Published for the Division of Materials Sciences, Office of Basic Energy Sciences, USDOE, under Contract W-7405-eng-82 with the Ames Laboratory, Iowa State University. Funded by DMS/BES/USDOE, ARPA, ONR, NSF, EPRI, and other agencies, organizations, and individuals.

The High-Tc Update web page is located at the URL http://www.iitap.iastate.edu/htcu/htcu.html

PLEASE NOTE: Issues of High-Tc Update from November 15, 1993, onward are also available in coded Word versions (BINHEX and RTF). (These versions preserve the Greek letters, special characters, accents, etc.) If you are interested in the alternate formats, contact the editor for information.

PLEASE READ: The electronic-mail version of High-Tc Update is generated from a Macintosh Microsoft Word file and turned into a text file that can be transferred electronically. Formatting commands, Greek symbols, diacritical marks, etc. are lost in this transformation. In order to improve the readability of the e-mail version, the newsletter staff add explanatory marks as needed to the text file. For example, a carat (10^5) indicates a superscript (ten to the fifth). A carat followed by a bracket (cm^[-2]) indicates everything within the brackets is superscripted (centimeter to the minus 2). A bracket followed by a carat ([18]^O) indicates everything before the carat is superscripted. An underline (M_i) indicates a subscript (M subscript i). Most Greek letters are spelled out (Delta, mu, tau, pi, Omega), although delta is left as "d." In most instances, easily recognizable formulas or units are left as they appear: Tc, Jc, YBa2Cu3O7, O2. Mu-m is changed to micrometers. Diacritical marks (accents, tildes, carats, etc.) are removed, but the German umlaut (e.g., a, o, or u with two dots over it) is changed into a, o, or u followed by e. If needed for clarity, hyphens are occasionally inserted between spelled-out Greek letters or symbols (ohm-cm, sin-theta).

NOTA BENE: The following Nota Bene is contributed by Douglas K. Finnemore, Distinguished Professor and Chair of Physics, Iowa State University, and Senior Physicist at the Ames Laboratory. Our Science Editor, John R. Clem, is still on travel!

Also Note: Our Web address has been updated to http://www.iitap.iastate.edu/htcu/htcu.html. The old address will still work for some time, but will be phased out eventually.

General

The effect of both oxygen stoichiometry and zinc doping on the thermal conductivity of YBCO has been studied by M. Houssa et al. (Liege). An electronic model which considers the effect of the position of the Fermi level with respect to the energy of the Van Hove singularities describes many aspects of the data. The data shows that the Cu(2) valence and thus the charge density in the planes is closely related to the critical temperature.

Thermal conductivity along the a-b plane of a c-axis aligned Bi-2223 crystal has been measured by M. Matsukawa (Iwate) et al. in magnetic fields up to 14 T. They find good agreement with the Kadanoff-Martin expression taking into account quasiparticle-quasiparticle scattering in the core of the vortices.

Thermal conductivity measurements by N. P. Ong (Princeton) et al. show a rapid suppression with magnetic field. The experiments suggest that this field suppression arises from a quantum decoherence effect for the kappa data below Tc.

A preprint by T. Plackowski et al. (Wroclaw) reports thermal conductivity measurements for SmBa2Cu3O7-d that has been oxidized at 250 bar. The sample oxidized at high pressure showed a much higher room- temperature thermal conductivity as well as a much higher maximum just below the superconducting transition.

Thermally activated dynamics of the tilts of the CuO6 octahedra in La2CuO4+d have been reported by G. Cannelli (Calabria) et al. At a frequency of 280 Hz, intense maxima are found between 150 K and 320 K. The activation enthalpy is found to be 0.23 eV.

Low temperature resistivity of single crystal YBCO has been studied by V. F. Gantmakher (Chernogolovka) et al. A scan of the superconductor- nonsuperconductor transformation was done in two alternative ways, namely by applying a magnetic field and by reducing the hole concentration. The changes in hole concentration were carried out by a quenching and aging procedure. The in-plane resistivity obtained in both cases can be fitted by a logarithmic law in the temperature range of almost two decades. The c-axis conductivity, however, followed a power law and neither sigma_c nor rho_c could be fitted by a log T. It follows from the rho_c measurements that the transformation at T = 0 found by extrapolating the data is split into two transitions: superconductor-normal metal and normal metal-insulator.

Pair Symmetry

Pairing symmetry in Tl-2201 thin films has been studied by M. Willemin (IBM-Zurich) et al. using in-plane torque anisotropy. They find a reversible torque with a four-fold symmetry added to a two-fold symmetry giving bulk evidence for a d+s pairing state.

The influence of the wave function symmetry on superconducting devices has been discussed by J. Mannhart et al. (Augsburg). The disappearance of the gap along certain directions has a profound influence on the surface impedance of rf devices such as resonators and filters. The angular dependence of the critical currents in Josephson junctions controls the performance of detectors based on the Josephson effect.

Vortices

Point-like and line-like melting of the vortex lattice in the universal phase diagram of layered superconductors has been studied by A. E. Koshelev (Argonne). It is found that the melting occurs when the Josephson energy is suppressed to 64% of its bare value.

Threading dislocation lines in two-sided flux array decoration experiments have been studied by M.-C. Miguel et al. (MIT). Calculations show that the lines behave as anisotropic and dispersive strings with larger thermal fluctuations along its Burger's vector.

A preprint by S. Sarti (Rome) et al. describes the angular dependence of the fluctuation dissipation in YBCO thin films. They conclude that in a wide portion of the H-T plane, the dissipation is due to solely intrinsic properties such as order-parameter fluctuations and flux flow while pinning becomes important only at low temperatures.

Basic Mechanism

Changes in the normal-state NMR and NQR data for the Cu, O, and Y isotopes of YBCO have been used by A. Suter (U. of Zurich) et al. to show that there may be an electronic crossover at about 180 K. This crossover may involve charge fluctuations in the planes and chains accompanied by a hole transfer from the chain to the plane. A charge- density-wave mechanism is discussed.

Superconductivity and Magnetism

The occurrence of high Tc in weak ferromagnets is discussed in a preprint by E. B. Sonin (Jerusalem) et al. They find that vortices form spontaneously from the field of the ferromagnetism at temperatures just below Tc for R1.5Ce0.5Sr2Cu2O10. Below a temperature, T_d, the more conventional diamagnetic response arises where additional vortices arise from the external field.

Theory

The theory of electronic Raman spectra has been extended by M. T. Beal- Monod (Orsay) et al. to analyze data for both orthorhombic YBCO and tetragonal Hg-1212. They find a significant s-wave component in Hg-1212 suggesting a spontaneous breakdown of the tetragonal symmetry in the superconducting phase of this compound.

