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.
YBaCu3O7-d
Polarized and unpolarized neutron scattering has been used by H. F. Fong (Princeton) et al. to determine the effect of superconductivity on the magnetic excitation spectra of YBa2Cu3O6.5 and YBa2Cu3O6.7. Enhancements of the spectral weight centered around 25 meV and 33 meV are observed in this data and provide clues about the origin of the 40 meV magnetic resonance peak in YBa2Cu3O7.
Engineered [001] tilt series single grain-boundary specimens of bulk melt-processed YBCO, with tailored misorientation ranging from 1.5 degrees to 45 degrees, have been electrically characterized in a preprint by M. St. Louis-Weber (Northwestern) et al. The authors contrast their findings with thin film grain boundary transport behavior.
Bi Cuprates
The microstructures of single filaments of Ag-sheathed (Bi,Pb)2Sr2Ca2Cu3O10+d multifilament tapes have been investigated by Th. Schuster (Max-Planck) et al. by polarized light and scanning electron microscopy. The authors find large differences in the microstructure of filaments depending on their position in the cross section of the tape, and a factor of ten reduction in the critical current density in the outer compared to center filaments.
The alloys Ag-Mg, Ag-Pd-Mg, and Ag-Au-Mg were investigated by J. Yoo et al. (Korea Institute) as alternative sheath materials to pure Ag for powder-in-tube (PIT) processing of Bi tapes. The authors find that addition of Au and Pd to Ag increased the resisitivity but not the hardness. However, addition of Mg to Ag-Au and Ag-Pd increased the hardness significantly. Use of Ag-Au-Mg alloys improved uniformity of BSCCO core thickness and mechanical strength without deterioration of superconductivity, and microstructural studies revealed a more dense and aligned structure particularly along the sheath-core interface.
Transport and magnetization measurements in Ag-sheathed Bi-2223 tapes have been investigated by T. Staiger et al. (Dresden). The authors explain the superconducting current through a tape by assuming a network of platelike grains coupled by weak links.
A preprint by M. Lelovic (Pittsburgh) et al. reports a pronounced effect of cooling rate on the transport current of Bi-2223 tapes. Results indicate that during fast cooling, a thin layer of BSCCO adjacent to the Ag sheath is under compressive stress that causes microcracking and affects the alignment and interconnectivity of the 2223 grains. In comparison, slower cooled tapes reached 2 to 3 times higher I_c values.
Two preprints by Th. Lang et al. (ETH-Zurich) report studies on meltprocessed bulk and thick films of Bi-2212. In one paper, the authors investigate the decomposition and reformation of thick films on silver substrates and find the grain size of the solid peritectic phases floating in the liquid matrix to be dependent on time and temperature. In the second, the formation of a textured microstructure on Bi-2212 thick films and bulk samples are studied by quenching such specimens from various temperatures during partial melt processing.
Other Cuprates
Using a high-resolution SEM technique, O. G. Singh et al. (IIT, Mumbai) report direct evidence for the local oxygen non-stoichiometry in Nd2xCexCuO4+d and find that oxygen content increases from the grain boundary towards the interior of a superconducting grain. The authors conclude that critical levels of carriers and oxygen vacancies are essential for the cuprates to exhibit superconductivity.
A preprint by T. Kodenkandath (CNR, Parma) et al. finds that Ba2CuO2Cl2 with K2NiF4 structure can be stabilized under normal pressure with 2025% of Ca or Cd substituted for Cu. The stabilization mechanism is explained in terms of the crystallographic tolerance factor criteria and structural requirements needed for the formation of layered structures involving Ba and Cu.
Synthesis, crystal structure, and superconductivity of a new copper oxyfluoride series, Sr2RCu2O5F (R=Y,La,Nd,Sm,Gd,Dy,Er, and Yb) are studied in a paper by M. Isobe et al. (NIRIM). Superconductivity is reported in the Nd analog (with partial Ca substitution) with the highest Tc value of 85 K.
Vortices
The scaling behaviors of several YBa2Cu3O7-d thin films with controlled deoxygenation of the samples has been investigated by K. Moloni et al. (Purdue). The authors find that a field H_b identifies a crossover below which 3D XY scaling is successful and above which lower-Landaulevel scaling prevails.
Decoration studies resolving individual flux lines of Bi2Sr2CaCu2O8+d above 55 K are reported in two papers by P. Kim et al. (Harvard). Comparison of the vortex-resolved flux-line-lattice structures obtained at 55 K and 4.2 K shows that the fraction of twisted bond defects is greater at high temperatures than low temperatures, while the density of dislocations is roughly independent of temperature.
Two papers by C. D. Keener at al. (Ohio State) investigate nonlocal conductivity in Bi2Sr2CaCu2O8+d crystals. Using an eight-terminal geometry, the authors measured voltages in single crystals with currents both parallel and perpendicular to the c axis with H <= 3 kOe (H||c) and find results to disagree with models that assume classical
electrodynamics. The authors indicate that interlayer vortex coupling is responsible for nonlocal conductivity. In a second preprint, the authors find that hysteresis accompanies vortex lattice melting in Bi2212 single crystals. Measurements show nonlocal conductivity in the vortex liquid phase which correlated with the strength of the interlayer vortex coupling.
mu-SR measurements were carried out by C. M. Aegerter (St. Andrews) et al. on Bi2.15Sr1.85CaCu2O8+d crystals for a range of oxygen stoichiometries, and the low-temperature in-plane penetration depth lambda_[ab] determined as a function of oxygen content. The authors find that the crossover field, B_[cr], depends only on the penetration depth as B_[cr]= phi/lambda_[ab]^2, rather than on the anisotropy parameter gamma.
The influence of different types of disorder on the superfluid properties of a weakly interacting or dilute Bose gas and corresponding quantities for flux line liquids in high-temperature superconductors at low magnetic fields are reviewed, investigated, and compared in a preprint by U. C. Taeuber (Oxford) et al. Experimental implications for vortex lines are described briefly.
The nature of pinning in three-dimensional (K,Ba)BiO3 single crystals has been investigated by W. Hornet et al (CNRS, Grenoble). The authors show that the magnetic field dependence of the critical current deduced from pulsed-field magnetization measurements can be well described by the collective pinning theory over a large temperature range 0.06 < T/Tc <0.62. The authors find the temperature dependence of the collective pinning length L_c to be in good agreement with the delta-Tc pinning model.
Theory
It is shown, in a preprint by R. P. Gupta and M. Gupta (Saclay), that the oxygen displacement from the CuO2 planes in YBa2Cu3O7 results in a significant depletion of the hole density and local disruption of the electronic integrity around the Cu(2) sites. The authors warn that these additional mechanisms need to be considered along with the usual pair-breaking theory for proper understanding of the degradation of Tc under electron irradiation.
A preprint by A. S. Blaer (Columbia) et al. presents a study of the bound states and resonances formed by two lattice fermions interacting via a nonretarded potential that is attractive for nearest neighbors and repulsive for other relative positions. The authors argue that the dwave symmetry is related to a special form of the fermionic kinetic energy and does not require any novel pairing mechanism. The results are discussed in connection with the properties of high-Tc cuprate superconductors.
The interlayer pair tunneling model of Anderson et al. is generalized by Mitrovic et al. (Brock U.) to include the strong coupling effects associated with in-plane interactions. The authors numerically solve the equations for the superconducting transition temperature Tc for several models of electron-phonon coupling and calculate the isotope effect associated with the in-plane oxygen optic mode and its dependence on the strength of the interlayer pair tunneling.
A preprint by R. B. Laughlin (Stanford) argues that the gap recently observed at the Brillouin zone face of cuprate superconductors in photoemission by Marshall et al. [Phys. Rev. Lett. 76, 4841 (1996)] and Ding et al. [Nature 382, 54 (1996)] is evidence for the decay of the injected hole into a spinon-holon pair.
Two preprints by K. Maki (U. Southern California) and H. Won (Hallym U.) study the vortex state in d-wave superconductivity. The papers describe properties of the vortex state in magnetic fields with both B||c and B||ab plane. For B||c, the authors find the square lattice tilted by pi/4 from the a axis to be most stable and for the B||ab plane, they find the upper critical field to exhibit a fourfold symmetry within the ab-plane.
In another paper Y. Sun and K. Maki (U. Southern California) calculate and compare the residual density of states, spin susceptibility, and superfluid density of d-wave superconductors with nonmagnetic impurities and s-wave superconductors with magnetic impurities.
