in the field-temperature diagram.
<p>
 An article by C. E. Gough et al. (Birmingham) reports the intrinsic c-
 axis tunneling in the superconducting state using mesa structures on the
 surface of Bi-2212. The temperature dependence of the zero-field
 critical current and quasi-particle conductance is related to
 microscopic d-wave models in the presence of impurity scattering. The
 strong field dependence of the c-axis critical current provides
 information on the correlation of flux pancakes across adjacent
 superconducting layers. An instability in the current-voltage
 characteristics is observed below 20 K which accounts for the apparent
 drop in critical current at low temperatures reported earlier.
<p>
 Flux pinning enhancement by alkaline-earth cuprate defects as well as
 nanophase alumina and Au particles has been studied by T. Haugan (NIST-
 Gaithersburg) et al. for thick Bi-2212 films. The addition of defect
 particles delayed and reduced the formation of c-axis texture during the
 growth of the film. Oxide defects were observed to rapidly coarsen in
 the melt, simultaneously with a beneficial increase of 2212 texture.
 The addition of nanophase alumina improved the critical current density
 and the addition of micron size Au completely suppressed the 2212 c-axis
 orientation of the film.
<p>
<p>
 Y-123
<p>
 As reported by F. Tafuri (Napoli) and J. R. Kirtley (IBM-Yorktown),
 evidence is found for broken time-reversal symmetry in Y-123 thin films.
 They observe spontaneous magnetization with random sign in c-axis
 oriented thin films imaged with a scanning SQUID microscope. This
 magnetization arises when the samples become superconducting and appears
 to be associated with non-magnetic defects in the films. The flux is
 concentrated in "fractional" vortices that apparently contain less than
 the superconducting quantum, a sign of broken time-reversal symmetry.
 In contrast with the granular high Tc samples, which also show
 spontaneous magnetization with random signs, these samples shield
 diamagnetically. These experiments raise the possibility of
 intentionally introducing time-reversal symmetry breaking effects by,
 for example, photolithographically patterning small defects in high-Tc
 samples. This could be applicable to the fabrication of elements of
 quantum computation opening new perspectives in the design of such
 devices without necessarily using Josephson junctions.
<p>
 According to a reprint from R. Liang et al. (U. British Columbia), high
 purity, highly ordered and twin-free ortho-II phase YBa2Cu3O6.5 crystals
 have been successfully prepared and their structural properties
 characterized by x-ray diffraction. Removal of the twin boundaries was
 found to be essential in order to obtain highly ordered ortho-II
 crystals. The ortho-II phase shows a sharp superconducting transition
 at 62 K, 5 K higher than the ortho-I phase of the same oxygen content.
 The ordering was found to be three dimensional with long correlation
 lengths. No doubling of the unit lattice along the c-direction was
 observed, indicating an attractive interaction between oxygen ions in
 adjacent basal planes.
<p>
 Oxygen ordering and the 60 K plateau on the ortho-II phase of Y-123 also
 was reported by F. Yakhou (Grenoble) et al. for oxygen contents between
 6.48 and 6.62. The best sample exhibits correlation lengths up to 70
 unit cells along the a-axis and 5 unit cells along the c-axis. The
 superstructure peaks are resolution limited in the k-direction.
<p>
 Local structural changes in Li-doped Y-123 have been studied by F. Maury
 (Ecole Polytechnique) et al. by neutron powder diffraction. When
 synthesized in oxygen, Li substitutes for Cu in the copper oxide planes.
 When synthesized in air, about 20% of the Li substitutes forCu on the
 copper oxide chains. Best fits to the spectra are obtained assuming that
 each substitution of a Li for a Cu entails the loss of an apical oxygen.
<p>
<p>
 Theory
<p>
 A simple model has been developed by I. Martin and A. V. Balatsky (Los
 Alamos) to describe the scanning tunneling microscope experiments that
 probe impurity sites of a single Ni atom replacing the Cu atom in the
 copper oxide plane. They find that to explain the experimental data,
 they need to include both the non-magnetic scattering of carriers from
 the Ni site as well as spin interaction between the carriers and the
 impurity spin. The most striking feature observed in the experiment --
 the rotation of the "impurity cross" as a function of bias -- appears to
 be a universal function of the theoretical model. This rotation is the
 manifestation of the quantum-mechanical nature of the quasiparticles in
 the superconducting state, and is a consequence of the unique dual
 particle-hole composition of the quasiparticles.
<p>
 The connection between angle-resolved photoemission experiments and the
 theory of high-temperature superconductors is discussed by E. Abrahams
 (Rutgers) and C. M. Varma (Bell Labs). The data are found to be
 consistent with a phenomenological description of the normal state of
 these materials as marginal Fermi liquids. A connection is drawn
 between the experiments and various constraints on microscopic theories.
<p>
 As reported by X. Hu and M. Tachiki (NRIM-Tsukuba), extensive Monte
 Carlo simulations show that there is a critical value of the product of
 the anisotropy parameter and the magnetic field in interlayer Josephson-
 vortex systems in high-Tc superconductors. Below a critical value, the
 thermodynamic phase transition between the normal and superconducting
 state is first order and above this critical value, it is second order.
 According to present results, the phase transition in Josephson-vortex
 systems in Y-123 is first order up to 50 T, while it varies from first
 to second order in Bi-2212 at about a field of 1.7 T.
<p>
 An analysis of optical conductivity data by E. Schachinger (Graz) and J.
 P. Carbotte (McMaster) has provided evidence for coupling of charge
 carriers to the 41 meV spin resonance seen in the superconducting state
 for a number of high-temperature superconductors. Analysis originally
 done for optimally doped Y-123 is extended to Y-124, Tl-2201, and Bi-
 2212. A more specific interpretation of the optical data in terms of a
 spin fluctuation exchange mechanism of superconductivity gives an
 underlying effective spectral density which is strongly temperature
 dependent and which contains important feedback effects that further
 stabilize superconductivity as the temperature is reduced.
<p>
 A manuscript by W. A. Atkinson (Gainesville) et al. reports a numerical
 study of disorder effects in a 2D d-wave BCS superconductor. They
 compare exact diagonalization calculations of the density-of-states with
 the standard perturbative T-matrix approximation. Local suppression of
 the order parameter near impurity sites which occurs in self-consistent
 solutions of the Bogoliubov-deGennes equations, leads to apparent
 asymptotic power law behavior rho(E) ~ |E|^[alpha].
<p>
 Conductivity due to classical phase fluctuations in a model for high-
 temperature superconductors is studied by S. Barabash (Ohio State) et
 al. They show that the integral of the real part of the conductivity
 over all frequencies is not zero below the superconducting transition
 temperature providing that there is some quenched disorder in the
 system. Furthermore, for a fixed amount of quenched disorder, this
 integral at low temperature is proportional to the zero-temperature
 superfluid density in agreement with experiment.
<p>
 The distribution of magnetic induction in the Meissner state with finite
 London penetration depth is analyzed by R. Prozorov (Illinois) et al.
 for platelet samples of rectangular cross-section in a perpendicular
 magnetic field. The exact 2D numerical solution for the London equation
 is extended to the realistic 3D case and compared to real foils and
 single crystals.
<p>
<p>
 Thin Films
<p>
 Raman and x-ray measurements have been used by G. Gibson (Imperial
 College) et al. to study the cation disorder in epitaxial Y-123 thin
 films grown at different temperatures to give different c parameters.
 The Raman intensity ratio (585)/(340) is found to correlate with the x-
 ray intensity ratio (005)/(006) which is known to measure the cation
 disorder. Raman has the advantage of a spatial resolution of about 1
 micrometer and changes in oxygen content do not affect the Raman method.
 Because the x-ray method gives global information and Raman is a near
 surface measurement, the two techniques are complementary.
