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All the high-Tc cuprates contain two-dimensional (2D) CuO2 planes. There has been considerable theoretical and experimental interest, however, in the magnetic properties of materials containing quasi-onedimensional ladders of Cu and O atoms. A preprint by M. Uehara (AoyamaGakuin) et al. now reports superconductivity in the S = 1/2 spin-ladder system Sr0.4Ca13.6Cu24O41.84 under high pressures within a rather narrow pressure range. This layered material consists of a layer containing 1D CuO2 chains, a (Sr,Ca) layer, and a layer containing two-legged Cu2O3 ladders, each ladder consisting of a pair of parallel CuO chains with opposing Cu atoms bridged by O atoms. The onset superconducting transition temperatures observed resistively were 12 K under 3 GPa and 9 K under 4.5 GPa. From magnetization measurements, the authors estimated the superconducting volume fraction to be about 5% under 3.5 GPa at 4.2 K.
RABiTS
A preprint by A. Goyal (Oak Ridge) et al. describes a method for obtaining long lengths of flexible, biaxially oriented substrates with smooth, chemically compatible surfaces for epitaxial growth of hightemperature superconductors. The technique, called RABiTS (rollingassisted biaxially textured substrates), uses well established, industrially scalable thermomechanical processes to impart a strong biaxial texture to a metallic substrate. This is followed by vapor deposition of epitaxial buffer layers (metal and/or ceramic) to obtain chemically compatible surfaces. Epitaxial YBa2Cu3O7-d films (thickness 1 micrometer) grown by laser ablation on such substrates have critical current densities as high as 3 x 10^5 A/cm^2 at 77 K in zero field and have field dependencies similar to those of epitaxial films on singlecrystal ceramic substrates. The authors stress that deposited conductors made using this technique offer a potential route for the fabrication of long lengths of high-Jc tapes capable of carrying high currents in high magnetic fields and at elevated temperatures.
YBa2Cu3O7-d
A preprint by Y. Abulafia (Bar-Ilan) et al. reports local magnetic relaxation measurements in YBa2Cu3O7-d crystals showing evidence for plastic vortex creep associated with the motion of dislocations in the vortex lattice. The authors assert that this creep mechanism governs the vortex dynamics in a wide range of temperatures and fields below the melting line and above the field corresponding to the peak in the fishtail magnetization. In this range the activation energy U_[pl], which decreases with field, drops below the elastic (collective) creep activation energy U_[el], which increases with field. The authors show that the fishtail in YBa2Cu3O7-d is caused by a crossover in flux dynamics from elastic to plastic creep.
A related paper by Y. Abulafia (Bar-Ilan) et al. describes the details of a method for studying thermally activated flux creep in superconductors. The method employs an array of microscopic Hall sensors to probe the time evolution of the field profile in the sample.
Specific-heat measurements by J. P. Emerson et al. (LBNL) on two samples of YBa2Cu3O7-d with relatively low concentrations of paramagnetic centers have revealed the presence of both spin-2 and spin-1/2 moments. Measurements on one sample following incremental increases in d showed that for d <= 0.2 approximately one spin-1/2 moment is produced for each 100 O vacancies, with no substantial increase in the linear term of the specific heat. A related preprint by D. A. Wright et al. (LBNL) reports further measurements on these samples revealing a well-defined H^[1/2]T term in the mixed state but no persuasive evidence for a T^2 term.
As reported by T. W. Clinton et al. (Maryland), measurements of the angular dependence of the vortex transport entropy S_[phi], the ratio of the Nernst and Seebeck effects, and the ratio of the Seebeck effect and resistivity of YBa2Cu3O7-d all can be scaled using the anisotropic effective-mass model with gamma^2 = m_c/m_[ab] = 40. The authors point out that the angular scaling is possible because the effects of pinning drop out of the above quantities, a behavior similar to the pinning independence of the Hall conductivity.
The electronic contribution to the thermal conductivity of a twodimensional d_[x^2-y^2] superconductor with logarithmic van Hove singularities (vHs) in the density of states has been calculated by M. Houssa (Liege) et al. The authors explain the behavior of the thermal conductivity maximum in YBa2Cu3O7-d as a function of oxygen doping in terms of the vHs scenario. They also conclude that this effect is of electronic origin. However, since the experiments near Tc do not distinguish between d-wave and s-wave superconductivity, the authors urge that thermal conductivity measurements be made at very low temperatures.
Ion-channeling measurements of temperature-dependent atomic displacements in YBa2Cu3O7-d are reported by R. P. Sharma (Maryland) et al. The authors report striking differences between superconducting and nonsuperconducting samples.
Bi Cuprates
A preprint by C. D. Keener et al. (Ohio State) presents experimental evidence for nonequilibrium two-stage melting of the vortex lattice in Bi2Sr2CaCu2O8+d (Bi-2212) single crystals. The authors used an eightterminal geometry to investigate vortex correlations along the vortex direction. The authors conclude that there is a range of temperatures T_m < T < T_D corresponding to a line-liquid state. The authors found that (a) the vortex-lattice melting temperature T_m is currentdependent, (b) the decoupling temperature T_D is current-independent, and (c) T_m shifts toward T_D as the current is reduced. The authors also note that the true equilibrium location of the melting line cannot be measured in a transport experiment because of its sensitivity to current.
The effects of a low concentration of point-like or correlated (columnar-defect) disorder on the vortex-lattice phase transition in Bi2212 crystals have been investigated by B. Khaykovich (Weizmann Institute) et al. The authors find that weak point disorder preserves the first-order vortex-lattice melting transition and shifts it to lower fields. This shift is accompanied by a corresponding downward shift of the second magnetization peak at lower temperatures. A low density of columnar defects, on the other hand, shifts the first-order transition to higher fields and transforms it into a continuous transition.
Using a combination of high-precision torque and SQUID magnetometry, D. Zech (Zurich) et al. have investigated the irreversibility line of single-crystalline Bi-2212 containing irradiation-induced columnar pins. The authors report that the irreversibility line cannot be identified with a shifted melting line but that it follows the crossover line B_[rb](T) separating the single-vortex strong-pinning regime from the collective weak-pinning regime.
The effects of Co-substitution effects upon the anisotropic transport properties of Bi2Sr2Ca(Cu1-xCox)2O8+d single crystals have been measured by T. Watanabe and A. Matsuda (NTT). By scaling the angular dependence of the in-plane and out-of-plane resistivity and making use of the fluctuation-renormalized Ginzburg-Landau theory of R. Ikeda et al. [J. Phys. Soc. Jpn. 60, 1051 (1991)], the authors found that the anisotropy gamma = xi_[ab]/xi_c increased with Co doping. Using the 2D LawrenceDoniach theory, the authors also conclude that the effective interlayer coupling depends on temperature.
As reported by H. Z. Durusoy et al. (Stanford), Bi-2212/Ag/Pb proximityeffect junctions have been made on both microscopically flat regions of the c-axis face and on the edges of large cleavage steps of singlecrystal Bi-2212. The resistances of the junctions were determined by the Ag/Bi-2212 interface. The crystal-face junctions showed a tunneling-like characteristic and clear evidence for the Bi-2212 energy gap but no detectable Josephson coupling. The step-face junctions showed a linear I-V curve and a well-defined Josephson coupling with an I_cR_n product of about 4 mV. The temperature dependence of the critical current was found to be consistent with that expected from the deGennes-Clarke proximity theory.
The dependence of the critical current Jc on magnetic field B for highquality rolled multifilamentary Bi2Sr2Ca2Cu3O10+d (Bi-2223) tapes has been investigated by S. Fleshler et al. (ASC). The self-field Jc at 77 K of these rolled tapes has reached values up to 4.4 x 10^4 A/cm^2. Progress in achieving these high Jc values is believed to stem from reduction of weak links.
The microstructure of Ag-sheathed (Bi,Pb)2Sr2Ca2Cu3O10+d [(Bi,Pb)-2223] tapes has been quantitatively investigated by H. Suematsu (Tokyo Institute of Technology) et al. using transmission electron microscopy and electron probe microanalysis. The authors found that the volume fraction of second phases decreases as the critical current density of the wire increases.
Magnetic relaxation in polycrystalline Bi2Sr2Ca2Cu3O10+d (Bi-2223) has been studied by S. Moehlecke and Y. Kopelevich (Campinas) in the temperature interval 1.8 K - 30 K for applied magnetic fields 15-25 Oe. The authors observed quantum creep of intergrain Josephson vortices with a tunneling rate S_t ~~ 1.7 x 10^[-3], in good agreement with the theoretical result for S_t in the limit of strong dissipation with the grain size taken as the relevant scale for fluctuations.
Other Cuprates
Eighteen crystals of superconducting Bi-, Hg-, and Tl-based cuprates with Tc > 50 K have been studied by A. Maignan et al. (Caen) to establish relations between pinning properties and anisotropy. Both the irreversibility line (B_[irr] vs. T) and the fishtail line (second-peak B_[sp] vs. T) were found to be sensitive to the thickness d_i of the insulating layers, the lines becoming steeper as d_i is decreased. The measurements also suggest that the values of the anisotropy gamma for Tl2Ba2CuO6+d (Tl-2201) and HgBa2CuO4+d (Hg-1201) are intermediate between those of the n = 2 and n = 3 members of the corresponding series.
