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

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

NOTA BENE:

Applications

This issue contains an unusually large number of preprints describing advances in applications of the high-temperature superconductors (HTS). Many of these will be included in the proceedings of the 10th International Symposium on Superconductivity (ISS'97), which was held October 27-30, 1997, Gifu, Japan, and was organized by the Superconductivity Research Laboratory (SRL), International Superconductivity Technology Center (ISTEC).

The first large-scale, fully operational HTS physics magnet announced so far for continuous operation has been installed in the Accelerator Mass Spectrometry Laboratory of the Institute of Geological and Nuclear Sciences (IGNS) in Lower Hutt, New Zealand. A preprint by D. M. Pooke (IRL-Lower Hutt) et al. discusses the design, construction, and testing of an ion-beam switching magnet that employs HTS coils. The iron-cored magnet generates a field of 0.72 T using react-and-wind Bi-2223 coils cooled by a single-stage Gifford-McMahon (GM) cryocooler. The magnet has a wide margin of safety in operation at 21 K, but the magnet also has been tested at temperatures up to 47 K.

A paper by K. Sato et al. (Sumitomo Electric) discusses the development of various prototypes for HTS applications, including 14,500 A current leads, a 30 m long power cable, and 4 T and 7 T magnets with inner diameters of 80 mm and room-temperature bores of diameter 50 mm. The magnets, cooled with GM cryocoolers, are intended for operation at about 20 K. Since the specific heat of Bi-2223 at 20 K is about 100 times larger than that of NbTi at 4.2 K, the HTS magnets can be energized very quickly. The 4 T magnet can be ramped to 4 T in 10 s, while the 7 T magnet can be energized to 7 T in about 3 1/2 minutes. Further details about the performance of the 4T and 7 T magnets are given by T. Kato et al. (Sumitomo Electric).

Cables and ac Losses

Initial tests of a 30 m long power cable prototype, consisting of 60 Bi- 2223/Ag multifilamentary wires wound in four layers around a copper pipe, are reported by T. Shibata (Sumitomo Electric) et al. The critical current of the cable at liquid nitrogen temperature was 1,600 A, over the peak value for an rms current of 1 kA. The authors report a successful test of ac voltages and currents of 40 kV and 1 kA in subcooled liquid nitrogen (72 K).

The design of multilayer HTS power cables is discussed in a preprint by J. Fujikami (Sumitomo Electric) et al. The authors determined the pitches of the helical windings of a two-layer cable such that the current in the cable is shared equally between the two layers. The importance of transposing tapes to achieve equal currents in an HTS model cable is stressed in a preprint by A. Kume (Fujikura) et al. The benefits in reduced ac losses by forcing the current to be the same in each layer of a 10-layer cable are discussed in a preprint by S. Mukoyama (Furukawa Electric) et al. Numerical simulations by H. Ishii (Tokyo Electric Power Company) et al. used a numerical simulation code to find that overall losses in a multilayer conductor are reduced if the same current can be made to flow in each layer.

Numerical calculations of the ac transport losses in isolated tapes of rectangular cross section with different aspect ratios have been carried out by T. Fukunaga (Gifu National College of Technology) et al. The authors find that the losses in such tapes are generated mainly at the edges of the tapes.

Measurements of the transport ac losses of Bi-2223 tapes under self- field have been carried out by N. Futaki (Fujikura) et al. The authors investigated the losses of parallel tapes with and without transposition and found that transposition reduced the losses.

The ac losses in stacks of Bi-2223 superconducting tapes subjected to an ac field perpendicular to the wide surface have been investigated by M. Iwakuma (Kyushu) et al. The authors found in this case that the losses can be estimated from a model of a superconducting slab of thickness equal to the tape width.

Trapped-Flux Magnets

The magnetization of melt-processed YBCO bulk superconducting samples (diameter 35.5 mm, thickness 14 mm) using pulsed magnetic fields of various intensities with sample temperatures of 30-84 K has been studied by Y. Yanagi (IMRA Material R&D) et al. The authors found that when a single pulsed field (rise time 5 ms, total duration about 20 ms) was applied to the sample at 35 K, the maximum trapped flux density was limited to 1.42 T. The trapped field increased to 2.1 T when the pulsed fields were repeatedly applied to the sample with decreasing intensity from 7 T. With isothermal field cooling, the maximum trapped flux density was 4 T at 35 K. The difference between the trapped fields in the two cases can be attributed to heat generation during pulsed-field magnetization. On the other hand, flux creep after pulsed-field magnetization was negligibly small compared with that after field cooling.

The dynamics of magnetic flux penetration into melt-processed YBCO during pulsed-field magnetization have been studied by A. Terasaki (Nagoya) et al. using a pick-up-coil technique. The authors were able to monitor both the magnetic flux density B and the vortex velocity v as a function of time and position.

A permanent HTS magnet system combining the simplicity and ease of operation of a ferromagnetic permanent magnet with the strength capability and versatility in field generation of an electromagnet is described by Y. Iwasa (MIT and Keio University). Here permanent means a duration of hours, days, weeks, months, or perhaps years, depending upon the system. The proposed system consists of a cold body in an evacuated space, surrounded by a room-temperature enclosure. The key components of the cold body are (a) an HTS magnet, (b) an optional field-shaping steel yoke, and (c) a heat capacitor.

Other Applications

The magnetic-shielding properties of HTS plates (melt-processed YBCO and Bi-2223) at 77 K have been measured by M. Kojima (Dowa Mining) et al. The frequency dependence of the shielding effect in HTS and copper plates are theoretically compared in a paper by A. Kamitani (Yamagata) et al. The authors find that the shielding coefficient is nearly frequency-independent for HTS plates but strongly frequency-dependent with copper plates.

Calculations of levitation forces between a bulk YBCO sample and a permanent magnet have been carried out by M. Sawamura (Nippon Steel) et al. using 3D numerical analysis codes and compared with experimental levitation forces. The authors used the critical-state model to calculate the magnetic-field distribution in the YBCO sample, accounting for the dependence of Jc upon the angle of B relative to the CuO2 layers.

A new type of fault-current limiter, consisting of a flux-lock reactor with an HTS element and an ac magnetic field coil, is proposed in a preprint by Y.-H. Guo (Nagoya) et al. The elements required for a 6.6 kV-300 A distribution system are estimated.

Thin-Film Devices

The fabrication and characterization of a low-noise, direct-coupled magnetometer based on a 100 pH YBCO dc SQUID on a 10 mm x 10 mm SrTiO3 bicrystal substrate with a 30-degree misorientation angle are reported by J. Beyer (PTB-Berlin) et al. The sensor had a usable voltage swing of 39 microvolts and a white magnetic field noise of 32 fTHz^[-1/2] with a 1/f corner at 2 Hz, including electronics and environmental noise. Measurements of magnetocardiograms demonstrated the suitability of this sensor for biomagnetic applications.

A theoretical analysis of a high-Tc superconducting microstrip resonator has been carried out by G. P. Srivastava et al. (Delhi), using the spectral domain method. The authors derived Fourier transformed impedance Green's functions and calculated the resonant frequencies as a function of the resonator length for three different substrates. The authors found thermal expansion of the substrate to be mainly responsible for the linear shift in the resonant frequency below 0.8 Tc.

A preprint by N. Dieckmann (Hamburg) et al. reports the use of low- temperature scanning electron microscopy (LTSEM) and low-temperature scanning laser microscopy (LTSLM) to analyze local electrical properties of YBa2Cu3O7-d multilayer devices with crossovers. Using both methods, the authors found that the critical current density and critical temperature were reduced at the crossover edges. The authors found complete equivalence between LTSEM and LTSLM, including spatial resolution, temperature dependence, and signal strength.

RBa2Cu3O7-d

The growth of high-Tc samples of Nd1+xBa2-xCu3O7-d (NBCO) single crystals by top-seeded solution growth in air with P(O2) = 0.21 atm is reported by X. Yao (SRL-ISTEC) et al. The crystal grown from a liquid with a Ba/Cu ratio of 0.78 displays an onset Tc = 94.6 K with a sharp transition with Delta[Tc < 1.5 K. The authors find that the Ba-rich liquid suppresses the substitution of Nd on Ba sites, suggesting that the Ba/Cu ratio in the liquid is an important processing parameter for obtaining higher Tc in NBCO. Related preprints by S. I. Yoo et al. (SRL-ISTEC), S.-J. Seo et al. (SRL-ISTEC), S. Matsuoka (SRL-ISTEC) et al., and A. Mase (Nagoya) et al. report on the growth of melt-textured RBa2Cu3O7-d (R = Y, Nd, Sm, or Sm-Gd) superconductors.

According to a preprint by H. A. Blackstead (Notre Dame) et al., microwave surface impedance, neutron diffraction, and electron spin resonance data provide evidence that the magnetic pair-breaking defect associated with Pr in Y1-yPryBa2Cu3O7-d is Pr on the Ba site, not on the rare-earth site. A related paper by H. A. Blackstead (Notre Dame) and J. D. Dow (Arizona State) asserts that comparative studies of RBa2Cu3O7- d and RBa2Cu4O8, with R = (R'1-yPry) and R' = Y, Yb, Nd, or Gd, exclude the possibility that hybridization of Pr 4f states with CuO2-plane O 2p states is responsible for the observed degradation of critical temperatures Tc with increasing Pr content y.