<p>
 As reported by H.-W. Yu (National Taiwan U.) et al., atomic force
 microscopy has been used to investigate the correlation between the
 characteristics of grooved SrTiO3 bicrystal line and grain boundary
 microstructure for junction preparation in Y-123 films. When the
 underlying groove becomes deeper and steeper, the density-of-growth
 spirals along the boundary line increases and the meandering
 configuration of the grain-boundary disappears. From the measured
 signals of the dc-SQUID patterned on the films, they also conclude that
 the homogeneity of the grain-boundary is improved.
<p>
 Pulsed-laser deposition of Y-123 thin films and step-edge Josephson
 junctions has been studied by T. Schmauder et al. (Jena) in order to
 determine the influence of the angle between the target and the
 substrate orientation on the properties of the junction. By increasing
 the angle of growth, they find a shift of the optimal growth conditions
 toward higher laser pulse energy. Step-edge Josephson junctions
 prepared from Y-123 films which were deposited at different angles show
 a maximum product of critical current and normal resistivity at an angle
 of 20 degrees to 45 degrees.
<p>
 In a preprint by F. M. Granozio (Napoli) et al., the authors show that
 reducing the degree of symmetry of the surface, by choosing a suitable
 miscut angle between the substrate and the crystal plane, Y-123 films
 showing a single or at least a preferential domain can be obtained. The
 driving force that determines the domain selection is discussed.
<p>
 The response of Y-123 bicrystal grain-boundary junctions to small dc
 magnetic fields has been probed by H. Xin (MIT) et al. with a low power
 microwave signal of 4.4 GHz. Peaks in the microwave loss at certain dc
 magnetic fields are observed that result from individual Josephson
 vortices penetrating into the grain-boundary junction under study. The
 system is modeled as a long Josephson junction described by the sine-
 Gordon equation with appropriate boundary conditions, and excellent
 agreement between data and the model is obtained.
<p>
 Ion-beam sputtering has been used by T. Endo et al. (Mie University,
 Japan) to prepare films of Y-123 at the low substrate temperatures of
 450-650^oC with a supply of oxygen molecules or plasma. The growth of
 the a-axis oriented phase was enhanced by the plasma and films could be
 grown with substrate temperatures as low as 450^oC. Non-thermal energy
 from the kinetic energy of the ions and molecules provide the excitation
 energy required to form the a-axis structure at these temperatures.
<p>
 A model has been developed by X. J. Chen (Hong Kong) et al. to describe
 the thickness dependence of the superconducting transition temperature
 of La-214 thin films. Strain and the resulting lattice mismatch plays a
 key role in this model. Calculations show that the values of Tc of
 films on SrLaAlO4 substrates under compressive strain are always higher
 than those on SrTiO3 under tensile strain. As the thickness is reduced,
 the films grown on SrTiO3 substrates exhibit a rapid reduction of Tc
 whereas Tc increases on the SrLaAlO4 substrates. Theoretical results
 are in qualitative agreement with experiment.
<p>
 Anisotropic arrays of antidots have been prepared on Y-123 and Nb thin
 films by electron-beam-lithography by S. Kolesnik (Warsaw) et al. in
 order to study the flux pinning effects. Fast-Fourier-Transform
 analysis of the magnetization curves reveals their periodic character
 which corresponds to the matching effect of the vortex lattice. These
 observations strongly suggest the formation of anisotropic vortex
 lattices in the patterned thin films.
<p>
<p>
 Applications
<p>
 Texture development in pure Ag has been investigated by H. L. Suo
 (Geneva) et al. in order to produce a stable {110}<112> biaxially
 textured ribbon that can be used as a substrate for Y-123 coated tapes
 without a buffer layer. The starting material was 99.95% pure
 commercial Ag foil. A 20% deformation reduction was used at each step
 of the cold-rolling process after which an optimal annealing was
 achieved at 800^oC for 4 hours in a primary vacuum. This leads to large
 grain ribbons with {110}<112> orientation. X-ray pole figures show a
 full width at half maximum of 6 degrees. A twinning mechanism is used
 to explain the texture. The texture is retained on further heating to
 900^oC which is a practical temperature for coated tape preparation.
<p>
 A preprint by D. Liu et al. (Beijing) reports the fabrication of
 biaxially textured {110}<211> Ag tapes suitable for Y-123 coated
 conductors. The annealing temperature of 550^oC is optimal but 700^oC
 also is satisfactory. Using a pulsed-laser deposition method, Y-123
 coatings were deposited on the tape that gave 5 x 10^5 A/cm^2 at 77 K
 and 0 T.
<p>
 Contributed by D. K. Finnemore
 <hr>
<p>
 Contents: Technology News is on page 4; Preprints begin on page 4;
 Coming Events begin on page 10; and Resources are on page 11.
<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>
 Recently, Superconductor Technologies Inc. (STI) announced that it has
 signed a supply agreement with ALLTEL Communications Products under the
 terms of which ALLTEL will designate STI as their supplier of high-
 temperature-superconductor (HTS) base-station-receiver solutions for
 their analog and CDMA cellular and PCS networks. ALLTEL, a pioneer in
 the deployment of superconducting technology in a cellular network,
 completed extensive evaluations of several cryogenic filter systems in
 1999 by reviewing product performance, network impact, cost of
 ownership, reliability, and vendor strength. Measurable improvements in
 coverage, minutes of use, and customer satisfaction have been noted
 deploying the SuperFilter(R) at several sites. For further information,
 contact Superconductor Technologies Inc., 460 Ward Drive, Suite F, Santa
 Barbara, CA 93111-2310; telephone (805) 683-7646; telefax (805) 683-
 8527; Web site at <a href="http://www.suptech.com">http://www.suptech.com.</a>
<p>
<p>
 Contributed by Sreeparna Mitra
 <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>
 Elihu Abrahams and C. M. Varma, "What Angle-Resolved Photoemission
 Experiments Tell About the Microscopic Theory for High-Temperature
 Superconductors." Submitted to Proc. Natl. Acad. Sci. Center for
 Materials Theory, Rutgers University, 136 Frelinghuysen Road,
 Piscataway, NJ 08854-8019; e-mail <a href="mailto:abrahams@physics.rutgers.edu">abrahams@physics.rutgers.edu;</a> preprint
 also available at <a href="http://xxx.lanl.gov/abs/cond-mat/0003135">http://xxx.lanl.gov/abs/cond-mat/0003135.</a>
<p>
 B. Andrzejewski, A. Kaczmarek, J. Stankowski, B. Hilczer, J. Marfaing,
 S. Regnier, and C. Caranoni, "Magnetic Properties of YBCO-PST
 Composites." Submitted to Phys. Status Solidi (a). Institute of
 Molecular Physics, Polish Academy of Sciences (IFM PAN), Smoluchowskiego
 17, PL-60179 Poznan, POLAND; telephone +48 61 861 2300; telefax +48 61
 868 4524; e-mail <a href="mailto:and@ifmpan.poznan.pl">and@ifmpan.poznan.pl.</a> 74.25.Ha; 74.80.Bj; 76.30.Fc.
<p>
 Yuji Aoki, Hiroki R. Sato, Hitoshi Sugawara, and Hideyuki Sato,
 "Anomalous Magnetic Properties of Heusler Superconductor YbPd2Sn." To
 be published in Physica C (in press). Department of Physics, Faculty of
 Science, Tokyo Metropolitan University, Minami-Ohsawa 1-1, Hachioji-shi,
 Tokyo 192-0397, JAPAN; telephone +81 426 772487; telefax +81 426 772483;
 e-mail <a href="mailto:aoki@phys.metro-u.ac.jp">aoki@phys.metro-u.ac.jp.</a> Key words: YbPd2Sn, magnetic
 superconductivity, crystalline field effect, antiferromagnetic short-
 range ordering, specific heat. 74.70.Ad; 71.70.Ch; 74.25.Dw; 75.40.-s.
