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Vortices

An analytical investigation has been carried out by Y. Mawatari (ETL) for the distributions of electric field and electric charge arising from the Hall effect in superconducting strip lines. Both a longitudinal field E_y(x) (along the strip) and a transverse field E_x(x) (across the strip) are induced by vortex motion via the Hall effect. The author analytically determined by the electric-field distribution using a scaling law, E_x proportional to E_y^m, and then derived the corresponding distribution of sheet charge q(x) using a nonlocal relationship between E_x(x) and q(x). The author points out that the macroscopic charge arises from polarization of moving vortices.

Dislocations in a driven vortex lattice in a two-dimensional superconductor with random impurities have been considered theoretically by I. S. Aranson (Argonne) et al. The authors studied the structure and dynamics of dislocations starting from a coarse-grained equation of motion for the displacement field. The dislocations are found to lead to an anisotropic distortion of the vortex density that is controlled by a Kardar-Parisi-Zhang nonlinearity in the coarse-grained equation of motion. This nonlinearity implies a screening of the interaction between dislocations and thereby an instability of the vortex lattice to proliferation of free dislocations.

A paper by P. Benetatos and M. C. Marchetti (Syracuse) uses non-Gaussian hydrodynamics to study the magnetic response of a flux-line liquid in the mixed state of a type-II superconductor. Using a theory that incorporates the nonlocality of the intervortex interaction in the field direction, the authors focus on the response of the flux array to a transverse tilting field, which is controlled by the tilt modulus c_[44]. The authors find that interaction effects can enhance c_[44] even in infinitely thick clean materials. The enhancement can be interpreted as the appearance of a disentangled flux-liquid fraction.

As reported by L. Krusin-Elbaum (IBM-Yorktown) et al., strong vortex pinning by fission-induced uniformly splayed columnar tracks in anisotropic mercury cuprates has been demonstrated to result from rescaling of the pinning landscape by a large superconducting anisotropy. The effective narrowing of the splay distribution restores variable-range vortex hopping (VRH) expected for nearly parallel pins. VRH emerges as a distinctive peak in the vortex creep rate (~12% at low fields at T/Tc ~ 0.5) of HgBa2Ca2Cu3O8+d (Hg-1223), a peak well described by a glassy dynamics with the characteristic exponent mu ~ 1/3.

Using an extensive scaling analysis of the transport properties in twinned YBa2Cu3O7-d crystals, S. A. Grigera (Bariloche) et al. have found experimentally the predicted change in the universality class of the Bose glass to liquid transition when the magnetic field is applied at small angles relative to the direction of the correlated defects. The new dynamical exponent is s' = 1.1+-0.2.

The scaling behavior of the current-voltage characteristics of chiral and gauge-glass models of disordered two-dimensional superconductors has been studied numerically by E. Granato (Sao Jose dos Campos). For both models, the author found that the linear resistance is nonzero at finite temperatures and that the scaling analysis of the nonlinear resistivity is consistent with a phase transition at T = 0, characterized by a diverging correlation length xi proportional to T^[-nu_T] and thermal critical exponent nu_T. The values of nu_T were found to be different for the chiral and gauge-glass models, suggesting different universality classes, in contrast to the result obtained recently in three dimensions.

High-resolution magnetic-torque studies by M. Willemin (Zurich) et al. on an untwinned YBa2Cu3O7-d single crystal near its critical temperature Tc reveal that the first-order vortex-lattice melting transition (VLMT) persists at least up to 0.5 K below Tc. The associated sharp discontinuity in magnetization is detectable even at temperatures where the torque signal deviates from mean-field behavior due to fluctuations. The magnetic irreversibility below the VLMT can be suppressed by applying a weak transverse ac magnetic field, enabling the irreversibility line to be separated from the melting line near Tc. The authors found that the melting entropy does not show any unusual temperature dependence near Tc as proposed by some theories. Around and below the VLMT, the authors found that the torque signal is characterized by noise, evidently related to the pinning or depinning of vortex bundles, which vanishes in the fluid phase.

The influence of oxygen stoichiometry on the field and temperature dependence of the magnetoresistance of YBa2Cu3O7-d near optimal doping (0.05 < d < 0.09) has been studied in fields up to 23 T by R. M. Langan (Southampton) et al. The authors found that the kink in the resistivity versus temperature, the signature of the first-order vortex-lattice melting transition, disappears when B exceeds the multicritical field B_[mc], and that B_[mc] strongly increases with decreasing d. The authors also demonstrate that variations of the oxygen stoichiometry in the range 0.05 < d < 0.09 do not have a significant effect on the intrinsic parameters (such as anisotropy, coherence length, and penetration depth) but do have a large influence on the degree of vortex-line entanglement.

The developed stage of the helical instability of a vortex line in a thin film has been studied theoretically by Yu. A. Genenko (Goettingen and Donetsk) et al. The instability of a one-dimensional vortex lattice parallel to a thin superconducting film surface and to a transport current is modeled as a transformation of initially straight vortex lines into chains of vortex lines crossing the film and tilted in the field direction. The pitch length of the first unstable spiral-like chain structure is found to be of the order of the film thickness at all fields, and the calculated dissipation rate is found to be comparable in magnitude with that found experimentally.

The field distribution in a thin superconductor in which Jc(B) exhibits a peak at intermediate fields (fish-tail effect) has been calculated by M. Chandran (Indore) using the model of a two-dimensional inductive Josephson-junction array subjected to a perpendicular applied field.

A preprint by J. X. Zhu (TCSUH) et al. reports the microscopic derivation of a set of coupled time-dependent Ginzburg-Landau equations (TDGL) for superconductors of mixed d- and s-wave symmetry from the Gor'kov equations, using the analytic continuation technique and accounting for both nonmagnetic and magnetic scattering effects. The authors find that the d- and s-wave components of the order parameter can have very different relaxation times in the presence of nonmagnetic impurities. They note that this result is contrary to the behavior of a set of phenomenological TDGL equations proposed by other authors.

Theory

A two-dimensional Fermi liquid with a Fermi surface containing the saddle points (pi,0) and (0,pi ) has been studied by N. Furukawa et al. (ETH-Zurich). Including Cooper and Peierls channel contributions leads to a one-loop renormalization group flow to strong coupling for short- range repulsive interactions. In a certain parameter range, the characteristics of the fixed point, the opening of a spin and charge gap, and appearance of pairing correlations are similar to those of a two-leg ladder at half-filling. The authors note that this microscopic model has much in common with the results of ARPES experiments and some recent phenomenological models, and they believe it can form the basis for a theory of the cuprates.

An extensive examination of numerical results and analytical calculations devoted to the study of two holes doped into a two- dimensional square lattice described by the t-J model is reported by A. L. Chernyshev (Queen's) et al. The authors present exact- diagonalization numerical results for the ground state of two holes in a 32-site lattice. Using this exact wave function, the authors calculated various correlation functions, including the electron momentum distribution function (EMDF) and the hole-hole spatial correlation function. Comparing the numerical results with analytical expressions based on the canonical transformation approach to the t-J model, the authors find good agreement for the binding energy, the EMDF for one and two holes, and the hole-hole spatial correlation function.

To investigate flux quantization and superfluid weight in doped antiferromagnets, G. C. Psaltakis (Crete) has used a t-t'-J model to calculate the magnetic-field dependence of the energy of the metallic phase-modulated antiferromagnetic ground state close to half-filling. The author describes the charge carriers in terms of hard-core bosons and argues that the superconducting transition temperature Tc in the cuprates is of the Kosterlitz-Thouless type, signaling phase coherence of the condensate. The theoretical doping dependence of Tc agrees qualitatively with experiment.

Using the model of a singlet-correlated band, M. V. Eremin et al. (Kazan State) have calculated the temperature dependence of d-wave superconducting (SC) and charge-density-wave (CDW) gaps. The temperature interval for which there is SC-CDW coexistence is found to depend strongly on superexchange and Coulomb parameters. At low temperatures superconductivity is found to suppress the CDW state.

Tunneling in ferromagnet/unconventional superconductor (F/S) junctions has been studied by I. Zutic and O. T. Valls (Minnesota). The authors have included the effects of spin polarization, interfacial resistance, and Fermi wavevector mismatch between the F and S regions. Andreev reflection at the F/S interface, which governs tunneling at low bias voltage, is found to be strongly modified by these parameters, and the conductance exhibits a wide variety of features as a function of applied voltage. The authors find that the conductance displays novel behavior, different from that found in unpolarized tunneling into an unconventional superconductor or in a ferromagnet/conventional superconductor junction.

The ground-state properties of the crossover between BCS superconductivity and Bose-Einstein condensation have been calculated by B. C. den Hertog (Waterloo and Canberra) using a model that exhibits d_[x^2-y^2] pairing symmetry. The author compares results for zero temperature with known features of s-wave systems and shows that bosonic degrees of freedom are likely to emerge only in the dilute limit.

A calculation by Y. Tanaka (ETL) et al. predicts a resonance between a phonon of energy omega_0 and a superconducting gap of maximum value 2Delta_[max] when omega_0 ~ 2Delta_[max]. Striking differences in the Raman spectrum are found depending upon whether the superconductor has s-wave or d-wave symmetry. The authors thus propose that the resonance structure opens up a new kind of spectroscopy for probing superconducting pairing symmetry.

To compute an electron-phonon correlation function characterizing the size and shape of the polaron lattice distortion in one, two, and three dimensions, A. H. Romero et al. (UC-San Diego) have applied weak- coupling perturbation theory to the Holstein molecular crystal model. The exactly calculated width of the polaron disagrees in all dimensions with some well-known characterizations of polarons, signaling the breakdown of the adiabatic approximation and self-trapping descriptions.

A preprint by E. L. Haase (Karlsruhe) describes many results following from an extended Ginzburg-Landau theory with two coupled order parameters, one for superconductivity and the other for a structural phase transition. The theory predicts enhancements of the superconducting transition temperature Tc when the structural phase transition is nearby in temperature.

RBa2Cu3O7-d

A Raman study of the variation of the B_[1g] O(2)-O(3) out-of-phase plane-oxygen vibrations in SmBa2Cu3Oy with temperature has been carried out by A. A. Martin (MPI-Stuttgart) et al. This mode shows an anomalously strong hardening of about 10-13 cm^[-1] between 300 K and 10 K for both the nonsuperconducting (y ~~ 6.0) and superconducting (y ~~ 6.9) samples. The authors suggest that the anomalous hardening is due mostly to its coupling to a Sm^[3+] crystal-field transition at 193 cm^[-1] found earlier in inelastic neutron-scattering experiments.