The dispersion of a hole in CuO2 bilayers and 3D antiferromagnets is calculated by A. Nazarenko and E. Dagotto (Florida State) using the self-consistent Born approximation. The authors find that a small coupling in the z direction does not qualitatively alter the d_[x^2-y^2] superconducting state found for a pure single-layer plane. In bilayers, as the exchange along the direction perpendicular to the planes grows, a transition to the s-wave state is observed.
Thin Films
Stationary and dynamic properties of a large number of YBCO-Au-YBCO junctions have been investigated by M. Bode et al. (ISI, Juelich). The junction characteristics observed were large resistances, excess current of the order of the critical current, linear temperature dependence of the critical current, and deviations from the dynamic behavior of the resistively shunted junction (RSJ) model. The authors use the timedependent Ginsburg-Landau equations to model the measure I-V characteristics with and without microwave irradiation and account for the observed dynamic characteristics.
Atomic force microscopy studies were performed by Y. Yoshida et al. (ISTEC) on epitaxial YBa2Cu3O7-d thin films grown by MOCVD on MgO [100] substrates. An abrupt change in the surface morphology and terrace width of growth is observed at about 750^oC. The authors conclude that this transition temperature corresponds to growth-mode change from conventional vapor growth to vapor-liquid-solid growth.
Ramp type YBa2Cu3O7-d/PrBa2Cu3O7-d/YBa2Cu3O7-d Josephson junctions have been fabricated by M. D. Strikovskiy et al (KFA, Juelich) by using a new microshadow mask technique for completely in-situ growth of the multilayer structure. Junctions with barrier thickness of 45 nm exhibited supercurrent up to 80 K, showed resistively shunted junctionlike current voltage characteristics with V_c~1.5 mV, and exhibited the ac Josephson effect at 77 K under 8.9 GHz radiation.
A preprint by Michael S. Pambianchi et al. (Maryland) shows that surface impedance data on c-axis Yba2Cu3O7-d/Y0.6Pr0.4Ba2Cu3O7 bilayers is consistent with either proximity coupling in the c direction between the two materials with a very weak proximity-induced condensate, or the behavior of two isolated superconductors in a bilayer geometry. An increase in surface resistance above Tc of the Pr-doped layer indicates that the conductivity of the Y0.6Pr0.4Ba2Cu3O7 layer is strongly enhanced above Tc, in agreement with THz spectroscopy measurements.
High-pressure dc sputtering has been used by P. Przyslupski et al. (Polish Academy) to fabricate (YBa2Cu3O7/Nd0.67Sr0.33MnO3-y)n superlattices. Magnetic moments measured for the superlattices below superconducting transition indicate the coexistence of superconductivity and ferromagnetism in the total volume of the heterostructures, where superconductivity is related to the YBCO sublayer and ferromagnetism to the NSMO sublayer.
Biaxially aligned YSZ buffer layers for YBa2Cu3O7-d tapes were grown on both amorphous and polycrystalline substrates by V. Betz et al. (Dresden) by the ion-beam-assisted laser-deposition process (IBALD). Film growth with and without ion bombardment was monitored in situ with a RHEED system, and the in-plane alignment was quantitatively determined.
Epitaxial superconducting films of HgBa2Ca2Cu3O8+d (Hg-1223) were prepared by the sol-gel method on [100] Y0.15Zr0.85O1.93 substrates by Yzhak Tsabba et al. (Weizmann Institute). The films exhibit a critical current density of ~~10^7 A/cm^2 (10 K) and a Tc of 135 K. The authors measured the anisotropy of the irreversibility line and critical current with respect to the relative orientation of the film to the applied magnetic field and found a huge mass anisotropy (Gamma = 32000], which they suggest is due to the three adjacent CuO2 layers present in Hg-1223 compared to the two in Hg-1212.
Applications
Bulk bars of (Bi,Pb)-Sr-Ca-Cu-O (Bi-2223) were fabricated by M. P. Chudzik et al. (Argonne) for current-lead applications. The bars were densified by subjecting them to alternate liquid-phase sintering and cold isostatic pressing, and silver contacts were applied by hot pressing at 820^oC and 3 MPa. The authors report current densities of ~~1000 A/cm^2 (critical currents of 750 A at 77 K).
A paper by B. L. Fisher et al. (Argonne) reports the design and fabrication of prototype downlinks with sinter forged bars of (Bi,Pb)2223 to deliver a continuous ac current of 1500 A over a 77 K to 4.2 K temperature gradient. The authors discuss design considerations and modeling of the downlinks, which supply high ac currents over the temperature gradient with low thermal losses.
A preprint by V. Polushkin et al. (Oxford Instruments) reports the development of a miniature SQUID magnetometer with readout electronics. The magnetometer can be used for high-Tc film characterization and to the study of dynamic magnetization properties of micron- and submicronsized particles for high-resolution surface magnetometry.
Overviews
The experimentally observed normal-state thermodynamic and transport properties of cuprate superconductors are reviewed in a paper by E. Abrahams (Rutgers). Some transport properties of this state are described using the marginal Fermi liquid hypothesis (37 refs.).
A paper by V. M. Yakovenko et al. (U. Maryland) reviews recent developments in the theory of the quantum Hall effect in the magneticfield induced spin-density-wave state of the quasi-one-dimensional organic conductor (TMTSF)2X (40 refs.).
Contributed by Sreeparna Mitra
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.
Elihu Abrahams, "Normal State Properties of High-Temperature Superconductors and the Marginal Fermi Liquid." Manuscript #6.1119; to be published in Schegolev Memorial Vol. of J. de Physique I. Serin Physics Laboratory, Rutgers University, P. O. Box 849, Piscataway, NJ 08855-0849; telephone (908) 445-2520; telefax (970) 920-2611; e-mail abrahams@physics.rutgers.edu. 75.25.+z; 74.72.-h; 71.27.+a.
C. M. Aegerter, S. L. Lee, H. Keller, E. M. Forgan, and S. H. Lloyd, "Dimensional Crossover in the Magnetic Phase Diagram of Bi2.15Sr1.85Ca1Cu2O8+d Crystals with Different Oxygen Stoichiometry." Submitted to Phys. Rev. B. Physik-Institut der Universitaet Zurich, CH8057 Zurich, SWITZERLAND; e-mail aegerter@physik-rzu.unizh.ch. 74.25.Dw; 74.72.Hs; 76.75.+i; 74.62.Dh.
W. A. Atkinson and J. P. Carbotte, "Interband Effects in the caxis Optical Conductivity in YBa2Cu3O7-d." Submitted to Phys. Rev. B. Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, CANADA L8S 4M1; e-mail atkinson@physics.mcmaster.ca; preprint also available at cond-mat@xxx.lanl.gov (#9608137). 74.25.Nf; 74.25.Jb; 74.72.-h.
U. Balachandran, A. N. Iyer, R. Jammy, M. Chudzik, M. Lelovic, P. Krishnaraj, N. G. Eror, and P. Haldar, "Processing and Characterization of Ag-Clad Bi-2223 Superconductors." Presented at the Appl. Supercond. Conf. (ASC'96), Pittsburgh, PA, Aug. 25-30, 1996. Contact Janice Coble, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439; telefax (708) 252-9595; e-mail janice_coble@qmgate.anl.gov.
Jorge Berger and Jacob Rubinstein, "Bifurcation Analysis for Phase Transitions in Superconducting Rings with Nonuniform Thickness." Department of Physics, Technion - Israel Institute of Technology, 32000 Haifa, ISRAEL; e-mail phr76jb@vmsa.technion.ac.il; preprint also available at supr-con@xxx.lanl.gov (#9608001).
Volker Betz, Bernhard Holzapfel, and Ludwig Schultz, "Biaxially Aligned YSZ Buffer Layers for YBCO Tapes on Technical Substrates with Ion-Beam Assisted Pulsed Laser Deposition and in situ RHEED Texture Analysis." Presented at the Proc. of the XXI Int. Conf. on Low Temperature Phys. (LT21), Prague, Czech Republic, Aug. 8-14, 1996; to be published in Czech J. Phys. Institute of Metallic Materials, Institut fuer Festkoerper- und Werkstofforschung Dresden, Helmholtzstr. 20, D01069 Dresden, GERMANY; telephone +49 351 4659 478; telefax +49 351 4658 541; e-mail betz@ifw-dresden.de.
Howard A. Blackstead and John D. Dow, "Absence of Magnetic PairBreaking by Ni in Most High-Temperature Superconductors." 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. 74.20.Fg.