The origin of subgrain formation in melt-grown YBCO has been studied by P. Diko (Kosice) et al. The authors suggest that the subgrains are associated with the dislocation walls formed by the amalgamation of dislocations created at the growth front when Y2BaCuO5 (Y-211) particles are incorporated into the YBa2Cu3O7-d (Y-123) matrix.

The low-temperature specific heat of a high-purity YBa2Cu3O7.00 single crystal grown in a BaZrO3 crucible has been measured by B. Revaz et al. (Geneve) from 1.2 K to 10 K in magnetic fields from 0 to 14 T. The anisotropic contribution, C_[aniso](T,B) = C(T,B||c) - C(T,B perp. to c), which is characteristic of the vortex system, follows the scaling relation predicted for line nodes and d-wave vortices.

The properties of six high-angle grain boundaries in melt-textured YBa2Cu3O7-d superconductors, for which the critical currents are high for three and low for the other three, are reported by G. P. Du et al. (TCSUH). The authors conclude that oxygen distribution at the grain boundaries plays an important role in determining the critical currents.

Local variations in the cation composition along grain boundaries in YBa2Cu3O7-d bicrystals grown by the flux method have been investigated by J. L. Vargas (Wisconsin-Madison) et al. using high-spatial-resolution energy-dispersive x-ray spectroscopy (EDS) in a scanning transmission electron microscope (STEM). The authors conclude that regular variations in boundary nonstoichiometry are a possible origin for one scale of boundary subdivision and may contribute to the heterogeneity of the electromagnetic properties that is believed to occur on a range of different length scales in YBa2Cu3O7-d.

The dimpling of the CuO2 planes in YBa2Cu3Ox (x = 6.806-6.984) has been measured by J. Roehler (Koeln) et al. as a function of x and temperature T by yttrium x-ray extended fine-structure spectroscopy (EXAFS). The dimpling appears to be connected with the transition from the underdoped to the overdoped regimes at x = 6.95, and with a characteristic temperature in the normal state T* ~~ 150 K.

A preprint by A. V. Dooglav (Kazan State) et al. reports a study of the shape of the Cu(2) (plane) NQR spectra in YBa2Cu3O7, TmBa2Cu3O7, and TmBa2Cu4O8 at temperatures 4.2-300 K. The authors present evidence for the existence of two different NQR frequencies between which the Cu(2) nucleus can rapidly jump. The authors suggest that the difference in frequencies may be related to the charge-stripe correlations in CuO2 planes resulting in a dynamical modulation of the electric-field gradients at the Cu(2) nuclei.

Bi Cuprates

A preprint by Ch. Renner (Geneve) et al. presents tunneling spectroscopy of Bi2Sr2CaCu2O8+d (Bi-2212) single crystals as a function of oxygen doping and temperature. The doping dependence amounts essentially to an energy scaling of the tunneling spectra, with a quasiparticle gap that is reduced with increasing oxygen concentration. This superconducting gap is temperature-independent up to the superconducting transition, where the superconducting spectra merge continuously into another gap- like feature at the Fermi level. This pseudogap is found to be present both in underdoped and overdoped samples, and it scales with the superconducting gap.

The relations among the carrier concentration, structure, composition, and Tc have been studied by S. T. Johnson (Edinburgh) et al. using high- resolution x-ray scattering measurements from Bi-2212 single crystals. The authors find evidence for the importance of oxygen ordering.

The effect of an electric field on the migration of Ag and the matrix components of Bi1.6Pb0.4Sr2Ca2Cu3O10+d [(Bi,Pb)-2223] has been studied by T. D. Dzhafarov (Yildiz Technical University) and M. Yilmazlar (Karadeniz Technical University). The authors prepared ceramic samples of (Bi,Pb)-2223, deposited Ag layers on opposite ends of the sample, and then passed a dc electrical current through the Ag/(Bi,Pb)-2223/Ag structure at room temperature for 3-8 days by applying an electric field of 0.8-1.2 kV/m. Afterwards, the distribution of atomic species was determined by energy-dispersive x-ray spectroscopy (EDX). Ag ions were found to electromigrate with an effective charge of q/e = +0.9 +- 0.2. Cu and Sr atoms also were found to migrate in the form of positively charged ions.

Two papers by R. Zeng (Wollongong) et al. explore the effects of cold- working upon the properties of Ag-sheathed Bi-2223 multifilamentary tapes. In one of these, the authors report the development of a deformation procedure that gradually increases the reduction per pass during rolling. With this technique, a uniform stress was achieved within the tapes, which improved both the transverse and longitudinal filament interfacial homogeneity and reduced the sausaging effect. The new procedure resulted in an improved and more uniform Jc in tapes of long length.

Other Cuprates

A superconductivity-induced phonon renormalization effect in (Cu,C)Ba2Ca3Cu4Ox [(Cu,C)-1234, Tc = 117 K], similar to what was observed in HgBa2Ca3Cu4O10+d (Hg-1234), is reported by V G. Hadjiev (MPI-Stuttgart) et al.

The superconducting and weak-ferromagnetic properties of Eu1.4Ce0.6Ru1- xFexSr2Cu2O10-d (x = 0, 0.13, and 0.25) have been studied by E. Felner and U. Asaf (Hebrew University) using dc magnetometry. For x = 0, superconductivity (Tc = 32 K) is found to be confined to the CuO2 planes and magnetic ordering (T_M = 122 K) occurs on the Ru sublattice. With increasing x, Tc is reduced, T_M is enhanced, but other weak- ferromagnetic features are diminished.

Electrical resistivity measurements on single crystals of the electron- doped high-Tc (up to 23 K) superconductor Pr2-xCexCuO4+d over a broad concentration and temperature range are reported by M. Brinkmann et al. (Bochum).

The structure of a Tl- and Ba-based superconductor, Tl0.8(CrO4)0.2Ba2CuO4.2-d, with a Tc of 42 K has been characterized by F. Letouze (Caen) et al.

A preprint by X.-J. Wu et al. (SRL-ISTEC) reports the stacking order and structure of a nonsuperconducting compound, (Hg,Tl)2Ba4Cu2CO3O8, synthesized by a high-pressure technique.

Properties of a new nonsuperconducting cubic compound, EuBa4Cu3O8.5+d (Eu-143), synthesized from precursors Eu2O3, BaO2, and CuO at 1000^oC in an oxygen atmosphere are reported by Y. T. Zhu et al. (Los Alamos).

Thin Films

As reported by F. Miletto Granozio (Napoli and Grenoble) et al., twin- free (110) YBCO films have been grown by pulsed laser deposition on vicinal (110) SrTiO3 substrates using a double PBCO template layer. The authors stress that such samples offer a unique opportunity to analyze the physics of the tetragonal-orthorhombic transition and of strain relaxation, and to investigate fine details of the film-substrate alignment.

The universal behavior of the continuous superconducting (glass) transition in a YBa2Cu3O7-d thin film has been studied by K. Moloni et al. (Purdue). A new analysis technique for determining the glass scaling exponents, z_g and nu_g, and the glass transition temperature T_g(H) has been developed, which yields z_g = 3.8 +- 0.2 and nu_g = 1.8 +- 0.1. With these values, the data are scaled for fields in the range 1-9 T. From this scaling, the authors find support for 3D XY multicritical scaling theory.

The growth of thin films of Sr2CuO2(CO3) obtained by annealing thin films of the parent infinite-layer compound Sr2CuO2 at 700^oC in air is reported by K.-W. Chang (Northwestern) et al. The precursor Sr2CuO2 films were grown by metal-organic chemical vapor deposition. The transport properties showed metal-like resistivity, with a superconducting onset at 30 K and zero resistance at 9 K.

Vortices

A state-of-the-art scanning Hall probe microscope has been used by A. Oral (Bath) et al. to investigate the vortex lattice melting transition in high-quality Bi2Sr2CaCu2O8+d (Bi-2212) crystals with single-vortex resolution. At low applied magnetic fields, repeating striped regions (~10 micrometer wide) of strong pinning sites were observed parallel to one of the in-plane crystallographic axes, which persisted almost up to Tc. At higher fields, these regions were found to modulate the local induction profile and lead to the formation of an intermediate state of coexisting solid and liquid stripes through the melting transition. In studies with high spatial resolution, the authors observed pronounced rotations of the hexagonal vortex structure as the field was raised towards the melting line. An abrupt discontinuous loss of vortex amplitude at the melting field is indicative of a first-order phase transition, yet a pronounced downturn in amplitude as it is approached from below is suggestive that two different physical mechanisms may be important.

The vortex phase diagram for the highly anisotropic high-Tc superconductor Bi-2212 when columnar defects are introduced by heavy-ion irradiation has been computed by R. Sugano and T. Onogi (Hitachi) using Monte Carlo simulations based on the Lawrence-Doniach model. At finite temperatures, the authors numerically find a new magnetic-field-driven discontinuous transition (in the trapping rate of pancake vortices by defects) at a critical field of B/B_[phi], where B_[phi] is the matching field. A strong collaboration between the repulsive vortex-interaction energy and the entropy gain for different pancake vortex configurations is crucial to this transition.