The effects of excess Y2O3 addition on the levitation force of melt- textured YBa2Cu3O7-d (YBCO) have been studied by W. M. Yang (Xi'an, Jena, and Shenyang) et al. The authors found that the melt-reaction temperature decreased and the solid-state-reaction temperature increased with increasing Y2O3 addition. To maximize the levitation force, the optimum Y2O3 addition was found to be about 10 wt%.

Bi Cuprates

As reported by W. G. Wang (Nordic Superconductor Technologies) et al., Ag-sheathed Bi-2223 multifilament tapes with 19, 37, 55, and 85 filaments have been produced by the powder-in-tube method. The authors have achieved enhanced tape performance by optimizing processing conditions. Key factors include eliminating the 2212 phase, improving grain connectivity by reducing 2201 phase and alkaline-earth-cuprate phases, increasing the superconductor core density, and enhancing the current contribution from edge filaments. For example, the authors report a self-field, 77 K Jc of 5 x 10^4 A/cm^2 with I_c = 42 A in a 19- filament tape of dimensions 0.16 x 2.8 mm^2 and silver/superconductor ratio of 4.4 to 1. A pure Ag-sheathed tape of length 1,250 m and a Ag- alloy-sheathed tape of length 1,100 m were produced showing Jc > 2.5 x 10^4 A/cm^2.

A preprint by L. Wu et al. (Brookhaven) reports the crystallographic analysis of three major intermediate phases that occur during the conversion of (Bi,Pb)2Sr2CaCu2O8+d (Bi-2212) to (Bi,Pb)2Sr2Ca2Cu3O10+d (Bi-2223) phase in Ag-sheathed composite tapes. The authors describe the structure and morphology of these phases: (Ca,Sr)5+x(Pb,Bi)3+yCuO, (Ca,Sr)CuO2, and (Ca,Sr)14Cu24O41+d.

Hg Cuprates

Superconducting crystals (Tc = 88 K) of the 1201 mercury cuprate, Hg0.75V0.25Ba2CuO4+d, have been grown and studied by G. Villard et al. (Caen). Vanadium serves to stabilize the 1201 structure.

The out-of-plane (c-axis) resistivity rho_c of HgBa2CuO4+d (Hg-1201) crystals has been measured by G. Villard (Caen) et al. The results support the idea that there is a strong correlation between rho_c and the location of the irreversibility line in the B-T plane.

As reported by A. A. Gapud (Kansas) et al., the superconducting HgBa2Ca2Cu3O8+d (Hg-1223) phase can be formed at temperatures as low as 720^oC by the addition of Li at a level of 0.1 to 0.4 per unit cell, thus effectively lowering the processing temperature by more than 100^oC. The data indicate that Li most likely forms a flux that catalyzes the reaction of constituents and the formation of superconducting domains at low temperatures.

The irreversibility lines of epitaxial thin films of HgBa2CaCu2O6+d (Hg- 1212, Tc = 120-123 K) and TlBa2Ca1Cu2O7 (Tl-1212, Tc = 90-93 K), whether deduced from field-induced magnetoresistive broadening or the onset of nonhysteretic magnetization, have been found by A. A. Gapud (Kansas) et al. to coincide when plotted against reduced temperature. According to the authors, these results indicate that replacing Tl with Hg has no noticeable effect on the anisotropy and suggests that Tc is not determined by anisotropy.

Other Cuprates

Two papers by H. Ito (Tokyo Tech and Tokai) et al. report the effects of oxygen content on high-pressure-synthesized CuBa2Ca2Cu3O8+d (Cu-1223:P) and CuBa2Ca3Cu4O10+d (Cu-1234:P). Since as-synthesized Cu-1223:P (Tc = 67 K) was found to be strongly overdoped, post-annealings in flowing Ar gas were used to remove oxygen and achieve optimal doping. The highest Tc obtained was 118 K for a sample annealed at 400^oC. On the other hand, the amount of excess oxygen in as-synthesized Cu-1234:P was found to be low and quite insensitive to annealing in 1 atm O2 and Ar atmospheres. With extreme-condition treatments at high oxygen pressures, the oxygen content could be increased slightly, but the Tc remained nearly constant at 116-117 K over the entire range 0.09 <= d <= 0.35.

Films

The microstructure of La1.9Sr0.1CuO4 thin films grown by molecular beam epitaxy (MBE) on SrLaAlO4 (SLAO) and SrTiO3 (STO) has been investigated by J. W. Seo (Neuchatel and IBM-Zurich) et al. using transmission electron microscopy. The authors report that applying a compressive or tensile strain increases or decreases the distance between CuO2 planes. The authors present evidence that a decoupling of CuO2 planes is associated with an increase of Tc, which is in contradiction to recent theoretical predictions. A related paper by J. Perret (Neuchatel and IBM-Zurich) et al. presents an analysis of the uniaxial strain or pressure derivatives of Tc in cuprate superconductors leading to a prediction that under a compressive epitaxial strain, a large increase in Tc should be possible. The authors indeed found that a large increase of Tc occurs for La2-xSrxCuO4 under epitaxial strain on SLAO substrates.

As reported by F. Tafuri (Napoli) et al., the properties of YBa2Cu3O7-d grain-boundary junctions can be reproducibly modified by focused electron-beam irradiation. Electron irradiation reduces the critical current I_c of the junctions and increases the normal-state specific resistivity R_n.

The morphology of the interface between a superconductor (S, YBCO) and a normal metal (N, Co-doped YBCO) has been found by E. Polturak et al. (Technion) to have a dramatic effect upon the proximity effect. The authors found that depending on the morphology of the S-N interface, the coupling between the S and N layers can be turned on to depress the Tc of S by tens of degrees, or turned off so that the layers appear to be almost totally decoupled. This effect is correlated with the presence of different crystalline orientations at the interface. The range of influence of N on S is about 240 Angstroms, rather than 20 Angstroms expected from the coherence length xi_s.

The topography and crystallography of YBa2Cu3O7-d (YBCO) bicrystal films grown epitaxially on oriented SrTiO3 (STO) bicrystals have been characterized by J. Ayache (Orsay) et al. using scanning and transmission electron microscopies (SEM and TEM) and atomic force microscopy (AFM). In agreement with previous reports, the authors found via TEM analysis that the grain boundary in the film did not always follow the planar substrate grain boundary faithfully, but undulated about the average boundary plane.

As shown by J. H. Claassen (NRL), a two-coil mutual inductance apparatus is capable of yielding information about the E(J) relationship with considerably more sensitivity than is available via the usual transport measurement. The author also reports measurements of a contribution from the reactive nonlinearity of the superconductor, due to depairing effects.

A critical thickness for crack formation has been determined by J. Kawashima et al. (SRL-ISTEC) for YBCO films deposited on SrTiO3 (STO) substrates by the liquid-phase-epitaxy (LPE) method. As-prepared films, even more than 4 micrometers in thickness, have no visible cracks, while oxygen-annealed films show apparent crack propagation depending on the film thickness, leading to an estimate of about 1.35 micrometers for the critical thickness. Films formed on MgO-buffered STO substrates were found to have almost the same critical thickness. By considering thermal expansion of the substrate and the YBCO film, which causes internal stress and crack formation in the film, the authors deduced the effective thermal expansion of YBCO crystalline films to be 13.4 x 10^[- 6] K^[-1].

As reported by D. Goo et al. (KAIST), two pieces of textured Ni tapes have been diffusively bonded under mechanical pressure, 0.3 MPa, at 1,400^oC in a vacuum furnace. The cross-sectional view by SEM showed good bonding without voids in the bonding line, and x-ray-diffraction measurements showed that it was still well textured. A buffer layer of CeO2 and a superconducting layer of YBCO were deposited on the bonded tapes and found to be well textured.

A paper by S. Tokunaga et al. (SRL-ISTEC) reports that an SiO2 film on a YBCO junction is a good passivation film for humidity and annealing.

Applications

The use of small-volume, high-Tc superconducting YBCO thin films as low- power, wide-bandwidth mixers in the frequency range 75 GHz to 2.5 THz is discussed in a preprint by M. Lee (Virginia) et al. The YBCO films were patterned into lattice-cooled hot-electron bolometers (HEBs) coupled to an integrated Au thin-film antenna and transmission line. The bandwidths and small power requirements make these high-Tc superconducting mixers an attractive alternative to existing Schottky diode and conventional superconducting receiver technologies.

The modeling of the electrical properties of high-Tc superconducting bolometers is discussed in a preprint by M. Fardmanesh (Bilkent) and A. Rothwarf (Drexel). The calculated frequency response is in good agreement with experimental results on bolometers made of granular YBCO films on crystalline substrates.

A preprint by X. H. Zeng (Juelich) et al. reports on the performance of a first-order axial electronic gradiometer having a baseline of 10 cm, constructed by assembling two YBa2Cu3O7-d rf SQUID magnetometers with coplanar tank resonators, each having a white magnetic field resolution of about 20 fT/sqrt[Hz] at 77 K. Using a magnetically shielded room of moderate shielding factor, a team of physicians, assisted by two of the authors, used the gradiometer over ten months to perform magnetocardiographic (MCG) measurements in a medical study of about 80 clinical patients, some with cardiac arrhythmia problems and others with healthy hearts. The system's performance was stable during the entire test period.

Two preprints by H.-J. Krause et al. (Juelich) report on the use of a portable high-temperature superconducting (HTS) SQUID system to test for aircraft wheel and fuselage cracks. The authors conclude that once this technology is improved and systems are developed for specific applications, SQUID systems will have a good chance of being established in aircraft testing.

The application of an HTS SQUID system for the detection of defects in NbTi wire manufacturing is reported in a preprint by H. Weinstock (TCSUH) et al. The authors believe the technique would be useful to superconducting wire manufacturers, as it is entirely feasible to use an ordinary HTS SQUID magnetometer to monitor at room temperature the on- line production of composite superconducting wire.

A magnetic levitation system with YBCO superconductors and Nd-Fe-B magnets has been constructed by P. Verges et al. (Dresden). Stable levitation of the superconductor above the magnets is possible without a regulation or feedback circuit. The demonstrator consists of an engine with two 25-mm diameter YBCO disks, cooled by liquid nitrogen, and a magnetic rail made of Nd-Fe-B magnets. The engine levitates about 5 mm above the magnetic rail and moves at a speed of about 1 m/s. A linear induction motor was successfully tested for driving the engine.

Overviews

The use of high-temperature superconducting devices as homodyne and heterodyne bolometric detectors of far infrared or submillimeter waves (0.3 THz or lambda = 1 mm to 15 THz or lambda = 20 micrometers) is discussed in a review by A. J. Kreisler and A. Gaugue (Paris). Topics discuss electromagnetic coupling aspects and treat submillimeter-wave antenna-coupled superconducting and hot-electron bolometers (56 refs.).