A sensitive differential ac technique has been used by A. Carrington (Grenoble) et al. to measure the specific heat of low-Tc single-crystal Tl2Ba2CuO6+d (Tl-2201, Tc ~~ 15 K) in fields up to 7 T applied parallel to the c axis. Previous experiments have shown that, in contrast to high-Tc cuprates where a magnetic field substantially broadens the resistive transition, the field simply shifts the transition in Tl-2201 to lower temperatures, leaving its width unchanged. The present specific-heat measurements, however, show that the superconducting anomaly in Tl-2201 is dramatically reduced in size and broadened by the magnetic field, suggesting the presence of strong thermal fluctuation effects just as in other cuprates.
Single crystals of HgBa2CuO4+d [(Hg,Bi)-1201] have been grown by D. Pelloquin et al. (Caen). The crystals exhibit superconductivity up to 75 K [midpoint Tc = 62 K] with 100% superconducting volume fraction at low temperature. The irreversible magnetization loops were found to exhibit fishtail shapes, which were not present in ceramics.
A preprint by A. Maignan et al. (Caen) reports magnetic measurements on single crystals of HgBa2Ca2Cu3O8+d (Hg-1223). By means of successive annealings, the Tc of the crystals was varied from 105 K for the assynthesized crystals to 133 K for the optimized ones. This Tc variation permitted studies of the effect of doping on both the irreversibility and fishtail lines (B_[irr] and B_[sp] vs. T) deduced from half hysteresis loops.
As reported by Y. Matsumoto (Fukuoka) et al., Ag doping raises the volume fraction of Hg-1223, increases the magnetization hysteresis, and enhances the critical current density of Hg-1223.
A preprint by J. Loehle (ETH-Zurich) et al. reports measurements of the in-plane transport properties of single crystals of the four-layer superconductor HgBa2Ca3Cu4O10+d (Hg-1234) with a transition temperature of 130 K. Measurements of the temperature dependence of the electrical resistivity and the Hall coefficient in the normal state indicate that the crystals are underdoped. The cotangent of the Hall angle was found to exhibit a T^2 dependence. In the mixed state, the Hall resistivity rho_H and the electrical resistivity rho were found to be related via rho_H proportional to rho^n with n = 1.75.
Superconducting samples (Tc up to 117 K) with a nominal composition of (Cu0.5C0.5)Ba2Ca3Cu4Oz have been synthesized by H. Yamauchi (Tokyo Institute of Technology) et al. using a cubic-anvil-type high-pressure apparatus at 5 GPa and 1200-1250^oC with Ag2O as an oxidizing agent. After the synthesis, however, the Ag2O was found to be for the most part non-decomposed, suggesting that the formation of the (Cu1-xCx)Ba2Can1CunO2n+2+x+d phases does not require large quantities of external oxidizing power.
Thin Films
As reported by K. Y. Chen (Arkansas) et al., biaxially aligned YBa2Cu3O7-d thin films have been deposited on amorphous glass substrates with an in-plane-aligned yttria-stabilized zirconia (YSZ) buffer layer prepared by ion-beam-assisted pulsed-laser deposition. The YSZ films deposited at room temperature exhibited (001) orientation, whereas at temperatures higher than 300^oC, YSZ grew with a high degree of (111) orientation. Both the (001) and (111) YSZ films were in-plane-aligned. YBa2Cu3O7-d films deposited using pulsed-laser deposition on biaxially aligned (001) YSZ on glass were highly c-axis-oriented and strongly aboriented [phi-scan widths of YBCO (103) peaks had a 25-degree FWHM]. Zero-resistance critical temperatures Tc of 87 K were routinely achieved, and the self-field critical current densities Jc were in the range of 10^4 A/cm^2. The limitation in Jc was found to be due to tensile-stress-induced microcracks in the YBCO film resulting from the thermal-expansion mismatch between the glass and the YBCO. The results suggest that glass with a better thermal-expansion match to YBCO would lead to higher Jc values.
High-resolution electron microscopy has been used by M. Aindow et al. (Birmingham) to show that for epitaxial YBa2Cu3O7-d thin films on (001) MgO with the 0-degree orientation, the interface between the substrate and deposit is semi-coherent, rather than graphoepitaxial, as proposed previously. The misfit is accommodated by arrays of misfit dislocations with Burgers vectors 1/2 <110>, line directions <110>, and a regular spacing of 3.3 nm.
The temperature-dependent complex conductivity of YBa2Cu3O7-d thin films has been measured by J. C. Booth et al. (Maryland) at several different fixed frequencies in the microwave range. The measurements show that, in the vicinity of Tc, sigma_1(T) has a local maximum, which becomes smaller and broader as the frequency increases.
A preprint by L. Mieville (Geneva) et al. reports an investigation of vortex dynamics in DyBa2Cu3O7-d/(Sr1-xCax)RuO3 multilayers in parallel and perpendicular applied magnetic fields. The authors measured activation energies U for flux motion and determined vortex coupling through either ferromagnetic (SrRuO3) or nonmagnetic (CaRuO3) barriers. Coupled motion of pancake vortices belonging to different DyBa2Cu3O7-d layers occurs for nonmagnetic barriers (CaRuO3) as large as several hundreds of Angstroms. However, in the case of ferromagnetic barriers (SrRuO3), 50 Angstroms was found to be sufficient to decouple the vortices. The authors suggest that ferromagnetism in the SrRuO3 barrier is responsible for such behavior.
A preprint by A. Andreone (Napoli) et al. reports the fabrication of high-quality c-axis-oriented films of YNi2B2C by magnetron sputtering on MgO substrates held at about 800^oC. The films showed a maximum Tc = 15.3 K, Delta-Tc = 0.1 K, room-temperature resistivity rho ~~ 50 microohm-cm, critical current density Jc(4.2K) ~~ 10^5 A/cm^2, and B_[c2](4.2K) ~~ 6 T.
Applications
A preprint by L. Amatuni (Juelich) et al. reports on the ac Josephson effect and frequency-conversion processes in several high-Tc junctions in the millimeter-wave band. Intrinsic radiation up to 140 GHz was directly detected, and a down-conversion mode with internal local oscillator was realized in a high-Tc Josephson junction.
The characteristics of the resistive transition in RBa2Cu3O7-d, where R includes Y, Gd, Eu, and Dy, have been investigated by F. S. Galasso (United Technologies) et al. for applications in transition-edge thinfilm bolometers. The authors point out the desired film properties to optimize the performance of high-Tc infrared bolometer detectors.
A two-dimensional proximity-sensor system has been used by U. Schmitt et al. (Karlsruhe) to study dynamics and magnetic unbalance effects of superconducting magnetic bearings. The authors found that bearing losses and instability can be reduced significantly by shifting the center of gravity of the disk assembly towards the magnetic symmetry axis.
The fabrication of a trapped-field minimagnet, consisting of four melttextured disks of YBa2Cu3O7-d, 2 cm in diameter and 0.8 cm thick, irradiated with 200 MeV protons, is reported by R. Weinstein (TCSUH) et al. The minimagnet was field-cool-activated in an applied field B_A of 10.8 T. This value of B_A was chosen close to the trapped-field goal of B_t > 10 T to avoid cracking under magnetic pressure. The applied field was reduced to zero slowly (70 min) to avoid quenching by the induced electric field. The minimagnet was cooled initially to 45 K and was further cooled during the activation period to 42 K to reduce creep. A trapped field of 10.1 T resulted. A similar minimagnet, consisting of four disks of YBa2Cu3O7-d seeded with U and neutron irradiated to produce isotropic homogeneous fission-fragment damage centers, trapped 3.1 T at 77 K.
Theory
A Green-function formulation for the superconducting state in layered metal-oxide materials has been developed by V. M. Loktev (Kiev) and Yu. G. Pogorelov (Porto), assuming that the concentration of charge carriers is equal to the concentration of randomly located scatterers (charged dopants). The formulation permits the determination of a temperaturevs.-doping phase diagram, showing the transitions between the insulating, metallic, superfluid, and superconducting phases.
A strong-coupling-limit theory of the normal-state hole dynamics in copper-oxide superconductors has been developed by F. Onufrieva et al. (Saclay). The theory is based on the t-t'-J model and a diagrammatic technique for Hubbard operators. The authors analyzed the evolution of the hole dynamics with doping and found that the Fermi surface of the itinerant quasiparticles is small at low doping, with volume proportional to the concentration d of doped holes, but abruptly becomes large at increased doping, with volume proportional to 1+ d. The ground state with the small Fermi surface is unstable to long-range antiferromagnetic ordering, while that with the large Fermi surface has a saddle-point singularity in the density of states close to the Fermi level over an extended range of doping, d = 0.1-0.4.
A preprint by A. I. Buzdin (Bordeaux) and J. P. Brison (Grenoble) presents a theory for the temperature dependence of the upper critical field H_[c2] in 2D layered superconductors taking both the orbital and Pauli limits into account. The authors find a nonuniform Fulde-FerrellLarkin-Ovchinnikov phase, for which H_[c2] has an unusual temperature dependence: For fields exactly parallel to the layers, H_[c2] varies linearly with T as T --> 0. For any other field orientation, provided that the initial slope of the critical field at T = Tc is large, the authors predict at low temperatures the appearance of a multiquanta vortex state, which exhibits an oscillatory temperature dependence of H_[c2]. The authors suggest that such an effect could be observed in low-Tc quasi-2D layered superconductors.