The effects of low energy excitations on the dynamics of the Josephson phase in SNS junctions was investigated by K. Awaka et al. (Tokyo). Retardation effects due to low-energy excitations in the normal region are seen to play important roles in the dynamics of the phase.

A fast method to calculate the current patterns in a flat conductor from a measurement of their magnetic field has been developed by R. J. Wijngaarden et al. (Amsterdam). They find an increase in speed for 512x512 pixels to be a factor of 135.

A theory has been developed by G. Hildebrand (Wuerzburg) et al. for the effects of electronic correlations on the thermoelectric power of the cuprates. They find that the characteristic maximum in S as a function of temperature can be explained by the momentum dependence of the single-particle scattering rate.

A preprint by J. R. Engelbrecht (Boston College) et al. studies pseudogap behavior above Tc in a model with d_[x^2-y^2] pairing. Using a self-consistent, conserving formulation, they show that pairing correlations above Tc leads to the appearance of a highly anisotropic pseudogap in the electronic spectral function and the destruction of the Fermi surface.

The Landau levels and quasiparticle spectrum of extreme type-II superconductors have been studied by Z. Tesanovic et al. (Johns Hopkins) in the high-field limit. They find a gapless spectrum separated from the low-field regime by a quantum-level crossing transition. The resulting low-level excitations should be observable in thermodynamic and transport measurements.

A prediction that (Cm,Th)2Sr2Ca2NbOx and (Gd,Ce)2Sr2Cu2TiOx will superconduct has been made by H. A. Blackstead (Notre Dame) et al. The prediction is based on a charge-reservoir model of superconductivity.

Tapes

In two papers describing the preparation of Bi-2223 tapes for magnet conductors, W. G. Wang et al. (Wollongong) have shown that details of the cool-down after reaction to form the Bi-2223 phase can be an extremely important factor determining the final critical current performance. Samples that are reacted at 840^oC to form Bi-2223 show small amounts of Bi-2201 precipitates, and the presence of these precipitates tend to degrade the critical current. A post-reaction anneal at 820^oC will remove this Bi-2201 and raise the critical current. If post-reaction anneal is done at 780^oC, however, a dense array of the Pb-rich 3221 phase precipitates is formed that further degrades the critical current.

A study of the enhancement of the critical current density by proton- induced fission tracks in Bi-2223 tape conductors was carried out by R. C. Budhani (Brookhaven) et al. There is a substantial enhancement of the flux pinning. There is, however, a trade-off between the pinning enhancement and deleterious effects of radiation damage at high fluence.

A preprint by U. Balachandran (Argonne) et al. describes an effective method of fabrication conductors with a very high Ag to Bi-2223 interfacial area. A Ag wire is placed in the center of a Ag tube with the oxide powder packed between them. When the composite is pressed and heat treated, critical current densities of 2 x 10^5 A/cm^2 are found.

Pulsed-current studies of Jc in Bi-2223 conductors were carried out by J. G. Noudem (Grenoble) et al. for pulse durations of 1.25 to 20 milliseconds. They present a detailed study of the heat deposited and the changes in the E vs. J curves.

Melt-Processed YBCO Materials

A systematic study of the changes in performance of REBa2Cu3Oy melt- processed materials have been carried out by M. Muralidhar (ISTEC) et al. to find the effect of mixing different combinations of three rare- earth elements. A Jc value of 50,000 A/cm^2 at 77 K and 2 T was achieved for (Nd,Eu,Gd)Ba2Cu3Oy for the field parallel to the c axis.

Processing and characterization of YBCO grain boundaries obtained by a liquid phase removal method was carried out by K. Salama et al. (Houston). The results imply that the strength of the boundary depends not only on the misorientation angle, but also on the extent of oxygen distribution along the boundary.

Using a seeded melt-growth method, D. Shi (Cincinnati) et al. produced single-domain YBCO samples with high levitation forces and trapped fields. Surface nucleation has been suppressed when the top sample surface is coated with low melting compounds.

Other Cuprates

Synthesis of (Hg,Bi)Ba2Ca2Cu3Ox on Au and Ag substrates has been studied by P.V.P.S.S. Sastry et al. (Tallahassee). Using Bi2CuO4 as a Bi source combined with BaCaCuO precursor phase assemblages allowed the formation of some liquid phase during the reaction and resulted in a dense (Hg,Bi)Ba2Ca2Cu3Ox sample with aligned colonies of grains.

A preprint by W. Prellier et al. (Caen) describes procedures to make tailored superlattices containing distinct oxide and oxycarbonate blocks grown by pulsed laser deposition. Several unit cells of SrCuO2 could be inserted between layers of Ba2-xCaxCuO2CO3.

Artificially layered films also have been reported by F. Arciprete et al. (Rome) for layer combinations of SrCuO2/BaCuO2 and CaCuO2/BaCuO2. A (BaCuO2)2/(CaCuO2)n film shows a full transition with Tc (zero resistance) up to 46 K.

Surface Impedance

Microwave surface impedance has been reported by A. Andreone (Naples) et al. for Bi-2212 that has been grown by liquid phase epitaxy on LaAlO3 substrates. The films show some granularity, and the microwave power dependence of the surface impedance shows evidence for vortex penetration in weak links inside the film.

Reviews

Characteristic features of exotic superconductors have been reviewed by B. Brandow (Los Alamos). This is a broad review that emphasizes superconductors in which Tc ~lambda^[-2]and follows some of the work of Uemura and coworkers. The paper reviews a wide range of material including all high Tc, the organics and heavy-fermion superconductors, and looks for common phenomena that might indicate the mechanism that may cause superconductivity.

Contributed by Douglas K. Finnemore

Contents: Technology News is on page 4; Preprints begin on page 4; Coming Events begin on page 9; Resources are on page 10; and Donors are listed on page 11.

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.

TECHNOLOGY NEWS (Also see Applications section of Nota Bene.)

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.

A new company, Nordic Superconductor Technologies A/S, a wholly owned subsidiary of NKT Reseach Center (Denmark), has been established as Europe's first commercial supplier of ceramic superconductors. The company will manufacture and market Bi2Sr2Ca2Cu3O8+d tapes. For further information, contact Per Vase, Nordic Superconductor Technologies, Priorparken 878, DK-2605, Brondby, Denmark; telephone +45 43 48 2500; telefax +45 43 48 3592; e-mail p.vase@nst.com; Web site http://www.nst.com.

Contributed by Sreeparna Mitra

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.

A. N. Akimov, L. A. Vlasukova, G. A. Gusakov, F. F. Komarov, M. Kulik, A. Latuszynski, and D. Maczka, "Structure-Phase Transformation Under Ion Implantation into GaAs." Preprint #E17-97-42. Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, RUSSIA; telefax +7 095 975 23 81.