The fundamentals of flux pinning in high-temperature superconductors are reviewed, and a selection of recent experimental results on both high- temperature and conventional superconductors is presented and discussed in a preprint by P. H. Kes (Leiden). Topics include critical currents, flux creep, collective pinning, point disorder by oxygen vacancies, and line disorder by columnar defects (49 refs.).

An overview by V. Selvamanickam (IGC) et al. discusses the performance, cost, and geometry requirements of high-temperature superconductors for electric power and high-energy physics applications. The authors describe progress at Intermagnetics General Corporation in developing four types of high-temperature superconductors: powder-in-tube (PIT) Bi-2223, surface-coated Bi-2212, PIT Bi-2212, and surface-coated YBCO. The authors show the transverse cross-section of an 18-strand Rutherford cable fabricated with round, 300-filament, long-length PIT Bi-2212 conductors (18 refs.).

Contributed by John R. Clem

Contents: Technology News begins on page 6; Preprints begin on page 7; Coming Events begin on page 15; Resources are on page 16; and an important renewal notice is on page 17.

High-Tc Update is available without charge to interested persons. Recipients are expected to participate in this information exchange by sending us preprints, reprints, meeting news, research news, etc. Contributions to defray the cost of newsletter printing and mailing are welcome.

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

The following report on a recent market survey of European and global superconductivity markets has been contributed by Dr. Juan Farre, Chairman of Conectus & Managing Director of Nordic Superconductor Technologies A/S.

Conectus-- the CONsortium of European Companies determined To Use Superconductivity--recently announced its recent superconductivity market survey results and made some future projections for the superconductivity markets worldwide. The central objective of Conectus is to strengthen the general infrastructure for commercial applications of superconductivity in Europe. The common basis is to prepare increasingly accurate updates on the state of technology and market developments, thereby providing reliable guidelines for decision-makers in industry, academia, and governments.

Most of today's superconducting products still use LTS materials -- these markets are mostly for magnets, ranging from small magnets for university research to enormous systems for large laboratory facilities, the biggest current market being for magnets used in medical diagnosis, such as Magnetic Resonance Imaging (MRI). As can be seen from the graph, both fields together account for most of today's market which was about 1.8 BECU ($2.1 billion) worldwide in 1997.

Click image to see a larger JPEG version.

In contrast to these traditional fields, there are some exciting new businesses which will be based mostly on HTS. The following areas are addressed: electric power, industrial processing, transportation, (new) medical applications, and information and communication. In the graph, these emerging new businesses are summarized under large scale and electronics applications; no distinction between LTS and HTS is made. Conectus members expect that their growing contributions to the world market will slightly exceed 300 MECU ($350 million) in the year 2003. At this time the EU market share in these new fields is expected to be considerably smaller and estimates suggest that it is about a quarter of the world market. The greatest growth rates among these emerging businesses are seen in the fields of power applications, industrial processing, and communications.

Success in the field of HTS depends on developing materials to techno- economic maturity and organizing efficient production, making model tests of key components, and proving reliability in endurance tests. The consortium estimates the market in 2020 may reach 40 BECU, based on the expectation that market penetration will be about 15% in the key fields.

The Consortium suggests a strong focus on two pre-competitive lines: a) the development of technologies which allow for the cost-effective and reliable manufacture of improved superconducting materials and components; b) the design and operation of systems based on technologies, which are already advanced enough to demonstrate the potential, but not yet competitive.

The membership of Conectus consists of the following corporations:

ACCEL Instruments GmbH Noell-KRC Energie- und Umwelttechnik GmbH Alstom Energie S.A. Nordic Superconductor Technologies A/S Ansaldo Energia s.p.a. Outokumpu Superconductors Oy BICC Cables Ltd. Oxford Instruments plc Cryoelectra GmbH Oxford Instruments Accelerator Technology Group Ericsson Components AB REE Red Electrica Europa Metalli s.p.a. Robert Bosch GmbH Leybold Vakuum GmbH Siemens AG Merck Ltd. THEVA Duennschichttechnik GmbH NKT Research Center A/S Vacuumschmelze GmbH

PREPRINTS To obtain a particular preprint, contact the first author at the address given at the end of the citation. Help us expand this list by sending us your complete preprint. Please specify where and when your paper was submitted. An * next to an entry indicates it is a correction or revision of a previous entry. PACS codes and/or key words are given at the end of the citation.

A. S. Alexandrov, "d-Wave Bose-Einstein Condensate and Tunneling in Superconducting Cuprates." To be published in Physica C (in press). Department of Physics, Loughborough University, Loughborough, Leicestershire LE11 3TU, UNITED KINGDOM; telephone +44 1509 223303; telefax +44 1509 223986; e-mail asa21@cus.cam.ac.uk. Key words: d- wave, Bose-Einstein condensate and tunneling, superconducting cuprates. 74.20.-z.

A. R. Anderson, M. Murakami, K. Nagashima, and G. J. Russell, "Evidence for a Structural Change in TSMG Y123 at 225 K." To be published in Physica C (in press). P.O. Box 88, Oatley, New South Wales 2233, AUSTRALIA; telephone +61 2 9385 9999; telefax +61 2 9385 9864; e-mail a.anderson@unsw.edu.au. Key words: activation energy, internal friction, structural phase transition, ultrasonic attenuation.

Igor S. Aranson, Stefan Scheidl, and Valerii M. Vinokur, "Nonequilibrium Dislocation Dynamics and Instability of Driven Vortex Lattices in Two Dimensions." Submitted to Phys. Rev. B. Contact Janice Coble, Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439; telephone (630) 252-5497; telefax (630) 252- 9595; e-mail coble@anl.gov. 74.60.Ge; 61.72.Bb.

J. Ayache, A. Thorel, J. Lesueur, and U. Dahmen, "Characterization of 3- D Grain Boundary Topography in a YBa2Cu3O7-d Thin Film Bicrystal Grown on a SrTiO3 Substrate." To be published in J. Appl. Phys. CSNSM-CNRS, Universite Paris XI-Orsay, Batiment 108, F-91405 Orsay Cedex, FRANCE; telephone +33 1 69 41-5219 or -6750; telefax +33 1 69 41-5268; e-mail ayache@csn-hp.in2p3.fr.

N. Hari Babu and T. Rajasekharan, "Effect of a Systematic Variation of Nd4Ba2Cu2O10 Content on the Microstructure of Melt Processed NdBa2Cu3O7- d Superconductor." To be published in Physica C (in press). Contact T. Rajasekharan, Defence Metallurgical Research Laboratory, P.O. Kanchanbagh, Hyderabad 500 058, INDIA; telephone +91 40 444 0051; telefax +91 40 444 1439; e-mail tr@dmrl.ernet.in. Key words: grain alignment (texturing), NdBa2Cu3O7-d superconductor, microstructure.

N. Hari Babu, T. Rajasekharan, Latika Menon, S. Srinivas, and S. K. Malik, "Effect of a Systematic Variation of Nd4Ba2Cu2O10 Content on the Magnetic Properties of Melt Processed NdBa2Cu3O7-d Superconductor." To be published in Physica C (in press). Contact T. Rajasekharan, Defence Metallurgical Research Laboratory, P.O. Kanchanbagh, Hyderabad 500 058, INDIA; telephone +91 40 444 0051; telefax +91 40 444 1439; e-mail tr@dmrl.ernet.in. Key words: texturing, magnetization, critical current density, pinning force.

Panayotis Benetatos and M. Cristina Marchetti, "Nonlinear Hydrodynamics of Disentangled Flux-Line Liquids." Submitted to Phys. Rev. B. Department of Physics, Syracuse University, Syracuse, NY 13244; M. Cristina Marchetti's e-mail mcm@suhep.phy.syr.edu; preprint also available at cond-mat@xxx.lanl.gov (#9808270). 74.60.-w; 74.60.Ec.

R. Bundschuh, C. Cassanello, D. Serban, and M. R. Zirnbauer, "Weak Localization of Disordered Quasiparticles in the Mixed Superconducting State." Department of Physics, University of California at San Diego, La Jolla, CA 92093-0319; M. Zirnbauer's e-mail in Koeln, Germany zirn@thp.uni-koeln.de; preprint also available at cond-mat@xxx.lanl.gov (#9808297).

O. M. Cappannini, C. O. Rodriguez, and N. E. Christensen, "Pressure Dependence of Compressibilities in YNi2B2C and YPd2B2C." To be published in Physica C (in press). IFLYSIB, Grupo de Fisica del Solido, C.C. 565, 1900 La Plata, ARGENTINA; telephone +54 21 25 4904; telefax +54 21 25 7317; e-mail osvaldo@iflysib1.unlp.edu.ar. Key words: pressure, FP-LMTO scheme, compressibilities.

H. Castro and L. Rinderer, "Magnetic Flux Diffusion in High-Tc Superconductors: Step Response and ac Susceptibility." To be published in IEEE Trans. Appl. Supercond. School of Physics and Astronomy, Tel Aviv University, 69978 Tel Aviv, ISRAEL; telephone +972 3 640 7023; telefax +972 3 642 2979; e-mail hcastro@ccsg.tav.ac.il.

Mahesh Chandran, "Field Distribution in Thin Superconductors with Secondary Peak in Magnetization." To be published in Physica C (in press). Low Temperature Physics Group, Centre for Advanced Technology, P.O. CAT, Indore 452013, INDIA; telefax +91 731 488300; e-mail maheshc@cat.ernet.in. Key words: superconductors, secondary peak, magnetization.

Wu Ming Chen, S. S. Jiang, Y. C. Guo, L. Y. Li, L. Qiu, S. Y. Ding, K. Shen, and S. X. Dou, "Superconducting and Structural Effects of Grinding upon YBa2Cu3Oy." To be published in Physica C (in press). Department of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, PEOPLE'S REPUBLIC OF CHINA; telephone +86 25 3302 728; telefax +86 25 3302 728; e-mail wmchen@nju.edu.cn. Key words: effects of grinding, regrowth, superconductivity, YBCO, susceptibility.

Xiaojia Chen and Changde Gong, "Pressure-Induced Charge Transfer and Pressure Effect on Tc in Tl2Ba2CuO6+d Compounds." To be published in Physica C (in press). National Laboratory of Solid State Microstructures, Institute for Solid State Physics, Nanjing University, Nanjing 210093, PEOPLE'S REPUBLIC OF CHINA; telefax +86 25 332 6028; e- mail zyq@nju.edu.cn. Key words: pressure, temperature, transfer model. 74.72.Fq; 74.62.Fj.

A. L. Chernyshev, P. W. Leung, and R. J. Gooding, "A Comprehensive Numerical and Analytical Study of Two Holes Doped into the 2D t-J Model." Submitted to Phys. Rev. B. Department of Physics, Queen's University, Kingston, Ontario, CANADA K7L 3N6; preprint also available at cond-mat@xxx.lanl.gov (#9806018).