A preprint by M. Friesen and P. Muzikar (Purdue) reports the use of the Ginzburg-Landau equations to determine the order parameter and magnetic field of a vortex line pinned at a single point defect.

Destruction of the vortex lattice by random point pinning is theoretically considered by A. E. Koshelev and V. M. Vinokur (Argonne) as a mechanism for the second-peak transition observed experimentally in weakly coupled layered high-temperature superconductors. The authors find that the transition field separating the topologically ordered quasilattice from the amorphous vortex configuration is strongly influenced by the layered structure and by the nonlocal nature of the vortex tilt energy due to the magnetic interlayer coupling. The authors found three different regimes of transition depending on the relative strength of Josephson and magnetic couplings. The regimes can be distinguished by the dependence of the transition field upon the superconducting parameters and pinning strength.

Two papers by J. Shiraishi (Tokyo) et al. report theoretical studies of the vortex state in a magnetic field parallel to the c axis. Using extended Ginzburg-Landau theory, the authors find that the vortex-core structure acquires a fourfold modulation proportional to cos4phi, where phi is the angle r makes with the a axis. This term favors a square vortex lattice tilted by 45 degrees from the a axis. The authors calculate the critical field at which the vortex lattice makes a first- order transition to a square lattice and the magnetization diverges.

Theory

A singlet-triplet model for the cuprates is introduced in a preprint by A. S. Moskvin and A. S. Ovchinnikov (Ural State University). The authors suggest that this model provides a promising foundation for the qualitative and semiquantitative analysis of the static and dynamic spin properties of the cuprates, including paramagnetic susceptibility, nuclear resonance, and inelastic neutron scattering.

As noted by D. E. Sheehy and P. M. Goldbart (Illinois-Urbana), the topological structure of the order parameter in Zhang's SO(5) theory of superconductivity allows for an unusual type of dissipation mechanism by which current-carrying states can decay. The authors consider a thin superconducting wire and calculate the resistivity due to this mechanism, which involves orientation rather than amplitude order- parameter fluctuations.

A preprint by K. Maki and E. Puchkaryov (USC) notes the remarkable asymmetry between the effects of Ni and Zn substitution in the hole- doped high-Tc cuprates and the electron-doped ones. The authors propose that Ni substitution for Cu in the electron-doped high-Tc cuprates should be described by the Abrikosov-Gor'kov theory of magnetic impurities in s-wave superconductors. They note, in particular, that the low-temperature magnetic penetration depth should tell if the pure magnetic-scattering limit applies.

The question of whether the electron-phonon interaction can support a d- wave gap anisotropy has been investigated by O. Jepsen et al. (MPI- Stuttgart). On the basis of models derived from LDA calculations, as well as LDA linear-response calculations, the authors argue that this is indeed possible for materials with buckled or dimpled CuO2 planes for the buckling modes, which involve out-of-plane movements of the CuO2- plane oxygen atoms.

Using the t-J model, A. Yu. Zavidonov and D. Brinkmann (Zurich) have derived a new expression for the dynamic spin susceptibility of CuO2 planes in high-temperature superconductors taking into account the effects of antiferromagnetic correlations between copper spins. The authors also investigate the evolution of the antiferromagnetic correlation length with doping.

The fluctuation-exchange (FLEX) approximation for interaction electrons has been applied by G. Esirgen and N. E. Bickers (UC-Santa Barbara and USC) to study instabilities in the standard three-band model for CuO2 layers in the high-temperature superconductors. The authors report that this approximation provides reasonable results for both the magnitude and the doping dependence of the d_[x^2-y^2] transition temperature in the overdoped regime.

A preprint by M. Guerrero (Los Alamos) et al. reports simulations of the three-band Hubbard model using the constrained-path Monte Carlo method to search for a possible superconducting ground state. The authors found that holes bind for a wide range of parameters and that the binding increases as the system size is increased, but that the pairing correlation functions decay quickly with distance. The authors found trends for the three-band model that are similar to those found for the one-band Hubbard model, but they report that the additional degrees of freedom in the three-band model evidently do not enhance superconductivity in an obvious way.

A model for high-temperature superconductors based on the idea of Cooper pairs composed of electrons from different bands has been proposed by J. Tahir-Kheli (First Principles Research). The author proposes that optimal doping with the highest Tc occurs when the two relevant bands cross in the vicinity of the Fermi level. A related paper by J. K. Perry and J. Tahir-Kheli (First Principles Research) applies this model to analyze the band crossing in La2-xSrxCuO4. The authors also extend their conclusions to the behavior of YBa2Cu3O7-d with doping.

A simple phenomenological form for the self-energy has been introduced by M. R. Norman (Argonne) et al., which allows the authors to extract important information from angle-resolved photoemission data on Bi-2212. First, the authors find a rapid suppression of the single-particle scattering rate below Tc for all doping levels. Second, they find that in the overdoped materials the gap parameter Delta at all k points on the Fermi surface has significant temperature dependence and vanishes near Tc, while in underdoped samples, such behavior is found only at k points close to the diagonal. Near (pi,0), Delta is nearly T- independent in the underdoped samples.

The tunneling spectrum into a d-wave superconductor with a time- reversal-symmetry-broken surface state has been investigated by J. X. Zhu and C. S. Ting (TCSUH). The authors use a Blonder-Tinkham-Klapwijk scattering formalism and solve the Bogoliubov-de Gennes equations to calculate the splitting of the zero-bias conductance peak.

Spontaneous magnetic flux generated in a doubly connected s-wave/normal metal/d-wave superconductor (SND) Josephson junction is considered in a preprint by A. M. Zagoskin and M. Oshikawa (UBC). The authors find that the flux magnitude is not quantized. In an isolated system, quantum fluctuations of the superconducting phase take place, leading to quantum flux noise. The authors discuss possibilities for experimental observation of this effect.

The magnetic interference patterns of Josephson junctions with regions of 0 and pi phase shift have been investigated by D. F. Agterberg (ETH- Zurich) and M. Sigrist (ETH-Zurich and Kyoto). Such junctions recently were realized as c-axis YBCO-Pb junctions with a single twin boundary in YBCO. The authors show that in general the junction generates self- fields, which introduce an asymmetry in the critical current under reversal of the magnetic field. The authors present numerical calculations of these asymmetries, which account well for previously unexplained features observed in single twin boundary junctions.

Other Activities

The evolution of magnetic and superconducting fluctuations in YBa2Cu3O7- d and Bi2Sr2CaCu2O8+d with doping, as revealed by electronic Raman scattering, is discussed in a preprint by G. Blumberg (Illinois-Urbana and Tallinn) et al. For underdoped superconductors, the authors conclude that short-range antiferromagnetic (AF) correlations persist with hole doping and that doped single holes are incoherent in the AF environment.

A preprint by H. A. Blackstead (Notre Dame) and J. D. Dow (Arizona State) presents evidence that the superconductivity in NdBa2Cu3O7, Nd2- xCexCuO4, and Nd2-zCezSr2Cu2NbO10 is different, has different origins, and is associated with oxygen in the charge reservoirs.

Review

An article reviewing the relationships between structure and properties for a series of layered Pb-containing superconducting cuprates from the research viewpoint of solid-state chemists or materials physicists has been prepared by T. P. Beales (MM Cables). The author considers the 0211, 1201, 1212, 1222, and 2213 structures containing (Pb,M)O layers (M = Cu, Mg, Ca, Sr, Sc, Cd, Zn, Sb, In, Bi, Tl, Hg, V) and their derivatives with an emphasis on the general physiochemical relationships observed between crystal structure, allovalent ion chemical substitution, materials processing, and optimization of superconductivity. (142 refs.)

Ph.D. Thesis

As noted in the Florida State Ph.D. thesis of K. M. Amm, Re, Bi, and Pb stabilize the formation of the Hg-1223 phase (HgBa2Ca2Cu3O8+d) without significantly reducing Tc. In this thesis, the author investigated the influence of these three dopants on phase evolution through quench experiments, x-ray analysis, microstructural analysis, and magnetization studies. A method for the synthesis of the Hg-1223 phase from commercial precursors was developed. The author also investigated the influence of interfaces with Ag, AgPd, Au, and AgHg upon phase evolution, grain growth, and magnetic properties of Hg-1223.

Contributed by John R. Clem

Contents: Technology News is on page 7; Preprints begin on page 7; and Coming Events are on page 15.

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

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

This section describes progress in manufacturing, product development, and technology transfer in the high-Tc superconductivity field. Please send your contributions (product development information, news regarding technology transfer efforts, or any information you would like to share about your corporation or laboratory) to the editor.

Scientists and engineers at Advanced Ceramics Development, a division of UniQuest Ltd. (Brisbane, Australia), have developed a semi-automated instrument for the production of precursor Bi-2223 powders. The instrument utilizes a robust but complex chemical precipitation process to produce precursor powders of high quality and phase purity (>99.9%) and low carbon content (<200 ppm). The project for development of the first prototype instrument was funded by Enya Systems Ltd. (Fussa, Japan) as part of a staged, R&D driven entry into the development of new Japanese markets.