A second preprint by A. I. Buzdin (Bordeaux) and J. P. Brison (Grenoble) discusses the behavior of clean type-II superconductors when H_[c2] is determined mainly by the Pauli limit. The authors find new solutions for the superconducting order parameter at low temperature; these solutions correspond to higher Landau-level functions with an additional modulation along the field. The authors predict a cascade of transitions between different Landau-level solutions as the field or temperature is varied.
The spectrum of quasiparticle excitations in the cores of isolated pancake vortices in clean layered superconductors has been calculated by D. Rainer (Bayreuth) et al. The authors show that both the circular current around the vortex center and any transport current through the vortex core are carried by localized states bound to the core by Andreev scattering. Thus, the physical properties of the core are governed in clean high-kappa superconductors (e.g., the cuprate superconductors) by Andreev bound states and not by normal electrons, as is the case for dirty high-kappa superconductors.
The vortex structure and magnetization in a Ginzburg-Landau model including a mixture of d_[x^2-y^2]-wave and d_[xy]-wave symmetry have been calculated by M.-S. Choi and S.-I. Lee (Pohang). The authors find near the upper critical field that the vortices form a triangular lattice, which is inconsistent with the oblique lattice recently observed in YBa2Cu3O7-d.
The electronic structure of vortices in a type-II superconductor has been analyzed by N. Hayashi et al. (Okayama) using the quasiclassical Eilenberger framework. The authors examined the origin of the sixfold star shape of the local density of states, observed in scanning tunneling microscope (STM) experiments on NbSe2, taking into account three effects: anisotropic pairing, the vortex lattice, and the anisotropic density of states at the Fermi surface. The split parallel rays of this star are well explained in terms of anisotropic s-wave pairing. The results show that the vortex core has a rich internal structure.
Other Activities
Results of electronic Raman scattering in Bi2Sr2CaCu2O8+d (Bi-2212) and Tl2Ba2CuO6+d (Tl-2201) with variations in the oxygen content are reported by C. Kendziora (NRL) et al. Near optimal doping, both materials show gap anisotropy, with 2 Delta/k_BTc values of 7.2 (B_[1g]) vs. 5.8 (A_[1g]) in Tl-2201 and 8.5 (B_[1g]) vs. 6.2 (A_[1g]) in Bi2212. Overdoped samples, however, exhibit an isotropic gap with 2 Delta/k_BTc ranging from 5.2 for Bi-2212 (Tc = 57 K) to 3.9 in Tl-2201 (Tc = 37 K). The authors compare their data with calculations using both d-wave and isotropic s-wave order parameters.
Preprints by D. van der Marel et al. (Groningen) and J. Schuetzmann (Groningen) et al. report the use of infrared spectroscopy at grazing angle of incidence to study the electrodynamic properties of high-Tc properties. Using p-polarized light (electric field polarized parallel to the plane of incidence and normal to the CuO2 planes), the authors were able to extract the c-axis optical properties in the normal and superconducting states of Tl2Ba2CuO6+d (Tl-2201), Bi2Sr2CuO6 (Bi-2201), and Nd1.85Ce0.15CuO4 (NCCO).
Nonmonotonic voltage-noise spectra have been observed by V. D. Ashkenazy (Bar-Ilan) et al. in granular high-Tc YBa2Cu3O7-d films. The data indicate that high-frequency voltage noise is due to Josephson vortices flowing with a very low viscosity between grains.
Overviews
A review of vortex-lattice melting and dimensional crossover in Bi2Sr2CaCu2O8+d (Bi-2212) single crystals has been prepared by P. H. Kes (Leiden) et al. The authors discuss experiments by muon-spin rotation, small-angle neutron scattering, Hall-sensor arrays, and transport measurements that show that the vortex lattice undergoes a first-order phase transition along the melting line (83 refs.).
Magnetic neutron-diffraction measurements have been reviewed by J. W. Lynn (NIST-Gaithersburg and Maryland) for two families of superconductors where exchange interactions dominate the energetics of the magnetic system: cuprates containing Pr and the quaternary RNi2B2C borocarbides (45 refs.).
Theses
Computer simulations of the vortex lattice in dirty type-II superconductors are described in the Ph.D. thesis of S. C. Spencer (Imperial). The author used one- and two-dimensional models of repulsively interacting particles that have an attractive interaction with a set of static randomly positioned pinning centers (80 refs.).
Comparative studies of the mixed-state transport characteristics of Bi2Sr2Ca2Cu3O10+d and YBa2Cu3O7-d ceramics after zero-field cooling (ZFC) or field cooling (FC) are reported in the Habana M.S. thesis of J. Lopez-Linares (19 refs.).
Contributed by John R. Clem
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J. Aarts, J.M.E. Geers, E. Brueck, A. A. Golubov, and R. Coehoorn, "On the Interface Transparency of Superconductor/Ferromagnetic Multilayers." Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9506, 2300 RA Leiden, THE NETHERLANDS. 74.50.+r; 74.80.Dm.
Y. Abulafia, A. Shaulov, Y. Wolfus, R. Prozorov, L. Burlachkov, D. Majer, E. Zeldov, V. M. Vinokur, and Y. Yeshurun, "Hall-Array Measurements of Flux Creep Parameters in Y-Ba-Cu-O Crystals." Submitted to the Int. Conf. on Physics and Chem. of Molecular and Oxide Supercond. (MOS '96), Karlsruhe, Germany, Aug. 2-6, 1996; submitted to J. Low Temp. Phys. Institute of Superconductivity, Department of Physics, Bar-Ilan University, 52900 Ramat-Gan, ISRAEL. 74.60.Ge; 74.72.-h.
Y. Abulafia, A. Shaulov, Y. Wolfus, R. Prozorov, L. Burlachkov, Y. Yeshurun, D. Majer, E. Zeldov, H. Wuehl, V. B. Geshkenbein, and V. M. Vinokur, "Plastic Vortex-Creep in YBa2Cu3O7-x Crystals." Submitted to Phys. Rev. Lett. Institute of Superconductivity, Department of Physics, Bar-Ilan University, Ramat-Gan 52900, ISRAEL; preprint also available at supr-con@xxx.lanl.gov (9606003). 74.60.Ge; 74.72.Bk.
M. Aindow, D. J. Norris, and T. T. Cheng, "Misfit Dislocations in LaserAblated Heteroepitaxial YBa2Cu3O7-d on (001) MgO." To be published in Phil. Mag. Lett. School of Metallurgy and Materials, University of Birmingham, Edgbaston, Birmingham B15, 2TT, UNITED KINGDOM; telephone +44 121 414 5188; telefax +44 121 414 5232; e-mail m.aindow@bham.ac.uk.
Levon Amatuni, Victor N. Glyantsev, Klaus Herrmann, Alexander M. Klushin, Oliver Harnack, Stephan Beuven, and Marian Darula, "Intrinsic Emission and Mixing Processes in High-Tc Josephson Junctions." Submitted to the Proc. of the XXI Int. Conf. on Low Temperature Physics (LT21), Prague, Czech Republic, Aug. 8-14, 1996. Institute of Thin Films & Ion Technology (ISI), Research Center KFA Juelich GmbH, D-52425 Juelich, GERMANY; +49 2461 612348; telefax +49 2461 612940; e-mail levon@isitell.isi.kfa-juelich.de.
A. Andreone, F. Fontana, M. Iavarone, M. Salluzzo, and R. Vaglio, "ReNi2B2C Superconducting Borocarbides: 'In Situ' Growth of Thin Films, Transport and Tunneling Properties." To be presented at the Int. Conf. on Physics and Chem. of Molecular and Oxide Supercond. (MOS '96), Karlsruhe, Germany, Aug. 2-6, 1996. Istituto Nazionale per la Fisica della Materia (INFM), Dipartimento di Scienze Fisiche, Universita di Napoli "Federico II", Piazzale V. Tecchio 80, I-80125 Napoli, ITALY; telephone +39 81 7682420; telefax +39 81 2391821; e-mail andreone@mvxna2.dsfing.unina.it or andreone@axpna1.na.infn.it. 74.72.Ny; 74.25.Fy; 74.80.Fp.
Bartlomiej Andrzejewski and Jan Stankowski, "Microwave Measurements of the Critical Fields and Currents in HTS." Submitted to the Proc. of the XXI Int. Conf. on Low Temperature Physics (LT21), Prague, Czech Republic, Aug. 8-14, 1996. Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, PL-60179 Poznan, POLAND; telephone +48 61 612-300; telefax +48 61 684-524.
V. D. Ashkenazy, M. Bonaldi, G. Jung, B. Ya. Shapiro, and S. Vitale, "Non-Monotonic High Frequency Flux-Flow Noise Spectra in High-Tc Superconductors." To be published in Solid State Commun. (in press). Department of Physics, Bar-Ilan University, 52100 Ramat-Gan, ISRAEL. Key words: high-Tc superconductors, thin films, noise, flux pinning and creep.