<p>
 W. A. Atkinson, P. J. Hirschfeld, and A. H. MacDonald, "Inhomogeneous
 Order-Parameter Suppression in Disordered d-Wave Superconductors."
 Department of Physics, University of Florida, P.O. Box 118440,
 Gainesville, FL 32611; e-mail <a href="mailto:atkinson@phys.ufl.edu">atkinson@phys.ufl.edu;</a> preprint also
 available at <a href="http://xxx.lanl.gov/abs/cond-mat/0002333">http://xxx.lanl.gov/abs/cond-mat/0002333.</a> 74.25.Bt;
 74.25.Jb; 74.40.+k.
<p>
 S. Barabash, D. Stroud, and I.-J. Hwang, "Conductivity Due to Classical
 Phase Fluctuations in a Model for High-Tc Superconductors." Submitted
 to Phys. Rev. B. Department of Physics, Ohio State University, 174 West
 18th Ave., Columbus, OH 43210; e-mail <a href="mailto:barabash@mps.ohio-state.edu">barabash@mps.ohio-state.edu;</a>
 preprint also available at <a href="http://xxx.lanl.gov/abs/cond-mat/0002346">http://xxx.lanl.gov/abs/cond-mat/0002346.</a>
 74.25.Nf; 74.40.+k; 74.62.Dh; 74.50.+r.
<p>
 V. N. Bogomolov, "Molecular Crystals and High-Temperature
 Superconductivity." A.F. Ioffe Physico-Technical Institute, Russian
 Academy of Sciences, 26 Polyteknicheskaya, St. Petersburg 194021,
 RUSSIA; preprint also available at <a href="http://xxx.lanl.gov/abs/cond">http://xxx.lanl.gov/abs/cond-</a>
 mat/9912034. 74.10.+v; 71.30.+h; 71.45.Gm; 74.62.-c.
<p>
 X. J. Chen, H. Q. Lin, and C. D. Gong, "Thickness Dependence of the
 Superconducting Transition Temperature of La2-xSrxCuO4 Films." To be
 published in Phys. Rev. B. Contact H. Q. Lin, Department of Physics,
 Chinese University of Hong Kong, Hong Kong, PEOPLE'S REPUBLIC OF CHINA;
 telephone +852 2603 5204; telefax +852 2609 6365; e-mail
 <a href="mailto:hqlin@phy.cuhk.edu.hk">hqlin@phy.cuhk.edu.hk.</a> 74.72.Dn; 74.76.Bz; 74.62.-c.
<p>
 Joshua L. Cohn, "Heat Conduction and Charge Ordering in Perovskite
 Manganites, Nickelates and Cuprates." To be published in the Proc. of
 the Int. Thermal Conductivity Conf., Ann Arbor, Mich., June 13-16, 1999.
 Department of Physics, University of Miami, Coral Gables, FL 33124-0530;
 e-mail <a href="mailto:cohn@phyvax.physics.miami.edu">cohn@phyvax.physics.miami.edu;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/0003047">http://xxx.lanl.gov/abs/cond-mat/0003047.</a>
<p>
 O. F. de Lima and C. A. Cardoso, "Experimental Study on Scaling Laws for
 the Complex Susceptibility of Type-II Superconductors." To be published
 in Phys. Rev. B. Instituto de Fisica "Gleb Wataghin," Universidade
 Estadual de Campinas (UNICAMP), 13083-970 Campinas, SP, BRAZIL. 74.60.-
 w; 74.60.Ge; 74.60.Jg.
<p>
 U. Scotti di Uccio, F. Lombardi, F. Ricci, F. Miletto Granozio, E.
 Manzillo, F. Carillo, and F. Tafuri, "Characterization of
 (001)YBCO/(110)CeO2 Bilayers for Biepitaxial Josephson Junctions."
 Submitted to J. Mater. Res. Dipartimento di Scienze Fisiche, Universita
 di Napoli "Federico II," Piazzale Tecchio 80, I-80125 Napoli, ITALY; e-
 mail <a href="mailto:scotti@na.infn.it">scotti@na.infn.it.</a>
<p>
 Tamio Endo, Ken-ichi Itoh, Munehiro Horie, Katsutoshi Itoh, Naoki
 Hirate, Satoshi Yamada, Masaki Tada, and Shinji Sano, "Low-Temperature
 Process and Growth Enhancement of a-Oriented YBa2Cu3Ox Thin Films by
 Oxygen Plasma." To be published in Physica C (in press). Faculty of
 Engineering, Mie University, 1515 Kamihama, Tsu, Mie 514-8507, JAPAN;
 telephone +81 59 231 9400; telefax +81 59 231 9471; e-mail
 <a href="mailto:endo@cm.elec.mie-u.ac.jp">endo@cm.elec.mie-u.ac.jp.</a> Key words: a-oriented YBCO, orientation
 mechanism, plasma effects, surface energy, low-temperature (450^oC)
 growth.
<p>
 G. Gibson, L. F. Cohen, R. G. Humphreys, and J. L. MacManus-Driscoll, "A
 Raman Measurement of Cation Disorder in YBa2Cu3O7-x Thin Films." To be
 published in Physica C (in press). Contact J. L. MacManus-Driscoll,
 Department of Materials, Imperial College of Science, Prince Consort
 Road, London SW7 2BP, UNITED KINGDOM; telephone +44 171 594 6749;
 telefax +44 171 584 3194; e-mail <a href="mailto:j.driscoll@ic.ac.uk">j.driscoll@ic.ac.uk.</a> Key words: Raman
 scattering, cation disorder, XRD.
<p>
 D. Giller, A. Shaulov, L. Dorosinskii, T. Tamegai, and Y. Yeshurun,
 "Magneto-Optical Imaging of Transient Vortex States in Bi2Sr2CaCu2O8+d
 Crystals." To be published in 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. Institute of Superconductivity,
 Bar-Ilan University, Ramat Gan 52900, ISRAEL; Y. Yeshurun's telephone
 +972 3 531 8607; telefax +972 3 535 3298; e-mail
 <a href="mailto:yeshurun@mail.biu.ac.il">yeshurun@mail.biu.ac.il;</a> preprint also available at
 <a href="http://www.biu.ac.il/ESC/htslab/">http://www.biu.ac.il/ESC/htslab/.</a>
<p>
 D. Giller, A. Shaulov, L. Dorosinskii, T. Tamegai, and Y. Yeshurun,
 "Nucleation and Growth of the Quasi-Ordered Vortex Phase in
 Bi2Sr2CaCu2O8+d." To be published in 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. Institute of
 Superconductivity, Bar-Ilan University, Ramat Gan 52900, ISRAEL; Y.
 Yeshurun's telephone +972 3 531 8607; telefax +972 3 535 3298; e-mail
 <a href="mailto:yeshurun@mail.biu.ac.il">yeshurun@mail.biu.ac.il;</a> preprint also available at
 <a href="http://www.biu.ac.il/ESC/htslab/">http://www.biu.ac.il/ESC/htslab/.</a>
<p>
 D. Giller, A. Shaulov, T. Tamegai, and Y. Yeshurun, "Transient Vortex
 States in Bi2Sr2CaCu2O8+d Crystals." To be published in Phys. Rev.