This new prototype instrument for production of precursor Bi-2223 powders is aimed primarily at the low-volume R&D market or for PIT tape production facilities with a requirement for reproducible quality powders over a series of tape runs. The maximum capacity for the prototype instrument is currently ~250 g per twelve hours with up to six runs before top-up chemicals are required. The instruments' modular design and integration of user-friendly software allows for minimal set- up and maintenance costs and the instrument is currently undergoing final commissioning trials prior to shipment to Enya Systems, who already have strong interest from third-party purchasers in Japan. Final testing and shakedown runs will be undertaken in Japan early in 1998 as part of a planned marketing drive in the region.

Scientists at Advanced Ceramics Development consider that extension of the instrumentation to other compositional suites or to other scales are achievable now that fundamental processing issues have been solved. A fully automated instrument for precursor Bi-2223 powders is also in the planning stages. For information, contact Ian D. R. Mackinnon, Advanced Ceramics Development, The University of Queensland, St. Lucia Qld 4072, Australia; telephone +61 7 3365 7907; telefax +61 7 3365 7093; e-mail i.mackinnon@mailbox.uq.edu.au.

Contributed by Sreeparna Mitra

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

A. M. Abakumov, V. L. Aksenov, V. A. Alyoshin, E. V. Antipov, A. M. Balagurov, D. A. Mikhailova, S. N. Putilin, and M. G. Rozova, "Effect of Fluorination on the Structure and Superconducting Properties of the Hg- 1201 Phase." Preprint #E14-97-234. Department of Chemistry, Moscow State University, 119899 Moscow, RUSSIA.

D. F. Agterberg and M. Sigrist, "Asymmetric Magnetic Interference Patterns in 0-pi Josephson Junctions." Theoretische Physik, ETH Hoenggerberg, CH-8093 Zurich, SWITZERLAND; telephone +41 1 633-2575 or -2570; telefax +44 1 633-1115; e-mail daniela@itp.ethz.ch; preprint also available at cond-mat@xxx.lanl.gov (#9711157). 74.20.Mn; 74.25.Bt.

E. Altshuler and R. Mulet, "The Azimuthal Critical State of a Superconducting Hollow Cylinder." To be published in Physica C (in press). Superconductivity Laboratory, IMRE-Physics Faculty, University of Havana, La Habana 10400, CUBA; e-mail jea@informed.sld.cu. Key words: type-II superconductors, magnetization, pinning, critical current density.

Kathleen Melanie Amm, "Synthesis and Properties of Mercury Cuprate Superconductors with Metallic Interfaces." Submitted as a Ph.D. thesis (Florida State University). Contact Justin Schwartz, National High Magnetic Field Laboratory and Department of Mechanical Engineering, Florida State University, 1800 E. Paul Dirac Drive, Tallahassee, FL 32310; telephone (850) 644-0874; telefax (850) 644-0867; e-mail schwartz@magnet.fsu.edu.

C. Andreouli and A. Tsetsekou, "Synthesis of HTSC Re(Y)Ba2Cu3Ox Powders: The Role of Ionic Radius." To be published in Physica C (in press). Contact A. Tsetsekou, CERECO S.A., P.O. Box 146, 34100 Chalkida, GREECE; telephone +30 262 71226; telefax +30 262 71461. Key words: ReBa2Cu3Ox phases, solid-state reaction, DTA analysis, x-ray diffraction analysis, reaction sequence, calcination conditions.

H. Aubin, K. Behnia, S. Ooi, and T. Tamegai, "Comment on 'Plateaus Observed in the Field Profile of Thermal Conductivity in the Superconductor Bi2Sr2CaCu2O8.'" Contact K. Behnia, Laboratoire de Physique des Solides (CNRS), Universite Paris-Sud, Batiment 510, F-91405 Orsay Cedex, FRANCE; telefax +33 1 69 15 60 86; e-mail kamran@lps.u- psud.fr.

T. P. Beales, "Properties and Substitutional Chemistry of Layered Lead Cuprate Superconductors." To be published in J. Mater. Chem. Metal Manufactures Ltd., High Temperature Superconductor Facility, Australian Technology Park, Eveleigh NSW 1430, AUSTRALIA; telephone +61 2 9209-4220 or -4221; telefax +61 2 9209-4222. Key words: feature article, superconductivity, lead-cuprate superconductor, high-temperature superconductivity.

Jorge Berger and Jacob Rubinstein, "Passage of Vortices Through Mesoscopic Superconducting Loops." Department of Physics, Technion, 32000 Haifa, ISRAEL; e-mail phr76jb@aluf.technion.ac.il; preprint also available at cond-mat@xxx.lanl.gov (#9711043).

J. Beyer, D. Drung, F. Ludwig, T. Minotani, and K. Enpuku, "Low Noise YBa2Cu3O7-x Single Layer dc SQUID Magnetometer Based on Bicrystal Junctions with 30 degree Misorientation Angle." To be published in Appl. Phys. Lett. Physikalisch-Technische Bundesanstalt, Abbestrasse 2- 12, D-10587 Berlin, GERMANY; telephone +49 30 3481 379; telefax +49 30 3481 490; e-mail joern.beyer@ptb.de.

Howard A. Blackstead, Jason C. Cooley, John D. Dow, W. Larry Hults, S. K. Malik, David B. Pulling, James L. Smith, and William B. Yelon, "Evidence of Pair Breaking by Pr(Ba) in Y1-yPryBa2Cu3O7." To be published in J. Phys. Chem. Solids. Department of Physics, University of Notre Dame, Notre Dame, IN 46556; telephone (219) 631-7078; telefax (219) 631-5952; e-mail blackstd@rems1.phys.nd.edu. Key words: superconductivity, rare earths, PrBa2Cu3O7. 74.20.Fg.

Howard A. Blackstead and John D. Dow, "Evidence of an Atomistic Universal Structural Entity for High-Temperature Superconductivity." To be published in J. Appl. Phys. Department of Physics, University of Notre Dame, Notre Dame, IN 46556; telephone (219) 631-7078; telefax (219) 631-5952; e-mail blackstd@rems1.phys.nd.edu. Key words: superconductivity, Nd1.85Ce0.15CuO4, Nd2-zCezSr2Cu2NbO10. 74.25.-q; 74.72.Jt; 74.20.De.

Howard A. Blackstead and John D. Dow, "Hybridization in PrBa2Cu3O7 and PrBa2Cu4O8." To be published in Phys. Rev. B. Department of Physics, University of Notre Dame, Notre Dame, IN 46556; telephone (219) 631- 7078; telefax (219) 631-5952; e-mail blackstd@rems1.phys.nd.edu. Key words: superconductivity, Pr123, Pr124, rare earths, hybridization. 74.20.Fg.

G. Blumberg, M. V. Klein, and S.-W. Cheong, "Charge and Spin Dynamics of an Ordered Stripe Phase in La12/3Sr1/3NiO4 by Raman Spectroscopy." To be published in Phys. Rev. Lett. Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, IL 61801- 3080; telephone (217) 244-8038; telefax (217) 244-8544; e-mail blumberg@uiuc.edu; preprint also available at cond-mat@xxx.lanl.gov (#9711139). 71.45.Lr; 75.30.Fv; 71.38.+i; 74.72.Dn; 78.30.Er; 74.25.Ha.

G. Blumberg, M. V. Klein, K. Kadowaki, C. Kendziora, P. Guptasarma, and D. Hinks, "Evolution of Magnetic and Superconducting Fluctuations with Doping of High-Tc Superconductors: An Electronic Raman Scattering Study." To be published in J. Phys. Chem. Solids: Proc. of the Conf. on Spectroscopies in Novel Supercond. (SNS'97), Cape Cod, Mass., Sept. 14-18, 1997. Department of Physics, Loomis Laboratory of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, IL 61801-3080; telephone (217) 244-8038; telefax (217) 244-8544; e-mail blumberg@uiuc.edu; preprint also available at cond- mat@xxx.lanl.gov (#9711073).

Matthias Brinkmann, Heinrich Bach, and Kurt Westerholt, "Electrical Resistivity Study of Metallic Pr2-xCexCuO4+d Single Crystals Over a Broad Concentration and Temperature Range." To be published in Physica C (in press). Contact Kurt Westerholt, Institut fuer Experimentalphysik/Festkoerperphysik, Ruhr-Universitaet Bochum, D-44780 Bochum, GERMANY; telephone +49 234 7003 621; telefax +49 234 709 4173. Key words: electron-doped high-Tc superconductors, transport properties, 3D-metal substitution, high-temperature measurements. 74.72.-h; 74.25.-q; 74.25.Fy; 74.62.Dh.