K. M. Amm, P.V.P.S.S. Sastry, D. C. Knoll, S. C. Peterson, and J. Schwartz, "Effects of Au Interface on (HgBi)Ba2Ca2Cu3Ox Superconductor." To be published in J. Supercond. National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310. Key words: Hg superconductors, HgBa2Ca2Cu3Ox, gold-superconductor interface, magnetization data.

A. Andreone, C. Aruta, A. Cassinese, F. Palomba, R. Vaglio, G. Balestrino, and E. Milani, "Microwave Surface Impedance Measurements of Epitaxial Bi2Sr2CaCu2O8+x Films Grown by LPE." Submitted to Physica C. INFM-Dipartimento di Scienze Fisiche, Universita di Napoli Federico II, Piazzale Tecchio 80, I-80125 Napoli, ITALY; telephone +39 81 768 2423; telefax +39 81 239 1821; e-mail andreone@na.infn.it. Key words: Bi2Sr2CaCu2O8+x superconducting films, surface impedance measurements. 74.76.Bz; 74.72.Hs; 74.25.Nf.

F. Arciprete, G. Balestrino, S. Martellucci, P. G. Medaglia, A. Paoletti, and G. Petrocelli, "Electrical Transport Properties of Artificially Layered Films of [BaCuO2]2/[(Sr,Ca)CuO2]n." To be published in Appl. Phys. Lett. (in press). INFM-Dipartimento di Scienze e Technologie Fisiche ed Energetiche, Universita di Roma "Tor Vergata", via della Ricerca Scientifica, I-00133 Roma, ITALY; G. Balestrino's telephone +39 6 7259-7147 or -7148; telefax +39 6 7259-7145; e-mail balestrino@tovvx1.ccd.utovrm.it.

Kaoru Awaka and Hidetoshi Fukuyama, "Effects of Low Energy Excitations in SNS Junction on the Dynamics of Josephson Phase." To be published in J. Phys. Soc. Jpn. Texas Instruments Tsukuba Research and Development Center Limited, 17 Miyukigaoka, Tsukuba, Ibaraki 305, JAPAN; telephone +81 298 501770; telefax +81 298 501779; e-mail awaka@trdc.ti.com; preprint also available at cond-mat@xxx.lanl.gov (#9705198). Key words: SNS junction, self-consistent harmonic approximation, retardation effect, tunneling.

U. Balachandran, A. N. Iyer, M. Lelovic, T. Deis, N. G. Eror, and P. Haldar, "Recent Developments in the Fabrication of High-Jc Ag-Clad (Bi,Pb)2Sr2Ca2Cu3Oy Conductors." To be published in the Proc. of the Symp. on High-Temp. Supercond. (Spring TMS Meeting) in Orlando, Fla., Feb. 9-13, 1997. Contact Janice Coble, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439; telefax (708) 252-9595; e- mail janice_coble@qmgate.anl.gov.

M. T. Beal-Monod, J. B. Bieri, and K. Maki, "Electronic Raman Spectra for d+s Wave Superconductivity." Submitted to Europhys. Lett. Laboratoire de Physique des Solides, Universite Paris-Sud, Batiment 510, F-91405 Orsay Cedex, FRANCE; telephone +33 1 69 15-6928 or -6750; telefax +33 1 69 15-6086.

Michael D. Bentzon, Daniel Suchon, Peter Bodin, and Per Vase, "Contactless Characterization of BSCCO Tape." Presented at the 3rd European Conf. on Appl. Supercond. (EUCAS'97), Veldhoven, The Netherlands, June 30-July 3, 1997. Nordic Superconductor Technologies, Priorparken 878, Sognevej 11, DK-2605 Brondby, DENMARK; telephone +45 43 48 35 00; telefax +45 43 63 00 99.

V. Betz, B. Holzapfel, G. Sipos, W. Schmidt, N. Mattern, and L. Schultz, "Growth Mechanisms for In-Plane Aligned YSZ Buffer Layers Deposited on Polycrystalline Metallic Substrates by Ion-Beam Assisted Laser Deposition." Presented at the 3rd European Conf. on Appl. Supercond. (EUCAS'97), Veldhoven, The Netherlands, June 30-July 3, 1997. Institut fuer Festkoerper- und Werkstofforschung Dresden, Helmholtzstr. 20, D- 01069 Dresden, GERMANY; telephone +49 351 4659 206; telefax +49 351 4658 541; e-mail betz@ifw-dresden.de.

Howard A. Blackstead, John D. Dow, Ann K. Heilman, and David B. Pulling, "Prediction that Cm2-zThzSr2Cu2NbOx and Gd2-zCezSr2Cu2TiOx Will Superconduct." To be published in Solid State Commun. Department of Physics, University of Notre Dame, Notre Dame, IN 46556; telephone (219) 631-7078; telefax (219) 631-5952; e-mail blackstd@rems1.phys.nd.edu. Key words: superconductivity, Cm.

Baird Brandow, "Characteristic Features of the Exotic Superconductors." Preprint #LA-UR-97-1767; to be published in Phys. Reports. Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, NM 87545; telefax (505) 665-2659. Key words: superconductivity, exotic superconductors.

R. C. Budhani, J. O. Willis, M. Suenaga, M. P. Maley, J. Y. Coulter, H. Safar, J. L. Ullmann, and P. Haldar, "Studies of Flux Pinning by Proton- Induced Fission Tracks in Multifilamentary Tapes of (Bi,Pb)2Sr2Ca2Cu3O10/Ag Superconductor." To be published in J. Appl. Phys. Brookhaven National Laboratory, Upton, NY 11973.

V. Buntar, F. M. Sauerzopf, H. W. Weber, J. E. Fischer, H. Kuzmany, and M. Haluska, "Mixed State Parameters and Vortex Pinning in Single Crystalline K3C60 Fullerene Superconductors." To be published in Phys. Rev. B. Atominstitut der OEsterreichischen Universitaeten, Schuettelstrasse 115, A-1020 Wien, AUSTRIA; telephone +43 1 727 01 296; telefax +43 1 728 9220; e-mail buntar@ati.ac.at. 74.60.Ec; 74.60.Ge; 74.60.Jg; 74.70.Wz.

G. Cannelli, R. Cantelli, F. Cordero, F. Trequattrini, C. R. Grandini, and M. Ferretti, "Thermally Activated Dynamics of the Tilts of the CuO6 Octahedra and of Interstitial O in La2CuO4+d." To be published in Phys. Rev. B. Contact F. Cordero, CNR, Istituto di Acustica "O.M. Corbino", Via Cassia 1216, I-00189 Roma, ITALY; e-mail cordero@idac.rm.cnr.it.