 Lett. Institute of Superconductivity, Bar-Ilan University, Ramat Gan
 52900, ISRAEL; Y. Yeshurun's telephone +972 3 531 8607; telefax +972 3
 535 3298; e-mail <a href="mailto:yeshurun@mail.biu.ac.il">yeshurun@mail.biu.ac.il;</a> preprint also available at
 <a href="http://www.biu.ac.il/ESC/htslab/">http://www.biu.ac.il/ESC/htslab/.</a>
<p>
 C. E. Gough, P. J. Thomas, J. C. Fenton, and G. Yang, "Quasiparticle
 Tunneling and Field-Dependent Critical Current 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. 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/0002246">http://xxx.lanl.gov/abs/cond-mat/0002246.</a>
<p>
 F. Miletto Granozio, F. Carillo, F. Lombardi, F. Ricci, U. Scotti di
 Uccio, F. Tafuri, and J. C. Villegier, "Domain Selection in the Growth
 of YBCO Films Deposited on Vicinal Substrates." Submitted to Appl.
 Phys. A. INFM-Dipartimento di Scienze Fisiche, Universita di Napoli
 "Federico II," Piazzale Tecchio 80, I-80125 Napoli, ITALY; telephone +39
 081 76 2423; telefax +39 081 23 91 821; e-mail <a href="mailto:miletto@na.infn.it">miletto@na.infn.it.</a>
<p>
 A. D. Gromko, Y.-D. Chuang, D. S. Dessau, K. Nakamura, and Yoichi Ando,
 "Fermi Surface Topology of Bi2Sr2CaCu2O8+d at h[nu] 33 eV: Hole or
 Electron-Like?" Department of Physics, University of Colorado, Boulder,
 CO 80309-0390; e-mail <a href="mailto:adam.gromko@colorado.edu">adam.gromko@colorado.edu;</a> preprint also available
 at <a href="http://xxx.lanl.gov/abs/cond-mat/0003017">http://xxx.lanl.gov/abs/cond-mat/0003017.</a>
<p>
 S. K. Hasanain, S. Shahzada, A. Mumtaz, and R. Semerad, "Asymmetry of
 Sweep Rate and Magnetic Relaxation Effects in YBCO Thin Films." To be
 published in Physica C (in press). Department of Physics, Quaid-i-Azam
 University, Islamabad 45320, PAKISTAN; telephone +92 51 82 9472; telefax
 +92 51 21 0256; e-mail <a href="mailto:khasnain@comsats.net.pk">khasnain@comsats.net.pk.</a>
<p>
 T. Haugan, W. Wong-Ng, L. P. Cook, H. J. Brown, L. Swartzendruber, and
 D. T. Shaw, "Flux Pinning of Bi2Sr2CaCu2O8+d/Ag Superconductors
 Utilizing (Sr,Ca)14Cu24O41 Defects and Nanophase Al2O3 and Au
 Particles." To be published in Physica C. Materials Science and
 Engineering Laboratory, National Institute of Standards and Technology,
 Stop 8520, 100 Bureau Dr., Gaithersburg, MD 20899-8520; telephone (301)
 975-4954; telefax (301) 975-5334; e-mail <a href="mailto:timh@nist.gov">timh@nist.gov.</a> Key words:
 Bi2Sr2CaCu2O8+d, (Sr,Ca)3Al2O6, (SrCa)14Cu24O41, nanophase Al2O3,
 nanophase Au, critical current density, flux pinning. 74.62.Dh;
 74.72.Hs.
<p>
 H. He, Y. Sidis, P. Bourges, G. D. Gu, A. Ivanov, N. Koshizuka, B.
 Liang, C. T. Lin, L. P. Regnault, E. Schoenherr, and B. Keimer,
 "Resonant Spin Excitation in an Overdoped High Temperature
 Superconductor." Max-Planck-Institut fuer Festkoerperforschung,
 Heisenbergstrasse 1, D-70569 Stuttgart, GERMANY; B. Keimer's e-mail
 <a href="mailto:keimer@kmr.mpi-stuttgart.mpg.de">keimer@kmr.mpi-stuttgart.mpg.de;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/0002013">http://xxx.lanl.gov/abs/cond-mat/0002013.</a>
<p>
 Takashi Hirai, Koichi Kusakabe, and Yukio Tanake, "Josephson Effect in
 Unconventional Superconductor/Luttinger Liquid/Unconventional
 Superconductor Junctions." To be published in Physica C (in press).
 Department of Applied Physics, Nagoya University, Chikusa-ku, Nagoya
 464-8603, JAPAN; telephone +81 52 789 4446; telefax +81 52 789 3298; e-
 mail <a href="mailto:hirai@rover.nuap.nagoya-u.ac.jp">hirai@rover.nuap.nagoya-u.ac.jp.</a> Key words: Josephson effect,
 Luttinger liquid, triplet superconductor, zero-energy states.
<p>
 B. W. Hoogenboom, M. Kugler, B. Revaz, I. Maggio-Aprile, O. Fischer, and
 Ch. Renner, "Shape and Motion of Vortex Cores in Bi2Sr2CaCu2O8+d."
 Departement de Physique de la Matiere Condensee, Universite de Geneve,
 24 quai Ernest-Ansermet, CH-1211 Geneve 4, SWITZERLAND; e-mail
 <a href="mailto:bart.hoogenboom@physics.unige.ch">bart.hoogenboom@physics.unige.ch;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/0002146">http://xxx.lanl.gov/abs/cond-mat/0002146.</a> 74.50.+r; 74.60.Ec; 74.60.Ge;
 74.72.Hs.
<p>
 Xiao Hu and Masashi Tachiki, "Possible Critical Point in Phase Diagrams
 of Interlayer Josephson-Vortex Systems in High-Tc Superconductors."
 Submitted to Phys. Rev. Lett. National Research Institute for Metals,
 1-2-1 Sengen, Tsukuba, Ibaraki 305 0047, JAPAN; e-mail <a href="mailto:xhu@nrim.go.jp">xhu@nrim.go.jp;</a>
 preprint also available at <a href="http://xxx.lanl.gov/abs/cond-mat/0003068">http://xxx.lanl.gov/abs/cond-mat/0003068.</a>
 74.20.De; 74.25.Bt; 74.25.Dw; 74.60.Ge.
<p>
 Chan-Joong Kim, Young A. Jee, and Gye-Won Hong, "Variables Affecting the
 Fabrication of Single Grain YBa2Cu3O7-y Superconductors by a Top-Seeded
 Melt Growth Process." To be published in Supercond. Sci. & Technol.
 Superconductivity Research Laboratory, Korea Atomic Energy Research
 Institute, P.O. Box 105, Yusung, Taejon 305-600, SOUTH KOREA; telephone
 +82 42 868 8908; telefax +82 42 862 5496; e-mail
 <a href="mailto:cjkim2@nanum.kaeri.re.kr">cjkim2@nanum.kaeri.re.kr.</a> Key words: top-seeded melt growth process,
 seed melting, surface coating, two-step undercooling, multiseeding.