K.-W. Chang, B. W. Wessels, D. B. Studebaker, T. J. Marks, J. L. Schindler, C. R. Kannewurf, M. Aprili, and L. Greene, "Growth and Properties of Sr2CuO2(CO3) Thin Films Prepared from Metal-Organic Chemical Vapor Deposition-Derived Precursor Films." To be published in Physica C (in press). Contact B. W. Wessels, Science and Technology Center for Superconductivity, Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208; telephone (847) 491-3537; telefax (847) 491-7820. Key words: chemical vapor deposition, infinite-layer compound, oxycarbonate superconducting film, oxygen annealing, transport properties. 74.25.Fy; 74.76.Bz; 81.15.Gh.

Xiaojia Chen and Zhengkuan Jiao, "Nonhomogeneous Pressure Effects on Tc in HgBa2Ca2Cu3O8+d." To be published in Physica C (in press). Department of Physics, Zhejiang University, Hangzhou 310027, PEOPLE'S REPUBLIC OF CHINA; telefax +86 571 595 1358; e-mail phy_zhangxj@zunet.ihep.ac.cn. 74.72.Gr; 74.80.Dm; 74.62.Fj.

John R. Clem, "ac Losses in High-Tc Materials." Presented at the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Ames Laboratory-USDOE and Department of Physics, Iowa State University, Ames, IA 50011-3020; telephone (515) 294-4223; telefax (515) 294-0689; e-mail clem@ameslab.gov. Key words: ac losses, magnetic losses, transport losses, vortex penetration, weak links, surface impedance.

M. Corti, K. Nehrke, F. Tabak, B. N. Wani, and L. L. Miller, "[19]^F NMR as a Probe of Flux-Line Motion in Fluorinated YBa2Cu4O8." To be published in Physica C (in press). Department of Physics, "A. Volta", Unita INFM and Sezione INFN, Via Bassi 6, I-27100 Pavia, ITALY; telephone +39 382 507 466; telefax +39 382 507 563; e-mail corti@pavia.pv.infn.it. 74.60.Ge; 74.25.Nf; 74.72.Gr; 76.60.Es.

N. Dieckmann, S. Friemel, A. Bock, U. Merkt, R. Gerber, and R. P. Huebener, "Equivalence of LTSLM and LTSEM Analyses: Study of a YBa2Cu3O7 Multi-Layer Device." To be published in Physica C (in press). Institut fuer Angewandte Physik und Zentrum fuer Mikrostrukturforschung, Universitaet Hamburg, Jungiusstrasse 11, D-20355 Hamburg, GERMANY; telephone +49 40 4123 4202; telefax +49 40 4123 4368; e-mail dieckmann@physnet.uni-hamburg.de. 61.16.Bg; 74.76.Bz; 85.25.-j.

P. Diko, S. Takebayashi, and M. Murakami, "Origin of Subgrain Formation in Melt-Grown Y-Ba-Cu-O Bulks." To be published in Physica C. Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04353 Kosice, SLOVAKIA.

A. V. Dooglav, A. V. Egorov, E. V. Krjukov, Yu. A. Sakhratov, M. A. Teplov, and Yunhui Xu, "Shape of the Cu(2) NQR Spectra in YBa2Cu3O7, TmBa2Cu3O7 and TmBa2Cu4O8." Submitted to JETP Lett. Contact M. A. Teplov, Kazan State University, 420008 Kazan, Tatarstan, RUSSIA; e-mail mikhail.teplov@ksu.ru. 61.72.Hh; 74.72.Bk; 74.80.-g; 76.60.Gv.

G. P. Du, M. K. Mironova, S. Sathyamurthy, and K. Salama, "An Investigation on High-Angle Grain Boundaries in Melt-Textured YBa2Cu3O6+x Superconductors." Preprint #97:139; submitted to Physica C. Contact K. Salama, Texas Center for Superconductivity and Department of Mechanical Engineering, University of Houston, Houston, TX 77204-4792; telephone (713) 743-4514; telefax (713) 743-4513; preprint also available from Texas Center for Superconductivity, telephone (713) 743- 8200; telefax (713) 743-8201; e-mail preprints@www.tcs.uh.edu. Key words: YBa2Cu3O6+x, critical current density, high-angle grain boundaries, strong coupling, weak coupling.

T. D. Dzhafarov and M. Yilmazlar, "The Effect of Ag Electromigration on the Properties of BiPbSrCaCuO Superconductors." To be published in Physica C (in press). Institute of Physics, Azerbaijan Academy of Sciences, 370143 Baku, AZERBAIJAN.

I. Eremin, "Non-Fermi Liquid Correction to Uniform Spin Susceptibility of Singlet Band Below Tc." To be published in Solid State Commun. Department of Theoretical Physics, Kazan State University, 420008 Kazan, RUSSIA; e-mail ilya.eremin@ksu.ru. Key words: high-Tc superconductors, phase transitions.

I. Eremin and M. Eremin, "CDW as a Possible Reason for the Pseudogap in the Normal State of High-Tc Cuprates." To be published in J. Supercond. Department of Theoretical Physics, Kazan State University, 420008 Kazan, RUSSIA; e-mail ilya.eremin@ksu.ru. Key words: charge denisty waves, superexchange interaction, pseudogap.

Goekhan Esirgen and N. E. Bickers, "Fluctuation Exchange Analysis of Superconductivity in the Standard Three-Band CuO2 Model." To be published in Phys. Rev. B. Institute for Theoretical Physics, University of California, Santa Barbara, CA 93106-4030; e-mail esirgen@fuji.csp.uga.edu; preprint also available at cond- mat@xxx.lanl.gov (#9711151). 71.10.+x; 71.20.Ad.

I. Felner and U. Asaf, "Superconductivity and Weak Ferromagnetism in Eu1.4Ce0.6Ru1-xFexSr2Cu2O10-d." To be published in Physica C (in press). Racah Institute of Physics, Hebrew University, Jerusalem 91904, ISRAEL; telephone +972 2 658 5752; telefax +972 2 658 6347; e-mail israela@vms.huji.ac.il.

I. Felner, U. Asaf, S. D. Goren, and C. Korn, "Reversible Effect of Hydrogen on Superconductivity and Weak Ferromagnetism in Eu1.4Ce0.6M Sr2Cu2O10-d (M=Nb and Ru)." To be published in Phys. Rev. B. Racah Institute of Physics, Hebrew University, Jerusalem 91904, ISRAEL; telephone +972 2 658 5752; telefax +972 2 658 6347; e-mail israela@vms.huji.ac.il. 74.10.+v; 74.62.Bf; 75.50.Ee; 76.80.+y.

Mark Friesen and Paul Muzikar, "Order Parameter and Magnetic Field of a Vortex Line Pinned at a Point Defect: Ginzburg-Landau Theory." To be published in Phys. Rev. B. Department of Physics, Purdue University, 1396 Physics Building, West Lafayette, IN 47907-1396; telephone (765) 494-3045; telefax (765) 494-0706; e-mail friesen@physics.purdue.edu; preprint also available at cond-mat@xxx.lanl.gov (#9711128). 74.20.De; 74.60.Ge.

Jun Fujikami, Munetsugu Ueyama, Nobuhiro Saga, Toshikazu Shibata, Kazuya Ohmatsu, Kazuhiko Hayashi, Shigeki Isojima, Ken-ichi Sato, Hideo Ishii, Shoichi Honjo, and Yoshihiro Iwata, "Development of HTS Cable Conductor with Multi-Layer Structure." To be published in the Proc. of the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Sumitomo Electric Industries, 1-1-3 Shimaya, Konohana-ku, Osaka 554, JAPAN. Key words: cable, alloy, mechanical strength, pitch, ac loss.

Tetsuya Fukunaga, Ryoji Inada, and Akio Oota, "Influence of Form and Arrangement of Superconductor on ac Transport Losses of High Tc Superconducting Wires and Cables." To be published in the Proc. of the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Gifu National College of Technology, Shinsei-cho, Motosu-gun, Gifu 501- 04, JAPAN. Key words: ac loss, self field, superconductor tape, cable conductor.

Naohiro Futaki, Shigeo Nagaya, Atsushi Kume, Nobuyuki Sadakata, Takashi Saitoh, and Osamu Kohno, "Influence of the Surface Conditions to the ac Losses of Layered Ag-Sheathed Bi-2223 Conductor." To be published in the Proc. of the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Fujikura Ltd., 1-5-1 Kiba, Koto-ku, Tokyo 135, JAPAN. Key words: Bi-2223 Ag-sheathed tape, layer resistance, ac loss, transposed segment.

Y. Ge, S. Y. Ding, Q. Ding, C. Ren, L. Qiu, F. Y. Ling, X. X. Yao, Y. X. Fu, and C. B. Cai, "Harmonic ac Susceptibilities for Textured YBa2Cu3O7." To be published in Physica C (in press). Contact S. Y. Ding, Department of Physics, National Laboratory of Solid State Microstructures, Nanjing University and Center for Advance Studies in Science and Technology of Microstructures, Nanjing 210093, PEOPLE'S REPUBLIC OF CHINA; telephone +86 25 359 4023; telefax +86 25 330 0535; e-mail syding@netra.nju.edu.cn.

Paul M. Goldbart, "Antiferromagnetic Hedgehogs with Superconducting Cores." Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801; e-mail paul@paul.physics.uiuc.edu; preprint also available at cond- mat@xxx.lanl.gov (#9711088). 74.20.De; 74.25.Dw; 74.25.Ha; 75.50.Ee.