A. S. Blaer, H. C. Ren, and O. Tchernyshyov, "Extended Bound States and Resonances of Two Fermions on a Periodic Lattice." Preprint #CU-TP-711. Department of Physics, Columbia University, New York, NY 10027. O. Tchernyshyov's telephone (212) 854-3960; telefax (212) 9323169; e-mail olegt@cuphyb.phys.columbia.edu; preprint also available at supr-con@xxx.lanl.gov (#9608003). 71.10.Fd; 74.20.-z; 03.65.Ge.
M. Bode, M. Grove, M. Siegel, and A. I. Braginski, "Superconductor-Normal-Superconductor Step Edge Junctions with Au Barriers." Submitted to J. Appl. Phys. Institut fuer Schicht- und Ionentechnik, Forschungszentrum Juelich GmbH., D-52425 Juelich, GERMANY. 74.50.+r.
P. Bordet, F. Duc, S. LeFloch, J. J. Capponi, E. Alexandre, M. Rosa-Nunes, S. Putilin, and E. V. Antipov, "Single Crystal Xray Diffraction Study of the HgBa2CuO4+d Superconducting Compound." Submitted to Physica C. Laboratoire de Cristallographie Centre National De La Recherche Scientifique, BP 166, F-38042 Grenoble Cedex 9, FRANCE; telephone +33 7688 1142; telefax +33 76 88 1038. Key words: single crystal, x-ray diffraction, structure of Hg-1201.
Matthias Brinkmann, Thomas Rex, Markus Stief, Heinrich Bach, and Kurt Westerholt, "Residual Resistivity and Oxygen Stoichiometry in Pr2-xCexCuCO4+d Single Crystals." To be published in Physica C (in press). Institut fuer Experimentalphysik/Festkoerperphysik, RuhrUniversitaet Bochum, D-44780 Bochum, GERMANY. Key words: electrondoped superconductors, lattice defects, pair-breaking scattering, transport.
M. P. Chudzik, B. J. Polzin, R. Thayer, J. J. Picciolo, B. L. Fisher, and M. T. Lanagan, "Fabrication and Characterization of (Bi,Pb)-Sr-Ca-Cu-O (2223) Bars." Presented at the Appl. Supercond. Conf. (ASC'96), Pittsburgh, PA, Aug. 25-30, 1996. Contact Janice Coble, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439; telefax (708) 252-9595; e-mail janice_coble@qmgate.anl.gov.
Mark W. Coffey, "Hall Force-Dominated Nonlinear Dynamics of Ultraclean High-Temperature Superconductors." To be published in Phys. Lett. A. Department of Chemistry and Biochemistry, Campus Box 215, University of Colorado, Boulder, CO 80309. Key words: vortex dynamics, nonlinear Schroedinger equation, nonlocal interaction, London theory, multiple scales analysis, solitons. 41.20.Jb; 03.40.Kf; 74.60.Ge; 74.20.De.
T. Dahm and D. J. Scalapino, "Theory of Intermodulation in a Superconducting Microstrip Resonator." Submitted to J. Appl. Phys. Department of Physics, University of California, Santa Barbara, CA 93106-9530; telephone (805) 893-2246; telefax (805) 893-8838; e-mail dahm@salar.physics.ucsb.edu.
B. Dam, C. Traeholt, B. Staeuble-Puempin, J. Rector, and D. G. de Groot, "The Relation Between the Defect Structure, the Surface Roughness and the Growth Conditions of YBa2Cu3O7-d Films." Faculty of Physics and Astronomy, Free University Amsterdam, De Boelelaan 1081, 1081 HV, THE NETHERLANDS; telephone +31 20 4447 917; telefax +31 20 4447 899; e-mail dam@nat.vu.nl.
Yehia M. Eyssa, W. Denis Markiewicz, and John Miller, "Quench, Thermal, and Magnetic Analysis Computer Code for Superconducting Solenoids." National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32306.
B. L. Fisher, M. T. Lanagan, U. Balachandran, S. Honjo, and T. Hara, "Fabrication and Design of a High-Current Downlink Using BiBased Superconductors." Presented at the Appl. Supercond. Conf. (ASC'96), Pittsburgh, PA, Aug. 25-30, 1996. Contact Janice Coble, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439; telefax (708) 252-9595; e-mail janice_coble@qmgate.anl.gov.
H. F. Fong, B. Keimer, D. L. Milius, and I. A. Aksay, "Superconductivity-Induced Anomalies in the Spin Excitation Spectra of Underdoped YBa2Cu3O6+x." Contact B. Keimer, Department of Physics, Princeton University, Princeton, NJ 08544; e-mail keimer@pupgg.princeton.edu. 74.25.Jb; 74.25.Kc; 74.72.Bk.
A. A. Golubov, M. R. Trunin, A. A. Zhukov, O. V. Dolgov, and S. V. Shulga, "Comparative Description of the Microwave Surface Impedance of Nb, BaKBiO, and YBaCuO." Manuscript #6.1081; to be published in Schegolev Memorial Vol. of J. de Physique I. Contact M. R. Trunin, Institute of Solid State Physics, 142432 Chernogolovka, Moscow District, RUSSIA; e-mail trunin@issp.ac.ru. 74.20.Fg; 74.25.Nf.
L. P. Gor'kov, "Quasi-One-Dimensional Organic Metals: Theory and Experiment." Manuscript #6.1128; to be published in Schegolev Memorial Vol. of J. de Physique I. National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32306-4005; telefax (904) 6445038; e-mail gorkov@magnet.fsu.edu. 71.20.Rv; 71.27.+a; 75.30.Fv.
Raju P. Gupta and Michele Gupta, "Effect of Radiation-Induced Oxygen Disorder on the Superconducting Transition Temperature in YBa2Cu3O7 Superconductors." Submitted to Phys. Rev. Lett. Section de Recherches de Metallurgie Physique, Centre d'Etudes Nucleaires de Saclay, F-91191 Gif sur Yvette Cedex, FRANCE. 74.62.Dh; 74.72.Bk.
B. Guettler, H. Dewing, L. Skuja, and G. Pindoria, "Metal Doping Effects in NIR Raman Spectra of YBCO Epitaxial Films." Presented at the Int. Conf. on Phys. and Chem. of Molecular and Oxide Supercond. (MOS'96), Karlsruhe, Germany, Aug. 2-6, 1996; to be published in J. Low Temp. Phys. (in press). Lab. 3.31, Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, GERMANY; telephone +49 531 592 1009; telefax +49 531 592 3015; e-mail bernd.guettler@ptb.de. 74.76.Bz; 74.25.Kc; 74.62.Dh.
W. Harneit, T. Klein, L. Baril, and C. Escribe-Filippini, "Evidence for Collective dTc Pinning in Superconducting (K,Ba)BiO3 Single Crystals." To be published in Europhys. Lett. Laboratoire d'Etudes des Proprietes Electroniques des Solides, Centre National de la Recherche Scientifique, BP166, F-38042 Grenoble Cedex 9, FRANCE.
R. H. Heffner, L. P. Le, G. J. Nieuwenhuys, D. E. MacLaughlin, A. Amato, F. N. Gygax, A. Schenck, J. S. Kim, G. Stewart, and H. R. Ott, "Evidence for Possible Orbital Magnetism Below the Superconducting Transition Temperature in UBe12.91B0.09." Presented at the Int. Conf. on Strongly Correlated Electron Systems (SCES'96), Zurich, Switzerland, Aug. 19-22, 1996. MS K764, Los Alamos National Laboratory, Los Alamos, NM 87545; telephone (505) 667-0397; telefax (505) 665-7652; e-mail heffner@rayleigh.lanl.gov. Key words: heavy-fermion superconductivity, 5SR.
R. Henn, T. Strach, E. Schoenherr, and M. Cardona, "Isotope Effects in the Optical Phonons of YBa2Cu3O7: Eigenvector and Infrared Charge Determination." Submitted to Phys. Rev. B. Max-Planck-Institute fuer Festkoerperforschung, Heisenbergstr. 1, D-70563 Stuttgart, GERMANY; telephone +49 711 689 1728; telefax +49 711 689 1712; e-mail henn@cardix.mpi-stuttgart.mpg.de. 63.20.Hp; 78.30.Er.
Roberto Iengo and Giancarlo Jug, "Edge Tunneling of Vortices in Superconducting Thin Films." International School for Advanced Studies, Via Beirut 4, I-34014 Trieste, ITALY. Giancarlo Jug's e-mail jug@sissa.it; preprint also available at cond-mat@xxx.lanl.gov (#9608059).