<p>
 S. Kolesnik, V. Vlasko-Vlasov, U. Welp, G. W. Crabtree, T. Piotrowski,
 J. Wrobel, A. Klimov, P. Przyslupski, T. Skoskiewicz, and B. Dabrowski,
 "Flux Pinning by Anisotropic Arrays of Antidots in Superconducting Thin
 Films." To be published in 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. Department of Physics, Northern
 Illinois University, Faraday West, DeKalb, IL 60115; telephone (815)
 753-6479; telefax (815) 753-8565; e-mail <a href="mailto:kolesnik@physics.niu.edu">kolesnik@physics.niu.edu.</a>
<p>
 G. A. Levin and D. A. Chernikov, "New Software for Measurements of the
 Anisotropic Resistivity by Multiterminal Technique." Virtual
 Instruments, 150 East 39th Street, Suite 804, New York, NY 10016; e-mail
 <a href="mailto:levin@physics.kent.edu">levin@physics.kent.edu;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/0002458">http://xxx.lanl.gov/abs/cond-mat/0002458.</a>
<p>
 K. Levin, Qijin Chen, and Ioan Kosztin, "Short Coherence Length
 Superconductivity: A Generalization of BCS Theory for the Underdoped
 Cuprates." 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. James Franck Institute, University of Chicago, 5640 South
 Ellis Avenue, Chicago, IL 60637; Qijin Chen's e-mail
 <a href="mailto:qchen@rainbow.uchicago.edu">qchen@rainbow.uchicago.edu;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/0003133">http://xxx.lanl.gov/abs/cond-mat/0003133.</a>
<p>
 Ruixing Liang, D. A. Bonn, and Walter N. Hardy, "Preparation and X-Ray
 Characterization of Highly Ordered Ortho-II Phase YBa2Cu3O6.50 Single
 Crystals." To be published in Physica C (in press). Department of
 Physics and Astronomy, University of British Columbia, 6224 Agricultural
 Road, Vancouver, BC, CANADA V6T 1Z1; telephone (604) 822-1997; telefax
 (604) 822-4750; e-mail <a href="mailto:liang@physics.ubc.ca">liang@physics.ubc.ca.</a> Key words: YBa2Cu3O7-x
 cuprate, YBCO, Cu-O chains, oxygen ordering, ortho-II phase, x-ray
 diffraction. 74.72.Bk; 64.60.Cn; 61.72.Ji.
<p>
 Danmin Liu, Meiling Zhou, Yancao Hu, and Tieyong Zuo, "A Study on
 Textured Silver Tapes used as Substrate for YBCO High Temperature
 Superconductors." To be published in Physica C (in press). School of
 Materials Science and Engineering, Beijing Polytechnic University, 100
 Pingleyuan, Chaoyang District, Beijing 100022, PEOPLE'S REPUBLIC OF
 CHINA; telefax +86 10 6739 1761; e-mail <a href="mailto:weipingl@bjpu.edu.cn">weipingl@bjpu.edu.cn.</a> Key
 words: silver, biaxial {110} texture, deformation textures,
 recrystallization textures, coated conductors.
<p>
 Nie Luo, "Subtle Features in Transport Properties: Evidence for a
 Possible Coexistence of Holes and Electrons in Cuprate Superconductors."
 Department of Physics and Astronomy, Northwestern University, Evanston,
 IL 60208; e-mail <a href="mailto:nlu182@lulu.it.northwestern.edu">nlu182@lulu.it.northwestern.edu;</a> preprint also
 available at <a href="http://xxx.lanl.gov/abs/cond-mat/0003074">http://xxx.lanl.gov/abs/cond-mat/0003074.</a> 74.25.Fy;
 74.25.Jb; 74.62.Dh; 71.35.-y.
<p>
 Th. Maier, M. Jarrell, Th. Pruschke, and J. Keller, "d-Wave
 Superconductivity in the Hubbard Model." Institute of Theoretical
 Physics, University of Regensburg, D-93040 Regensburg, GERMANY;
 telephone +49 941 943 2046; telefax +49 941 943 4382; e-mail
 <a href="mailto:thomas.maier@physik.uni-regensburg.de">thomas.maier@physik.uni-regensburg.de;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/0002352">http://xxx.lanl.gov/abs/cond-mat/0002352.</a>
<p>
 I. Martin and A. V. Balatsky, "Visualizing Particle-Hole Duality in High
 Temperature Superconductors." Submitted to Nature. 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/0003142">http://xxx.lanl.gov/abs/cond-mat/0003142.</a>
<p>
 F. Maury, M. Nicolas-Francillon, F. Bouree, R. Ollitrault-Fichet, and M.
 Nanot, "Local Structural Changes in Lithium-Doped YBa2Cu3Oy." To be
 published in Physica C (in press). Laboratoire des Solides Irradies,
 Ecole Polytechnique, F-91128 Palaiseau Cedex, FRANCE; telephone +33 1
 6933 4502; telefax +33 1 6933 3022; e-mail
 <a href="mailto:fmaury@hp1sesi.polytechnique.fr">fmaury@hp1sesi.polytechnique.fr.</a> Key words: neutron diffraction, high-
 Tc compounds. 61.12.Ld; 74.72.Bk.
<p>
 A. S. Mel'nikov, I. M. Nefedov, D. A. Ryzhov, I. A. Shereshevskii, P. P.
 Vysheslavtsev, "Nonsingular Vortices in (s+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,
 603600 Nizhny Novgorod, GSP-105, RUSSIA; e-mail <a href="mailto:ryzhov@ipm.sci-nnov.ru">ryzhov@ipm.sci-nnov.ru;</a>
 preprint also available at <a href="http://xxx.lanl.gov/abs/cond-mat/0001186">http://xxx.lanl.gov/abs/cond-mat/0001186.</a>
<p>
 V. P. Mineev, "Upper Critical Field in Layered Superconductors."
 Commissariat a l'Energie Atomique, Departement de Recherche Fondamentale
 sur la Matiere Condensee, Service de Physique Statistique, Magnetisme et
 Supraconductivite, F-38054 Grenoble Cedex, FRANCE; e-mail
 <a href="mailto:mineev@drfmc.ceng.cea.fr">mineev@drfmc.ceng.cea.fr;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/0002359">http://xxx.lanl.gov/abs/cond-mat/0002359.</a>
<p>
 O. V. Misochko, "Implication of Phase-Dependent Noise of Coherent
 Phonons in YBa2Cu3O7-d." To be published in Phys. Lett. A. Institute
 of Solid State Physics, Russian Academy of Sciences, 142432
 Chernogolovka, Moscow Region, RUSSIA; e-mail <a href="mailto:misochko@issp.ac.ru">misochko@issp.ac.ru.</a> Key
 words: femtosecond pump-probe experiments, coherent phonons, high-Tc
 superconductors, squeezed and non-classical states. 74.25.Kc; 78.47.+p;
 74.72.Bk; 42.50.Dv.
<p>
 Yoshihiko Nonomura and Xiao Hu, "Evidence of First-Order Transition
 Between Vortex Glass and Bragg Glass Phases in High-Tc Superconductors
 with Point Pins: Monte Carlo Simulations." Submitted to Phys. Rev.
 Lett. National Research Institute for Metals, Tsukuba, Ibaraki 305
 0047, JAPAN; e-mail <a href="mailto:nono@nrim.go.jp">nono@nrim.go.jp;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/0002263">http://xxx.lanl.gov/abs/cond-mat/0002263.</a> 74.60.Ge; 74.62.Dh; 74.25.Dw.
<p>
 C. J. Olson and N. Gronbech-Jensen, "Depinning and Dynamic Phases in
 Driven Three-Dimensional Vortex Lattices in Anisotropic
 Superconductors." Department of Physics, University of California,
 Davis, CA 95616; telephone (530) 752-0627; telefax (530) 752-4717; e-
 mail <a href="mailto:olson@moran.ucdavis.edu">olson@moran.ucdavis.edu;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/0002064">http://xxx.lanl.gov/abs/cond-mat/0002064.</a>
<p>
 Arun Paramekanti, Mohit Randeria, T. V. Ramakrishnan, and S. S. Mandal,
 "Effective Actions and Phase Fluctuations in d-Wave Superconductors."
 Preprint #TIFR/TH/00-10; submitted to Phys. Rev. B. Tata Institute of
 Fundamental Research, Mumbai 400005, INDIA; e-mail
 <a href="mailto:arun@godot.theory.tifr.res.in">arun@godot.theory.tifr.res.in;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/0002349">http://xxx.lanl.gov/abs/cond-mat/0002349.</a> 74.20.-z; 74.20.De; 74.72.-h;
 74.25.Nf.