J. H. Claassen, "Interpretation of the Nonlinear Inductive Response of Superconducting Films." To be published in Proc. of the NATO Adv. Study Inst. -- Phys. and Mater. Sci. of the Vortex States, Flux Pinning, and Dynamics, Kusadasi, Turkey, July 26-Aug. 8, 1998. Code 6344, Naval Research Laboratory, Washington, DC 20375-5343; telephone (202) 767- 6124; telefax (202) 767-1697; e-mail claassen@foucault.nrl.navy.mil.

A. M. Cucolo, "Zero Bias Conductance Peaks in High-Tc Superconductors: Clues and Ambiguities of Two Mutually Excluding Models." To be published in Physica C (in press). Dipartimento di Fisica e Unita INFM, Universita di Salerno, Via S. Allende, I-84081 Baronissi (Salerno), ITALY; telephone +39 89 965258; telefax +39 89 722582. Key words: high-Tc superconductors, tunneling spectroscopy, superconducting-state properties, normal-state properties.

B. C. den Hertog, "Ground State Properties of the BCS-Bose Einstein Crossover in a d_[x^2-y^2] Wave Superconductor." Department of Physics, University of Waterloo, 200 University Ave. W., Waterloo, Ontario, CANADA N2L 3G1; telephone (519) 888-4567 ext. 3555; telefax (519) 746- 8115; e-mail byrondh@gandalf.uwaterloo.ca; Web site http://sciborg.uwaterloo.ca/~bhertog; preprint also available at cond- mat@xxx.lanl.gov (#9808051).

C.N.L. Edvardsson, U. Helmersson, L. D. Madsen, Zs. Czigany, L. Ryen, and E. Olsson, "Formation of Secondary Phases in YBa2Cu3O7-d/SrTiO3 Multilayers." To be published in Physica C (in press). Department of Physics, Linkoeping University, SE-581 83 Linkoeping, SWEDEN; telephone +46 1328 1257; telefax +46 1313 7568; e-mail nic@ifm.liu.se. Key words: phase formation, multilayered structures, magnetron sputtering. 74.76.Bz; 77.55.+f.

M. V. Eremin, I. A. Larionov, and S. V. Varlamov, "CDW Scenario for Pseudogap in Normal State of Bilayer Cuprates." Presented at the Int. Conf. on Strongly Correlated Electron Systems (SCES-98), Paris, France, July 15-18, 1998; submitted to Physica B. Kazan State University, 420008 Kazan, RUSSIA; telefax +7 8432 380994; e-mail mikhail.eremin@ksu.ru. Key words: singlet-correlated band, superconductivity, CDW, pseudogap.

M. Fardmanesh and A. Rothwarf, "Analytic Modeling of Patterned High-Tc Superconductive Bolometers: Film and Substrate Interface Effects." To be published in Superconducting and Related Oxides: Physics and Nanoengineering III, edited by D. Pavuna and I. Bozovic, SPIE Proc. 3481 (SPIE, Bellingham, 1998). Department of Electrical and Electronics Engineering, Bilkent University, Ankara 06533, TURKEY. Key words: superconducting, YBCO, bolometer, interface, modeling.

V. Fuentes, M. de Llano, M. Grether, and M. A. Solis, "Superconducting Transition-Temperature Enhancement Due to Electronic-Band-Structure Density-of-States." To be published in Rev. Mex. Fis. (in press). Contact M. A. Solis, Instituo de Fisica, Universidad Nacional Autonoma de Mexico, 01000 Mexico DF, MEXICO; e-mail masolis@fenix.ifisicacu.unam.mx. Key words: superconductivity, Bose- Einstein condensation, electronic density of state. 05.30.Jp; 71.20.-b; 74.70.-b; 74.72.-h.

Nobuo Furukawa, T. M. Rice, and Manfred Salmhofer, "Truncation of a Two- Dimensional Fermi Surface Due to Quasiparticle Gap Formation at the Saddle Points." Institute for Theoretical Physics, ETH Hoenggerberg, CH-8093 Zurich, SWITZERLAND; e-mail furukawa@itp.phys.ethz.ch; preprint also available at cond-mat@xxx.lanl.gov (#9806159). 71.10.Hf; 74.72.-h; 71.27.+a.

A. A. Gapud, T. Aytug, S. H. Yoo, Y. Y. Xie, B. W. Kang, S. D. Gapud, J. Z. Wu, S. W. Wu, W. Y. Liang, X. T. Cui, J. R. Liu, and W. K. Chu, "Lithium-Doping-Assisted Growth of HgBa2Ca2Cu3O8+d Superconducting Phase in Bulks and Thin Films." Submitted to Physica C. Department of Physics and Astronomy, University of Kansas, Lawrence, KS 66045-2151; e- mail gapud@ukans.edu. Key words: high temperature superconductivity, thin films, lithium, Hg-1223. 74.72.Gr; 74.62.Bf.

A. A. Gapud, J. Z. Wu, B. W. Kang, S. L. Yan, Y. Y. Xie, and M. P. Siegal, "Nature of the Giant Tc Shift in '1212' Superconductors Due to Hg/Tl Exchange." Submitted to Phys. Rev. B. Department of Physics and Astronomy, University of Kansas, Lawrence, KS 66045-2151; e-mail gapud@ukans.edu. Key words: irreversibility line, anisotropy, critical temperature, transport. 74.62.Dh; 74.72.Gr; 74.72.Fq; 74.60.Ge.

Yu. A. Genenko, P. Troche, J. Hoffmann, and H. C. Freyhardt, "Chain Model for the Spiral Instability of the Force-Free Configuration in Thin Superconducting Films." To be published in Phys. Rev. B (in press). Material Physics Institute, University of Goettingen, Windausweg 2, D- 37073 Goettingen, GERMANY; telephone +49 551 395 011; telefax +49 551 507 1750; e-mail genenko@umpsun1.gwdg.de. 74.25.Ha; 74.60.Ec; 74.60.Jg; 74.76.-w.

Doohoon Goo, Sanghyun Oh, JunHo Kim, Kookchae Jung, and D. Youm, "Diffusion Bonding of the Textured Ni Tapes for the Substrate of YBCO Coated Conductors." To be published in Physica C (in press). Department of Physics, Korea Advanced Institute of Science and Technology, Kusong-Dong, Yusung-Gu, Taejon 305-701, SOUTH KOREA; telephone +82 42 869 2570; telefax +82 42 869 2510; e-mail djyoum@sorak.kaist.ac.kr. Key words: superconducting, YBCO, texture, Ni tape, bonding. 74.76.Bz; 81.15.-z.

Enzo Granato, "Current-Voltage Scaling of Chiral and Gauge Glass Models of Two-Dimensional Superconductors." To be published in Phys. Rev. B. Laboratorio Associado de Sensores e Materiais, Instituto Nacional de Pesquisas Espaciais, 12201 Sao Jose dos Campos, SP, BRAZIL; e-mail enzo@las.inpe.br; preprint also available at cond-mat@xxx.lanl.gov (#9808331). 74.40.+k; 74.60.-w; 75.40.Mg.

S. A. Grigera, E. Morre, E. Osquiguil, C. Balseiro, G. Nieva, and F. de la Cruz, "The Bose-Glass Phase in Twinned YBa2Cu3O7-d." To be published in Phys. Rev. Lett. Centro Atomico Bariloche and Instituto Balseiro, Comision Nacional de Energia Atomica, 8400 San Carlos de Bariloche, ARGENTINA; e-mail grigera@cab.cnea.edu.ar; Web site http://cabbat1.cnea.edu.ar/~grigera/; preprint also available at cond- mat@xxx.lanl.gov (#9806376).

Vahe A. Grigoryan, "The Influence of Structural Inhomogeneities on Intragranular Properties of Y- and Bi-Based Superconductors." Preprint #YerPhi-1518(18)-98. Department of Physics, Yerevan State University, 1 Alec Manoogian Street, 375049 Yerevan, ARMENIA; e-mail grigor@lx2.yerphi.am; preprint also available at cond-mat@xxx.lanl.gov (#9808126).

R. R. Gulamova, E. M. Gasanov, R. Alimov, and Kim Gen Chan, "Thermal and Radiation Induced Changes of Structure and Luminescence Properties of YBa2Cu3O7-x Ceramics." To be published in Superconducting and Related Oxides: Physics and Nanoengineering III, edited by D. Pavuna and I. Bozovic, SPIE Proc. 3481 (SPIE, Bellingham, 1998). Institute of Nuclear Physics, Ulugbek 702132, Tashkent, UZBEKISTAN; telephone +7 3712 616474; telefax +7 3712 642590; e-mail gasanov@pc202.suninp.tashkent.su. Key words: YBa2Cu3O7-x ceramic, gamma- and n-gamma-irradiations effect, luminescence, thermal treatment, defect formation.

Raju P. Gupta and Michele Gupta, "Effect of Zinc Substitution on the Carrier Density in YBa2Cu3O7-d Superconductors." To be published in Physica C (in press). Section de Recherches de Metallurgie Physique, Centre d'Etudes de Saclay, F-91191 Gif sur Yvette Cedex, FRANCE; telephone +33 1 6908 5959; telefax +33 1 6909 6867. Key words: zinc substitution, carrier density, superconductors.

Ernst L. Haase, "Extended Ginzburg-Landau Theory of HTS: The Coupling of the Superconducting to a Structural Phase Transition Strongly Enhances Tc." Presented at the NATO Adv. Study Inst. -- Phys. and Mater. Sci. of the Vortex States, Flux Pinning, and Dynamics, Kusadasi, Turkey, July 26-Aug. 8, 1998. Forschungszentrum Karlsruhe, IMF III, P.O. Box 3640, D-76021 Karlsruhe, GERMANY; telephone +49 7247 82 2807; telefax +49 7247 82 3956; e-mail haase@imf.fzk.de.

T. Ito, H. Suematsu, K. Isawa, M. Karppinen, and H. Yamauchi, "Optimization of the Synthesis and Tuning the Oxygen Content of the CuBa2Ca2Cu3O8+d (Cu:1223:P) Superconductor." To be published in Physica C. Contact H. Yamauchi, Materials & Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 227, JAPAN; telephone +81 45 924 5315; telefax +81 45 924 5365; e-mail yamauchi@materia.titech.ac.jp.

T. Ito, H. Suematsu, M. Karppinen, and H. Yamauchi, "Oxygen Content in High-Pressure Synthesized CuBa2Ca3Cu4O10+d (Cu:1234:P) Superconductor." To be published in Physica C. Contact H. Yamauchi, Materials & Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 227, JAPAN; telephone +81 45 924 5315; telefax +81 45 924 5365; e-mail yamauchi@materia.titech.ac.jp.