Vilyam Askhenzy, Corrado Coccorese, Grzegorz Jung, Bonaventura Savo, and Boris Ya. Shapiro, "Random Telegraph Voltages in High-Tc Thin Films at Zero Magnetic Field." Submitted to the XXI Int. Conf. on Low Temperature Phys. (LT21), Prague, Czech Republic, Aug. 8-14, 1996. Department of Physics, Bar-Ilan University, 52900 Ramat Gan, ISRAEL.
E. D. Bauer, F. Bridges, C. H. Booth, J. B. Boyce, T. Claeson, G. Brorsson, and Y. Suzuki, "Local Structure Study About Co in YBa2(Cu1xCox)3O7-d Thin Films Using Polarized XAFS." Submitted to Phys. Rev. B. Department of Physics, University of California, Santa Cruz, CA 95064. 61.10.Ht; 78.70.Dm; 74.72.Jt; 74.72.Bk.
P. Berghuis, F. Baudenbacher, R. Herzog, R. E. Somekh, A. M. Campbell, J. E. Evetts, and G. Wirth, "Enhancement of Creep Activation Barriers in Y1Ba2Cu3O7-d Films After Heavy Ion Irradiation." Submitted to the Proc. of the Eighth Int. Workshop on Critical Currents in Supercond., (8th IWCC), Kitakyushu, Japan, May 27-29, 1996. Department of Materials Science and Metallurgy & IRC in Superconductivity, Pembroke Street, CB2 3QZ Cambridge, UNITED KINGDOM; e-mail pb10020@cam.ac.uk.
P. Berghuis, G. A. Wagner, S. C. Fan, and J. E. Evetts, "Surface Morphology and Critical Currents of Vicinal Y1Ba2Cu3O7-d Films." Submitted to Proc. of Eighth Int. Workshop on Critical Currents in Superconductors, (8th IWCC), Kitakyushu, Japan, May 27-29, 1996. Department of Materials Science and Metallurgy and IRC in Superconductivity, Pembroke Street, Cambridge CB2 3QZ, UNITED KINGDOM; e-mail pb10020@cam.ac.uk.
Howard A. Blackstead, John D. Dow, and David B. Pulling, "Hole Superconductivity in Nd2-zCezCuO4." To be published in Superlatt. Microstruct. 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: NdCuO4, electron superconductivity. 74.20.Fg; 74.70.Vy.
James C. Booth, Dong Ho Wu, and Steven M. Anlage, "Temperature Dependence of the Microwave Conductivity Near Tc in YBa2Cu3O7-d Thin Films." To be presented at the XXI Int. Conf. on Low Temp. Phys. (LT21), Prague, Czech Republic, Aug. 8-14, 1996; to be published in Czechoslovak J. of Phys. Contact Steven Anlage, Center for Superconductivity Research, Department of Physics, University of Maryland, College, Park, MD 20742-4111; telephone (301) 405-7321; telefax (301) 405-3779; e-mail anlage@squid.umd.edu. Key words: fluctuations, conductivity, superconductors, frequency dependence, microwave properties, YBa2Cu3O7-d, thin films.
A. I. Buzdin and J. P. Brison, "New Solutions for the Superconducting Order Parameter in High Magnetic Field." To be published in Phys. Lett. A (in press). Laboratoire de Physique Theorique, University Bordeaux 1, Rue du Solarium, F-33174 Gradignan Cedex, FRANCE; telephone +33 56 89 17 54; telefax +33 56 89 87 59; e-mail buzdin@bortibm1.in2p3.fr.
A. I. Buzdin and J. P. Brison, "Non-Uniform State in 2D Superconductors." To be published in Europhys. Lett. (in press). Laboratoire de Physique Theorique, University Bordeaux 1, Rue du Solarium, F-33174 Gradignan Cedex, FRANCE; telephone +33 56 89 17 54; telefax +33 56 89 87 59; e-mail buzdin@bortibm1.in2p3.fr. 74.60.Ec; 74.80.Dm.
L. X. Cao, Y. Xu, B. R. Zhao, T. Yang, Y. Zhu, D. F. Zhang, J. H. Zhao, Y. F. Fu, X. J. Li, B. Xu, Y. Z. Zhang, F. Wu, B. Yin, S. Q. Guo, J. W. Li, S. L. Jia, J. H. Jiang, and L. Li, "Superconductivity and Ferroelectricity of Pb(Zr,Ti)O3/YBa2Cu3O7 Integrated Films." To be published in Physica C (in press). Contact L. Li, National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, PEOPLE'S REPUBLIC OF CHINA. Key words: superconductivity, ferroelectricity, integrate film.
A. Carrington, A. P. Mackenzie, and A. Tyler, "Specific Heat of Low-Tc Tl2Ba2CuO6+d." To be published in Phys. Rev. B (Aug. 1, 1996). Loomis Laboratory of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, IL 61801; telephone (217) 244-4589; telefax (217) 333-9819; e-mail tonyc@alecto.physics.uiuc.edu. 74.72.Fq; 74.25.Bt.
G. C. Che, B. Yin, S. L. Jia, S. Q. Guo, H. Chen, F. Wu, C. Dong, and Z. X. Zhao, "Preparation and Superconductivity of Co-Doped Superconductor Nd2-x-yCaxCeyCuO4 with T'-Structure." To be published in Physica C. Institute of Physics, Chinese Academy of Sciences, National Laboratory for Superconductivity, Beijing 100080, PEOPLE'S REPUBLIC OF CHINA.
K. Y. Chen, G. J. Salamo, S. Afonso, X. L. Xu, Y. Q. Tang, Q. Xiong, F. T. Chan, and L. W. Schaper, "Fabrication of Biaxially Aligned YBa2Cu3O7x Thin Films on Glass Substrates." To be published in Physica C. Department of Physics, High Density Electronics Center, University of Arkansas, Fayetteville, AR 72701.
J. H. Cho, M. P. Maley, H. Safar, J. Y. Coulter, and L. N. Bulaevskii, "Role of Superconducting Fluctuations in c-Axis Transport of Bi-2:2:1:2 Superconductor in High Magnetic Fields." To be published in Physica C (in press). Los Alamos National Laboratory, Los Alamos, NM 87545.
Mahn-Soo Choi and Sung-Ik Lee, "The Effects of d_[x^2-y^2]-d_[xy] Mixing on Vortex Structures and Magnetization." Department of Physics, Pohang University of Science and Technology, Pohang 790-784, SOUTH KOREA. 74.20.De; 74.60.-w; 74.60.Ec.
T. W. Clinton, Wu Liu, X. Jiang, A. W. Smith, M. Rajeswari, R. L. Greene, and C. J. Lobb, "Pinning and the Mixed-State Thermomagnetic Transport Properties of YBCO. " Department of Physics, Center for Superconductivity Research, University of Maryland, College Park, MD 20742. 74.25.Fy; 74.60.-w; 74.60.Ge.
N. R. Dilley, J. Herrmann, S. H. Han, M. B. Maple, S. Spagna, J. Diederichs, and R. E. Sager, "Anomalous Electrical Resistivity in the Superconducting State of CeRu2." To be published in Physica C (in press). Contact M. B. Maple, Institute for Pure and Applied Physical Sciences, University of California at San Diego, La Jolla, CA 920930360; telefax (619) 534-1241.
S. Dorbolo, M. Houssa, and M. Ausloos, "Influence of a van Hove Singularity on the Electronic Specific Heat of High-Tc Superconductors." To be published in Physica C. S.U.P.R.A.S., Institut de Physique B5, Universite de Liege, B-4000 Liege, BELGIUM; e-mail dorbolo@gw.unipc.ulg.ac.be. Key words: specific heat, van Hove singularity, gap parameter symmetry.
H. Z. Durusoy, D. Lew, L. Lombardo, A. Kapitulnik, T. H. Geballe, and M. R. Beasley, "Proximity Junctions on Bi2Sr2CaCu2O8 Single Crystals." To be published in Physica C (in press). Department of Applied Physics, Stanford University, Stanford, CA 94305. 74.50.+r; 74.60.Jg; 74.80.Fp.
J. P. Emerson, D. A. Wright, B. F. Woodfield, J. E. Gordon, R. A. Fisher, and N. E. Phillips, "Dependence of the Low-Temperature Specific Heat of YBa2Cu3O7-d on d and Magnetic Field: Concentrations of Spin-2 and Spin-1/2 Paramagnetic Centers." Submitted to the Int. Conf. on Physics and Chemistry of Molecular and Oxide Superconductors (MOS'96), Karlsruhe, Germany, Aug. 2-6, 1996. Contact R. A. Fisher, Low Temperature Laboratory, Department of Chemistry, University of California, Berkeley, CA 94720. 74.25.Bt; 74.25.Ha.
S. Fleshler, Q. Li, R. D. Parrella, P. J. Walsh, W. J. Michels, G. N. Riley, Jr., W. L. Carter, and B. Kunz, "Critical Current Densities of High Performance Bi-Based Superconducting Composite Wires in Magnetic Field." Submitted to the Eighth Int. Workshop on Critical Currents in Supercond., (8th IWCC), Kitakyushu, Japan, May 27-29, 1996. American Superconductor Corporation, Two Technology Drive, Westborough, MA 01581; e-mail sfleshl@asc.mhs.compuserve.com.