<p>
 A. K. Pradhan, G. D. Gu, K. Nakao, N. Koshizuka, and D. Kanjilal,
 "Enhancement of Interlayer Coupling in Bi-2212 Crystals on Heavy-Ion
 Irradiation." To be published in Phys. Rev. B. Superconductivity
 Research Laboratory, International Superconductivity Technology Center
 (ISTEC), 10-13 Shinonome 1-chome, Koto-ku, Tokyo 135, JAPAN; telefax +81
 3 3536-5714 or -5717; e-mail <a href="mailto:pradhan@istec.or.jp">pradhan@istec.or.jp.</a> 74.60.Ge; 74.60.Jg;
 74.25.Fy.
<p>
 R. Prozorov, R. W. Giannetta, A. Carrington, and F. M. Araujo-Moreira,
 "Meissner-London State in Superconductors of Rectangular Cross-Section
 in Perpendicular Magnetic Field." Submitted to Phys. Rev. B.
 Department of Physics, Loomis Laboratory of Physics, University of
 Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, IL 61801-
 3080; 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/0003003">http://xxx.lanl.gov/abs/cond-mat/0003003.</a> 74.25.Ha; 74.25.Nf.
<p>
 E. Sudhakar Reddy, J. G. Noudem, M. Tarka, and G. J. Schmitz, "Single
 Domain YBa2Cu3Oy Thick Films and Fabrics Prepared by an Infiltration and
 Growth Process." Submitted to J. Mater. Res. ACCESS e.V. Materials
 Sciences, Intzestrasse 5, D-52072 Aachen, GERMANY; telephone +49 241 80
 6726; telefax +49 241 38 578; e-mail <a href="mailto:esreddy@access.rwth-aachen.de">esreddy@access.rwth-aachen.de.</a>
<p>
 R. A. Ribeiro, O. F. de Lima, T. Puig, B. Martinez, and X. Obradors,
 "Study of Collective Flux Creep in Directionally Solidified YBCO."
 Submitted to the Proc. of the Fourth European Conf. on Appl. Supercond.
 (EUCAS'99), Barcelona, Spain, Sept. 14-17, 1999; to be published in the
 Inst. of Physics Conf. Series. Instituto de Fisica "Gleb Wataghin,"
 Universidade Estadual de Campinas (UNICAMP), 13083-970 Campinas, SP,
 BRAZIL.
<p>
 Juergen Roehler, "The Underdoped-Overdoped Transition in YBa2Cu3Ox." To
 be published in 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. II. Physikalisches Institut, Universitaet zu
 Koeln, Zuelpicherstr. 77, D-50937 Koeln, GERMANY; e-mail <a href="mailto:abb12@Uni">abb12@Uni-</a>
 Koeln.de; preprint also available at <a href="http://xxx.lanl.gov/abs/cond">http://xxx.lanl.gov/abs/cond-</a>
 mat/0003116.
<p>
 Edson Sardella, "Elastic Properties of the Vortex Lattice for a
 Superconducting Film of Finite Thickness." Departamento de Fisica,
 Faculdade de Ciencias, Universidade Estadual Paulista, Caixa Postal 473,
 17033-360 Bauru-SP, BRAZIL; e-mail <a href="mailto:sardella@email.fc.unesp.br">sardella@email.fc.unesp.br;</a> preprint
 also available at <a href="http://xxx.lanl.gov/abs/cond-mat/0002344">http://xxx.lanl.gov/abs/cond-mat/0002344.</a> 74.60.Ec;
 74.60.Ge.
<p>
 Masatoshi Sato and Mahito Kohmoto, "Mechanism of Spin-Triplet
 Superconductivity in Sr2RuO4." Institute for Solid State Physics,
 University of Tokyo, Roppongi 7-22-1, Minato-ku, Tokyo 106, JAPAN; e-
 mail <a href="mailto:msato@issp.u-tokyo.ac.jp">msato@issp.u-tokyo.ac.jp;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/0003046">http://xxx.lanl.gov/abs/cond-mat/0003046.</a> 74.20.-z; 74.20.Fg.
<p>
 E. Schachinger and J. P. Carbotte, "Coupling to Spin Fluctuations from
 Conductivity Scattering Rates." Submitted to Phys. Rev. Lett. Institut
 fuer Theoretische Physik, Technische Universitaet Graz, A-8010 Graz,
 AUSTRIA; e-mail <a href="mailto:schachinger@itp.tu-graz.ac.at">schachinger@itp.tu-graz.ac.at;</a> preprint also available
 at <a href="http://xxx.lanl.gov/abs/cond-mat/0002283">http://xxx.lanl.gov/abs/cond-mat/0002283.</a>
<p>
 T. Schmauder, A. Waldauf, H. Wald, and P. Seidel, "Influence of Target-
 Substrate Angle on Properties of Laser Deposited YBa2Cu3O7-d Thin Films
 and Step-Edge Josephson Junctions." To be published in Physica C (in
 press). Institut fuer Festkoerperphysik, Friedrich-Schiller-
 Universitaet Jena, Helmholtzweg 5, D-07743 Jena, GERMANY; telefax +49
 3641 947412; e-mail <a href="mailto:torsten@ifk.uni-jena.de">torsten@ifk.uni-jena.de.</a> Key words: laser
 deposition, YBCO, thin films, Josephson junctions. 68.35.Bs; 68.55.-a;
 74.72.Bk; 74.76.Bz; 81.10.Bk; 81.15.Fg; 85.25.Cp.
<p>
 A. C. Sharma and K. N. Vyas, "Normal State Dynamical Conductivity of
 Layered Superconductors." To be published in Physica C (in press).
 Department of Physics, Faculty of Science, The Maharaja Sayajirao
 University of Baroda, Vadodara 390 002, INDIA. Key words: normal
 state, dynamical conductivity, layered superconductors. 74.80.Dm.
<p>
 Yu. M. Shukrinov, A. Namiranian, and A. Najafi, "Modeling of Tunneling
 Spectroscopy in HTSC." Submitted to Phys. Rev. B. Institute for
 Advanced Studies in Basic Science, Gava Zang, Zanjan 45195-159, IRAN; A.
 Najafi's e-mail <a href="mailto:najafi@iasbs.ac.ir">najafi@iasbs.ac.ir;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/0002077">http://xxx.lanl.gov/abs/cond-mat/0002077.</a>
<p>
 J. Sosnowski, M. Rabara, K. Demachi, and K. Miya, "The Influence of the
 Pinning Centers Form on the I-V Characteristics of the HTc
 Superconductors." To be published in Supercond. Sci. & Technol.
 Electrotechnical Institute, ul. Mieczyslawa Pozaryskiego 28, 04-703
 Warsaw, POLAND; telephone +48 22 812 0021; telefax +48 22 615 7535; e-
 mail <a href="mailto:iel@iel.waw.pl">iel@iel.waw.pl.</a> Key words: high-temperature superconductivity,
 flux pinning, critical current. 74.60.Ge; 74.60.Jg.
<p>
 HongLi Suo, Jean-Yves Genoud, Michael Schindl, Eric Walker, Thomas
 Tybell, Francois Cleton, Meiling Zhou, and Rene Fluekinger, "Stable
 {110}<112> Textured Ag Ribbons for Biaxially Aligned YBa2Cu3O7-d Coated
 Tapes." To be published in Supercond. Sci. & Technol. Ecole de
 Physique, Departement de Physique de la Matiere Condensee, Universite de
 Geneve, 24 quai Ernest-Ansermet, CH-1211 Geneva 4, SWITZERLAND;
 telephone +41 22 702 6578; telefax +41 22 702 6869; e-mail
 <a href="mailto:Hongli.Suo@physics.unige.ch">Hongli.Suo@physics.unige.ch.</a> Key words: secondary recrystallization,
 selective grains growth, {110}<uvw> texture, twinning rotation,
 epitaxial growth, thick films, coated tapes, superconducting tapes.