H. Iwasaki, T. Matsumoto, F. Yukimachi, K. Tanigawa, and F. Matsuoka, "Observation of Pancake-Like Vortex in the Angular Dependence of the Magnetization Around H||a-Axis in Nd1.858Ce0.142CuO4 Single Crystal." To be published in Physica C (in press). School of Materials Science, Japan Advanced Institute of Science and Technology, Hokuriku (JAIST), Asahidai 1-1, Tatsunokuchi 923-12, Ishikawa, JAPAN; telephone +81 761 511512; telefax +81 761 511149; e-mail hideo@jaist.ac.jp.

Ulf Jaenicke-Roessler, Gernot Zahn, Peter Paufler, Holger Bitterlich, and Guenter Behr, "Pressure Dependence of Unit Cell Geometry of Single Crystalline TbNi2B2C." To be published in Physica C (in press). Contact Peter Paufler, Institut fuer Kristallographie und Festkoerperphysik, Fachrichtung Physik der Technischen Universitaet, D- 01062 Dresden, GERMANY; telephone +49 351 463 4670; telefax +49 351 463 7048; e-mail paufler@physik.tu-dresden.de. Key words: TbNi2B2C, x-ray diffraction, elastic constants, bulk modulus, high-pressure effects. 61.12.Ld; 62.20.Dc; 62.50.+p.

H. Jiang, F. H. Li, W. Liu, Y. Zhang, and Z. Q. Mao, "Structural Modulation in Bi2(Sr0.9La0.1)2Cu1-xCoxOy (x=0.2,0.6,1.0)." To be published in Physica C (in press). Contact F. H. Li, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, PEOPLE'S REPUBLIC OF CHINA; telephone +86 10 6255 9131 ext. 270; telefax +86 10 6256 2605; e-mail lifh@aphy02.iphy.ac.cn. Key words: structural modulation, electron microscopy, Bi2(Sr0.9La0.1)2Cu1-xCoxOy.

J. Jiang, T. C. Shields, J. S. Abell, and G. Bushnell-Wye, "Investigation of Phase and Texture Evolution During Thermomechanical Processing in Bi(Pb)-2223/Ag Tapes by High Energy Synchrotron X-ray Diffraction." To be published in Physica C (in press). Contact J. S. Abell, School of Metallurgy and Materials, University of Birmingham, Edgbaston, Birmingham B15 2TT, UNITED KINGDOM; telefax +44 121 414 5232; e-mail j.s.abell@bham.ac.uk. Key words: x-ray diffraction (XRD), texture, phase. 74.72.Hs; 74.62.Bf; 85.25.Kx; 81.40.-z.

Junichi Kawashima, Yasuji Yamada, and Izumi Hirabayashi, "Critical Thickness and Effective Thermal Expansion Coefficient of YBCO Crystalline Film." To be published in Physica C (in press). Contact Yasuji Yamada, Nagoya Laboratory, Superconductivity Research Laboratory, International Superconductivity Technology Center (ISTEC), 4-1 Matsuno 2-chome, Atsuta-ku, Nagoya 456, JAPAN; telephone +81 52 871 4002; telefax +81 52 871 4090; e-mail yamada@istec.or.jp. Key words: YBa2Cu3O7-d, thermal expansion coefficient, cracks, thin film, MgO buffer layer.

K. Kellner, K. Przybylski, and G. Gritzner, "Microstructure and Phase Composition of Hg-1223 Bulk Phase Superconductors." Contact G. Gritzner, Institut fuer Chemische Technologie Anorganischer Stoffe, Johannes Kepler Universitaet, A-4040 Linz, AUSTRIA; telephone +43 732 2468 703; telefax +43 732 2468 905; e-mail gerhard.gritzner@ictas.uni- linz.ac.at. Key words: Hg-1223 superconductors, microstructure, secondary phases.

P. H. Kes, "Pinning Mechanisms in High-Tc Superconductors." Presented at the NATO Adv. Study Inst. -- Phys. and Mater. Sci. of the Vortex States, Flux Pinning, and Dynamics, Kusadasi, Turkey, July 26-Aug. 8, 1998. Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, THE NETHERLANDS.

N. R. Khasanova, A. Yamamoto, S. Tajima, X.-J. Wu, and K. Tanabe, "Superconductivity at 10.2 K in the K-Bi-O System." To be published in Physica C (in press). Superconductivity Research Laboratory, International Superconductivity Technology Center (ISTEC), 10-13 Shinonome 1-chome, Koto-ku, Tokyo 135-006, JAPAN; telephone +81 3 3536 5714; telefax +81 3 3536 0618; e-mail nellie@istec.or.jp. Key words: bismuth oxide based superconductor, doping level, structural transformation.

A. Knizhnik, C. G. Kuper, and Y. Eckstein, "Oxidation State of Copper in Optimally Oxygen-Doped 1:2:3 CLBLCO Superconductors." To be published in Phys. Rev. B. Crown Center for Superconductivity and Department of Physics, Technion, Israel Institute of Technology, 32000 Haifa, ISRAEL; telephone +972 4 829-3551 or -3687; telefax +972 4 822 1514; e-mail arkady@physics.technion.ac.il.

H.-J. Krause, R. Hohmann, M. Grueneklee, M. Maus, Y. Zhang, D. Lomparski, H. Soltner, W. Wolf, M. Banzet, J. Schubert, W. Zander, H. Bousack, and A. I. Braginski, "Aircraft Wheel and Fuselage Testing with Eddy Current and SQUID." Institut fuer Schicht- und lonentechnik, Forschungszentrum Juelich GmbH, D-52425 Juelich, GERMANY; A. I. Braginski's telephone +49 2461 612330; telefax +49 2461 612333; e-mail alexbrag@isitel1.isi.kfa.juelich.de.

H.-J. Krause, R. Hohmann, M. Grueneklee, M. Maus, Y. Zhang, D. Lomparski, W. Wolf, H. Bousack, and A. I. Braginski, "Aircraft Wheel and Fuselage Testing with HTS SQUID." To be published in the Proc. of the 4th Twente HTS Workshop, Enschede, THE NETHERLANDS, May 6-7, 1998. Institut fuer Schicht- und lonentechnik, Forschungszentrum Juelich GmbH, D-52425 Juelich, GERMANY; A. I. Braginski's telephone +49 2461 612330; telefax +49 2461 612333; e-mail alexbrag@isitel1.isi.kfa.juelich.de.

Alain J. Kreisler and Alain Gaugue, "Recent Progress in HTSC Bolometric Detectors at Terahertz Frequencies." To be published in Superconducting and Related Oxides: Physics and Nanoengineering III, edited by D. Pavuna and I. Bozovic, SPIE Proc. 3481 (SPIE, Bellingham, 1998). Laboratoire de Genie Electrique de Paris, Universites Paris 6 et Paris 11, URA 127 CNRS, SUPELEC, Plateau de Moulon, F-91192 Gif Sur Yvette Cedex, FRANCE; e-mail alain.kreisler@supelec.fr. Key words: superconducting detector, submillimeter waves, homodyne detector, heterodyne detector, absorber coupling, antenna coupling, microbolometer, hot-electron bolometer.

L. Krusin-Elbaum, G. Blatter, J. R. Thompson, D. K. Petrov, R. Wheeler, J. Ullmann, and C. W. Chu, "Anisotropic Rescaling of a Splayed Pinning Landscape in Hg Cuprates: Strong Vortex Pinning and Recovery of Variable Range Hopping." To be published in Phys. Rev. Lett. IBM Thomas J. Watson Research Center, P.O. Box 218, Yorktown Heights, NY 10598.

Y. Kuwasawa, K. Kato, M. Matsuo, and T. Nojima, "Indications of Pair Electron Effect Above Field Induced Superconductor-Insulator Transition in Amorphous Ultra Thin W Films with Si/W/Si Structure." To be published in Physica C (in press). Faculty of Science, Department of Physics, Chiba University, 1-33 Yayoicho, Inage-ku, Chiba 263-0043, JAPAN; telephone +81 43 290 2756; telefax +81 43 290 2874; e-mail kuwasawa@science.s.chiba-u.ac.jp. Key words: superconductor-insulator transition, fluctuation, localization, Bose glass. 74.40.+k; 74.70.-b; 74.76.Db.

R. M. Langan, S. N. Gordeev, P.A.J. de Groot, A.G.M. Jansen, R. Gagnon, and L. Taillefer, "Phase Diagram of Optimally Doped YBa2Cu3O7-d: Effect of Oxygen Stoichiometry." Submitted to Phys. Rev. B. Contact S. N. Gordeev, Department of Physics, University of Southampton, Highfield, Southampton SO17 1BJ, UNITED KINGDOM; telephone +44 1703 592077; telefax +44 1703 593910; e-mail sg@phys.soton.ac.uk. 74.60.Ge; 74.72.Bk.

Mark Lee, C.-T. Li, B. S. Deaver, Jr., R. M. Weikle, R. A. Rao, and C. B. Eom, "Nonlinear THz Mixing in YBa2Cu3O7 Thin Film Hot Electron Bolometers." To be published in Superconducting and Related Oxides: Physics and Nanoengineering III, edited by D. Pavuna and I. Bozovic, SPIE Proc. 3481 (SPIE, Bellingham, 1998). Department of Physics, University of Virginia, Charlottesville, VA 22903.

M. Maciag, B. Andrzejewski, and J. Stankowski, "Demagnetizing Effect in HTS in GHz Frequency Fields." Submitted to Physica C. Contact B. Andrzejewski, Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, PL-60179 Poznan, POLAND; telephone +48 61 8612 483; telefax +48 61 8684 524; e-mail and@ifmpan.poznan.pl. Key words: demagnetizing effect, microwave absorption, granular superconductivity.

S. Malo, C. Michel, D. Pelloquin, M. Hervieu, O. Toulemonde, and B. Raveau, "Compared Structural Behavior of Hg0.5Cr0.5Sr2CuO4.82 and Hg0.5Cr0.5Sr4Cu2O7CO3 Superconductors." To be published in Physica C (in press). Laboratoire CRISMAT, UMR 6508 associee au CNRS, ISMRA et Universite de Caen, 6 Boulevard du Marechal Juin, F-14050 Caen Cedex, FRANCE; telephone +33 231 452631; telefax +33 231 951600; e-mail c.michel@crismat.ismra.fr. Key words: Hg0.5Cr0.5Sr4Cu2O7CO3 superconductor, crystallography, neutron powder diffraction.

A. A. Martin, V. G. Hadjiev, T. Ruf, M. Cardona, and T. Wolf, "Anomalous Phonon Self-Energy Effects in SmBa2Cu3Oy: A Raman Study." Submitted to Phys. Rev. B. Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, GERMANY; telephone +49 711 689 1754; telefax +49 711 689 1712; e-mail amartin@cardix.mpi- stuttgart.mpg.de. 78.30.Hv; 71.70.-d; 63.20.Ls.