Steven Fleshler, "ac Power Loss of Bi-2223 Tapes in Self-Field." Submitted to the 16th Int. Cryogenic Eng. Conf. and the Int. Cryogenic Mater. Conf. (ICEC 16/ICMC), Kitakyushu, Japan, May 20-24, 1996. American Superconductor Corporation, Two Technology Drive, Westborough, MA 01581; e-mail sfleshl@asc.mhs.compuserve.com.
F. S. Galasso, D. B. Fenner, L. Lynds, C. E. Rossman, D. M. Potrepka, J. I. Budnick, and L. G. Carreiro, "An Assessment of Synthesis Effects on the High-Tc Superconducting Transition: With Application to Thin-Film Bolometer Devices." To be published in Appl. Supercond. Contact D. B. Fenner, Fenner Engineering Associates, 7 Metacom Drive, Simsbury, CT 06070; telephone (860) 651-1250; telefax (860) 651-8306; e-mail dbfenner@aip.org. 74.60.Mj; 81.40.Rs.
A. A. Golubov, F. K. Wilhelm, and A. D. Zaikin, "Coherent Charge Transport in Metallic Proximity Structures." Submitted to Phys. Rev. B. Institute of Thin Films and Ion Technology Research Center Juelich (KFA), D-52425 Juelich, GERMANY; preprint also available at condmat@xxx.lanl.gov (#9605113).
I. K. Gopalakrishnan and J. V. Yakhmi, "Influence of the Structural Anisotropy on the Irreversibility Line of High-Tc Cuprates." Submitted to the Int. Conf. on Physics and Chemistry of Molecular and Oxide Superconductors (MOS'96), Karlsruhe, Germany, Aug. 2-6, 1996; to be published in J. Low Temp. Phys. Chemistry Division, Bhabha Atomic Research Centre, Bombay 400 085, INDIA. 74.25; 74.50.+r; 74.60; 74.72.
A. Goyal, D. P. Norton, J. D. Budai, M. Paranthaman, E. D. Specht, D. M. Kroeger, D. K. Christen, Q. He, B. Saffian, F. A. List, D. F. Lee, P. M. Martin, C. E. Klabunde, E. Hatfield, and V. K. Sikka, "Fabrication of Long Range, Biaxially Textured, High Temperature Superconducting Tape Using a New Technique." Submitted to Appl. Phys. Lett. Superconducting Materials Group, Oak Ridge National Laboratory, P. O. Box 2008, Oak Ridge, TN 37831-6116; telephone (615) 574-1587; telefax (615) 574-7659; e-mail zag@ornl.gov.
M. Grueninger, D. van der Marel, P.J.M. van Bentum, A. Erb, Th. Wolf, and T. Kopp, "Probing the Mid-Infrared Spectrum of YBa2Cu3O6.0 with High Magnetic Fields and Zinc Doping." Submitted to the Proc. of the XXI Int. Conf. on Low Temperature Phys. (LT21), Prague, Czech Republic, Aug. 8-14, 1996. Laboratory of Solid State Physics, University of Groningen, 9747 AG Groningen, THE NETHERLANDS.
B. C. Gupta and K. K. Nanda, "Specific Heat of High-Temperature Superconductors: Role of |psi|^4 Term in the Ginzburg-Landau Free Energy." To be published in Physica C (in press). Contact K. K. Nanda, Institute of Physics, Bhubaneswar-751005, INDIA; e-mail nanda@iopb.ernet.in. Key words: Ginzburg-Landau theory, specific heat in magnetic fields. 74.25.Bt; 64.60.Fr; 74.20.De.
Nobuhiko Hayashi, Masanori Ichioka, and Kazushige Machida, "Star-Shaped Local Density of States Around Vortices in a Type II Superconductor." Department of Physics, Okayama University, Okayama 700, JAPAN; telephone +81 862 52 1111; telefax +81 862 52 7595; e-mail hayashi@mp.okayamau.ac.jp; preprint also available at supr-con@xxx.lanl.gov (#9606002). Key words: vortex-core structure, vortex lattice, local density of states, NbSe2, STM, quasiclassical Eilenberger theory. 74.60.-w; 74.60.Ec.
W. Henderson, E. Y. Andrei, M. J. Higgins, and S. Bhattacharya, "Metastability and Glassy Behavior of a Driven Flux-Line Lattice." Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08855. 74.60.Ge; 74.60.Jg; 74.60.Ec.
H. Hochmuth and M. Lorenz, "Side-Selective and Non-Destructive Determination of the Critical Current Density of Double-Sided Superconducting Thin Films." To be published in Physica C (in press). Institut fuer Experimentalphysik II, Universitaet Leipzig, Linnestrasse 5, D-04103 Leipzig, GERMANY; telefax +49 341 97 32 698; e-mail hochmuth@server1.rz.uni-leipzig.de.
M. Houssa, M. Ausloos, and K. Durczewski, "Influence of van Hove Singularities on the Thermal Conductivity of High-Tc Superconductors." To be published in Phys. Rev. B. S.U.P.R.A.S., Institut de Physique B5, University of Liege, B-4000 Liege, BELGIUM. 74.25.Fy; 74.72.Bk; 74.62.Dh.
T. Ishida, K. Okuda, K. Hirata, H. P. Lang, and H.-J. Guentherodt, "Matching Effect Between the Density of Screw Dislocations and the Break Field in the Irreversibility Lines of YBa2Cu3O7-d Films." To be published in Physica C (in press). Department of Physics and Electronics, Osaka Prefecture University, 1-1 Gakuen-cho, Sakai, Osaka 593, JAPAN.
G. Jackeli and G. Japaridze, "Renormalization Group Approach to the OneDimensional 1/4-Filled Hubbard Model With Alternating On-Site Interactions." Preprint #E17-96-13. Joint Institute for Nuclear Research, Dubna H.P.O. Box 79, 101000 Moscow, RUSSIA.
Masatsune Kato, Atsushi Sakuma, Takashi Noji, and Yoji Koike, "Synthesis of the Pb-Based Superconductor of the Pb3201 Phase (Pb2Cu)Sr0.9La1.1CuO6+d by the Modified Polymerized Complex Method." To be published in Physica C (in press). Department of Applied Physics, Faculty of Engineering, Tohoku University, Aramaki Aoba, Aoba-ku, Sendai 980-77, JAPAN; telefax +81 22 263 9836; e-mail mkato@mlab.apph.tohoku.ac.jp. Key words: (Pb2Cu)Sr0.9La1.1CuO6+d, polymerized complex method, gel, Pb3201 phase, synthesis.
C. D. Keener, M. L. Trawick, S. M. Ammirata, S. E. Hebboul, and J. C. Garland, "Nonequilibrium Vortex Melting in Bi2Sr2CaCu2O8+d Crystals." Department of Physics, Ohio State University, Columbus, OH 43210. 74.25.Dw; 74.25.Fy; 74.60.Ge; 74.72.Hs.
C. Kendziora, R. J. Kelley, and M. Onellion, "Superconducting Gap Anisotropy vs. Doping Level in High-Tc Cuprates." To be published in Phys. Rev. Lett. Code 6650, Naval Research Laboratory, Washington, DC 20375. 74.25.Gz; 74.72.Hs; 74.62.Dh; 78.30.Er.
P. H. Kes, H. Pastoriza, T. W. Li, R. Cubitt, E. M. Forgan, S. L. Lee, M. Konczykowski, B. Khaykovich, D. Majer, D. T. Fuchs, and E. Zeldov, "Flux Lattice Melting and Dimensional Crossover in Bi-2212 Single Crystals." To be published in J. Schegdev Memorial Vol. of J. de Physique. Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9506, 2300 RA Leiden, THE NETHERLANDS.
A. Kharlanov and J. P. Attfield, "Synthesis, Crystal Structure and Properties of In-Containing 1212-type Compounds." To be published in Physica C (in press). IRC in Superconductivity, University of Cambridge, Madingley Road, Cambridge CB3 0NS, UNITED KINGDOM.
B. Khaykovich, M. Konczykowski, E. Zeldov, R. A. Doyle, P. H. Kes, D. Majer, and T. W. Li, "Influence of Weak Disorder on Vortex-Lattice Phase Transitions in Bi2Sr2CaCu2O8." Department of Condensed Matter Physics, Weizmann Institute of Science, 76100 Rehovot, ISRAEL. 74.60.Ec; 74.60.Ge; 74.60.Jg; 74.72.Hs.
Y. Kopelevich and S. Moehlecke, "Paramagnetic Contribution to the Reversible Magnetization of Nb3Pt." Submitted to the XXI Int. Conf. on Low Temp. Phys. (LT21), Prague, Czech Republic, Aug. 8-14, 1996. Instituto de Fisica "Gleb Wataghin," Universidade Estadual de Campinas, Unicamp 13083-970, Campinas, Sao Paulo, BRAZIL; e-mail kopel@ifi.unicamp.br.
C. Kwon, Qi Li, I. Takeuchi, P. A. Warburton, C. Doughty, S. N. Mao, X. X. Xi, and T. Venkatesan, "Superconducting Properties of Ultra-Thin YBa2Cu3O7 Layers in (PrxY1-x) Ba2Cu3O7/YBa2Cu3O7/(PrxY1-x)Ba2Cu3O7 Trilayer Structures." To be published in Physica C (in press). Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, MD 20742; telefax (301) 314-9541; e-mail chuhee@squid.umd.edu. 74.76.Bz; 74.72.Bk; 74.25.Fy.