Charles David Dewhurst, "Magnetization Measurements of High Temperature Superconducting Single Crystal Bi2Sr2CaCu2O8+d." Submitted as a Ph.D. thesis (University of Cambridge). Interdisciplinary Research Centre in Superconductivity, University of Cambridge, West Cambridge Site, Madingley Road, Cambridge CB3 0HE, UNITED KINGDOM; telephone +44 1223 337441; telefax +44 1223 337074; e-mail cdd1001@cus.cam.ac.uk; Web site http://www.sucon.cam.ac.uk/staff/charles_dewhurst/cdd-home.htm.

Jan R. Engelbrecht, Alexander Nazarenko, Mohit Randeria, and Elbio Dagotto, "Pseudogap Above Tc in a Model with d_[x^2-y^2] Pairing." Department of Physics, Boston College, Chestnut Hill, MA 02167; preprint also available at cond-mat@xxx.lanl.gov (#9705166). 74.25.-q; 74.20.-z; 74.20.Mn; 74.25.Dw.

Ayumi Fujita, "Langevin Simulation of Nonlocal Ginzburg-Landau Model for Superconductors in a Magnetic Field." Submitted to Phys. Rev. Lett. RIKEN, The Institute of Physical and Chemical Research, Wako, Saitama 351-01, JAPAN; telephone +81 48 467 9588; telefax +81 48 462 4648; e- mail afujita@mslpc2.riken.go.jp; preprint also available at cond- mat@xxx.lanl.gov (#9706205). 74.20.De; 74.60.Ge.

D. M. Gaitonde and T. V. Ramakrishnan, "Inertial Mass of a Vortex in Cuprate Superconductors." To be published in Phys. Rev. B. Mehta Research Institute, 10 Kasturba Gandhi Marg, Allahabad 211 002, INDIA; e-mail dattu@mri.ernet.in; preprint also available at cond- mat@xxx.lanl.gov (#9706139). 74.20.-z; 74.20.Fg; 74.20.De.

V. F. Gantmakher, L. P. Kozeeva, A. N. Lavrov, D. A. Pushin, D. V. Shovkun, and G. E. Tsydynzhapov, "Low-Temperature Resistivity of Single Crystals YBa2Cu3O6+x in the Normal State." Submitted to JETP Lett. Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, RUSSIA; e-mail gantm@issp.ac.ru; preprint also available at cond-mat@xxx.lanl.gov (#9705197). 71.30.+h; 72.20.-i; 74.72.Bk.

S. G. Gevorgyan, G. D. Movsesyan, A. A. Movsisyan, A. L. Gyulamiryan, V. A. Shindyan, and H. G. Shirinyan, "Implementation of High-Tc Superconductors for Creation of New Type Detectors of Particles and Radiation." To be published in J. Contemp. Phys. (Armenian Academy of Sciences). Laboratory of HTSC, Institute for Physical Research, National Academy of Sciences, IFI, Ashtarak-2, AM-378410, ARMENIA; e- mail gregor@lx2.yerphi.am or root@ipr.arminco.com.

S. Gevorgyan, A. Movsisyan, V. Shindyan, H. Shirinyan, and G. Movsesyan, "Implementation of HTSC for Creation of Particles and Radiation Detectors." To to presented at the Seventh Int. Workshop on Low Temp. Detectors (LTD-7), Munich, Germany, July 27-Aug. 2, 1997; to be published in NIM-A, 1997. Laboratory of HTSC, Institute for Physical Research, National Academy of Sciences, IFI, Ashtarak-2, AM-378410, ARMENIA; e-mail gregor@lx2.yerphi.am or root@ipr.arminco.com.

G. Hildebrand, T. J. Hagenaars, W. Hanke, S. Grabowski, and J. Schmalian, "Effects of Electronic Correlations on the Thermoelectric Power of the Cuprates." To be published in Phys. Rev. B. Institut fuer Theoretische Physik, Universitaet Wuerzburg, Am Hubland, D-97074 Wuerzburg, GERMANY; e-mail hildebrand@physik.uni-wuerzburg.de; preprint also available at cond-mat@xxx.lanl.gov (#9705035). 71.27.+a; 74.25.Fy; 74.20.-z; 74.72.-h.

M. Houssa, M. Ausloos, and R. Cloots, "Thermal Conductivity of YBa2(Cu1- xZnx)3O7-d: Relation Between x and d." To be published in Phys. Rev. B. SUPRAS, Institute of Physics B5, University of Liege, Sart-Tilman B- 4000 Liege, BELGIUM; telephone +32 41 66 3703; telefax +32 41 66 2990. 74.25.Fy; 74.72.Bk; 74.62.Dh.

G. Jackeli and V. Yu. Yushankhai, "Normal Fermi Liquid Behavior of Quasiholes in the Spin-Polaron Model for Copper Oxides." Preprint #E17- 97-43; submitted to Phys. Rev. B. Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, RUSSIA; telefax +7 095 975 23 81.

Chan-Joong Kim, Ki-Baik Kim, Il-Hyun Kuk, and Gye-Won Hong, "Role of PtO2 on the Refinement of Y2BaCuO5 Second Phase Particles in Melt- Textured Y-Ba-Cu-O Oxides." To be published in Physica C. 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 cjkim2@nanum.kaeri.re.kr.

S. Kim, Y. L. Yang, R. Christofferson, and A. J. Jacobson, "Oxygen Permeation, Electrical Conductivity and Stability of the Perovskite Oxide La0.2Sr0.8Cu0.4Co0.6O3-x." Preprint #97:068; submitted to Solid State Ionics. Contact A. J. Jacobson, Department of Chemistry, University of Houston, Houston, TX 77204-5641; preprint also available from Texas Center for Superconductivity, telephone (713) 743-8200; telefax (713) 743-8201; e-mail preprints@www.tcs.uh.edu. Key words: oxygen permeation, perovskite oxide, mixed conductivity, La0.2Sr0.8Cu0.4Co0.6O3-x.

J. R. Kirtley, K. A. Moler, J. M. Williams, and J. A. Schlueter, "Direct Measurement of the Interlayer Coupling Strength in a Layered Superconductor." IBM T.J. Watson Research Center, P.O. Box 218, Yorktown Heights, NY 10598.

A. E. Koshelev, "Point-Like and Line-Like Melting of the Vortex Lattice in the Universal Phase Diagram of Layered Superconductors." Contact Janice Coble, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439; telefax (708) 252-9595; e-mail janice_coble@qmgate.anl.gov.