F. Miletto Granozio, F. Ricci, U. Scotti di Uccio, and J. C. Villegier, "Orthorhombic-Tetragonal Transition in Twin Free (110) YBCO Films." To be published in Phys. Rev. B. Dipartimento di Fisica, Universita Federico II di Napoli, P. le Tecchio 80, I-80125 Napoli, ITALY; telephone +39 81 768 2423; telefax +39 81 239 1821; e-mail miletto@na.infn.it.

M. Guerrero, J. E. Gubernatis, and Shiwei Zhang, "Quantum Monte Carlo Study of Hole Binding and Pairing Correlations in the Three-Band Hubbard Model." Submitted to Phys. Rev. B. Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545; e-mail mgs@heidrun.lanl.gov; preprint also available at cond-mat@xxx.lanl.gov (#9711125). 74.10.+v; 74.20.-z; 71.10.Fd; 71.10.-w; 02.70.-c.

Yu-Hong Guo, Toshiyuki Uchii, Yasunobu Yokomizu, Toshiro Matsumura, and Norimitsu Murayama, "A Conceptual Design of Superconducting Fault Current Limiter with Bi-2223 in 6.6 kV Distribution System." Presented at the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-01, JAPAN. Key words: flux-lock type fault current limiter (FLT-FCL), distribution system, HTS element, required number, joule heat.

V. G. Hadjiev, M. Cardona, Z. L. Du, Y. Y. Xue, and C. W. Chu, "Superconductivity-Induced Phonon Renormalization in (Cu,C)Ba2Ca3Cu4Oz Superconductor." Preprint #97:137; submitted to Physica Status Solidi. Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse 1, D- 70569 Stuttgart, GERMANY; preprint also available from 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.

Damian P. Hampshire, "Magnetic and Transport Measurements of the Irreversibility Field." Presented at the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Superconductivity Group, Department of Physics, University of Durham, South Road, Durham DH1 3LE, UNITED KINGDOM; telephone +44 191 374-2167 or -2000; telefax +44 191 374-3749. Key words: irreversibility field, Chevrel, weak link.

Hideki Haneda, Takehiko Ishiguro, Satoshi Watauchi, Jun-ichi Shimoyama, and Kohji Kishio, "Anomaly in the Coupling Between Electromagnetic and Acoustic Waves in Bi2Sr2CaCu2O8 Single Crystal." To be published in the Proc. of the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-01, JAPAN; e-mail haneda@ss.scphys.kyoto-u.ac.jp. Key words: Josephson vortex, intrinsic pinning, mutual conversion between electromagnetic and acoustic waves, Bi2Sr2CaCu2O8.

Takamitsu Higuchi, Sang-Im Yoo, Koichiro Waki, Hiroyuki Fujimoto, and Masato Murakami, "Nd1+xBa2-xCu3O7-d Single Crystals Flux-Grown at Various Undercoolings and Their Superconducting Properties." Presented at the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Railway Technical Research Institute, 2-8-38 Hikari-cho, Kokubunji-shi, Tokyo 185, JAPAN. Key words: Nd123 single crystal, OCMG, crystal growth, flux method, undercooling.

*Takashi Hikihara, Hitoshi Adachi, Shunsuke Ohashi, Yoshihisa Hirane, and Yoshisuke Ueda, "Levitation Drift of Flywheel and HTSC Bearing System Caused by Mechanical Resonance." To be published in Physica C (in press). School of Electrical Engineering, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-01, JAPAN; telefax +81 75 751 1576; e-mail hikihara@kuee.kyoto-u.ac.jp. Key words: HTSC bearing, flywheel, mechanical resonance, gyroscopic motion, drift. 74.90.+n; 62.40.+i. *Revised contact information.

Tsuneo Ichiguchi, "Vortex Cyclotron Resonance in High-Tc Superconductors." To be published in Phys. Rev. B. Advanced Research Laboratory, Hitachi Ltd., Hatoyama, Saitama 350-03, JAPAN. 74.25.Nf; 74.60.-w; 74.72.Hs.

Takekazu Ishida, Kiichi Okuda, Hidehito Asaoka, Yukio Kazumata, Kenji Noda, and Humihiko Taketi, "Vortex Pinning and Irreversibility Line in Single Crystal YBa2Cu3O7 with Parallel Twin Boundaries." Presented at the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Department of Physics and Electronics, Osaka Prefecture University, Sakai, Osaka 599-8531, JAPAN. Key words: YBa2Cu3O7, single crystal, twin boundary, torque magnetometry, irreversibility line.

Takekazu Ishida, Kiichi Okuda, Alexandre I. Rykov, Setsuko Tajima, and Ichiro Terasaki, "Vortex Lattice Melting in Untwinned Single Crystal YBa2Cu3O7 When Fields Are Applied Parallel to CuO2 Plane." Presented at the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Department of Physics and Electronics, Osaka Prefecture University, Sakai, Osaka 599-8531, JAPAN. Key words: YBa2Cu3O7, untwinned single crystal, ac susceptibility, dc magnetization.

Hideo Ishii, Shoichi Honjo, Yoshihiro Iwata, Takashi Yamada, and Hiroshi Hashimoto, "Numerical Approach for a Description of Electromagnetic Phenomenon in Superconducting Composites." To be published in the Proc. of the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Power Engineering R&D Center, Tokyo Electric Power Company, Yokohama 230, JAPAN. Key words: electromagnetic phenomena, finite- element method, critical-state model, power-law model, ac loss.

Masataka Iwakuma, Masafumi Okabe, Kazuhiro Kajikawa, Kazuo Funaki, Masayuki Konno, Shinichi Nose, Munetsugu Ueyama, Kazuhiko Hayashi, and Kenichi Sato, "ac Losses in Bi2223 Multifilamentary Wires Exposed to a Magnetic Field Perpendicular to the Wide Surface." Presented at the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-81, JAPAN. Key words: high-Tc superconductor, ac loss, perpendicular field, Bi2223.

Yukikazu Iwasa, "A 'Permanent' HTS Magnet System: Key Design & Operational Issues and Applications." Presented at the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139. Key words: high-temperature superconducting (HTS) "permanent" magnet, on-board HTS magnets for Maglev, mine countermeasures, space and interplanetary vehicles.

O. Jepsen, O. K. Andersen, I. Dasgupta, and S. Savrasov, "Buckling and d-Wave Pairing in HiTc Superconductors." Submitted to J. Phys. Chem. Solids. Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, GERMANY; e-mail jepsen@and.mpi- stuttgart.mpg.de; preprint also available at cond-mat@xxx.lanl.gov (#9710266).

S. T. Johnson, P. D. Hatton, A.J.S. Chowdhury, J. Gardner, G. Balakrishnan, D.McK. Paul, and J. Hodby, "A Study of the Effect of Annealing Upon the High-Tc Superconductor Bi2Sr2CaCu2O8+d." To be published in Physica C. Laboratoire de Physique des Solides, Universite Paris-Sud, Batiment 510, F-91405 Orsay Cedex, FRANCE; e-mail stuart@lps.u-psud.fr. Key words: x-ray diffraction, structure of Bi2Sr2CaCu2Od, modulated structures, oxygen vacancies, structural phase transformation.

Atsushi Kamitani, Shigetoshi Ohshima, Takafumi Yokono, and Makoto Natori, "Frequency Dependence of Magnetic Shielding Performance in HTS Plates." Presented at the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Department of Electrical and Information Engineering, Faculty of Engineering, Yamagata University, Johnan 4-3-16, Yonezawa, Yamagata 992, JAPAN. Key words: YBCO, magnetic shielding, low frequency, T-method, FEM.

Takeshi Kato, Kengo Ohkura, Munetsugu Ueyama, Kazuya Ohmatsu, Kazuhiko Hayashi, and Ken-ichi Sato, "Development of High-Tc Superconducting Magnet Using Ag-Sheathed Bi2223 Tapes." To be published in the Proc. of the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Sumitomo Electric Industries, Ltd., 1-1-3 Shimaya, Konohana-ku, Osaka, JAPAN. Key words: silver-sheathed wire, Bi2223, refrigerator cooled magnet, high magnetic field, fast ramp rate.

Kenji Kawano, Kazuo Fukuta, and Akio Oota, "Intragranular Critical Current Density from History Effect in Ag-Bi2223 Tape." Presented at the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Toyohashi University of Technology, Tempaku-cho, Toyohashi, Aichi 441, JAPAN. Key words: Ag-Bi2223 composite tape, intragranular critical current density, intergranular critical current density, history effect, critical-state model.

Masaru Kiuchi, Akihito Yamasaki, Teruo Matsushita, Jun Fujikami, Kazuya Ohmatsu, and Ken-ichi Sato, "Distribution of Critical Current Density in a Superconducting Bi-2223 Tape Wire." Presented at the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Department of Computer Science and Electronics, Kyushu Institute of Technology, 680-4 Kawazu, Iizuka 820, JAPAN. Key words: Bi-2223 tape wire, scaling of current-voltage curve, distribution of pinning strength, Weibull function.