M. Isobe, J.-Q. Li, Y. Matsui, F. Izumi, Y. Kanke, and E. Takayama-Muromachi, "Synthesis, Crystal Structures and Superconductivity of New Copper Oxyfluorides, Sr2RCu2O5F (R = Y,La,Nd,Sm,Gd,Dy,Er and Yb)." To be published in Physica C (in press). National Institute for Research in Inorganic Materials (NIRIM) 1-1 Namiki, Tsukuba, Ibaraki 305, JAPAN; e-mail misobe@nirim.go.jp. Key words: high-Tc superconductor, high-pressure synthesis, oxyfluoride compounds, Sr2RCu2O5F, Rietveld analysis.
H.-C.I. Kao, Y. D. Leu, W. N. Huang, C. M. Wang, D. H. Chen, and T. J. Lee, "Rietveld Analysis and Superconductivity of La3xCa2xBa3-xCu6Oy Compounds." To be published in Supercond. Sci. & Technol. (in press). Department of Chemistry, Tamkang University, Tamsui 25137, Taiwan-REPUBLIC OF CHINA; telephone +886 2 625 1661; telefax +886 2 622 8458; e-mail kaohci@mail.tku.edu.tw. Key words: Rietveld, superconductivity, occupancy factor, La3-xCa2xBa3-xCu6Oy.
Kazushige Kawabata, Tomonori Kumagai, Makoto Mizutani, and Takashi Sambongi, "Twist Morphology of Organic Crystal (BPEDMB)IBr2." Manuscript #6.1088; to be published in Schegolev Memorial Vol. of J. de Physique I. Department of Physics, Graduate School of Science, Hokkaido University, Sapporo 060, JAPAN; telefax +81 11 746 5444; e-mail kaw@skws.phys.hokudai.ac.jp. 61.66.Hq; 68.70.+w; 61.72.Ff.
C. D. Keener, M. L. Trawick, S. M. Ammirata, S. E. Hebboul, and J. C. Garland, "Nonlocal Conductivity in Bi2Sr2CaCu2O8+d Crystals." Submitted to Phys. Rev. B. Department of Physics, Ohio State University, 174 W. 18th Ave., Columbus, OH 43210; telephone (614) 292-3426; e-mail keener@mps.ohio-state.edu. 74.25.Dw; 74.25.Fy; 74.60.Ge; 74.72.Hs.
C. D. Keener, M. L. Trawick, S. M. Ammirata, S. E. Hebboul, and J. C. Garland, "Vortex Lattice Melting and Interlayer Coupling in Bi2Sr2CaCu2O8+d Crystals." Presented at the XXI Int. Conf. on Low Temperature Phys. (LT21), Prague, Czech Republic, Aug. 8-14, 1996; to be published in Czech. J. Phys. Department of Physics, Ohio State University, 174 W. 18th Ave., Columbus, OH 43210; telephone (614) 2923426; e-mail keener@mps.ohio-state.edu.
Nellie R. Khasanova, Fujio Izumi, Minako Shida, Bryan C. Chakoumakos, Eriko Ohshima, Masae Kikuchi, and Yasuhiko Syono, "Structural Disorder and Charge Transfer in the Superconductor (Pb0.5Cu0.5)(Sr0.5La0.5)2CuO5+d." To be published in Physica C (in press). National Institute for Research in Inorganic Materials, 1-1 Namiki, Tsukuba, Ibaraki 305 JAPAN; telefax +81 298 52 7449; e-mail nellie@nirim.go.jp. Key words: crystal structure, oxygen defects, neutron diffraction.
Philip Kim, Zhen Yao, and Charles M. Lieber, "Structure of Vortex Arrays by Magnetic Decoration." Division of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138; Charles M. Lieber's e-mail cml@cmliris.harvard.edu.
Philip Kim, Zhen Yao, and Charles M. Lieber, "Vortex Lattice Structure in Bi2Sr2CaCu2O8+d at High Temperatures." Division of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138. 74.60.Ge; 74.60.Ec; 74.72.Hs; 61.18.-j.
Alexander Klushin, Alexander Golubov, Werner Prusseit, and Hermann Kohlstedt, "Comparative Study of Shunted Bicrystal Josephson Junctions." Submitted to J. Low Temp. Phys. Forschungszentrum Juelich GmbH (KFA), D-52425 Juelich, GERMANY; e-mail klushin@isitel1.isi.kfajuelich.de. 74.50.+r; 74.76.Bz; 85.25.Cp; 85.25.Jw.
Alexander M. Klushin, Werner Prusseit, Erik Sodtke, Levon E. Amatuni, and Hermann Kohlstedt, "External Frequency Locking in Shunted Bicrystal Josephson Junction Arrays." Presented at the XXI Int. Conf. on Low Temperature Phys. (LT21), Prague, Czech Republic, Aug. 814, 1996; to be published in Czech. J. Phys. Forschungszentrum Juelich GmbH (KFA), D-52424 Juelich, GERMANY; e-mail klushin@isitel1.isi.kfajuelich.de.
Thomas Kodenkandath, Gianluca Calestani, and Francesco C. Matacotta, "Stabilization of Ba2CuO2CI2 with K2NiF4 Structure by Chemical Substitution." To be published in J. Mater. Chem. Department of Materials, Imperial College, Prince Consort Road, London SW7 2BP, UNITED KINGDOM; telephone +44 171 589 5111, ext. 56761; telefax +44 171 584 3194; e-mail t.kodenkandath@ic.ac.uk.
S. Kolesnik, T. Skoskiewicz, J. Igalson, and Z. Tarnawski, "Experimental Observation of the Lock-in Transition in Bi-Sr-Ca-Cu-O Crystals Near the Lower Critical Field." To be published in Phys. Rev. B. Atominstitut Der OEsterreichischen Universitaeten, Schuettelstrasse 115, A-1020 Wien, AUSTRIA; telephone +43 1 72 701 296; telefax +43 1 728 9220; e-mail kolesnik@ati.ac.at.
N. D. Kushch, O. A. Dyachenko, V. V. Gritsenko, S. I. Pesotskii, R. B. Lubovskii, P. Cassoux, Ch. Faulmann, A. E. Kovalev, M. V. Kartsovnik, L. Brossard, H. Kobayashi, and A. Kobayashi, "BETS4Cu2CI6 and BETS2Fe0.75Ga0.25CI4, New Organic Metals of the BETS Family: Synthesis, Structure, and Properties." Manuscript #6.1095; to be published in Schegolev Memorial Vol. of J. de Physique I. Institute of Chemical Physics in Chernogolovka, Russian Academy of Sciences, 142432 Chernogolovka, RUSSIA; telefax +7 96 515 35 88; e-mail kushch@icp.ac.ru.
Tatsuya Kushida, Shigehiro Nishijima, and Toichi Okada, "Calculation of Wire Motion in a Superconducting Magnet." ISIR, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567, JAPAN.
Th. Lang, D. Buhl, M. Cantoni, B. Hallstedt, D. Risold, S. Al-Wakeel, D. Schneider, and L. J. Gauckler, "Microstructural Evolution During the Partial Melt Processing of Bi-2212 Thick Films." Submitted to J. Mater. Res. Eidgenoessische Technische Hochschule (ETH) Zurich, Department of Materials, Institute for Nonmetallic Materials, Swiss Federal Institute of Technology, CH-8092 Zurich, SWITZERLAND; telephone +41 1 632 56 51; telefax +41 1 632 11 32; e-mail tlang@nonmet.mat.ethz.ch.
Th. Lang, D. Buhl, D. Schneider, S. Al-Wakeel, and L. J. Gauckler, "Texture in Melt Processed Bi-2212." Submitted to J. Electroceramics. Eidgenoessische Technische Hochschule (ETH) Zurich, Department of Materials, Institute for Nonmetallic Materials, Swiss Federal Institute of Technology, CH-8092 Zurich, SWITZERLAND; telephone +41 1 632 56 51; telefax +41 1 632 11 32; e-mail tlang@nonmet.mat.ethz.ch.
R. B. Laughlin, "Evidence for Quasiparticle Decay in Photoemission from Underdoped Cuprates." Department of Physics, Stanford University, Stanford, CA 94305; e-mail rbl@large.stanford.edu; preprint also available at supr-con@xxx.lanl.gov (#9608005). 74.20.Mn; 74.72.-h; 79.60.-i.
L. P. Le, R. H. Heffner, D. E. MacLaughlin, K. Kojima, G. M. Luke, B. Nachumi, Y. J. Uemura, J. L. Sarrao, and Z. Fisk, "Magnetic Behavior in Li-Doped La2CuO4." To be published in Phys. Rev. B. Center for Materials Science, Mail Stop K675, Los Alamos National Laboratory, Los Alamos, NM 87545; telephone (505) 667-9243; telefax (505) 665-2992. 74.72.Dn; 75.50.Ee; 75.30.Kz; 76.75.+i.