<p>
 F. Tafuri and J. R. Kirtley, "Evidence for Broken Time-Reversal Symmetry
 in YBa2Cu3O7-d Thin Films." Submitted to Phys. Rev. Lett. Dip. di
 Ingegneria dell'Informazione, Seconda Universita di Napoli, Aversa (CE)
 and INFM-Dip. di Scienze Fisiche, Universita di Napoli "Federico II," I-
 80125 Napoli, ITALY; J. R. Kirtley's e-mail at IBM, Yorktown Heights,
 <a href="mailto:kirtley@watson.ibm.com">kirtley@watson.ibm.com;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/0003106">http://xxx.lanl.gov/abs/cond-mat/0003106.</a>
<p>
 K. Tanaka and F. Marsiglio, "The Anderson Prescription for Surfaces and
 Impurities." Preprint #Alberta-Thy 01-00. Department of Physics,
 University of Alberta, Edmonton, Alberta, CANADA T6G 2J1; e-mail
 <a href="mailto:ktanaka@phys.ualberta.ca">ktanaka@phys.ualberta.ca;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/0003090">http://xxx.lanl.gov/abs/cond-mat/0003090.</a>
<p>
 Matthias Vojta, Chiranjeeb Buragohain, and Subir Sachdev, "Impurity Spin
 Dynamics in 2D Antiferromagnets and Superconductors." 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. Department of Physics, Yale University, P.O. Box 208120,
 New Haven, CT 06520-8120; e-mail <a href="mailto:matthias.vojta@yale.edu">matthias.vojta@yale.edu;</a> preprint also
 available at <a href="http://xxx.lanl.gov/abs/cond-mat/0002316">http://xxx.lanl.gov/abs/cond-mat/0002316.</a>
<p>
 Matthias Vojta, Chiranjeeb Buragohain, and Subir Sachdev, "Quantum
 Impurity Dynamics in Two-Dimensional Antiferromagnets and
 Superconductors." To be published in Phys. Rev. B. Department of
 Physics, Yale University, P.O. Box 208120, New Haven, CT 06520-8120; e-
 mail <a href="mailto:matthias.vojta@yale.edu">matthias.vojta@yale.edu;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/9912020">http://xxx.lanl.gov/abs/cond-mat/9912020.</a>
<p>
 Z. Y. Weng, D. N. Sheng, and C. S. Ting, "Understanding HTS Cuprates
 Based on the Phase String Theory of Doped Antiferromagnet." To be
 published in 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. Texas Center for Superconductivity, University of Houston,
 Houston, TX 77204-5932; 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/0003034">http://xxx.lanl.gov/abs/cond-mat/0003034.</a>
<p>
 H. Xin, D. E. Oates, S. Sridhar, G. Dresselhaus, and M. S. Dresselhaus,
 "Observation of Individual Josephson Vortices in YBCO Bicrystal Grain-
 Boundary Junctions." Submitted to Phys. Rev. B. Contact D. E. Oates,
 Lincoln Laboratory, Massachusetts Institute of Technology, 244 Wood
 Street, Lexington, MA 02420-9108; telephone (781) 981-4707; telefax
 (781) 981-5328; e-mail <a href="mailto:oates@ll.mit.edu">oates@ll.mit.edu;</a> preprint also available at
 <a href="http://xxx.lanl.gov/abs/cond-mat/0003058">http://xxx.lanl.gov/abs/cond-mat/0003058.</a>
<p>
 Shi-Jie Xiong and Ye Xiong, "Diffusion Behavior of Quasiparticles in
 Two-Dimensional Disordered Superconductors with s + id Pairing
 Symmetry." To be published in Physica C (in press). National
 Laboratory of Solid State Microstructures and Department of Physics,
 Nanjing University, Nanjing 210093, PEOPLE'S REPUBLIC OF CHINA; telefax
 +86 253 326 028; e-mail <a href="mailto:sjxiong@nju.edu.cn">sjxiong@nju.edu.cn.</a> Key words: pairing
 symmetry, disorder, localization. 74.20.-z; 72.10.Bg; 74.50.+r.
<p>
 F. Yakhou, J.-Y. Henry, P. Burlet, V. P. Plakhty, M. Vlasov, and S.
 Moshkin, "Oxygen Ordering and the 60 K Plateau in the Ortho-II Phase of
 YBa2Cu3O6+x (0.48 <= x <= 0.62)." To be published in Physica C (in
 press). European Synchrotron Radiation Facility, B. P. 220X, F-38043
 Grenoble Cedex, FRANCE; telephone +33 76 88 3738; e-mail <a href="mailto:yakhou@esrf.fr">yakhou@esrf.fr.</a>
 Key words: YBCO, ortho-II phase, oxygen ordering, thermal treatment.
 74.72.-h; 81.40.-z.
<p>
 Hsiao-Wen Yu, Ming-Jye Chen, H. C. Yang, S. Y. Yang, and H. E. Horng,
 "Effect of the Grooved SrTiO3 Bicrystal Line on the YBa2Cu3O7 Grain
 Boundary." To be published in Physica C (in press). Department of
 Physics, National Taiwan University, Taipei 106, Taiwan, REPUBLIC OF
 CHINA; telephone +886 2 2362 6937, ext. 101; telefax +886 2 2363 9984;
 e-mail <a href="mailto:d3202005@ms.cc.ntu.edu.tw">d3202005@ms.cc.ntu.edu.tw.</a> Key words: meandering grain
 boundary, grooved bicrystal line, microstructure of the grain boundary,
 SQUID. 74.50.+r.
<p>
 Li-yuan Zhang, Chun-lei Liu, Xiao-qiang Yang, and Qiang Han,
 "Thermoelectric Power and Hall Effect of High-Tc Superconductors in a
 Two-Component Model." To be published in Physica B. Department of
 Physics, Peking University, Beijing 100871, PEOPLE'S REPUBLIC OF CHINA;
 telefax +86 10 6275 1615; e-mail <a href="mailto:zhangly@mail.phy.pku.edu.cn">zhangly@mail.phy.pku.edu.cn.</a> Key
 words: thermoelectric power, Hall effect, metal.
 <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>
 *May 22 - June 2, 2000: NATO-ASI Modern Trends in Magnetostriction
 Study & Application, Kiev, Ukraine. Objectives: (1) to determine the
 state of the art of the basic and applied research of magnetostriction
 and related phenomena, (2) to define and prioritize directions of
 investigation for the future, (3) to consider new materials for common
 applications of magnetostriction-based devices, and (4) to formulate new
 perspectives on magnetostriction phenomena and applications, using
 advances in materials design and technology. For information, contact
 Institute for Low Temperature Physics & Engineering, 47 Lenin Avenue,
 310164 Kharkov, Ukraine; telephone +380 572 321 223; telefax +380 572
 322 370; e-mail <a href="mailto:ASI-2000@ilt.kharkov.ua">ASI-2000@ilt.kharkov.ua.</a>
<p>
 *May 28 - June 2, 2000: International Conference on Transport Processes
 in Inorganic Materials: Fundamentals to Devices, Venice (Jesolo Beach),
 Italy. Objective is to discuss recent developments in microscopic
 mechanisms of transport in different inorganic materials; assess the
 role of transport in materials reactivity, synthesis, and processing;
 explore the transport mechanisms which affect materials properties and
 behavior under operating conditions; and exploit the role of transport
 processes in a number of advanced technologies of current or emerging
 interest. Papers to be presented in several areas, including diffusion
 and transport in media of lower dimensionality, single-crystal growth,
 materials processing for HTS materials, and superconducting devices for
 high- and low-field appli-cations. For information, contact CIMTEC-
 Transport Phenomena Conference, P.O. Box 174, I-48018 Faenza, Italy;
 telefax +39 0546 664138.