M. Kojima, S. Haseyama, M. Satoh, T. Sekikawa, H. Fujimoto, and Y. Nakamura, "Magnetic Shielding Effect of High-Tc Superconducting Plate." Presented at the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Central Research Laboratory, DOWA Mining Co., Ltd., 227-1 Tobuki-cho, Hachioji-shi, Tokyo 192, JAPAN. Key words: YBaCuO, Bi2223, magnetic shielding effect, two-dimensional distribution of flux density.

A. E. Koshelev and V. M. Vinokur, "Pinning-Induced Transition to Disordered Vortex Phase in Layered Superconductors." Submitted to Phys. Rev. B. Contact Janice Coble, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439; telefax (708) 252-9595; e-mail janice_coble@qmgate.anl.gov.

Atsushi Kume, Shigeo Nagaya, Takenori Nakajima, Naohiro Futaki, Nobuyuki Sadakata, Yoshiaki Nakao, Takashi Saitoh, and Osamu Kohno, "Design of the High-Tc Superconducting Model Cable." Presented at the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Fujikura Ltd., 1-5-1 Kiba, Koto-ku, Tokyo 135, JAPAN. Key words: high-Tc superconducting model cable, Bi-2223 Ag-sheathed tapes, transposed segment, design of cooling, coolant pressure loss.

A. V. Kuznetsov, D. V. Eremenko, and V. N. Trofimov, "Onset of Flux Penetration into a Type-I Superconductor Disk." To be published in Phys. Rev. B. Department of Quantum Electronics, Moscow State Engineering Physics Institute, Kashirskoe shosse 31, 115409 Moscow, RUSSIA; telephone +7 095 323 93 86; telefax +7 095 324 21 11; e-mail kuzn@htsc.mephi.ru. 74.25.Ha; 74.55.+h.

F. Letouze, C. Martin, M. Hervieu, A. Maignan, M. Daturi, C. Michel, and B. Raveau, "A Cr-Substituted '1201' Superconductor: Tl0.8(CrO4)0.2Ba2CuO4.2-d." To be published in Physica C (in press). ISMRA CRISMAT, Laboratoire de Crystallographie et de Sciences Materiaux, CNRS UMR 6508, Boulevard du Marechal Juin, F-14050 Caen Cedex, FRANCE; telephone +33 31 45 2604; telefax +33 31 95 1600; e-mail martin@crismat.ismra.fr. Key words: thallium superconductor, synthesis, HREM, magnetic susceptibility.

K. Maki and E. Puchkaryov, "Impurity Scattering in Electron-Doped High- Tc Cuprates." Submitted to Europhys. Lett. Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089- 0484. 74.72.-h; 74.25.Bt; 74.25.Fy.

Atsushi Mase, Shunichi Ikeda, Masaaki Yoshikawa, Yousuke Yanagi, Yoshitaka Itoh, Tetsuo Oka, Hiroshi Ikuta, and Uichiro Mizutani, "Preparation of Large c-Axis Oriented Melt-Processed Sm-Ba-Cu-O and Their Superconducting Properties." Presented at the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Department of Crystalline Materials Science, Nagoya University, Nagoya 464-01, JAPAN. Key words: melt-processed Sm123, c-axis orientation, Nd123 seed crystal, growth speed, high critical current density.

Satoshi Matsuoka, Masaki Sumida, Takateru Umeda, and Yuh Shiohara, "Coarsening of High Temperature Stable Phase Particles in RE(Nd,Sm,Y)BaCuO Melt." Presented at the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Superconductivity Research Laboratory, International Superconductivity Technology Center (ISTEC), 10-13 Shinonome 1-chome, Koto-ku, Tokyo 135, JAPAN; telephone +81 3 3536-5703 through -5705; telefax +81 3 3536-5714 or -5717. Key words: Nd422, Sm211, Y211, coarsening, particle size.

Yasunori Mawatari, "Guided Motion of Vortices in Planar Pinning Centers and Anisotropy of Nonlinear Transport Property." Presented at the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Frontier Technology Division, Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki 305, JAPAN. Key words: planar pinning centers, guided motion of vortices, nonlinear transport properties.

Katerina Moloni, Mark Friesen, Shi Li, Victor Souw, P. Metcalf, and M. McElfresh, "Universality of Glass Scaling in a YBa2Cu3O7-d Thin Film." To be published in Phys. Rev. B. Contact Mark Friesen, Department of Physics, Purdue University, 1396 Physics Building, West Lafayette, IN 47907-1396; telephone (765) 494-3045; telefax (765) 494-0706; e-mail friesen@physics.purdue.edu; preprint also available at cond- mat@xxx.lanl.gov (#9711147). Key words: superconducting, critical phenomena. 74.25.Bt; 74.25.Dw; 74.72.-h.

A. S. Moskvin and A. S. Ovchinnikov, "The Singlet-Triplet Magnetism and Induced Spin Fluctuations in the High-Tc Copper Oxides." To be published in Physica C. Department of Theoretical Physics, Ural State University, Lenin Ave. 51, 620083 Ekaterinburg, RUSSIA; telefax +7 3432 615 978; e-mail alexandr.moskvin@usu.ru; preprint also available at cond-mat@xxx.lanl.gov (#9711116). Key words: copper oxides, singlet- triplet magnet, induced spin fluctuations. 74.20.Hi; 74.25.Ha.

S. Mukoyama, H. Ishii, S. Honjo, Y. Iwata, K. Miyoshi, H. Tsubouti, T. Yoshida, M. Mimura, and N. Uno, "ac Losses of High-Tc Superconductor for Power Cables." Presented at the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. The Furukawa Electric Co., Ltd., Chiba 290, JAPAN. Key words: ac losses, HTS power cable, BSCCO tape, current distribution, UCD model.

P. Mune, J. Lopez, and E. Altshuler, "Temperature Dependence of Some Intragranular Parameters in BSCCO Polycrystalline Superconductors Obtained Through the Magnetic Hysteresis of Jc." To be published in Physica C (in press). Superconductivity Laboratory, IMRE-Physics Faculty, University of Havana, 10400 Havana, CUBA; e-mail jea@infomed.sld.cu.

S. Nagaya, T. Hirasawa, Y. Nakao, T. Nakajima, and T. Saitoh, "Pressure Drop Measurement of Liquid-Nitrogen Flow in Conductor Conduit of Cables." Presented at the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Chubu Electric Power Co., Inc., Nagoya 459, JAPAN. Key words: liquid nitrogen, conductor conduit, pressure drop measurement.

Yoshinori Nakayama, Natsuko Takase, Miki Tagomori, Masaru Kiuchi, and Teruo Matsushita, "Effect of Distribution of Flux Pinning Strength on Irreversibility Line and Transition Line." Presented at the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Department of Computer Science and Electronics, Kyushu Institute of Technology, 680-4 Kawazu, Iizuka 820, JAPAN. Key words: irreversibility line, transition line, vortex glass-liquid transition, distribution of flux pinning strength, flux creep-flow model.

Baorong Ni, Jiwu Xiong, and Zhongxian Zhao, "Effect of MgO Particle Addition on Flux Pinning Characteristic in Partial-Melting Processed Bi- 2212 Bulk." Presented at the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Department of Electronic Materials Engineering, Fukuoka Institute of Technology, Fukuoka 811-02, JAPAN. Key words: partial-melting process, MgO particles, critical current density, flux pinning.

M. R. Norman, M. Randeria, H. Ding, and J. C. Campuzano, "Phenomenology of Photoemission Lineshapes of High Tc Superconductors." Materials Sciences Division-223, Argonne National Laboratory, Argonne, IL 60439; telephone (630) 252-3518; telefax (630) 252-7777; e-mail norman@thio.msd.anl.gov; preprint also available at cond- mat@xxx.lanl.gov (#9711232). 71.25.Hc; 74.25.Jb; 74.72.Hs; 79.60.Bm.

A. Oral, J. C. Barnard, S. J. Bending, I. I. Kaya, S. Ooi, H. Taoka, T. Tamegai, and M. Henini, "Vortex Lattice Melting in Bi2Sr2CaCu2O8+d Single Crystals: Insights from Scanning Hall Probe Microscopy." Presented at the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Department of Physics, Faculty of Science, University of Bath, Claverton Down, Bath, BA2 7AY, UNITED KINGDOM; telephone +44 225 826826; telefax +44 225 462508. Key words: flux vortex lattice, vortex lattice melting, scanning Hall probe microscopy, intermediate state.

Jason K. Perry and Jamil Tahir-Kheli, "Electronic Structure of La1.85Sr0.15CuO4: Characterization of a Fermi Level Band Crossing." Submitted to Phys. Rev. B. First Principles Research, Inc., 8391 Beverly Blvd., Suite #171, Los Angeles, CA 90048; Jamil Tahir-Kheli's telephone (213) 465-9572; telefax (213) 465-2805; e-mail jamil@firstprinciples.com; Web site http://www.firstprinciples.com; preprint also available at cond-mat@xxx.lanl.gov (#9711184).