M. Lelovic, T. Deis, N. G. Eror, U. Balachandran, and P. Haldar, "Effect of Cooling Rates on Transport Current Properties and Critical Temperature of Ag-Sheathed BSCCO-2223 Superconducting Tapes." Submitted to Supercond. Sci. & Technol. Department of Materials Science, University of Pittsburgh, Pittsburgh, PA 15261.
Kazumi Maki, Ye Sun, and Hyekyung Won, "d-Wave Superconductors in a Magnetic Field." Presented at the XXI Int. Conf. on Low Temperature Phys. (LT21), Prague, Czech Republic, Aug. 8-14, 1996. Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089-0484.
Kazumi Maki and Hyekyung Won, "Vortex State in d-Wave Superconductivity." Presented at the Int. Conf. on Strongly Correlated Electron Systems (SCES'96), Zurich, Switzerland, Aug. 19-22, 1996; to be published in Physica B. Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089-0484; telephone (213) 7408405; telefax (213) 740-6653; e-mail kmaki@usc.edu. Key Words: d-wave superconductivity, high-Tc cuprates, vortex state.
A. N. Malakhov and A. L. Pankratov, "Influence of Thermal Fluctuations on Time Characteristics of Single Josephson Element with High Damping Exact Solution." To be published in Physica C (in press). Radiophysical Department, Nizhny Novgorod State University, 23 Gagarin Ave., Nizhny Novgorod 603600, RUSSIA; e-mail askmal@rf.unn.runnet.ru. Key words: fluctuation effects, Josephson effect, Josephson junction.
J. I. Martin, M. Velez, F. Guinea, and J. L. Vicent, "Flux Flow Resistivity and Vortex Viscosity of High-Tc Films." Departamento de Fisica de Materiales, Facultad de Fisicas, Universidad Complutense, 28040 Madrid, SPAIN; e-mail paco@ccuam3.sdi.uam.es; preprint also available at supr-con@xxx.lanl.gov (#9607003).
J. C. Martinez, B. Dam, B. Staeuble-Puempin, G. Doornbos, R. Surdeanu, U. Poppe, and R. Griessen, "Influence of Microstructure in the Low Temperature Critical Currents of YBa2Cu3O7-d Thin Films." Presented at the Int. Conf. on Phys. and Chem. of Molecular and Oxide Supercond. (MOS'96), Karlsruhe, Germany, Aug. 2-6, 1996; to be published in J. Low Temp. Phys. Institut fuer Physik, Johannes GutenbergUniversitaet, Staudingerweg 7, D-55099 Mainz, GERMANY; telephone +49 6131 39 3633; telefax +49 6131 39 5156; e-mail martinez@mail.unimainz.de. 74.60.Jg; 74.72.Bk; 74.76.Bz.
G. C. McIntosh and A. B. Kaiser, "The van Hove Scenario and Thermopower Behavior of the High-Tc Cuprates." To be published in Phys. Rev. B. Physics Department, Victoria University of Wellington, P.O. Box 600, Wellington, NEW ZEALAND.
Bozidar Mitrovic and Melissa Castle, "Strong Coupling Theory of the Interlayer Tunneling Model for High Temperature Superconductors." Submitted to Phys. Rev. B (in press). Department of Physics, Brock University, St. Catharines, Ontario, CANADA L2S 3A1; telephone (905) 688-5550 ext. 3412; telefax (905) 682-9020; e-mail mitrovic@newton.physics.brocku.ca; preprint also available at suprcon@xxx.lanl.gov (#9608006). 74.20.-z; 74.20.Mn; 74.72.-h.
Katerina Moloni, Mark Friesen, Shi Li, Victor Souw, P. Metcalf, Lifang Hou, and M. McElfresh, "3DXY and Lowest Landau Level Fluctuations in Deoxygenated YBa2Cu3O7-d Thin Films." Submitted to Phys. Rev. Lett. Department of Physics, Purdue University, 1396 Physics Building, West Lafayette, IN 47907-1396; telephone (317) 494 3015; telefax (317) 494 0706; e-mail moloni@physics.purdue.edu. Key words: superconducting critical phenomena. 74.25.Bt; 74.25.Dw; 74.72.h.
Hatsumi Mori, Shoji Tanaka, and Takehiko Mori, "Magnetic Properties of Coexistent System of Itinerant and Localized Electrons, (BEDT-TTF)2MCo(SCN)4 [M=K, Rb, Cs]." Manuscript #6.1091; to be published in Schegolev Memorial Vol. of J. de Physique I. Superconductivity Research Laboratory, International Superconductivity Technology Center (ISTEC), 10-13 Shinonome 1-chome, Koto-ku, Tokyo 135, JAPAN; telephone +81 3 3536 0618; telefax +81 3 3536 5714. 71.20.Rv; 71.30.+h; 71.70.Ch.
T. Mori, S. Ono, H. Mori, and S. Tanaka, "Angle Dependent Magnetoresistance Oscillations and Thermoelectric Power of (BO)2CI(H2O)x." Manuscript #6.1034; to be published in Schegolev Memorial Vol. of J. de Physique I. Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Tokyo 152, JAPAN; telefax +81 3 5734 2876; e-mail takehiko@o.cc.titech.ac.jp. 71.20.Rv; 71.18.+y; 71.20.-b.
Alexander Nazarenko and Elbio Dagotto, "Hole Dispersion and Symmetry of the Superconducting Order Parameter for Underdoped CuO2 Bilayers and 3D Antiferromagnets." Department of Physics and National High Magnetic Field Lab, Florida State University, Tallahassee, FL 32306; preprint also available at cond-mat@xxx.lanl.gov (#9605082). 74.20.-z; 74.20.Mn; 74.25.Dw.
Shigehiro Nishijima, Tatsuya Kushida, Toichi Okada, and Shingo Namba, "Simulation of Wire Movement in a Superconducting Coil." ISIR, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567, JAPAN.
I. Olejniczak, A. Graja, N. D. Kushch, P. Cassoux, and H. Kobayashi, "Polarized IR Relectance Studies of the Organic Conductor k-(BETS)2FeCI4." Manuscript #6.1044; to be published in Schegolev Memorial Vol. of J. de Physique I. Contact A. Graja, Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiege 17, PL60179 Poznan, POLAND; telefax +48 61 684 524; e-mail graja@ifmpan.poznan.pl. 78.30.Jw; 74.25.Gz; 71.38.+i.
R. J. Ormeno, D. C. Morgan, D. M. Broun, S. F. Lee, and J. R. Waldram, "Sapphire Resonator for the Measurement of Surface Impedance of High Temperature Superconducting Thin Films." Submitted to Rev. Sci. Instrum. Interdisciplinary Research Centre in Superconductivity, University of Cambridge, Madingley Road, Cambridge CB3 0HE, UNITED KINGDOM; D. M. Broun's telephone +44 1223 337 252; telefax +44 1223 337 351.
Michael S. Pambianchi, C. Kwon, T. Venkatesan, and Steven M. Anlage, "Surface Impedance of YBa2Cu3O7/Y0.6Pr0.4Ba2Cu3O7 Bilayers: Possible Evidence for the Proximity Effect." To be published in Phys. Rev. B. Contact Steven Anlage, Department of Physics, Center for Superconductivity Research, University of Maryland, College Park, MD 20742-4111; telephone (301) 405-7321; telefax (301) 405-3779; e-mail anlage@squid.umd.edu. Key words: superconductors, proximity effect, microwave properties, YBa2Cu3O7-d, thin films, Y-Pr-Ba-Cu-O. 74.50.+r; 74.25.Nf; 74.80.Dm; 74.72.Bk; 74.76.Bz.
V. Polushkin, M. Wallis, D. Glowacka, A. Matthews, and John M. Lumley, "A Miniature SQUID Magnetometer Based on the Superconducting Quantum Interference Device with Direct Read-out Electronics." Oxford Instruments, Scientific Research Division, Newton House, Cambridge Business Park, Cowley Road, Cambridge CB4 4WZ, UNITED KINGDOM; telephone +44 1223 427400; telefax +44 1223 425050; e-mail enquiry@oiritfg.demon.co.uk.
M. Pozek, H. U. Habermeier, A. Maier, and M. Mehring, "Local Field Distribution of the Vortex Lattice Near the Surface of Type-II Superconductors: Magnetic Resonance Lineshapes." To be published in Physica C (in press). Contact M. Mehring, Physikalisches Institut, Universitaet Stuttgart, D-70550 Stuttgart, GERMANY; telefax +49 711 685 5285; e-mail mehring@physik.uni-stuttgart.de. Key words: ESR, flux lattice, thin films, London penetration depth.