Yasunori Mawatari, "Electric-Charge Distribution Arising from Hall Effects in Superconducting Strips." To be published in Phys. Rev. B. Frontier Technology Division, Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki 305-8568, JAPAN; telephone +81 298 54 5737; telefax +81 298 54 5726; e-mail mawatari@etl.go.jp.

H. Michor, G. Hilscher, R. Krendelsberger, P. Rogl, and F. Bouree, "The Effect of Ni-Site Substitutions in Superconducting La3Ni2B2N3-d." To be published in Phys. Rev. B. Institut fuer Experimentalphysik, Technische Universitaet Wien, Wiedner Hauptstrasse 8-10, A-1040 Wien, AUSTRIA; telephone +43 1 58801 5780; telefax +43 1 5863191; e-mail herwig@xphys.tuwien.ac.at. 74.25.Bt; 74.62.Fj; 74.72.Yg; 63.20.Kr.

D. B. Mijatovic, Lj. Maskovic, and M. Pantic, "Coefficient of Electron Diffusion in a Single-Crystal Thin Film." To be published in Superconducting and Related Oxides: Physics and Nanoengineering III, edited by D. Pavuna and I. Bozovic, SPIE Proc. 3481 (SPIE, Bellingham, 1998). Institute of Physics, Trg Dositeja Obradovica 4, 21000 Novi Sad, Serbia, YUGOSLAVIA. Key words: thin crystal film, electron diffusion, Kubo formula, Debye temperature.

K. Mikhalev, K. Kumagai, Y. Furukawa, V. Bobrovskii, T. D'yachkova, N. Kad'irova, and A. Gerashenko, "[63]^Cu NMR Study of Infinite-Layer Compound Sr1-xLaxCuO2." To be published in Physica C (in press). Institute of Metal Physics, Russian Academy of Sciences, Kovalevskaya str. 18, Ekaterinburg 620219, RUSSIA; telephone +7 343 249 9053; telefax +7 343 274 5244; e-mail mikhalev@imp.uran.ru. Key words: CuO2 planes, Knight shift, quadrupolar frequency, NMR.

Akihiro Oka, Satoshi Koyama, and Yuh Shiohara, "Study of Oxygen Diffusion in NdBa2Cu3O7-d Single Crystal by In-Situ Observation of Twin Formation." To be published in Physica C (in press). Superconductivity Research Laboratory, Division 4, International Superconductivity Technology Center (ISTEC), 10-13 Shinonome 1-chome, Koto-ku, Tokyo 135- 0062, JAPAN; telephone +81 3 3536 5711; telefax +81 3 3536 5705; e-mail okaaki@istec.or.jp. Key words: Nd123 single crystal, Y123 single crystal, chemical oxygen diffusion, nonstoichiometric composition, twin formation, O-T transition.

Jaakko Paasi, Peter Kottman, Milan Majoros, and Vladimir Plechacek, "Intergranular and Intragranular Currents in (Bi,Pb)2Sr2Ca2Cu3O10+x Superconductors: Temperature Dependence in Low Magnetic Fields." To be published in Physica C (in press). Laboratory of Electricity and Magnetism, Tampere University of Technology, P.O. Box 692, FIN-33101 Tampere, FINLAND; telephone +358 3 365 2009; telefax +358 3 365 2160; e- mail paasi@cc.tut.fi. Key words: granular superconductivity, critical current density, magnetization. 74.80.Bj; 74.60.Jg; 74.25.Ha; 74.72.Hs.

A. K. Pandey, G. D. Verma, and O. N. Srivastava, "Investigations on the Tl-Doped Hg-Ba-Ca-Cu-O High Temperature Superconductors in Regard to Hole Doping and Microstructural Characteristics." To be published in Physica C (in press). Contact O. N. Srivastava, Department of Physics, Banaras Hindu University, Varanasi 221005, INDIA; telephone +91 542 36 1937; telefax +91 542 31 7468. Key words: superconductivity, mercury- thallium, doping, microstructure.

C. Park, W. Wong-Ng, L. P. Cook, R. L. Snyder, P.V.P.S.S. Sastry, and A. R. West, "Melting Investigation of Bi2Sr1.9Ca2.1Cu3O10+x by High Temperature X-ray Diffraction and Quenching." To be published in Physica C (in press). Contact W. Wong-Ng, Ceramics Division, National Institute of Standards and Technology, Gaithersburg, MD 20899; telephone (301) 975-5791; telefax (301) 975-5334; e-mail wongng@tiber.nist.gov. Key words: melting, Bi2Sr1.9Ca2.1Cu3O10+x, high-temperature x-ray diffraction (HTXRD), quenching.

J. Perret, J. Fompeyrine, J. W. Seo, E. Maechler, O. Fischer, P. Martinoli, and J.-P. Locquet, "Critical Temperature Enhancement by Means of Substrate-Induced Pressure." To be published in Superconducting and Related Oxides: Physics and Nanoengineering III, edited by D. Pavuna and I. Bozovic, SPIE Proc. 3481 (SPIE, Bellingham, 1998). Institut de Physique, Universite de Neuchatel, CH-2000 Neuchatel, SWITZERLAND; e- mail joel.perret@iph.unine.ch. Key words: cuprate, superconductivity oxide, thin films, epitaxial strain.

J. Pitel and P. Kovac, "Influence of an Axial Current Density Stepping on the Critical Currents and Magnetic Field of Cylindrical Magnets Wound with Bi(2223)Ag Anisotropic Tapes: Theoretical Analysis." To be published in Physica C (in press). Institute of Electrical Engineering, Slovak Academy of Sciences, Dubravska cesta 9, 84239 Bratislava, SLOVAKIA; telefax +421 7 375 816; e-mail elekpit@savba.sk. Key words: high Tc Bi(2223)Ag pancake coils, current density stepping, critical currents.

Emil Polturak, Ofer Nesher, and Gad Koren, "Role of Interface Orientation in the Coupling of an Anisotropic Superconductor with a Normal Conductor." To be published in Superconducting and Related Oxides: Physics and Nanoengineering III, edited by D. Pavuna and I. Bozovic, SPIE Proc. 3481 (SPIE, Bellingham, 1998). Department of Physics, Technion Israel Institute of Technology, Haifa 32000, ISRAEL.

Gregory C. Psaltakis, "Flux Quantization and Superfluid Weight in Doped Antiferromagnets." To be published in J. Phys. Cond. Mat. Department of Physics, University of Crete and Research Center of Crete, P.O. Box 2208, Heraklion GR-71003 Crete, GREECE; telephone +30 81-394000 or -394200; telefax +30 81-394201; e-mail psaltaki@physics.uch.gr; preprint also available at cond-mat@xxx.lanl.gov (#9809034). 71.27.+a; 74.20.Mn.

Michal Rabara, Yoshikatsu Yoshida, Takao Takeuchi, Predrag Miranovic, and Kenzo Miya, "Irreversibility Field Analysis for Bi2Sr2Ca2Cu3Ox Tapes by Using Axial Probe." To be published in Physica C (in press). School of Engineering, University of Tokyo, Tokai-mura, Naka-gun, Ibaraki 319- 1106, JAPAN; telephone +81 29 287 8423; telefax +81 29 287 8488; e-mail rabara@tokai.t.u-tokyo.ac.jp. Key words: axial probe, Bi2223 superconductor, critical current, scaling law, irreversibility lines, fluxoid correlation.

M. Ricco, L. Menozzi, R. De Renzi, and F. Bolzoni, "Korringa Relation and Hebel-Slichter Peak in Ammonia Intercalated Fullerides by [1]^H NMR." To be published in Physica C (in press). Dipartimento di Fisica and Istituto Nazionale di Fisica della Materia, Universita degli Studi di Parma, Viale delle Scienze, I-43100 Parma, ITALY; telephone +39 521 905217; telefax +39 521 905223; e-mail ricco@fis.unipr.it. Key words: spin-lattice relaxation, fullerene-based superconductors, anisotropy, extended Korringa relation, Hebel-Slichter peak. 74.70.Wz; 76.60.Es.

J.-M. Robin, A. Romano, and J. Ranninger, "Metal-Insulator Crossover in the Boson-Fermion Model in Infinite Dimensions." To be published in Phys. Rev. Lett. Max-Planck-Institut fuer Physik Komplexer Systeme, Noethnitzerstrasse 38, D-01187 Dresden, GERMANY; A. Romano's e-mail in Salerno, Italy alforom@vaxsa.csied.unisa.it; preprint also available at cond-mat@xxx.lanl.gov (#9808252). 71.30.+h; 71.10.Hf; 71.10.Fd; 74.20.Mn.

P. Rubin and A. Sherman, "Ferron-Like States in YBa2Cu3O6+x." Submitted to Phys. Stat. Solidi (b). Institute of Physics, University of Tartu, Riia 142, 51014 Tartu, ESTONIA; telephone +372 7 428164; telefax +372 7 383033; e-mail rubin@rsl.park.tartu.ee. 71.55.-i; 75.50.Ee.

L. Ryen, E. Olsson, C.N.L. Edvardsson, and U. Helmersson, "Dislocations, Strain, and Defects in Heteroepitaxial YBa2Cu3O7-x/SrTiO3 Multilayers." To be published in Physica C (in press). Department of Experimental Physics, Chalmers University of Technology, SE-412 96 Gothenburg, SWEDEN; telephone +46 31 772 3386; telefax +46 31 772 3224. Key words: heteroepitaxial YBa2Cu3O7-x/SrTiO3 multilayers, high-resolution transmission electron microscopy, three-dimensional growth mode.

V. Selvamanickam, D. W. Hazelton, L. Motowidlo, F. Krahula, J. Hoehn, Jr., M. S. Walker, and P. Haldar, "High-Temperature Superconductors for Electric Power and High-Energy Physics." To be published in JOM (in press). Intermagnetics General Corporation, P.O. Box 461, Latham, NY 12110-0461; telephone (518) 782-1122; telefax (518) 783-2601; e-mail selva@igc.com.

J. W. Seo, J. Perret, J. Fompeyrine, G. Van Tendeloo, and J.-P. Locquet, "Microstructural Investigation of La1.9Sr0.1CuO4 Thin Films Grown by MBE." To be published in Superconducting and Related Oxides: Physics and Nanoengineering III, edited by D. Pavuna and I. Bozovic, SPIE Proc. 3481 (SPIE, Bellingham, 1998). IBM Research Division, Zurich Research Laboratory, Saeumerstrasse 4, CH-8803 Rueschlikon, SWITZERLAND; e-mail jwm@zurich.ibm.com. Key words: superconductivity, cuprate, thin films, epitaxial strain, microstructure, TEM.