J. Mannhart and H. Hilgenkamp, "Wave Function Symmetry and Its Influence on Superconducting Devices." Presented at the 3rd European Conf. on Appl. Supercond. (EUCAS'97), Veldhoven, The Netherlands, June 30-July 3, 1997. Experimentalphysik VI, Universitaet Augsburg, Universitaetsstr. 1, D-86135 Augsburg, GERMANY; telephone +49 821 598 3650; telefax +49 821 598 3652; e-mail jochen.mannhart@physik.uni-augsburg.de.

M. Matsukawa, K. Iwasaki, K. Noto, T. Sasaki, N. Kobayashi, K. Yoshida, K. Zikihara, and M. Ishihara, "Thermal Conductivity of the c-axis Aligned (Bi,Pb)2Sr2Ca2Cu3Oy in the Superconducting and Mixed States." To be published in Cryogenics. Department of Materials Science and Technology, Faculty of Engineering, Iwate University, 4-3-5 Ueda, Morioka 020, JAPAN; telephone +81 19 621 6358; telefax +81 19 621 6373; e-mail matsukawa@msv.cc.iwate-u.ac.jp. Key words: thermal conductivity, (Bi,Pb)2Sr2Ca2Cu3Oy, superconducting state, mixed state, quasiparticles.

A. Mehdaoui, J. Beille, D. Berling, B. Loegel, J. G. Noudem, and R. Tournier, "ac Irreversibility Line of Bismuth-Based High Temperature Superconductors." To be published in J. Mater. Res. (in press). Laboratoire de Physique et de Spectroscopie Electronique, URA 1435, Faculte des Sciences, Universite de Haute Alsace, 4 rue des Freres Lumiere, F-68093 Mulhouse Cedex, FRANCE.

G. I. Meijer, E. M. Kopnin, M. Willemin, J. Karpinski, H. Schwer, K. Conder, and C. Rossel, "Transition from Dimerization to Antiferromagnetic Order in Quasi-One-Dimensional Ca0.83CuO2." Preprint #6485; submitted to Phys. Rev. Lett. IBM Research Division, Zurich Research Laboratory, CH-8803 Rueschlikon, SWITZERLAND. 75.25.+z; 75.30.Gw; 75.40.Cx; 75.50.Ee.

M.-Carmen Miguel and Mehran Kardar, "Threading Dislocation Lines in Two- Sided Flux Array Decorations." Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139; e-mail carmen@cmt0.mit.edu; preprint also available at cond-mat@xxx.lanl.gov (#9706161). 74.60.Ge; 61.72.Lk; 74.72.Hs.

N. Morozov, E. Zeldov, M. Konczykowski, and R. A. Doyle, "Geometrical and Distributed Surface Barriers in Bi2Sr2CaCu2O8." Submitted to Physica C. Superconductivity Technology Center, Los Alamos National Laboratory, K763, Los Alamos, NM 87545; telephone (505) 667-3656; telefax (505) 665-3164; e-mail morozov@lanl.gov. Key words: vortex dynamics, surface barrier, geometry effect, magnetic susceptibility. 74.60.Ec; 74.60.Ge; 74.60.Jg.

M. Muralidhar, H. S. Chauhan, T. Saitoh, K. Kamada, K. Segawa, and M. Murakami, "Effect of Mixing Three Rare Earth Elements on the Superconducting Properties of REBa2Cu3Oy." To be published in Supercond. Sci. and Tech. Superconductivity Research Laboratory, International Superconductivity Technology Center (ISTEC), 3-35-2 Iioka- Shinden, Morioka, Iwate 020, JAPAN; telephone +81 19 635-9015 or -9016; telefax +81 19 635-9017; e-mail miryala@istec.or.jp. Key words: REBa2Cu3Oy, three rare-earth elements, melt process, critical temperature, critical current density.

J. G. Noudem, L. Porcar, O. Belmont, D. Bourgault, J. M. Barbut, J. Beille, P. Tixador, M. Barrault, and R. Tournier, "Study of the Superconducting Transition at High Pulsed Current of Bulk Bi:2223 Sintered and Textured by Hot Forging." To be published in Physica C. EPM-Matformag, CNRS, B.P. 166, 25 Avenue des Martyrs, F-38042 Grenoble Cedex 09, FRANCE; telephone +33 4 76 88 1000; telefax +33 4 76 88 1280.

N. P. Ong, K. Krishana, and T. Kimura, "Unusual Field Dependence of Thermal Conductivity in La2-xSrxCuO4: Suppression of Quasi-Particle Coherence." To be published in the Proc. of the 5th Int. Conf. on Mater. and Mech. of Supercond. -- High-Temp. Supercond. (M^2S-HTSC V), Beijing, People's Republic of China, Feb. 28-Mar. 4, 1997. Joseph Henry Laboratories of Physics, Princeton University, Princeton, NJ 08544.

Emmanuel Oniyama, Phillip G. Wahlbeck, Dean E. Peterson, J. Yates Coulter, and Eric J. Peterson, "Phase Diagram for 1/2Yb2O3-BaO-CuO." To be published in Physica C. Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, NM 87545, Phillip G. Wahlbeck's telephone in Wichita, KS (316) 978-3120; telefax (316) 978-3431; e-mail pgwahlbe@twsuvm.uc.twsu.edu. Key words: 1/2Yb2O3-BaO-CuO phase diagram, YbBa2Cu3O7-d, synthesis, Tc.

T. Plackowski, A. Jezowski, Z. Bukowski, C. Sulkowski, and H. Misiorek, "Thermal Conductivity of SmBa2Cu3O7-d Oxidized at 250 Bar: A Comparison of the 'Phonon' and 'Electron" Models.' Submitted to Phys. Rev. B. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 937, PL-50-950 Wroclaw 2, POLAND; telephone +48 71 3435021, ext. 278; telefax +48 71 441029; e-mail plackow@highscreen.int.pan.wroc.pl. 74.25.Fy; 74.72.Bk.

N. M. Plakida, "Optical Conductivity in the t-J Model." Preprint #E17- 97-14; submitted to Z. Phys. B. Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, RUSSIA; telefax +7 095 975 23 81.

W. Prellier, B. Mercey, Ph. Lecoeur, J. F. Hamet, and B. Raveau, "First Tailored Superlattices Containing Distinct Oxide and Oxycarbonate Blocks Grown by Pulsed Laser Deposition." To be published in Appl. Phys. Lett. Laboratoire CRISMAT-ISMRA et Universite de Caen, CNRS UMR 6508, Boulevard du Marechal Juin, F-14050 Caen Cedex, FRANCE; telephone +33 2 31 452607; telefax +33 2 31 951600; e-mail films@crcrisu.ismra.fr.