R. Prozorov, M. Konczykowski, B. Schmidt, Y. Yeshurun, A. Shaulov, C. Villard, and G. Koren, "On the Origin of the Irreversibility Line in Thin YBa2Cu3O7-d Films with and without Columnar Defects." To be published in Phys. Rev. B. Department of Physics, Institute of Superconductivity, Bar-Ilan University, 52900 Ramat-Gan, ISRAEL; e-mail prozorr@ashur.cc.biu.ac.il or http://www.biu.ac.il:80/`prozorr/preprints.html; preprint also available at supr-con@xxx.lanl.gov (#9608008). 74.60.Ge; 74.60.Jg.
P. Przyslupski, S. Kolesnik, E. Dynowska, T. Skoskiewicz, and M. Sawicki, "Fabrication and Properties of YBa2Cu3O7/RE1-xAxMnO3-y Multilayers." Presented at the Appl. Supercond. Conf. (ASC'96), Pittsburgh, PA, Aug. 25-30, 1996. Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, PL-02668 Warszawa, POLAND.
J. W. Radcliffe, J. W. Loram, J. M. Wade, G. Wltschek, and J. L. Tallon, "Electronic Specific Heat of Overdoped TI2Ba2CuO6+d in a Magnetic Field." Presented at the Int. Conf. on Phys. and Chem. of Molecular and Oxide Supercond. (MOS'96), Karlsruhe, Germany, Aug. 2-6, 1996; to be published in J. Low Temp. Phys. IRC in Superconductivity, University of Cambridge, Madingley Road, Cambridge, CB3 OHE, UNITED KINGDOM; telefax +44 1223 337 074; e-mail jwr1003@cam.ac.uk. 74.25.Bt; 74.72.Fq.
C. Schlenker, C. Hess, C. Le Touze, and J. Dumas, "Charge Density Wave Properties of Quasi Low-Dimensional Transition Metal Oxide Bronzes." Manuscript #6.1093; to be published in Schegolev Memorial Vol. of J. de Physique I. Laboratoire d'Etudes des Proprietes Electroniques des Solides, CNRS - BP 166, F-38042 Grenoble Cedex 9, FRANCE; telephone +33 76 88 1086; telefax +33 76 88 7988; e-mail schlenke@lepes.polycnrs-gre.fr. 71.45.Lr; 72.15.Eb; 72.15.Gd.
Th. Schuster, H. Kuhn, A. Weisshardt, H. Kronmueller, B. Roas, O. Eibl, M. Leghissa, and H.-W. Neumueller, "Current Capability of Filaments Depending on their Position in (Bi,Pb)2Sr2Ca2Cu3O10+d Multifilament Tapes." To be published in Appl. Phys. Lett. Max-Planck-Institut fuer Metallfoerschung, Heisenbergstrasse 1, Postfach 80 06 65, D-70506 Stuttgart, GERMANY; telephone +49 711 6 89 1801; telefax +49 711 6 89 1010; e-mail schuster@vaxphy.mpi-stuttgart.mpg.de.
Okram G. Singh, C. S. Harendranath, Om Prakash, and B. D. Padalia, "Direct Experimental Evidence for the Local Oxygen NonStoichiometry in Electron-Doped Nd2-xCexCuO4-d." To be published in Solid State Commun. (in press). Department of Physics, Indian Institute of Technology, Powai, Mumbai 400076, INDIA. Key words: high-Tc superconductors, grain boundaries, scanning and transmission electron microscopy.
E. D. Specht, A. Goyal, D. M. Kroeger, A. Mogro-Campero, P. J. Bednarczyk, J. E. Tkaczyk, and J. A. DeLuca, "Critical Current, Film Thickness, and Grain Alignment for Spray-Pyrolyzed Films of TIBa2Ca2Cu3Ox." To be published in Physica C. Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 378431-6118; telephone (423) 574-7682; telefax (423) 574-7659; e-mail esy@ornl.gov.
M. St. Louis-Weber, V. P. Dravid, V. R. Todt, X. F. Zhang, D. J. Miller, and U. Balachandran, "Transport Properties of an Engineered (001) Tilt Series in Bulk YBa2Cu3O7-x Bicrystals." Submitted to Phys. Rev. B. Materials Science and Engineering, Science and Technology Center for Superconductivity, Northwestern University, Evanston, IL 60208.
Thomas Staiger, Guenter Fuchs, Peter Verges, Klaus Fischer, Ludwig Schultz, and Alexander Gladun, "Critical Current in Silver Sheathed Bi-2223 Tapes." Presented at the Appl. Supercond. Conf. (ASC'96), Pittsburgh, PA, Aug. 25-30, 1996; submitted to IEEE Trans. on Appl. Supercond. Institut fuer Festkoerper-und Werkstofforschung Dresden, D-01171 Dresden, GERMANY; telephone +49 351 4659 553; telefax +49 351 4659 537; e-mail t.staiger@ifw-dresden.de.
M. D. Strikovskiy and A. Engelhardt, "Ramp-Type YBa2Cu3O7-d Josephson Junctions with High Characteristic Voltage, Fabricated by a New, Completely In-Situ, Growth Technique." Submitted to Appl. Phys. Lett. Institut fuer Schicht-und Ionentechnik (ISI), Forschungszentrum Juelich (KFA), D-52425 Juelich, GERMANY. 68.65+.g; 81.15-.z.
Ye Sun and Kazumi Maki, "Comparison Between d-Wave Superconductor with Nonmagnet Impurities and s-Wave Superconductor with Magnetic Impurities." Presented at the Int. Conf. on Strongly Correlated Electron Systems (SCES'96), Zurich, Switzerland, Aug. 19-22, 1996. Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089-0484; Kazumi Maki's telefax (213) 740-6653; e-mail kmaki@usc.edu. Key words: d-wave superconductivity, high-Tc cuprates, impurity scattering.
Uwe C. Taeuber and David R. Nelson, "Superfluid Bosons and Flux Liquids: Disorder, Thermal Fluctuations, and Finite-Size Effects." Department of Physics, Theoretical Physics, University of Oxford, 1 Keble Road, Oxford OX1 3NP, UNITED KINGDOM; telephone +44 1865 273 963; telefax +44 1865 273 947; e-mail tauber@thphys.ox.ac.uk. Key words: superfluidity, flux liquids, disorder influence, finite-size effects. 05.30.Jp; 67.40.Yv; 74.60.Ge.
M. A. Teplov, O. N. Bakharev, A. V. Dooglav, A. V. Egorov, E. V. Krjukov, I. R. Mukhamedshin, Yu. A. Sakhratov, H. B. Brom, and J. Witteveen, "Tm NMR and Cu NQR Studies of Phase Separation in TmBaCuO Compounds." To be published in the Proc. of the NATO Advanced Study Institute on Materials Aspects of High Tc Superconductivity: Ten Years after the Discovery, Delphi, Greece, Aug. 19-31, 1996. Kazan State University, 420008 Kazan, RUSSIA.
Hidekazu Teshima, Mitsuru Morita, and Misao Hashimoto, "Comparison of the Levitation Forces of Melt-Processed YBaCuO Superconductors for Different Magnets." To be published in Physica C (in press). Advanced Technology Research Laboratories, Nippon Steel Corporation, 1618 Ida, Nakahara-ku, Kawasaki 211, JAPAN; telefax +81 44 752 5759; e-mail hteshima@lab1.nsc.co.jp. Key words: superconducting levitation, levitation force, superconductors, melt-processed YBaCuO bulk materials.
T. R. Thurston, P. Haldar, Y. L. Wang, M. Suenaga, N. M. Jisrawi, and U. Wildgruber, "In Situ Measurements of Texture and Phase Development in (Bi,Pb)2Sr2Ca2Cu3O10-Ag Tapes." Submitted to J. Appl. Phys. Department of Physics, Building 510B, Brookhaven National Laboratory, Upton, NY 11973; telephone (516) 282-7829; e-mail tom@solids.phy.bnl.gov.
N. Thyssen, A. V. Ustinov, and H. Kohlstedt, "Flux Flow and Resonant Modes in Multi-Junction Josephson Stacks." Presented at the Weak Supercond. Symp. (WSS'96), Smolenice, Slovak Republic, Aug. 4-7, 1996; To be published in J. Low Temp. Phys. ISI, Research Center, Institut fuer Festkoerperforschung, KFA Juelich, D-52425 Juelich, GERMANY.