S. Shamoto, T. Kato, Y. Ono, Y. Miyazaki, K. Ohoyama, M. Ohashi, Y. Yamaguchi, and T. Kajitani, "Structures of beta--ZrNCl and Superconducting Li0.16ZrNCl: Double Honeycomb Lattice Superconductor." To be published in Physica C (in press). Department of Applied Physics, Tohoku University, Sendai 980-8579, JAPAN; telephone +81 22 217 7970; telefax +81 22 217 7970; e-mail shamoto@mail.cc.tohoku.ac.jp. Key words: layered nitride, neutron diffraction, structure, ZrNCl, honeycomb lattice. 61.12.-q; 61.12.Ld; 74.62.Bf; 74.70.-b.

J. B. Shi, "Dielectric Studies in T* and T' Structures of (La,Gd)2CuO4." To be published in Physica C (in press). Department of Electronic Engineering, Feng Chia University, Taichung 407, Taiwan, REPUBLIC OF CHINA; telephone +886 4 4519371; telefax +886 4 4510405; e-mail ece_shi@fcu.edu.tw. Key words: dielectric constant, copper oxide, superconductivity, (La,Gd)2CuO4.

A. Sin, A. G. Cunha, A. Calleja, M.T.D. Orlando, F. G. Emmerich, E. Baggio-Saitovich, S. Pinol, J. M. Chimenos, and X. Obradors, "Formation and Stability of HgCaO2, a Competing Phase in the Synthesis of Hg1- xRexBa2Ca2Cu3O8+d Superconductor." To be published in Physica C (in press). Institut de Ciencia de Materials de Barcelona, (CSIC), Campus Universitat Autonoma de Barcelona, E-08193 Bellaterra (Barcelona), SPAIN; telephone +34 3 5801853; telefax +34 3 5805729; e-mail sin@icmvax.icmab.es. Key words: synthesis of Hg,Re-1223, synthesis of HgCaO2.

F. Tafuri, B. Nadgorny, S. Shokhor, M. Gurvitch, F. Lombardi, F. Carillo, and A. Di Chiara, "Effects Induced by Electron Beam Irradiation on Y1Ba2Cu3O7-x Josephson Structures: A New Approach to Control the Junction Barrier Properties." To be published in Superconducting and Related Oxides: Physics and Nanoengineering III, edited by D. Pavuna and I. Bozovic, SPIE Proc. 3481 (SPIE, Bellingham, 1998). INFM- Dipartimento di Scienze Fisiche, Universita di Napoli "Federico II", I- 80125 Napoli, ITALY; e-mail tafuri@axpna1.na.infn.it. Key words: Josephson junctions, YBaCuO, grain boundaries, electron irradiation.

A. Tampieri, G. Calestani, G. Celotti, R. Masini, and S. Lesca, "Multi- Step Process to Prepare Bulk BSCCO (2223) Superconductor with Improved Transport Properties." To be published in Physica C (in press). IRTEC- CNR, via Granarolo 64, I-48018 Faenza, ITALY; telephone +39 546 69971; telefax +39 546 46381; e-mail irtec@irtec1.irtec.bo.cnr.it. Key words: BSCCO (2223) superconductor, solid state, pyrolysis, sol-gel.

Y. Tanaka, K. Tokiwa, T. Itoh, E. Harashima, K. Tanaka, A. Iyo, H. Ihara, N. Terada, T. Takimoto, K. Yamaji, H. Bando, and S. K. Agarwal, "A Structure in a Phonon Spectral Function Induced by the Superconductivity." To be published in Physica C. Superconducting Materials Laboratory, Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki 305-8568, JAPAN; e-mail y.tanaka@etl.go.jp.

Seiichi Tokunaga, Yusuke Ohkawa, Katsumi Suzuki, and Youichi Enomoto, "SiO2 Passivation Film Effects on YBCO Junctions." To be published in Physica C (in press). Tsukuba Research Center, Sanyo Electric, 2-1 Koyadai, Tsukuba, Ibaraki 305-0074, JAPAN; telephone +81 298 37 2819; telefax +81 298 37 2836; e-mail tokunaga@tsukuba.rd.sanyo.co.jp. Key words: SiO2 passivation film, YBCO degradation, Josephson junction, annealing, humidity test.

P. Verges, G. Fuchs, S. Gruss, P. Schaetzle, G. Krabbes, K.-H. Mueller, and L. Schultz, "Magnetic Levitation Carrier System Based on Nd-Fe-B Magnets and YBCO Superconductors." Presented at the 15th Int. Workshop on Rare-Earth Magnets and Their Applications, Dresden, Germany, Aug. 30- Sept. 3, 1998. Institut fuer Festkoerper- und Werkstofforschung Dresden, Abt. 21, D-01171 Dresden, GERMANY; telephone +49 351 4659 532; telefax +49 351 4659 537; e-mail p.verges@ifw-dresden.de.

G. Villard, A. Daignere, A. Maignan, and A. Ruyter, "c-Axis Resistivity of Hg-1201 Single Crystals." To be published in J. Appl. Phys. (in press). Contact A. Maignan, Laboratoire CRISMAT, UMR 6508 associee au CNRS, ISMRA et Universite de Caen, 6 Boulevard du Marechal Juin, F-14050 Caen Cedex, FRANCE; e-mail maignan@crismat.ismra.fr.

G. Villard, D. Pelloquin, and A. Maignan, "Structure of New Hg0.75V0.25Ba2CuO4+d Superconducting Single Crystals: Effect of Overdoping on the Magnetization Second Peak." To be published in Physica C. Laboratoire CRISMAT, UMR 6508 associee au CNRS, ISMRA et Universite de Caen, 6 Boulevard du Marechal Juin, F-14050 Caen Cedex, FRANCE; A. Maignan's e-mail maignan@crismat.ismra.fr.

J. Wang, I. Monot, X. Chaud, A. Erraud, S. Marinel, J. Provost, and G. Desgardin, "Fabrication and Characterization of Large-Grain YBa2Cu3O7 Superconductors by Seeded Melt Texturing." To be published in Physica C (in press). Contact I. Monot, Laboratoire CRISMAT, UMR 6508 associee au CNRS, ISMRA et Universite de Caen, 6 Boulevard du Marechal Juin, F-14050 Caen Cedex, FRANCE; telephone +33 231 45 2630; telefax +33 231 95 1600; e-mail ceram@crismat.ismra.fr. Key words: superconductors, melt- texturing, seed, levitation, single grain. 74.60.-w; 81.10.Fq; 81.30.Fb.

W. G. Wang, Z. Han, P. Skov-Hansen, J. Goul, M. Bentzon, P. Vase, and Y.-L. Liu, "High Critical Current Ag and Ag Alloy Sheathed Multifilament Bi-2223 Tapes." Presented at the 1998 Appl. Supercond. Conf. (ASC), Palm Desert, Calif., Sept. 13-18, 1998. Nordic Superconductor Technologies A/S, Prioparken 878, DK-2605 Brondby, DENMARK; telephone +45 4348 2506; telefax +45 4348 2501; e-mail w.wang@nst.com.

H. Weinstock, N. Tralshawala, and J. R. Claycomb, "Nondestructive Evaluation of Wires Using High-Temperature SQUIDs." Preprint #98:084; submitted to Proc. of the 1998 Appl. Supercond. Conf. (ASC), Palm Desert, Calif., Sept. 13-18, 1998. 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.

H. Weinstock, N. Tralshawala, J. R. Claycomb, T. J. Shaw, and J. Clarke, "Defect Detection in Wire Manufacturing." Preprint #98:082; to be published in Review of Progress in Quantitative Nondestructive Evaluation 18, edited by D. O. Thompson and D. E. Chimenti (Plenum Press, New York, 1999). 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.

Hai-hu Wen, Paul Ziemann, Henri A. Radovan, and Thomas Herzog, "On the Magnetization Relaxation of Ring-Shaped Tl2Ba2CaCu2O8 Thin Films as Determined by Superconducting Quantum Interference Device Measurements." To be published in Physica C (in press). Contact Paul Ziemann, Abteilung Festkoerperphysik, Universitaet Ulm, D-89069 Ulm, GERMANY; telephone +49 731 5022970; telefax +49 731 5022987; e-mail paulziemann@physik.uni-ulm.de. Key words: critical current density, flux creep, glassy state, magnetization. 74.60.Ge; 74.60.Jg; 74.72.Fq.

B. Wiedenhorst, H. Berg, R. Gross, B. H. Freitag, and W. Mader, "Structure and Chemical Composition of Planar Defects in Sr0.9La0.1CuO2 Infinite-Layered Superconductors by Electron Spectroscopic Imaging." To be published in Physica C (in press). II. Physikalisches Institut, Universitaet zu Koeln, Zuelpicherstr. 77, D-50937 Koeln, GERMANY; telephone +49 221 470 3541; telefax +49 221 470 5178; e-mail wieden@colorix.ph2.uni-koeln.de. Key words: defect structures, EELS, HREM.

M. Willemin, A. Schilling, H. Keller, C. Rossell, J. Hofer, U. Welp, W. K. Kwok, R. J. Olsson, and G. W. Crabtree, "First-Order Vortex-Lattice Transition in YBa2Cu3O7-d Near the Critical Temperature Detected by Magnetic Torque." Submitted to Phys. Rev. Physik-Institut der Universitaet Zurich, Winterthurerstrasse 190, CH-8057 Zurich, SWITZERLAND; telephone +41 1 635 5774; telefax +41 1 635 5704; e-mail willemin@physik.unizh.ch. 74.25.Bt; 74.25.Ha; 74.60.Ge; 74.72.Bk.

Chien-Jang Wu, "Microwave Properties of a Composite Superconducting Structure in the Mixed State." To be published in Physica C (in press). Department of Electro-Optics Engineering, National Huwei Institute of Technology, Huwei, Yunlin 632, TAIWAN. Key words: mixed state, multilayers, microwave, penetration depth. 74.25.Nf; 74.60.Ge; 74.76.Bz.

Lijun Wu, Yimei Zhu, and M. Suenaga, "Crystallographic Analysis of the Intermediate Phases Observed During the Conversion of (Bi,Pb)2Sr2CaCu2O8+d to (Bi,Pb)2Sr2Ca2Cu3O10+d in Composite Tapes." To be published in Physica C (in press). Department of Applied Science, Brookhaven National Laboratory, Upton, NY 11973; telephone (516) 344- 3057; telefax (516) 344-4071; e-mail zhu@bnl.gov. Key words: crystallographic analysis, composite tapes, Bi/2212, Bi/2223.