<p>
 June 5 - 9, 2000: XVII Sitges Conference on Statistical Mechanics
 (SITGES Euroconference) -- Coherent Structures in Classical Systems,
 Sitges, Barcelona, Spain. Conference will be centered in statistical
 and dynamical aspects of classical systems presenting coherent
 structures or patterns, with special emphasis on those appearing in the
 following fields: combustion, turbulence, patterns in fluids, crystal
 growth, granular flow, and biological systems. Number of participants
 limited to 100. Conference can provide financial support to selected
 young researchers from EC countries (age below 35). For further
 information contact Prof. Miguel Rubí, Dept. Física Fonamental,
 Universitat de Barcelona, Av. Diagonal, 647, E-08028 Barcelona, SPAIN;
 telephone +34 93 402 11 62; telefax +34 93 402 11 49; e-mail
 <a href="mailto:sitges17@precario.ffn.ub.es">sitges17@precario.ffn.ub.es;</a> Web site <a href="http://precario.ffn.ub.es/~sitges">http://precario.ffn.ub.es/~sitges</a>
 or <a href="http://www.ffn">http://www.ffn.</a> ub.es/~sitges.
<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 1 - 6, 2000: Future Perspectives of Superconducting Josephson
 Devices -- EuroConference on Physics and Applications of Multi-Junction
 Supercon-ducting Josephson Devices, Aquafredda di Maratea, Italy. The
 conference will be dedicated to an advanced discussion of the present
 state-of-the-art and future perspectives of superconducting Josephson
 electronic devices with particular attention to their impact in
 technological and industrial applications. Sessions will provisionally
 include physics of superconducting Josephson devices, flux-flow and
 high-frequency devices, low-frequency devices and SQUIDs, RSFQ devices,
 and unconventional applications. Maximum 100 participants. A number of
 grants available for young scientists from European Community countries
 and Associated States. To apply, contact Josip Hendekovic, 2 quai Lezay-
 Marnésia, F-67080 Strasbourg Cedex, France; telephone +33 388 76 71
 35; telefax +33 388 36 69 87; e-mail <a href="mailto:euresco@esf.org">euresco@esf.org;</a> Web site
 <a href="http://www.esf.org/euresco/">http://www.esf.org/euresco/.</a>
<p>
 *July 1 - 9, 2000: 6th Advanced Studies on Superconducting Engineering
 (ASSE2000), Eger, Hungary. Detailed studies on the newest results and
 their engineering aspects both in fundamental research and applications
 of high-temperature superconductors. The main frame is a series of
 lectures held by well-known scientists, researchers, engineers, and
 experts. After lectures, the unique ³Club of Scientists² will be
 organized to provide time for free discussions. The last three days of
 the Studies will be devoted to a workshop for each participant willing
 to present the results of her/his work. The purpose of ASSE2000 is: to
 introduce a wide range of aspects of superconducting engineering to
 interested people; to get together researchers, engineers, students,
 lecturers, and scientists to discuss new results and ideas in the HTS
 field; and to make new friendships and create a partnership among
 participants. After ASSE2000, a special two-day (July 10-11, 2000)
 satellite workshop will be held on Superconducting Flywheels -- all
 participants are invited to attend. Contact Dr. István Vajda,
 Department of Electrical Machines and Drives, Technical University of
 Budapest, H-1111 Budapest, Egry Jozsef u. 18., Hungary; telephone +36 1
 463-2961; telefax +36 1 463-3600, e-mail <a href="mailto:vajda@supertech.vgt.bme.hu">vajda@supertech.vgt.bme.hu.</a>
<p>
 *July 3 - 28, 2000: United States Summer School in Condensed Matter and
 Materials Physics, Boulder, Colo. New summer school for graduate
 students and postdocs in condensed-matter and materials physics has been
 established and will be held annually in Boulder. This first one is
 entitled Introduction to Superconductivity: Fundamentals and
 Applications. Main themes of the school will be basic principles of
 superconductivity, quantum dynamics of vortices and electrons, vortices
 in D > 2 and critical phenomena in superconductors, high-temperature and
 other unconventional superconductors, physics and applications of vortex
 dynamics, nonequilibrium super-conductivity, mesoscopic and nanoscale
 superconducting systems, materials, applications, and devices.
 Application deadline, May 1, 2000. Most local expenses will be covered
 by the summer school (supported by the National Science Foundation,
 University of Colorado at Boulder, NIST, and Lucent). For further
 information, contact Z. Tesanovic, Department of Physics and Astronomy,
 315 Bloomberg Center, Johns Hopkins University, 3400 North Charles
 Street, Baltimore, MD 21218-2686; telephone (410) 516-5391; telefax
 (410) 516-7239; e-mail <a href="mailto:cmsummer@">cmsummer@</a> pha.jhu.edu or <a href="mailto:zbt@pha.jhu.edu">zbt@pha.jhu.edu.</a> For
 details and application forms see Web site
 <a href="http://www.indiana.edu/~uscmpsc/">http://www.indiana.edu/~uscmpsc/.</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
 December 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>
 RESOURCES
<p>
 Information
<p>
 New Book: Introduction to Unconventional Superconductivity, by V. P.
 Mineev and K. Samokhin. Unconventional superconductivity (or
 superconductivity with a nontrivial Cooper pairing) is believed to exist
 in many heavy-fermion materials as well as in high-temperature
 superconductors, and is a subject of great theoretical and experimental
 interest. This book is intended to meet this information need and
 includes the authors' original results. Contents divided into two
 parts: Part I -- Cooper pairing, spin states of pairs, superfluid
 helium-3 phases, superconducting states in crystals, energy of
 elementary excitations, energy gap and critical temperature, low-
 temperature behavior of thermodynamical values, manifestations of parity
 of electrons number, spin susceptibility and Knight shift, Landau
 expansion of free energy, multicomponent superconducting states,
 Ginzburg-Landau equations and the problem of upper critical field,
 boundary conditions and surface superconductivity, Meissner and mixed
 states in unconventional superconductors, magnetic superconductors, and
 Josephson effect. Part II: Gor'kov Equations, Ginzburg-Landau
 functional, upper critical field in p-wave superconductors, boundary
 conditions for the order parameter, influence of impurities, and thermal
 conductivity of unconventional superconductors. Readership:
 Researchers in theoretical physics, especially condensed matter and
 superconductivity. Publ. 1999; 200 pp.; price $68,; ISBN 90-5699-209-0.
 Contact Gordon and Breach Science Publishers, PTT, P.O. Box 566,
 Williston, VT 05495-0080; telephone (800) 326-8917; telefax (802) 864-
 7626; e-mail <a href="mailto:book.orders@aidcvt.com">book.orders@aidcvt.com;</a> Web site <a href="http://www.gbhap.com">http://www.gbhap.com.</a>
 <hr>
<p>
 High-Tc Update is the high-Tc superconductivity information exchange
 newsletter. Please send 1) preprints, reprints, and other research
 reports; 2) descriptions of on-going work; 3) meeting announcements and
 summaries.
<p>
 The information contained herein is intended for limited distribution.
 Readers are expected to respect the rights of the authors.
<p>
 Please address all contributions and inquiries to:
 Dr. Sreeparna Mitra, A219 Physics
 Ames Laboratory/Iowa State University
 Ames, Iowa 50011-3020
 Telephone: (515) 294-3877 Telefax: (515) 294-1134
 E-mail: <a href="mailto:MITRA@AMESLAB.GOV">MITRA@AMESLAB.GOV</a> or <a href="mailto:MITRA@IASTATE.EDU">MITRA@IASTATE.EDU</a>
<p>
 Project Director/Editor: Sreeparna Mitra
 Science Editor: John R. Clem
 High-Tc Update, Vol. 14, #7, April 1, 2000
 <hr>