W. H. Lee, H. K. Zeng, Y. D. Yao, and Y. Y. Chen, "Superconductivity in the Ni-Based Ternary Carbide LaNiC2." To be published in Physica C (in press). Department of Physics, National Chung Cheng University, MingHsiung, Chia-Yi 621, Taiwan, REPUBLIC OF CHINA.
F. Letouze, M. Huve, C. Martin, A. Maignan, C. Michel, M. Hervieu, and B. Raveau, "Introduction of Lanthanide on the Mercury Site of the HgBa2CuO4 Superconductor." To be published in Mater. Res. Bull. Laboratoire CRISMAT, ISMRA et Universite de Caen, URA 1318, Bd. du Marechal Juin, F-14050 Caen Cedex, FRANCE; e-mail martin@crismat.ismra.fr. Key words: layered compounds, oxides, electron microscopy, x-ray diffraction, superconductivity.
Y. H. Li, A. E. Staton-Bevan, Z. Trajanovic, I. Takeuchi, and T. Venkatesan, "Microstructural Investigation of the Growth of YBa2Cu3O7x/Nd2CuO4/YBa2Cu3O7-x Trilayered Films on LaSrGaO4 Substrates." To be published in Physica C (in press). Department of Materials, Imperial College, London SW7 2BP, UNITED KINGDOM.
Juan Lopez-Linares, "Comparative Study of Some Transport Properties in Zero Field Cooling and Field Cooling Condition in YBCO and BSCCO Superconductors." Submitted as a Masters thesis (Facultad de Fisica, Universidad de La Habana). Lab. de Superconductividad, IMRE, Facultad de Fisica, Universidad de La Habana, Vedado 10400, Ciudad Habana, CUBA.
S. E. Lofland, S. D. Tyagi, S. M. Bhagat, M. Rajeswari, T. Venkatesan, D. Kanjilal, and G. K. Mehta, "Microwave Magnetoabsorption in c-AxisOriented YBa2Cu3O7 Films with Columnar Defects." To be published in Physica C. Department of Physics, University of Maryland, College Park, MD 20742-4111. Key words: microwave absorption, flux pinning, thin films, irradiation effect.
J. Loehle, J. Karpinski, P. Wachter, and A. Morawski, "Electrical Resistivity and Hall Effect of Single Crystal HgBa2Ca3Cu4O10+d." To be published in Physica C (in press). Laboratorium fuer Festkoerperphysik, ETH-Zurich, CH-8093 Zurich, SWITZERLAND; telefax +41 1 633 10 77.
V. M. Loktev and Yu. G. Pogorelov, "Metallization and Superconductivity in Doped Metal-Oxide Layered Compounds." N. N. Bogolyubov Institute for Theoretical Physics, National Academy of Sciences of Ukraine, Metrologicheskaya Str. 14-b, 252143 Kiev-143, UKRAINE. Key words: Bose condensation, Cu-O planes, electron-doped superconductor, impurity scattering.
J. W. Lynn, "Rare Earth Magnetic Ordering in Exchange-Coupled Superconductors." Submitted to J. Alloy & Compounds. Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, MD 20742-4111; telephone (301) 405-6152; telefax (301) 314-9541; e-mail jl70@umail.umd.edu.
Atsutaka Maeda, Tetsuo Hanaguri, Yoichi Iino, Sohichiroh Masuoka, Yasutoshi Kokata, Jun-ichi Shimoyama, Kohji Kishio, Hideo Asaoka, Yoshitaka Matsushita, Masashi Hasegawa, and Humihiko Takei, "Nonlinear Meissner Effect in Double-Layered High-Tc Cuprates Investigated by Measurement of the Penetration Depth." Department of Basic Science, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153, JAPAN. Key words: nonlinear Meissner effect, penetration depth, high-Tc cuprate, magnetic-field dependence, YBa2Cu3Oy, Bi2Sr2CaCu2Oy, TI2Ba2CaCu2Oy, anisotropic superconductor.
A. Maignan, S. N. Putilin, V. Hardy, Ch. Simon, and B. Raveau, "Magnetic Study of HgBa2Ca2Cu3O8+d Single Crystals: Effect of Doping on the Irreversibility and Fishtail Lines." To be published in Physica C. Laboratoire CRISMAT, URA CNRS 1318, ISMRA, Bd. du Marechal Juin, F-14050 Caen Cedex, FRANCE; e-mail physol@crismat.ismra.fr.
Antoine Maignan, Vincent Hardy, Christine Martin, Denis Pelloquin, Gaelle Villard, and Alexandre Wahl, "On the Role of Anisotropy in Superconducting Cuprates: A Complete Study of Bi, Hg, Tl-Single Crystals." Submitted to the Proc. of the Int. Conf. on Phys. and Chem. of Molecular and Oxide Supercond. (MOS'96), Karlsruhe, Germany, August 2-6, 1996. Laboratoire CRISMAT, ISMRA, URA 1318, Bd. du Marechal Juin, F-14050 Caen Cedex, FRANCE; e-mail physol@crismat.ismra.fr. 74.30.Ci; 74.60.Ge; 74.70.Vy.
W. Markowitsch, C. Stockinger, W. Goeb, W. Lang, W. Kula, and Roman Sobolewski, "Dynamics of Photodoping and Photoconductivity Relaxation in Oxygen-Deficient YBa2Cu3Ox." To be published in Physica C (in press). Ludwig Boltzmann Institut fuer Festkoerperphysik, Kopernikusgasse 15, A1060 Wien, AUSTRIA; telefax +43 1 586 3408-13; e-mail wilhelm.markowitsch@univie.ac.at.
Yasukuni Matsumoto, Tomoo Tashiro, Tadahiro Akune, and Nobuyoshi Sakamoto, "Ag Doping Effect on Critical Current Density in HgBa2Ca2Cu3Re0.1Od." Submitted to the Proc. of the XXI Int. Conf. on Low Temperature Phys. (LT21), Prague, Czech Republic, Aug. 8-14, 1996; to be published in the Czechoslovak J. Phys., Vol. 46. Department of Electrical Engineering, Fukuoka University, 8-19-1 Nanakuma, Fukuoka 814-01, JAPAN.
L. Mieville, E. Koller, J.-M. Triscone, M. Decroux, O. Fischer, and E. J. Williams, "Vortex Lattice Dynamics in DyBa2Cu3O7/(Sr1-xCax)RuO3 Multilayers." To be published in Phys. Rev. B. Departement de Physique de la Matiere Condensee, University of Geneva, 24 Quai E.-Ansermet, CH1211 Geneva 4, SWITZERLAND. 74.60.Ge; 74.76.-w; 75.70.-i.
L. Miu and S. Popa, "Origin of the Finite Critical-Current Density of Highly Anisotropic Bi2Sr2Ca2Cu3Ox/Ag Tapes in Zero External Magnetic Field." To be published in Physica C (in press). Institute of Physics and Technology of Materials, P.O. Box MG-7, Bucarest, ROMANIA.
S. Moehlecke and Y. Kopelevich, "H-T Phase Diagram of Nb-O Solid Solution." Submitted to the XXI Int. Conf. on Low Temp. Phys. (LT21), Prague, Czech Republic, Aug. 8-14, 1996. Instituto de Fisica "Gleb Wataghin," Universidade Estadual de Campinas, Unicamp 13083-970, Campinas, Sao Paulo, BRAZIL; e-mail sergio@ifi.unicamp.br.
S. Moehlecke and Y. Kopelevich, "Quantum Creep of Josephson Intergrain Vortices in Bi2Sr2Ca2Cu3O10." Submitted to the Weak Supercond. Symp. (WSS'96), Smolenice, Slovak Republic, August 4-7, 1996; to be published in J. Low Temp. Phys. Instituto de Fisica "Gleb Wataghin," Universidade Estadual de Campinas, Unicamp 13083-970, Campinas, Sao Paulo, BRAZIL; email sergio@ifi.unicamp.br. 74.60.Ge; 74.80.Bj; 74.72.Hs.
E. L. Nagaev and A. I. Podel'shchikov, "The Role of the Coulomb Interaction and Lattice Deformation in Magnetic-Impurity Phase Separation." To be published in Physica C (in press). Institute for High Pressure Physics, Troitsk, Moscow Region 142092, RUSSIA; telefax +7 095 3340012; e-mail tsir@elch.chem.msu.su.
T. Nagano, T. Hashimoto, and J. Yoshida, "a-Axis Oriented YBa2Cu3Oy Thin Films Grown on Novel Buffer Layers." To be published in Physica C (in press). Advanced Research Laboratory, Toshiba Corporation, 1 Komukai Toshiba-cho, Saiwai-ku, Kawasaki 210, JAPAN; telefax +81 44 520 1801.
F. Onufrieva, S. Petit, and Y. Sidis, "Hole-Doped Cuprates from Small to Large Fermi Surface." To be published in Physica C (in press). Laboratoire Leon Brillouin, CE-Saclay, F-91191 Gif-sur-Yvette, FRANCE; telefax +33 1 69 08 82 61; e-mail onufri@bali.saclay.cea.fr.
T. E. Oskina, Ya. G. Ponomarev, H. Piel, Yu. D. Tretyakov, and B. Lehndorff, "Structure and Properties of BSCCO-Whiskers Grown from Amorphous Precursors with Foreign Dopants." To be published in Physica C (in press). Contact B. Lehndorff, Department of Inorganic Chemistry, Moscow State University, Moscow 119899, RUSSIA; telefax +49 202 439 2811.