Jose Riera, Karen Hallberg, and Elbio Dagotto, "Phase Diagram of Electronic Models for Transition Metal Oxides in One Dimension." To be published in Phys. Rev. Lett. Instituto de Fisica Rosario y Depto. de Fisica, Univ. Nac. de Rosario, 2000 Rosario, ARGENTINA; Elbio Dagotto's telephone at Florida State University (904) 644-1726; telefax (904) 644- 5038. 71.10.-w; 75.10.-b; 75.30.Kz.

K. Salama, P. Putman, S. Athur, and S. Sathyamurthy, "Recent Developments in Melt Texturing of 123 Superconductors." Preprint #97:066; submitted to the Proc. of the Third Joint ISTEC/MRS Int. Workshop on Supercond., Big Island, Hawaii, June 15-18, 1997. Texas Center for Superconductivity, University of Houston, Houston, TX 77204- 4792; telephone (713) 743-4514; telefax (713) 743-4513; preprints also available at e-mail preprints@www.tcs.uh.edu.

K. Salama and S. Sathyamurthy, "Melt Texturing of YBCO for High Current Applications." Preprint #97:065; submitted to Appl. Supercond. Texas Center for Superconductivity, University of Houston, Houston, TX 77204- 4792; telephone (713) 743-4514; telefax (713) 743-4513; preprints also available at e-mail preprints@www.tcs.uh.edu.

K. Salama, S. Sathyamurthy, G. Du, and M. Mironova, "Processing and Characterization of YBCO Grain Boundaries Obtained by the Liquid Phase Removal Method." Preprint #97:067; submitted to Proc. of the Int. Workshop on the Proc. and Appl. of Supercond. (RE)BCO Large Grain Materials, Cambridge, United Kingdom, July 7-9, 1997. Texas Center for Superconductivity, University of Houston, Houston, TX 77204-4792; telephone (713) 743-4514; telefax (713) 743-4513; preprints also available at e-mail preprints@www.tcs.uh.edu.

S. Sarti, D. Neri, E. Silva, R. Fastampa, and M. Giura, "Fluctuational Dissipation in YBa2Cu3O7-d in Tilted Magnetic Fields." To be published in Phys. Rev. B. Dipartimento di Fisica, Universita "La Sapienza", Piazzale Aldo Moro 2, I-00185 Roma, ITALY; telefax +39 6 4463 158; e- mail sarti@roma1.infn.it. 74.25.Fy; 74.40.+k; 74.72.Bk.

P.V.P.S.S. Sastry, K. M. Amm, D. C. Knoll, S. C. Peterson, Ch. Wolters, and J. Schwartz, "Synthesis of (Hg,X)Ba2Ca2Cu3Ox Superconductors." To be published in J. Supercond. National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310. Key words: Hg superconductors, HgBa2Ca2Cu3Ox, magnetization data.

V. Selvamanickam, A. Ivanova, D. B. Fenner, T. Thurston, and M. S. Walker, "Fabrication of Biaxially-Textured Thick Film Y-Ba-Cu-O Superconductor by MOCVD on Cube-Textured Metal Substrates." To be published in the Proc. of the Symp. on High-Temp. Supercond. (Spring TMS Meeting), Orlando, Fla., Feb. 9-13, 1997. Intermagnetics General Corporation, Latham, NY 12110.

V. Selvamanickam, D. Kirchoff, C. E. Oberly, K. Salama, Y. Zhang, and S. Salib, "Growth Kinetics and Process Time Reduction in Melt Texturing of Y-Ba-Cu-O Superconductor." To be published in the Proc. of the Symp. on High-Temp. Supercond. (Spring TMS Meeting), Orlando, Fla., Feb. 9-13, 1997. Intermagnetics General Corporation, Latham, NY 12110.

Donglu Shi, K. Lahiri, D. Qu, S. Sagar, V. F. Solovjov, and V. M. Pan, "Surface Nucleation, Domain Growth Mechanisms, and Factors Dominating Superconducting Properties in Seeded Melt Grown YBa2Cu3Ox." Submitted to J. Mater. Res. Department of Materials Science and Engineering, University of Cincinnati, Cincinnati, OH 45221-0012.

Donglu Shi, D. Qu, and Brian Tent, "Growth Anisotropy in Seeded Melt Growth of YBa2Cu3Ox." Presented at the Int. Workshop on the Proc. and Appl. of Supercond. (RE)BCO Large Grain Materials, Cambridge, United Kingdom, July 7-9, 1997. Department of Materials Science and Engineering, University of Cincinnati, Cincinnati, OH 45221-0012.

E. B. Sonin and I. Felner, "High-Tc Superconducting Weak Ferromagnets." Racah Institute of Physics, Hebrew University of Jerusalem, Jerusalem 91904, ISRAEL. 74.25.Ha; 74.20.De.

A. Suter, M. Mali, J. Roos, D. Brinkmann, J. Karpinski, and E. Kaldis, "Electronic Crossover in the Normal State of YBa2Cu4O8." To be published in Phys. Rev. B (in press). Physik-Institut, Universitaet Zurich, CH-8057 Zurich, SWITZERLAND. 74.25.Jb; 74.25.Nf; 74.40.+k; 74.72.Bk.

Bennie ten Haken, Andre Beuink, and Herman H.J. ten Kate, "Small and Repetitive Axial Strain Reducing the Critical Current in BSCCO/Ag Superconductors." Presented at the Appl. Supercond. Conf. (ASC'96), Pittsburgh, Pa., Aug. 25-30, 1996. Low Temperatures Division, University of Twente, PO Box 217, 7500 AE Enschede, THE NETHERLANDS.

Zlatko Tesanovic and Pedro D. Sacramento, "Landau Levels and Quasiparticle Spectrum of Extreme Type-II Superconductors." Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218.

W. G. Wang, J. Horvat, J. N. Li, H. K. Liu, and S. X. Dou, "Effect of (Pb,Bi)3Sr2Ca2CuOy Phase on Critical Current Density of Ag/(Bi,Pb)2Sr2Ca2Cu3O10 Tapes." To be published in Physica C. Center for Superconducting and Electronic Materials, University of Wollongong, Northfields Avenue, Wollongong NSW 2522, AUSTRALIA; telephone +61 42 21 5766; telefax +61 42 21 5731; e-mail wgw01@uow.edu.au.

W. G. Wang, J. Horvat, B. Zeimetz, H. K. Liu, and S. X. Dou, "Effect of (Bi,Pb)2Sr2CuO6 Phase on Critical Current Density of Ag/(Bi,Pb)2Sr2Ca2Cu3O10 Tapes." To be published in Physica C. Center for Superconducting and Electronic Materials, University of Wollongong, Northfields Avenue, Wollongong NSW 2522, AUSTRALIA; telephone +61 42 21 5766; telefax +61 42 21 5731; e-mail wgw01@uow.edu.au.