W. M. Yang, L. Zhou, Y. Feng, P. X. Zhang, M. Z. Wu, C. P. Zhang, J. R. Wang, Z. H. Du, F. Y. Wang, Z. M. Yu, X. Z. Wu. W. Gawalek, and P. Gornert, "The Effect of Excess Y2O3 Addition on the Levitation Force of Melt Processed YBCO Bulk Superconductors." To be published in Physica C (in press). Contact P. X. Zhang, Superconducting Material Research Center, Northwest Institute for Nonferrous Metal Research, P.O. Box 51, Xi'an, Shaanxi 710016, PEOPLE'S REPUBLIC OF CHINA; telephone +86 29 623 1079; telefax +86 29 623 1103; e-mail pxzhang@mail.xanet.edu.cn. Key words: YBCO superconductors, melt growth, Y2O3, levitation force.

Nobuyuki Yoshikawa, Z. John Deng, Stephen R. Whiteley, and Theodore Van Duzer, "Data-Driven Self-Timed RSFQ Demultiplexer." To be published in Appl. Supercond. (in press). Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya, Yokohama 240, JAPAN.

Shigeru Yoshimori, Kazuhiko Mizushima, Akira Kobayashi, Shu Takei, Yasutaka Uchida, and Mitsuo Kawamura, "Synthesis and AES Analysis of Nb(NbN)-AlN Multilayers by Off-Axial dc Magnetron Sputtering." To be published in Physica C (in press). Takushoku University, 815-1 Tatemachi, Hachioji-shi, Tokyo 193, JAPAN; telephone +81 426 65 1442, ext. 5411; telefax +81 426 63 2159; e-mail yosimori@es.takushoku- u.ac.jp. Key words: Nb(NbN)-AlN multilayers, dc magnetron sputtering, Auger electron spectroscopy.

S. H. Yun, U. O. Karlsson, B. J. Joensson, K. V. Rao, and L. D. Madsen, "Effect of Quenching Temperature on the Growth of a-Axis Oriented HgBa2CaCu2Ox Thin Films." To be published in Superconducting and Related Oxides: Physics and Nanoengineering III, edited by D. Pavuna and I. Bozovic, SPIE Proc. 3481 (SPIE, Bellingham, 1998). Materials Physics, Department of Physics, Royal Institute of Technology, S-100 44 Stockholm, SWEDEN; e-mail yun@matphys.kth.se. Key words: Hg-based cuprate, thin film, rf sputtering, epitaxy, a-axis orientation, pole figure.

X. H. Zeng, H. Soltner, D. Selbig, M. Bode, M. Bick, F. Rueders, J. Schubert, W. Zander, M. Banzet, Y. Zhang, H. Bousack, and A. I. Braginski, "A High-Temperature rf SQUID System for Magnetocardiography." To be published in Meas. Sci. & Technol. Institut fuer Schicht- und lonentechnik (ISI), Forschungszentrum Juelich GmbH, D-52425 Juelich, GERMANY; A. I. Braginski's telephone +49 2461 612330; telefax +49 2461 612333; e-mail alexbrag@isitel1.isi.kfa-juelich.de.

J. X. Zhu, W. K. Kim, C. S. Ting, and C. R. Hu, "Time-Dependent Ginzburg-Landau Equations for Mixed d- and s-Wave Superconductors." Preprint #98:083; to be published in Phys. Rev. B. 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. 74.20.De; 74.20.Mn; 74.60.-w.

Igor Zutic and Oriol T. Valls, "Spin Polarized Tunneling in Ferromagnet/Unconventional Superconductor Junctions." Submitted to Phys. Rev. Lett. School of Physics and Astronomy, University of Minnesota, 116 Church St. S.E., Minneapolis, MN 55455; e-mail izutic@physics.spa.umn.edu; preprint also available at cond- mat@xxx.lanl.gov (#9808285). 74.80.Fp; 74.50.+r; 74.72.-h.

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

*May 18 - 21, 1999: International Magnetics Conference (INTERMAG 99), Hotel Hyundai, Kyongju, Korea. Purpose is to provide a forum for presentation of new developments in applied magnetics, magnetic phenomena and materials, and information storage techniques. Will include sessions on superconductivity, magnetic levitation and propulsion, and microwave and millimeter-wave applications. Contributed papers are solicited in related topics in all areas. Digests must be received by November 24, 1998. For information, contact INTERMAG 99, The Korean Magnetics Society, Rm. 905, The Korea Science and Technology Center, Yeoksam-dong 635-4, Kangnam-ku, Seoul 135-703, Korea; telephone +82 2 967 0518; e-mail intermag@kistmail.kist.re.kr; Web site http://intermag99.kist.re.kr/.

July 11 - 12, 1999: 16th Space Cryogenics Workshop, Quebec City, Canada. Theme will be "Cryogenics for Space Exploration in the Next Millennium," with a focus on the particular technological challenges related to long-term space exploration missions. (This workshop precedes the CEC/ICMC'99 Conference in Montreal.) For information, contact Louis J. Salerno, Chair, 1999 Space Research Workshop, NASA Ames Research Center, Mail Stop 234-1, Moffett Field, CA 94035-1000; telephone (650) 604-3189; telefax (650) 604-0487; e-mail lsalerno@mail.arc.nasa.gov.

*July 12 - 16, 1999: Cryogenic Engineering Conference & International Cryogenic Materials Conference (CEC/ICMC), Hotel Inter-Continental Montreal, Montreal, Quebec, Canada. The CEC focuses on the science and engineering required for cryogenic applications such as liquefied 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. The ICMC focuses on the development, characterization, fabrication, and optimization of the materials used in cryogenic applications, typically broken into two broad categories: structural materials and superconducting materials. ICMC contributions cover both high- and low-temperature superconducting materials from basic materials research through behavior of composite cables and wires in applications. Cryogenic structural materials cover a broad range, including nonmetallic composites, polymeric resins and insulation materials, ferrous alloys, nickel-base alloys, aluminum alloys, and specialized materials for advanced cryocooler applications. Abstract deadline, November 1, 1998 (for mailed submissions) and December 11, 1998 (for Web submissions). For information, contact Centennial Conferences, 4800 Baseline Road, Suite A-112, Boulder, CO 80303; telephone (303) 499-2299; telefax (303) 499-2599; e-mail centennial@orci.com; Web site http://www.cec-icmc.org.

July 17 - 25, 1999: 5th International Summer School and Scientific Workshop, Eger, Hungary. Organized by the SuperTech Consortium, Hungary. The objective of the Workshop is to provide an overview on the basic and up-to-date information on the theories and newest results both in fundamental research and applications of high temperature superconductors. The main framework of the School is a series of tutorial lectures, each of two-hour duration, presented by well-known scientists and experts. The lectures will be published in textbook form, and in addition, proceedings (containing the lectures and the papers of the conference, videos from the lectures, and the social programs) will be available on a CD-ROM. Round-table sessions to be organized after lectures for free discussion. Last two days of the School will be devoted to a scientific conference for participants willing to present results of their work. Abstract deadline, March 1, 1999. For more information, contact Istan Vajda, Department of Electrical Machines and Drives, Technical University of Budapest, H-1111 Budapest, Egry Jozsef u. 18., Hungary; telephone +36 1 463 2961; telefax +36 1 463 3600; e-mail vajda@ntb.bme.hu.

*July 29 - Aug. 2, 1999: International Workshop on Low Temperature Physics in Microgravity Environment (CWS-99), ISSP, Chernogolovka, Moscow Region. Satellite to the LT-22 Conference in Helsinki, Finland (Aug. 4-11, 1999). Topics are: studies in low-temperature and fundamental physics in microgravity environment, equilibrium and critical phenomena in quantum fluids and solids, suspended droplets, laser cooling, relativistic effects, and low-temperature techniques for fundamental studies in space. Number of participants limited to 50. Abstract deadline, March 15, 1999. For information, contact Leonid Mezhov-Deglin, Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Moscow Region, Russia; e-mail mezhov@issp.ac.ru.

*Aug. 4 - 11, 1999: 22nd International Conference on Low Temperature Physics (LT22), Espoo and Helsinki, Finland. Topics will include: quantum gases, fluids and solids; superconductivity; magnetism and lattice properties; quantum electron transport; applications; materials; and techniques. For information, contact Conference Service Bureau, TSG-Congress Ltd., Kaisaniemenkatu 3 B 31, FIN-00100 Helsinki, Finland; telephone +358 9 628044; telefax +358 9 667675; e-mail info@tsgcongress.fi. For technical information, contact the LT22 Office, Low Temperature Laboratory, Helsinki University of Technology, P.O. Box 2200, FIN-02015 HUT; telephone +358 9 451 2962; telefax +358 9 451 2969; e-mail info@LT22.hut.fi; Web site http://lt22.hut.fi/LT22/LT22.html.

Aug. 29 - Sept. 10, 1999: NATO Advanced Study Institute (ASI) on Microwave Superconductivity, The Pyrenees Mountains, Spain. This ASI will cover microwave properties of superconductors, the fabrication and measurement of superconducting devices, circuits which operate at microwave frequencies, and technological issues and market potential of all current and emerging microwave applications. Financial awards are available to some students and recent Ph.D.s who are residents of NATO and selected Eastern European countries. Directors: Martin Nisenoff, NRL and Harold Weinstock, AFOSR. Application deadline, January 15, 1999. For application visit Web site www.geocities.com/Pentagon/Quarters/9088 or contact Sandy Ronayne, 110 Duncan Ave., Bolling AFB, DC 20332-8050; e-mail sandy.ronayne@afosr.af.mil.

RESOURCES

Products and Services

Oxford Instruments has launched the Cryojet nitrogen jet cryostat specifically designed for x-ray crystallography on macromolecule single crystals. Cryojet has no pumps, no moving parts, and therefore minimal servicing requirements. A key factor contributing to the reliability of operation is the absence of room-temperature pumps and fittings from the gas circuit, which ensures that moisture cannot enter the system causing a flow blockage. This is crucial for chemists and biochemists running long experiments to study the physical structure of small molecules and proteins.

Cryojet operates by delivering a constant flow of temperature stabilized nitrogen gas to a nozzle at the Cryojet head. This may be used for flash cooling samples and for maintaining them at a stable, controlled temperature for the duration of a measurement. The liquid nitrogen is supplied to the Cryojet head by controlled evaporation of liquid nitrogen from a dewar. Because it is held at atmospheric pressure, the dewar can be refilled during operation. A second flow of dry nitrogen acts as a shield around the cold jet to prevent ice accumulation on either the nozzle or the sample.

Combining continuous operation, small size, ease of use, and long-term reliability, Cryojet is ideal for crystallographic applications in the growing fields of research in biotechnology and materials science. For further information, contact Anita Cullen, Oxford Instruments Ltd., Old Station Way, Eynsham, Witney, Oxford OX8 1TL, United Kingdom; telephone +44 1189 331331; e-mail enhancemc@compuserve.com.

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High-Tc Update, Vol. 12, #19, October 1, 1998