D. I. Pantelis and G. Pantazopoulos, "Manufacturing and Microstructural Aspects of CO2-Laser Processed YBa2Cu3O7-d Superconductors." To be published in Physica C (in press). Manufacturing Technology Division, Department of Mechanical Engineering, National Technical University of Athens, Athens, GREECE; telefax +30 1 381 3897.
J. L. Parish, "Conductivity with Distributed Transition Temperature in a Dirty Superconductor." To be published in Physica C (in press). Department of Physics, Indiana University at South Bend, South Bend, IN 46634.
D. Pelloquin, A. Maignan, A. Guesdon, V. Hardy, and B. Raveau, "Single Crystal Study of the '1201' Superconductor Hg0.8Bi0.2Ba2CuO4+d." To be published in Physica C, Vol. 265. Laboratoire CRISMAT, URA CNRS 1318, ISMRA, Bd. du Marechal Juin, F-14050 Caen Cedex, FRANCE; e-mail physol@crismat.ismra.fr.
Pedro Pereyra, Jose L. Cardoso, Luis E. Amezcua, and A. Kunold, "Magnetic-Field and Temperature Effects on the Critical Exponents and Tunneling in Polycrystalline Superconductors." To be published in Physica C (in press). Departamento de Ciencias Basicas, UAMAzcapotzalco, Av. S. Pablo 180, C.P. 02200, Mexico D. F., MEXICO; telefax +52 5 393 4831. Key words: critical current exponents, granular superconductivity, weak couplings.
P. K. Pujari, R. A. Gunasekaran, and J. V. Yakhmi, "Positron Annihilation Studies on Tetragonal CaLaBaCu3O6.85 Superconductor." To be published in Phys. Lett. A. Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Bombay-400 085, INDIA. Key words: high-Tc superconductor; positron-annihilation spectroscopy. 74.72.-h; 78.70.Bj.
D. Rainer, J. A. Sauls, and D. Waxman, "The Current Carried by Bound States of a Superconducting Vortex." Submitted to Phys. Rev. B. Physikalisches Institut, Universitaet Bayreuth, D-95440 Bayreuth, GERMANY.
L. Samson-Colonescu, J. Berthon, R. Suryanarayanan, and A. Revcolevschi, "Structural and Superconducting Properties of Sm0.6Pr0.4Ba2-kSrkCu3O7 (0<=k<=1). To be published in Eur. J. Solid State & Inorg. Chem. Contact R. Suryanarayanan, Laboratoire de Chimie des Solides, CNRS, UA446, Bat. 414 Universite de Paris-Sud, F-91405 Orsay, FRANCE; e-mail suryan@isma.isma.u-psud.fr.
U. Schmitt, A. Tonoli, and H. J. Bornemann, "Rotor Dynamics of Superconducting Magnetic Bearings." To be published in J. Appl. Phys. Forschungszentrum Karlsruhe GmbH, INFP, P.O. Box 3640, D-76021 Karlsruhe, GERMANY.
J. Schuetzmann, H. S. Somal, J. van der Eb, D. van der Marel, A. A. Tsvetkov, R. L. Greene, N. Koleshnikov, V. H. Dujin, N. T. Hien, and A. A. Menovsky, "c-Axis Excitations in High-Tc Superconductors Detected by Grazing Incidence Reflectivity Measurements." Submitted to the Proc. of the XXI Int. Conf. on Low Temperature Phys. (LT21), Prague, Czech Republic, Aug. 8-14, 1996. Laboratory of Solid State Physics, University of Groningen, 9747 AG Groningen, THE NETHERLANDS.
V. Sedykh, F. E. Fujita, I. S. Smirnova, B. Zh. Narymbetov, A. V. Dubovitskii, V. Sh. Shekhtman, and A. M. Kokotin, "Mossbauer Study of Modulated Structure of Bi2Sr2CaFe2Oy Phase." To be published in Physica C (in press). Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, 142432 Moscow Region, RUSSIA; telefax +7 96 576 41 11; e-mail sedykh@issp.ac.ru.
M. Sera, S. Kobayash, M. Hiroi, N. Kobayashi, H. Takeya, and K. Kadowaki, "Thermal Conductivity of RNi2B2C (R=Y, Ho) Single Crystals." To be published in Phys. Rev. B. Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Sendai 980-77, JAPAN.
R. P. Sharma, Z. H. Zhang, J. R. Liu, R. K. Chu, T. Venkatesan, and W. K. Chu, "Phonon Anomaly in High Temperature Superconducting YBa2Cu3O7-d Crystals." Preprint #96:070; submitted to the Proc. of the 10th Anniv. Workshop on Phys., Mater., and Appl., Houston, TX, March 12-16, 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.
M. V. Simkin, "Comment on 'Voltage-Current Characteristics of the TwoDimensional Gauge Glass Model.'" Department of Physics, Brown University, Box 1843, Providence, RI 02912-1843; e-mail simkin@barus.physics.brown.edu.
M. V. Simkin, "Current-Induced Chiral Phase Transition in a JosephsonJunction Array." Department of Physics, Brown University, Box 1843, Providence, RI 02912-1843; e-mail simkin@barus.physics.brown.edu; preprint also available at cond-mat@xxx.lanl.gov (#9604180).
M. V. Simkin, "On Mean-Field Theory of Quantum Phase Transition in Granular Superconductors." Department of Physics, Brown University, Box 1843, Providence, RI 02912-1843; e-mail simkin@barus.physics.brown.edu.
A.P.B. Sinha, K. K. Singh, and D. E. Morris, "Location of Calcium in CaSubstituted YBa2Cu4O8, and Impurity Phases in Off-Stoichiometry Compositions." To be published in Physica C (in press). Morris Research, Inc., 1918 University Avenue, Berkeley, CA 94704; telefax (510) 548-5485.
Steven Charles Spencer, "Computer Simulations of Flux Pinning in Type II Superconductors." Submitted as a Ph.D. thesis (Imperial College of Science, Technology and Medicine). Department of Mathematics, Imperial College of Science, Technology and Medicine, 180 Queen's Gate, London SW7 2BZ, UNITED KINGDOM; telephone +44 171 589 5111 x58611; telefax +44 171 594 8517; e-mail s.spencer@ma.ic.ac.uk.
H. Stafast, L. Redlich, T. Koehler, K. Steenbeck, and M. Diegel, "Laser Surface Interaction During and After Deposition of Thin Oxide Films." To be published in App. Surf. Sci. (in press). IPHT Jena, Bereich Angewandte Lasertechniken, P.O. Box 100239, D-07702 Jena, GERMANY; telephone +49 3641 302600; telefax +49 3641 302603; e-mail pkt@rz.unijena.de. Key words: thin film, YBCO, PZT, passivation, noble metal oxides, laser treatment, laser-driven switching, SQUID, characterization, optimization, contacting, overview.
U. Staub, L. Soderholm, S. Skanthakumar, and Mark R. Antonio, "Oxidation State of the Unusual Rare Earth (R=Ce, Pr and Tb) in Double-Layer HighTc Superconductors." Swiss Light Source Project, Paul Scherrer Institute, CH-5232 Villigen PSI, SWITZERLAND.
H. Suematsu, H. Yamauchi, T. Yano, H. Li, and Y. Tanaka, "Microstructure of Ag Sheathed (Bi,Pb)2Sr2Ca2Cu3Ox Tape." Submitted to J. Mater. Sci. Research Laboratory for Engineering Materials, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama 226, JAPAN.
Masatomo Uehara, Takashi Nagata, Jun Akimitsu, Hiroki Takahasi, Nobuo Mori, and Kyoichi Kinoshita, "Superconductivity in the S=1/2 Spin Ladder System Sr0.4Ca13.6Cu24O41.84." Submitted to J. Phys. Soc. Jpn. Department of Physics, Aoyama-Gakuin University, Chitosedai, Setagayaku, Tokyo 157, JAPAN. Key words: superconductivity, ladder system, spin gap, (Sr,Ca)14Cu24O41-d, high-pressure experiment.
S. Uma, W. Schnelle, E. Gmelin, G. Rangarajan, A. Erb, E. Walker, and R. Fluekiger, "Specific Heat of Single Crystalline PrBa2Cu3O7-d in Magnetic Fields." To be presented at the XXI Int. Conf. on Low Temperature Phys. (LT21), Prague, Czech Republic, Aug. 8-14, 1996, to be published in Czechoslovak J. Phys., Vol 46 (1996). Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, GERMANY; telephone +49 711 689 1364; e-mail uma@tilux.mpi-stuttgart.mpg.de.
D. van der Marel, J. Schuetzmann, H. S. Somal, and J. W. van der Eb, "Electrodynamical Properties of High Tc Superconductors Studied with Polarized Angle Resolved Infrared Spectroscopy." To be published in the Proc. of the 10th Anniv. HTS Workshop on Physics, Materials, and Applications, Houston, TX, March 12-16, 1996 (World Sci., Singapore). Solid State Physics Laboratory, University of Groningen, Nijenborgh 4, 9747 AG Groningen, THE NETHERLANDS; telephone +31 50 363-7229 or -4826; telefax +31 50 363 4825; e-mail marel@phys.rug.nl.