Rinke J. Wijngaarden, K. Heeck, H.J.W. Spoelder, R. Surdeanu, and R. Griessen, "Fast Determination of 2D Current Patterns in Flat Conductors from Measurement of Their Magnetic Field." Submitted to Phys. Rev. B. Department of Physics and Astronomy, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, THE NETHERLANDS; telephone +31 20 444 7918; telefax +31 20 444 7899; e-mail rw@nat.vu.nl. Key words: superconductivity, magnetooptics, biomagnetic inversion.

M. Willemin, C. Rossel, J. Hofer, H. Keller, Z. F. Ren, and J. H. Wang, "Pairing Symmetry from In-Plane Torque Anisotropy in TI2201 Thin Films." Submitted to Phys. Rev. B. Contact C. Rossel, IBM Research Division, Zurich Research Laboratory, CH-8803 Rueschlikon, SWITZERLAND; e-mail rsl@zurich.ibm.com. 74.25.-q; 74.25.Ha; 74.72.Fq; 74.76.-w.

Hui Wu, P. Matl, N. P. Ong, R. Gagnon and L. Taillefer, "Collapse of the Vortex Lattice Inductance in Untwinned YBa2Cu3O7 Observed by Complex Resistivity Technique." Presented at the 5th Int. Conf. on Mater. and Mech. of Supercond. -- High-Temp. Supercond. (M^2S-HTSC V), Beijing, People's Republic of China, Feb. 28-Mar. 4, 1997. Bell Innovation Laboratories, Murray Hill, NJ 07974.

Masashi Yamashiro, Yukio Tanaka, and S. Kashiwaya, "Theory of Tunneling Spectroscopy in Superconducting Sr2RuO4." To be published in Phys. Rev. B. Graduate School of Science and Technology, Niigata University, Ikarashi, Niigata 950-21, JAPAN; telephone +81 25-262 7370 or -261 8933; e-mail masashi@bussei.sc.niigata-u.ac.jp or myama@gs.niigata-u.ac.jp. 74.50.+r; 74.25.Fy; 74.72.-h.

COMING EVENTS (An * indicates a previously listed event.)

*Aug. 25 - 28, 1997: International Conference on Computational Physics (PC '97), Santa Cruz, Calif. Meeting will be the first full conference sponsored by the American Physical Society's Division of Computational Physics and the Forum on Industrial and Applied Physics, and will be held jointly with the European Physical Society and the International Union of Pure and Applied Physics. Intends to facilitate interactions between developers and users of computational methods, and strongly emphasize applications of computational physics to industrial and other practical problems. Six tutorial sessions will cover applications and methods of computational physics in topic areas including fluid dynamics, optimization methods, object-oriented methods, and industrial physics, among others. For information, contact Ann Lavallee, Conference Secretary, Department of Physics, University of California at Davis, Davis, CA 95616-8677; telephone (916) 752-4088; telefax (916) 752-4717; e-mail comp97@physics.ucdavis.edu; Web site http://aps.org/meet/PC97/.

**Sept. 14 - 18, 1997: Conference on Spectroscopies in Novel Superconductors (SNS '97), Sea Crest Oceanfront Resort and Conference Center, Falmouth, Cape Cod, Mass. Conference sponsored by the College of Arts and Sciences as part of centennial celebration of the founding of Northeastern University. For further information, contact Phyllis Mitzman, Conference Coordinator, The Barnett Institute, Mugar 341, Northeastern University, Boston, MA 02115; telefax (617) 373-8277; e- mail sns97@neu.edu; Web site http://www.conf.neu.edu/sns97. ** Note corrected e-mail address.

*Oct. 13 - 25, 1997: Second Training Course in the Physics of Correlated Electron Systems and High-Tc Superconductors Vietri sul Mare, Salerno, Italy. Aimed at postdoc-level researchers, courses intend to promote theoretical research in the field of highly corre-lated electron systems by putting together senior researchers and young researchers. Topics will include impurity effects in highly correlated electron systems, mesoscopic devices, 1D systems, vortex state in d-wave superconductivity, colossal magnetoresistance, numerical techniques (Monte Carlo and Lanczos methods). The courses will be open to twenty young (aged under 35) European researchers. Application deadline, August 30, 1997. Registration fee: $250. A limited number of grants will be available. Requests for application forms and further information should be sent to F. Mancini, Dipartimento di Scienze Fisiche "E.R. Caianiello", Universita' di Salerno, Via S. Allende, I- 84081 Baronissi (SA), Italy; telephone +39 89-965 322; telefax +39 89- 965 275; e-mail: mancini@ vaxsa.csied.unisa.it.

Oct. 30 - Nov. 1, 1997: Fourth International Symposium on Magnetic Suspension Technology (MST), The Nagaragawa Convention Center, Gifu, Japan. Purpose is to review recent developments in sensors, controls, superconducting magnet technology, and design/implementation practices. Topics include: pointing and control systems, vibration isolation systems, momentum storage or combined energy storage/control devices, wind tunnel model suspension systems, magnetic bearings, magnetically levitated trains (Maglev), hypersonic Maglev, and electromagnetic launch systems. The second category includes technology of superconducting magnets (low and high Tc), sensors, control systems, power supplies, design and analysis methods. Pre-registration deadline, September 26, 1997. For further information, contact Nelson J. Groom, NASA Langley Research Center, Hampton, VA 23681-0001, telephone (804) 864-6613, telefax (804) 864-7797, e-mail n.j.groom@arc.nasa.gov; Jack E. Crow, National High Field Magnet Laboratory, 1800 E. Paul Dirac Drive, Tallahassee, FL 32306-4005, telephone (904) 644-0311, telefax (904) 644- 0867, e-mail crow@magnet.fsu.edu; or Hideo Sawada, National Aerospace Laboratory, Tokyo, Japan; telephone +81 422 47 5911, telefax +81 422 49 0793, e-mail sawada@nal.go.jp.

March 24 - 29, 1998: The International Workshop on High Temperature Superconductors and Novel Inorganic Materials Engineering (MSU-HTSC V), Moscow, Russia. Workshop will be the fifth in the series organized by Moscow State University since 1989. Main topics: chemistry and technology of superconducting materials and novel inorganic materials engineering. Abstract deadline, December 15, 1997. For further information, contact A. I. D'yachenko, MSU-HTSC V Secretariat, Department of Chemistry, Moscow State University, Moscow 119899, Russia; telephone +7 095 939-34-90; telefax +7 095 939-47-88; e-mail dyachenko@inorg.chem.msu.su.