Yzhak Tsabba and Shimon Reich, "Giant Mass Anisotropy and High Critical Current in Hg-1223 Superconducting Films." To be published in Physica C (in press). Contact Shimon Reich, Department of Materials and Interfaces, The Weizmann Institute of Science, Rehovot, ISRAEL; telefax +972 8 344 137.
A. V. Ustinov, H. Kohlstedt, and P. Henne, "Time-Domain Response of Displaced Linear Branch in Long Josephson Junction." Presented at the Proc. of the XXI Int. Conf. on Low Temperature Phys. (LT21), Prague, Czech Republic, Aug. 8-14, 1996; to be published in Czech J. Phys. Institute of Thin Film and Ion Technology, Research Center, KFA Juelich, D-52425 Juelich, GERMANY.
Alexey V. Ustinov and Hermann Kohlstedt, "Interlayer Fluxon Interaction in Josephson Stacks." Institute of Thin Film and Ion Technology, Research Center, KFA Juelich, D-52425 Juelich, GERMANY. 74.50.+r; 03.40.Kf; 74.80.Dm; 41.20.Jb.
Alexey V. Ustinov and Norbert Thyssen, "Experimental Study of Fluxon Dynamics in a Harmonic Potential Well." Presented at the Weak Supercond. Symp. (WSS'96), Smolenice, Slovak Republic, Aug. 4-7, 1996; to be published in J. Low Temp. Phys. Institute of Thin Film and Ion Technology, Research Center, KFA Juelich, D-52425 Juelich, GERMANY. 74.50.+r; 03.40.Kf; 03.65.Pm.
I. Utke, C. Klemenz, H. J. Scheel, and P. Nueesch, "HighTemperature X-Ray Measurements of Gallates and Cuprates." Presented at the Ninth Int. Conf. on Vapor Growth and Epitaxy, Vail, Colorado, Aug. 4-9, 1996; to be published in the Proc. ICVGE-9 and in J. Cryst. Growth. Cristallogenese, Chemin de Bellerive 34, CH-1007 Lausanne, SWITZERLAND; telephone +41 21 693 4741; telefax +41 21 693 4750; e-mail ivor.utke@imo.dp.epfl.ch. Key words: high-Tc superconductors, misfit, epitaxy, thermal expansion, YBa2Cu3O7, NdBa2Cu3O7, LaGaO3, NdGaO3, PrGaO3.
I. Utke, C. Klemenz, H. J. Scheel, M. Sasaura, and S. Miyazawa, "Misfit Problems in Epitaxy of High-Tc Superconductors." Presented at the Ninth Int. Conf. on Vapor Growth and Epitaxy, Vail, Colorado, Aug. 4-9, 1996; to be published in the Proc. ICVGE-9 and in J. Cryst. Growth. Cristallogenese, Chemin de Bellerive 34, CH-1007 Lausanne, SWITZERLAND; telephone +41 21 693 4741; telefax +41 21 693 4750; e-mail ivor.utke@imo.dp.epfl.ch. Key words: high-Tc superconductors, misfit, epitaxy, thermal expansion, YBa2Cu3O7, NdBa2Cu3O7, LaGaO3, NdGaO3, PrGaO3.
U. Wiesner, W. Bieger, and G. Krabbes, "Determination of Phase Diagrams by Heat Evaluation from DTA: The Section YBa2Cu3O7-x BaCuO2." Submitted to Thermochim. Acta. Institut fuer Festkoerper- und Werkstofforschung Dresden, D-01171 Dresden, GERMANY; telefax +49 351 2582 314; e-mail krabbes@ifw-dresden.de.
J. Wosnitza, G. Goll, D. Beckmann, S. Wanka, D. Schweitzer, and W. Strunz, "The Fermi Surfaces of beta-(BEDT-TTF)2X." Manuscript #6.1082; to be published in Schegolev Memorial Vol. of J. de Physique I. Physikalisches Institut, Universitaet Karlsruhe, Engesserstr. 7, D-76128 Karlsruhe, GERMANY; telephone +49 721 608 3515; telefax +49 721 608 6103; e-mail wosnitza@fphvax.physik.uni-karlsruhe.de. 71.18.+y; 74.70.Kn.
Victor M. Yakovenko and Hsi-Sheng Goan, "Quantum Hall Effect in Quasi-One-Dimensional Conductors: The Roles of Moving FISDW, Finite Temperature, and Edge States." Manuscript #6.1152; to be published in Schegolev Memorial Vol. of J. de Physique I. Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, MD 20742-4111; telephone (301) 405-6151; telefax (301) 314-9465; e-mail yakovenko@alexander.physics.umd.edu. 73.40.Hm; 72.15.Nj; 72.80.Le.
Jaimoo Yoo, Hyungsik Chung, Jaewoong Ko, and Haidoo Kim, "Effect of Au and Mg Addition to Ag Sheath on Microstructure and Superconducting Properties of BSCCO-2223 Tapes." To be published in Physica C (in press). Korea Institute of Machinery and Materials, 66 Sangnam-dong, Changwon 641-010 KOREA; telefax +82 551 80 3599. Key words: silver alloys, high-temperature superconductivity, electrical resistivity, hardness.
Y. Yoshida, Y. Ito, I. Hirabayashi, H. Nagai, and Y. Takai, "Surface Morphology and Growth Mechanism of YBa2Cu3O7-y Films by Metalorganic Chemical Vapor Deposition Using Liquid Sources." Submitted to Appl. Phys. Lett. Superconductivity Research Laboratory, International Superconductivity Technology Center, Nagoya 456, JAPAN. Key words: YBa2Cu3O7-y thin film, MOCVD, surface morphology, liquid source.
C. C. Yuan, H.-C.I. Kao, and C. M. Wang, "Preparation, Structure and Peritectic Transition of La1.3-x/2SrxBa1.5-x/2Cu3Oy Superconductors." To be published in Mater. Res. Bull. Department of Chemistry, Tamkang University, Tamsui 25137, Taiwan-REPUBLIC OF CHINA. Key words: oxides, superconductors, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), x-ray diffraction.
I. Zelenay, A. Das, and R. Suryanarayanan, "Hole Delocalization by Isovalent Sr Substitution in Nd0.7Pr0.3Ba2-kSrkCu3O7." To be published in Phys. Lett. A. Contact R. Suryanarayanan, Laboratoire de Chimie des Soldies, UA 446, CNRS Bat. 414, Universite Paris-sud, F-91405 Orsay, FRANCE. Key words: insulator-superconductor transition, hybridization, Nd(Pr)SrBaCuO. 74.20.Fg.
Y. H. Zhang, A. S. Parikh, and K. Salama, "Study of Superconducting Properties in Melt Textured YBCO Levitators." Preprint #96:095; submitted to the Proc. of the Appl. Supercond. Conf. (ASC'96), Pittsburgh, PA, Aug. 25-30, 1996. Texas Center for Superconductivity, University of Houston, Houston, TX 77204-5932; telephone (713) 743-8200; telefax (713) 743-8201; e-mail preprints@www.tcs.uh.edu.
*Oct. 21 - 24, 1996: 9th International Symposium on Superconductivity (ISS'96), Sapporo, Hokkaido, Japan. Organized by the International Superconductivity Technology Center (ISTEC). Symposium will consist of oral and poster sessions and invited talks in the following fields of superconductivity: physics -- theory, physical properties, and new measurement techniques; chemistry -- new materials and syntheses, substitution, solid-state chemistry, and properties; flux pinning -- mechanism and electromagnetic properties of fluxoids; wires, tapes, and bulk -- solid-state powder ceramics, chemical-solution processing, melting solidification, and chemical-vapor deposition; thin films -- processing, properties, and lithography; device applications -- digital, analog, SQUID, and other electronic devices; system applications -- power, power transportation, magnets, magnetic shields, and other system applications. Proceedings to be published. Official language is English. For further information, contact ISS'96 Secretariat, ISTEC, Eishin Kaihatsu Bldg. 6F, 34-3 Shimbashi 5-chome, Minato-ku, Tokyo 105, Japan; telephone +81 3 3431-4002; telefax +81 3 3431-4044; e-mail chyoki@istec.mxa.meshnet.or.jp.
Dec. 8 - 12, 1996: International Conference on Stripes, Lattice Instabilities, and High Tc Superconductivity, Rome, Italy. Purpose of this conference is to provide an opportunity to discuss the rapidly expanding experimental data showing mesoscopic structure and lattice anomalies in high-temperature superconductors and related theoretical works relevant to high-Tc superconductivity. The following topics will be included: lattice instabilities (static and dynamic fluctuations), superconductivity in inhomogeneous lattices, experimental and theoretical components, stripe structures at mesoscopic scales, phase separation, superstructures, intrinsic Josephson effect, superconductivity in low dimension, superconductivity in artificial modulated structures, and quantum Hall effect and superconductivity. Invited or contributed oral presentations and posters. For information, contact Antonio Bianconi, Dipartimento di Fisica, Universita' di Roma "La Sapienza", P. le Aldo Moro, 2, 00185 Roma, Italy; telephone +39 6 4991-4405 or -4612; telefax +39 6 -4957697 or -4463158; e-mail bianconie@roma1.infn.it. Information also available at the URL http://g4risc.roma1.infn.it/confhome.it.