T. Watanabe and A. Matsuda, "Evidence of the Temperature Dependent Interlayer Coupling from the Anisotropic Transport Properties in CoSubstituted Single-Crystal Bi2Sr2Ca(Cu1-xCox)2O8+d." To be published in Phys. Rev. B. Nippon Telegraph and Telephone Corporation, NTT Basic Research Laboratories, 3-1 Morinosato, Wakamiya, Atsugi-shi, Kanagawa 243-01, JAPAN; telephone +81 462 40 3561; telefax +81 462 70 2364; watanabe@will. brl.ntt.jp. 74.25.Fy; 74.62.Dh; 74.72.Hs; 74.40.+k.
R. Weinstein, J. Liu, Y. R. Ren, R. P. Sawh, D. Parks, V. Obot, and C. Foster, "Multi-Tesla Quasi-Stable Trapped Field Magnets of HTS: 10.1 T at 42 K and 3.1 T at 77 K." Submitted to Physica C. Texas Center for Superconductivity, University of Houston, Houston, TX 77204-5932; telephone (713) 743-8200; telefax (713) 743-8201; e-mail preprints@www.tcs.uh.edu. Key words: superconducting magnet, flux pinning, irradiation effect, critical current density, flux creep.
D. A. Wright, J. P. Emerson, B. F. Woodfield, S. F. Reklis, J. E. Gordon, R. A. Fisher, and N. E. Phillips, "Dependence of the LowTemperature Specific Heat of YBa2Cu3O7-d on d and Magnetic Field: The H^[1/2]T Term for H not equal to 0; Absence of Evidence for a T^2 Term for H=0." Submitted to the Int. Conf. on Physics and Chemistry of Molecular and Oxide Superconductors (MOS'96), Karlsruhe, Germany, Aug. 2-6, 1996. Contact R. A. Fisher, Department of Chemistry, Low Temperature Laboratory, University of California, Berkeley, CA 94720. 74.25.Bt; 74.25.Ha.
Y. B. Xie, "Localizaton in Highly Anisotropic Systems and Anomalous Resistivity in Cuprate-Oxide Superconductors." To be published in Physica C (in press). Department of Chemical Physics, Univerisity of Science and Technology of China, Hefei, Anhui 230026, PEOPLE'S REPUBLIC OF CHINA.
H. Yamauchi, M. Karppinen, T. Ito, H. Suematsu, and O. Fukunaga, "Oxygen Stability and Thermal Decomposition of Superconducting (Cu,C)Ba2Ca3Cu4Oz Samples." To be published in Physica C (in press). Center for Ceramics Research, Research Laboratory of Engineering Materials, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama 226, JAPAN; telefax +81 45 921 6953; e-mail yamauchi@materia.titech.ac.jp.
D. Zech, S. L. Lee, H. Keller, G. Blatter, P. H. Kes, and T. W. Li, "Phase Diagram of Bi2.15Sr1.85CaCu2O8+d in the Presence of Columnar Defects." To be published in Phys. Rev. B. Ginzton Laboratory, Stanford University, Stanford, CA 94305; e-mail dzech@loki.stanford.edu. 74.60.Ge; 74.72.Hs; 74.62.Dh; 74.40.+k.
July 30, 1996: Japanese Technology Evaluation Center (JTEC) Workshop on Power Applications of High-Temperature Superconductivity, Loew's L'Enfant Plaza, Washington, DC. JTEC panel will present results of their travel in June 1996 to sites in Japan (NEDO, ISTEC, Furukawa Denko, MAGLEV, KEK, and Sumitomo) and Germany (Seimens, Vacumshmeltzer, and Hoecht). Other venues also visited include ABB in Geneva, EDF in France, and Pirelli in Milan. For more information on the workshop, call (410) 617-5001 or e-mail to itri@loyola.edu.
*July 31 - Aug. 1, 1996: USDOE Superconductivity Program for Electric Systems: Annual Peer Review, Loew's L'Enfant Plaza, Washington, DC. Intended for those interested in recent progress made in the federal effort to capture energy advantages of superconductivity. Objectives: to have leading experts review presentations of research results, performance, and proposals for future work; to learn status of major systems projects for development of super-efficient industrial motors, power cables, current limiters, and generators; and to offer a public forum to those wanting information about status of this emerging technology and future research priorities. Meeting is open to the public and will feature concurrent sessions of wire technology projects (BSCCO wires and coils; TBCCO wires and coils; coated conductor technology; bulk technology, new materials, and phase diagrams) and systems technology projects (motors; power cables; current limiters; generators; transformers; magnetic separation, energy storage, and current leads; and others). Registration deadline, July 15, 1996. For further information, contact Jim Daley, Program Manager, Department of Energy, telephone (202) 586-1165; Chris Platt, Program Manager, Department of Energy, telephone (202) 586-8943; or Craig Matzdorf, Energetics, telephone (410) 290-0370.
*Aug. 25 - 30, 1996: The 1996 Applied Superconductivity Conference, Pittsburgh Convention Center, Pittsburgh, PA. Hosted by Westinghouse Science and Technology Center. Major areas: superconducting materials for a wide range of applications, superconducting electronics, and large-scale applications. Celebration luncheon commemorating the 10th anniversary of the discovery of HTS materials will feature distinguished speakers in the field. The 1996 meeting will use both oral and poster formats for invited presentations. Early registration deadline, August 1, 1996. Selected papers to be published in IEEE Transactions on Applied Superconductivity. For information, contact William Shoemaker, Conference Manager, AHI Conference Management, Hudsons Cross Roads, Selbyville, DE 19975; telephone (800) 788-7077; telefax (302) 436-1911; e-mail convene@aol.com. Detailed information available at the WWW site http://www.essd.com/stc/asc/index.htm.
Sept. 30 - Oct. 2, 1996: Swiss Workshop on Superconductivity and Novel Metals: Basic Research and Applications, Les Diablerets, Switzerland. Supported by the Swiss National Science Foundation. Objectives are to bring together researchers in basic and applied superconductivity and related fields, and to act as a forum for promoting research and applications of superconductivity and novel metals. Workshop will also celebrate the 10th anniversary of the discovery of high-temperature superconductivity. Papers are solicited in the following topics: highand low-temperature superconductors; novel metals; materials science and new materials; crystal growth, thin films, and multilayers; spectroscopies; experiments probing the nature of the superconducting state; phenomenology and microscopic theory; flux dynamics, flux pinning, and critical currents; and applications including magnets and electric energy systems, electronics, and microwave applications. Oral and poster sessions. Workshop is open to all scientists, engineers, and students working in the field in Switzerland and a limited number of invited scientists from other countries. Abstract and preregistration deadline, July 22, 1996. For further information, contact Claus Schueler, ABB Konzernforschung, 5405 Baden-Daettwil, Switzerland; telephone +41 56 486 8136; telefax +41 56 493 3662; e-mail claus.schueler@chcrc.abb.ch.
*Feb. 28 - March 4, 1997: Fifth International Conference on Materials and Mechanisms of Superconductivity and High-Temperature Superconductors (M2S-HTSC-V), Beijing, China. Topics include high-Tc materials; physical properties of high-Tc materials; magnetism and superconductivity; vortices, pinning, and flux melting; thin films and multilayers; Josephson junctions; applications; heavy fermions; organic superconductors; fullerenes; and theory. Exhibition of high-Tc superconducting materials, low-temperature experimental appliances, and cryogenic engineering and refrigeration instruments. Conference language is English. Abstract deadline, September 1, 1996. For information, contact D. Jin, M2S-HTSC-V Secretariat, Cryogenic Laboratory, Chinese Academy of Sciences, P.O. Box 2711, Beijing 100 080, People's Republic of China; telephone +86 10 255 1143; telefax +86 10 256 4049; e-mail djin@cl.cryo.ac.cn.
*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.
New Database: Electrotechnical Laboratory (Japan) introduces a new Superconductivity Papers Database at the web site http://www.aist.go.jp/RIODB/sprcnd_etl/. Database includes papers on superconductivity published in 20-50 journals since the discovery of high-Tc superconductivity in 1987. In the field of organic conductors, papers are traced back to TTF-TCNQ. Database contains the following subcategories: 1) high-Tc superconductivity, 2) C60-related materials, 3) organic conductors, 4) non-oxide superconductors including the conventional superconductors, and 5) oxide conductors. Total number of articles to date: 29,000. Although most conference proceedings are excluded from the listing, some important papers (in the organizer's view) from the proceedings are included. This database is supported by ETL (Electrotechnical Laboratory, AIST) and ISTEC (International Superconductivity Technology Center) in Japan. For information, contact evetm@ETL.go.jp or k.murata@ETL.go.jp.
Position Available: A postdoctoral position is available immediately in the Superconducting Technology Program at Oak Ridge National Laboratory (ORNL) for an individual with experience in growth and characterization of thin films by vapor deposition methods including e-beam evaporation, sputtering, and pulsed-laser ablation. Experience in film characterization by XRD, SEM, and TEM desirable. For information, contact A. Goyal, Metals and Ceramics Div., Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6116; telephone (423) 574-1587; telefax (423) 574-7659; e-mail zag@ornl.gov.
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High-Tc Update, Vol. 10, #14, July 15, 1996.