May 3 - 8, 1998: Fullerenes: Chemistry, Physics and New Directions XI, 193rd Meeting of the Electrochemical Society, Sheraton San Diego Hotel & Marina, San Diego, Calif. Papers are invited for Symposium N16 -- Fullerene-Based Superconductors. Selected papers in the program may be assigned to a poster session. Publication of a proceedings volume is planned. Specific details about the format for contributed papers for the proceedings can be obtained from the session organizers. Abstract deadline, January 2, 1998. Contact V. Buntar, Atominstitut der Oesterreichischen, Universitaeten, Schuettelstr. 115, A-1020, Vienna, Austria; telephone +43 1-727-01296; telefax +43 1-728-9220; e-mail buntar@ati.ac.at or M. Nunez-Regueiro, Centre de Recherches sur les Tres Basses Temperatures, Centre National de la Recherche Scientifique, BP 166 Cedex 09, F-38042 Grenoble, France; telephone +33 7-688-7838; telefax +33-7-687-5060; e-mail nunez@labs.polycnrs-gre.fr. For general conference information, contact the Electrochemical Society, Inc., 10 South Main Street, Pennington, NJ 08534-2896; telephone (609) 737-1902; telefax (609) 737-2743; e-mail ecs@electrochem.org.

*June 14 - 19, 1998: Ninth International Conference on Modern Materials & Technologies (CIMTEC '98): Topical Symposium VI -- Science and Engineering of HTC Superconductivity, Florence International Congress Centre, Florence, Italy. Will highlight recent research advances in high-Tc oxide, organic, and other exotic superconductors. Fundamental aspects and theory, advances in materials synthesis, processing and properties will be featured as well as current developments in superconducting components and devices. Session topics are broadly classified into the following groups: materials, synthesis, processing, structure, and physical chemistry; physical properties; phenomenology of the superconducting state; theory of HTC superconductivity; and applications. Oral and poster presentations. Abstract deadline, September 30, 1997. Proceedings to be published. Official language is English. Contact 9th CMTEC, Forum on New Materials, Topical Symposium VI, P.O. Box 165, I-48018 Faenza, Italy; telephone +39 546-22661 or -664143; telefax +39 546-664138 or -663362.

RESOURCES

Information

New Book: New Superconductors -- From Granular to High Tc, by Guy Deutscher. Contents: different kinds of superconductors, granular and percolating superconductors, strong to weak screening, the role of reduced dimensionality, fluctuation effects, interplay between charging energy and Josephson coupling, the BCS gap equation in the weak screening regime, Andreev reflections, interference experiments on the gap symmetry, the vortex state, and others. To be publ. fall 1997; 300 pp.; price $48; ISBN 981-02-3089-3. Contact World Scientific Publishing Co. Inc., 1060 Main St., River Edge, NJ 07661; telephone (800) 227-7562 or (201) 487-9655; telefax (201) 487-9656. In Europe, World Scientific Publishing Co. Ltd., 57 Shelton Street, Covent Garden, London WC2 9HE, UK; telephone +44 171 836 0888; telefax +44 171 836 2020. In Asia, World Scientific Publishing Co. Pte. Ltd., Farrer Road, P.O. Box 128, Singapore 9128; telephone +65 3825663; telefax +65 3825919. Information also available at the Web site http://www.wspc.com.sg/.

New MRS Proceedings: Interfacial Engineering for Improved Materials Performance, Volume 458 in the MRS Symposium Proceedings Series, edited by Clyde L. Briant, C. Barry Carter, and Ernest L. Hall. Documents symposium reports from the 1996 MRS Fall Meeting. This volume goes a step beyond structural and chemical studies, to explore how all of this information can be used to engineer interfaces for improved properties and overall improved material performance. Significant attention is given to the crystallographic nature of grain boundaries and interfaces, and the relationship between this nature and the performance of a material. The versatility of electron back-scattering pattern analysis (EBSP) in solving a number of interface-related problems is also featured. Topics include: introductory concepts and modeling; characterization, orientation, and interfacial films; characterization, microscopy, and chemistry; mechanical properties; general interfaces; composites, laminates, and coatings; and thin films. Publ. 1997; 74 papers, 510 pages; price $65.00 (MRS members), $75.00 (U.S. list), and $86.00 (non-U.S. list); ISBN 1-55899-362-2. For further information or to place an order, contact the Materials Research Society, Customer Services Department, 9800 McKnight Road, Pittsburgh, PA 15237-6006; telephone (412) 367-3012; telefax (412) 367-4373.

Products and Services

Used equipment for science and industry available from Capovani Brothers, Inc. Includes: baths and chillers, furnaces, ccd cameras and monitors, cryogenic and other vacuum equipment, data acquisition and control, electronic test equipment, ion pumps and controls, lasers and related equipment, leak detectors, microscopes, plasma etchers, polishing and specimen-preparation equipment, power supplies, rf generators/amplifiers, scanning electron microscopes and EDXRF equipment, tensile and compression equipment, thermal analysis, thin- film inspection equipment, turbo pumps and controllers, and many other miscellaneous equipment. Contact Capovani Brothers, Inc., 704 Corporations Park, Scotia, NY 12302-1047; telephone (518) 346-8347; telefax (518) 381-9578; e-mail cbi@capovani.com; Web site http://www.capovani.com.

High Pressure Research: Rockland Research Corp., an international manufacturer of hydraulic presses, piston cylinders, and multi-anvil systems for high-pressure experimentation up to 250 kbar and 2500^oC, offers items of interest to experimentalists studying HTS materials at high pressures. Newest product is a unique cubic anvil apparatus for the processing of large samples up to 60 kbar. Rockland provides "turn key" as well as custom-designed high-pressure equipment to academic, government, and industrial laboratories around the world for research in geology, chemistry, physics, and materials sciences. For information, contact Peter McNutt, Rockland Research Corporation, 16 Tompkins Avenue, West Nyack NY 10994; telephone (914) 353-4686; telefax (914) 358-9119; e-mail petermc@rocklandresearch.com; Web site http://www.rocklandresearch.com/.

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Supporting ($200-$499) M. R. Tubbs F. de la Cruz Detlef Brinkmann U. Wisconsin Appl. Supercond. Research Center (David Larbalestier) Intermagnetics General Corp. (Carl H. Rosner) Centre for Supercond. and Electronics Mater., U. of Wollongong (S. X. Dou) Asea Brown Boveri AG (Makan Chen) National Institute of Standards & Technology (A. F. Clark) Rockland Research Corp. (Peter D. McNutt)

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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.

The information contained herein is intended for limited distribution. Readers are expected to respect the rights of the authors.

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: MITRA@AMESLAB.GOV or MITRA@IASTATE.EDU.

Project Director/Editor: Sreeparna Mitra Science Editor: John R. Clem High-Tc Update, Vol. 11, #15, August 1, 1997.