Jan. 12 - 17, 1997: Gordon Research Conference on Superconductivity, Colony Harbor Hotel, Ventura, CA. Program thus far includes invited speakers who will discuss the following topics: basic theory, vortices, materials, photoemission, optical properties, d-wave and s-wave superconductivity, normal-state properties, charge and flux quantization, stripe phases, tunneling, and nickel borides. Both oral and poster sessions are included and abstracts are requested for poster papers. Requests for registration forms and abstracts should be sent to Gordon Research Conferences, University of Rhode Island, P.O. Box 984, West Kingston RI 02892-0984; telefax (401) 783-7644; e-mail app@grcmail.grc.uri.edu. For further information, contact D. K. Finnemore, Ames Laboratory-USDOE and Department of Physics, Iowa State University, Ames, IA 50011-3160; telephone (515) 294-3455; telefax (515) 294-0689; e-mail finnemore@ameslab.gov.
*March 6 - 8, 1997: International Workshop on Critical Currents in Superconductors for Practical Applications (SPA '97), Xi'an, China. Satellite conference to the Fifth International Conference on Materials and Mechanisms of Superconductivity (M2S-HTSC-V) at Beijing. SPA'97 will concentrate on improvement of practical superconducting materials and their applications. Main topics are synthesis and processing of practical materials; properties of high-Tc tapes, cables, coils, and bulk materials; critical currents and microstructures; flux dynamics and pinning mechanisms; applications of high-Tc and low-Tc materials; processing and physical properties of high-Tc films; and applications of high-Tc films. Conference language is English. Abstract deadline, December 1, 1996; authors notified of acceptance by January 1, 1997. For information, contact P. X. Zhang, Conference Secretary, SPA '97, Northwest Institute for Nonferrous Metal Research, P.O. Box 51, Xi'an, Shaanxi 710016, People's Republic of China; telephone +86 29 6231079; telefax +86 29 6231103; e-mail pxzhang@xjtu.edu.cn.
June 30 - July 3, 1997: 3rd European Conference on Applied Superconductivity (EUCAS'97), Veldhoven, The Netherlands. Objective is to provide an up-to-date and comprehensive overview of research and development activities in applications of all classes of superconductors. Conference aims to encourage new cooperations on European and wider international levels. Will include 4 plenary sessions, 21 oral sessions, and 4 poster sessions with keynote lecture at the beginning of each oral session. One plenary session will be devoted to industrial applicability of superconductivity and industrial perspective. Program will be broadly divided into small-scale & electronic applications, and large-scale & power applications. Former category will include Josephson junctions, SQUIDs, digital applications, mixers/detectors, passive devices, oscillators, materials aspects related to superconducting electronics, system aspects, and other applications. Latter category will include fusion and SMES, detectors and accelerators; motors, generators, high magnetic fields, power applications, materials aspects related to large-scale applications, system aspects, and other applications. For general conference information, contact Convention Bureau Basics, P.O. Box 217, 7500 AE, Enschede, The Netherlands; telephone +31 53-4894444; telefax +31 534894442; e-mail a.spierenburg@basics.utwente.nl. For scientific queries, contact eucas@tn.utwente.nl. Information also available at the web site http://eucas.tn.utwente.nl/eucas/intro.htm.
*July 27- Aug. 1, 1997: International Cryogenic Engineering Conference and the International Cryogenic Materials Conference (Joint ICMC-CEC 1997 Conference), Oregon Convention Center, Portland, OR. Intended for those interested in cryogenic applications of engineering and materials. Includes special focus on superconductivity (LTS and HTS). CEC focuses on science and engineering required for cryogenic applications. Examples of topics in past conferences include liquified gases for fuels; space applications of cryogenic liquids; cooling and performance of superconducting magnet systems in medical, transportation, power, and basic research applications; as well as the systems, machinery, control technology, and thermodynamics required to produce low temperatures. ICMC focuses on the development, characterization, fabrication, and optimization of the materials used in cryogenic applications. ICMC is typically broken into two broad categories: structural materials and superconducting materials. Covers both high- and low-temperature superconducting materials from basic materials research to behavior of composite cables and wires in applications. Cryo Expo will be held in conjunction with conference. Abstract deadline, December 20, 1996. For further information, contact Bill Warnes, Oregon State University, Mechanical Engineering Dept., Corvallis, OR 97331-6001; telephone (541) 737-7016; e-mail warnesw@engr.orst.edu; or Nancy Wilson, Exe-Me and Company, P.O. Box 25445, Portland, OR 97298-0445; telephone (503) 292-2114; e-mail ewemeco@europa.com. Information also available at the web site http://www.orst.edu/groups/icmc97.
*Sept. 14 - 18, 1997: Conference on Spectroscopies in Novel Superconductors (SNS '97), Sea Crest Oceanfront Resort and Conference Center, Falmouth, Cape Cod, MA. Conference sponsored by the College of Arts and Sciences as part of centennial celebration of the founding of Northeastern University. For further information, contact Prof. Arun Bansil, Conference Chair, Dept. of Physics, Northeastern University, Boston, MA 02115; telephone (617) 373-2923; telefax (617) 373-294 or Julie Pumphrey, Conference Secretary, The Barnett Institute, Northeastern University, Boston, MA 02115; telephone (617) 373-2868; telefax (617) 373-2855.
Sept. 13 - 18, 1998: 1998 Applied Superconductivity Conference, Marriott's Desert Springs Resort, Palm Desert, CA. Major areas: superconducting materials for a wide range of applications, superconducting electronics, and large-scale applications. For information contact Centennial Conferences, telephone (303) 499-2299; telefax (303) 499-2599; e-mail centennial@orci.com.
Information
Book: High Tc Superconductivity and the C60 Family, edited by Sun-qi Feng and Hai-cang Ren. Provides overview of the high-Tc superconductivity field with both cuprate and fullerene superconductors treated in detail. Superconducting mechanisms based on the marginal Fermi liquid, spin fluctuations, van Hove singularities and on the relevance of Bose-Einstein condensation are discussed. Chapters are based on graduate-level lectures given by internationally-known experts in the field, are self-contained, beginning with introductory background material and culminating in an in-depth discussion of the author's current research. Topics are: spin fluctuation and dx2-y2 pairing in the high-temperature superconductors; charge-transport properties of the cuprate superconductors; photoemission studies of novel superconductors; energy scales of high-Tc cuprates, doped fullerenes, and other exotic superconductors; fullerene superconductors prepared by the mixtures of C60 and alkaline-metal carbonates; transport properties in the superconducting state of the YBa2Cu3O7 system; non-Fermi-liquid state of copper-oxide metals; optical spectra of high-Tc superconductors; Bosonization and high-Tc superconductivity; pairing symmetry and the van Hove model of high-temperature superconductivity in cuprates; defect, inhomogeneity, and lattice mismatch in cuprate superconductors; and properties, research directions, and possible applications of fullerenes. Publ. 1995; 372 pp.; ISBN 2-88449-184-8; price $116.00. Contact the Gordon and Breach Publishing Group, University of Toronto Press, 340 Nagel Drive, Buffalo, NY 14225-4731; telephone (800) 5659523; telefax (716) 683-4557; information also available at the URL http://www.gbhap.com/reader.htm.
Positions Available: A number of postdoctoral positions are available for young theoreticians in the field of condensed-matter physics at the International Institute for Theoretical and Applied Physics, Trieste, Italy. Current research areas of the Theory Group include strongly correlated electron systems, disordered and mesoscopic systems, abinitio electronic structure studies, surface physics, statistical mechanics, and complex systems. Appointments are for one year with possibility of renewal for second term. Application deadline, December 31, 1996. For information, contact Condensed Matter Secretary, ICTP, P.O. Box 586, I-34100 Trieste, Italy; telephone +39 40 2240111; telefax +39 40 224163.
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. Telex: 269266. E-mail: MITRA@AMESLAB.GOV or MITRA@IASTATE.EDU.
Project Director/Editor: Sreeparna Mitra
Science Editor: John R. Clem
High-Tc Update, Vol. 10, #18, September 15, 1996.