D. M. Pooke, J. L. Tallon, R. G. Buckley, G. Todd, S. S. Kalsi, A. Szczepanowski, A. Sidi-Yekhlef, G. Snitchler, H. Picard, R. E. Schwall, B. MacKinnon, and R. Neale, "Cryo-Integrated HTS Ion-Beam Switching Magnet." Submitted to the Proc. of the 15th Int. Conf. on Magnet Technology (MT-15), Beijing, People's Republic of China, Oct. 20-24, 1997. Industrial Research Ltd. (IRL), P.O. Box 31313, Lower Hutt, NEW ZEALAND; e-mail d.pooke@irl.cri.nz; Web site http://www.irl.cri.nz.

Ch. Renner, B. Revaz, J.-Y. Genoud, K. Kadowaki, and O. Fischer, "Pseudogap Precursor of the Superconducting Gap in Under- and Overdoped Bi2Sr2CaCu2O8+d." To be published in Phys. Rev. Lett. Departement de Physique de la Matiere Condensee, Universite de Geneve, 24 Quai Ernest- Ansermet, CH-1211 Geneva 4, SWITZERLAND; telephone +41 22 702 6111; telefax +41 22 702 6869; e-mail christophe.renner@physics.unige.ch. 74.50.+r; 74.25.Jb; 74.25.Dw; 74.72.Hs.

B. Revaz, J.-Y. Genoud, A. Junod, A. Erb, and E. Walker, "Observation of d-Wave Scaling Relations in the Mixed-State Specific Heat of YBa2Cu3O7." Submitted to Phys. Rev. Lett. Departement de Physique de la Matiere Condensee, Universite de Geneve, 24 Quai Ernest-Ansermet, CH-1211 Geneva 4, SWITZERLAND; telephone +41 22 702 6230; telefax +41 22 702 6869; e- mail bernard.revaz@physics.unige.ch; preprint also available at cond- mat@xxx.lanl.gov (#9711103). 74.25.Bt; 74.25.Jb; 74.60.Ec; 74.72.Bk.

J. Roehler, S. Link, K. Conder, and E. Kaldis, "The Dimpling in the CuO2 Planes of YBa2Cu3Ox (x=6.806-6.984, T=20-300 K) Measured by Yttrium EXAFS." To be published in J. Phys. Chem. Solids. II. Physikalisches Institut, Universitaet zu Koeln, Zuelpicherstr. 77, D-50937 Koeln, GERMANY; e-mail abb12@rs1.rrz.uni-koeln.de; preprint also available at cond-mat@xxx.lanl.gov (#9711004).

K. Sato, K. Hayashi, K. Ohkura, and K. Ohmatsu, "HTS Wires and Application Progress." Submitted to the Proc. of the 15th Int. Conf. on Magnet Technology (MT-15), Beijing, People's Republic of China, Oct. 20- 24, 1997. Basic High-Technology Laboratories, Sumitomo Electric Industries, Ltd., Osaka 554, JAPAN; telephone +81 6 466 5633; telefax +81 6 466 5704; e-mail sato@okk.sei.co.jp.

M. Sawamura, H. Teshima, and M. Tsuchimoto, "Numerical Analysis on Levitation Force of Y-Ba-Cu-O Bulk Superconductor." Presented at the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Advanced Technology Research Laboratories, Nippon Steel Corporation, 3- 35-1 Ida Nakahara-ku, Kawasaki 211, JAPAN. Key words: high-Tc superconductor, levitation force.

Seok-Jong Seo, Naomichi Sakai, Tomotaka Segawa, Sang-Im Yoo, and Masato Murakami, "Superconducting Properties of Melt-Grown Binary Mixed (Sm1- xGdx)-Ba-Cu-O Superconductors." Presented at the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Superconductivity Research Laboratory, International Superconductivity Technology Center (ISTEC), 16-25 Shibaura 1-Chome, Minato-ku, Tokyo 185, JAPAN. Key words: (Sm1-xGdx)-Ba-Cu-O, superconductor, melt processing, low oxygen partial pressure, peritectic decomposition temperature.

Daniel E. Sheehy and Paul M. Goldbart, "Intrinsic Resistivity and the SO(5) Theory of High-Temperature Superconductors." Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801; Paul M. Goldbart's e-mail paul@paul.physics.uiuc.edu; preprint also available at cond- mat@xxx.lanl.gov (#9711193). 74.40.+k; 74.72.-h; 74.80.-g.

Toshikazu Shibata, Michihiko Watanabe, Chizuru Suzawa, Jun Fujikami, Shigeki Isojima, Ken-ichi Sato, Hideo Ishii, Syoichi Honjo, and Yoshihiro Iwata, "Initial Loading Test of 30 m Long High Tc Superconducting Power Cable Prototype." Submitted to the Proc. of the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Sumitomo Electric Industries, Ltd., Osaka 554, JAPAN. Key words: power transmission, superconducting cable, loading test, dielectric, liquid nitrogen.

Jun'ichi Shiraishi, Mahito Kohmoto, and Kazumi Maki, "Novel Vortex Lattice Transition in d-Wave Superconductors." Institute for Solid State Physics, University of Tokyo, Roppongi, Minato-ku, Tokyo 106, JAPAN.

Jun'ichi Shiraishi, Mahito Kohmoto, and Kazumi Maki, "Vortex Lattice Transition in d-Wave Superconductors." Institute for Solid State Physics, University of Tokyo, Roppongi, Minato-ku, Tokyo 106, JAPAN.

G. P. Srivastava, Vincent Mathew, and Agnikumar G. Vedeshwar, "Studies on High-Tc Superconducting Microstrip Resonator." To be published in Physica C (in press). Department of Electronic Science, University of Delhi South Campus, New Delhi 110021, INDIA; telefax +91 11 6886427. Key words: microstrip resonator, superconducting devices, spectral- domain method, impedance Green's functions. 85.25.-j; 84.40.Cb; 84.40.Yw.

M. Stebelski, M. Lisowski, and E. Zipper, "The Two-Fluid Description of a Mesoscopic Cylinder." To be published in Z. Phys. B. Department of Theoretical Physics, University of Silesia, Ul. Uniwersytecka 4, 40-007 Katowice, POLAND; e-mail mstebels@server.phys.us.edu.pl. Key words: mesoscopic cylinder, two-fluid model, Fermi surface, spontaneous, persistent currents. 71.30.+h; 72.10.-d.

Ryoko Sugano and Toshiyuki Onogi, "Field-Driven Coupling Transition in the Vortex State of Irradiated Bi2Sr2CaCu2O8: Computer Simulation Study." Advanced Research Laboratory, Hitachi, Ltd., Hatoyama, Saitama 350-03, JAPAN. 74.60.Ge; 74.40.+k; 74.80.Dm.

Miki Tagomori, Masaru Kiuchi, Teruo Matsushita, and Takayo Hasegawa, "Dependence of Irreversibility Field on the Thickness of Superconducting Layer." Presented at the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Department of Computer Science and Electronics, Kyushu Institute of Technology, 680-4 Kawazu, Iizuka 820, JAPAN. Key words: irreversibility field, multilayered Bi-2212 tape wire, flux creep flow model, longitudinal flux bundle size, thickness dependence.

Jamil Tahir-Kheli, "Inter-Band Pairing Theory of Superconductivity." Submitted to Phys. Rev. B. First Principles Research, Inc., Suite #171, 8391 Beverly Blvd., Los Angeles, CA 90048; telephone (213) 465-9572; telefax (213) 465-2805; e-mail jamil@firstprinciples.com; Web site http://www.firstprinciples.com; preprint also available at cond- mat@xxx.lanl.gov (#9711170).

Atsunori Terasaki, Yousuke Yanagi, Yoshitaka Itoh, Masaaki Yoshikawa, Tetsuo Oka, Hiroshi Ikuta, and Uichiro Mizutani, "Flux Motion During Pulsed-Field Magnetization in Melt-Processed YBCO." Presented at the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Department of Crystalline Materials Science, Nagoya University, Nagoya 464-01, JAPAN. Key words: pulsed-field magnetization, velocity of flux lines, melt-processed YBCO.

J. L. Vargas, Na Zhang, D. L. Kaiser, and S. E. Babcock, "Systematic Copper Concentration Variations Along Grain Boundaries in Bulk-Scale YBa2Cu3O7-d Bicrystals." To be published in Physica C (in press). Contact S. E. Babcock, Applied Superconductivity Center, University of Wisconsin-Madison, 1500 Engineering Drive, Madison, WI 53706; telephone (608) 263-5696; telefax (608) 263-1087; e-mail babcock@engr.wisc.edu. Key words: bicrystal, grain boundaries, YBa2Cu3O7-d, composition, STEM, facets. 81.90.+c.

Xiao-Jing Wu, T. Tatsuki, S. Adachi, and K. Tanabe, "Structural Study on High-Pressure Synthesized (Hg,Tl)2Ba4Cu2CO3O8 Compound." 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, JAPAN; telephone +81 3 3536 5709; telefax +81 3 3536 5717; e-mail xjwu@istec.or.jp. Key words: (Hg0.5,Tl0.5)2Ba2Cu2CO3O8 compound, TEM observation, HRTEM simulation, XRD pattern simulation, intergrowth structure.

Yousuke Yanagi, Yoshitaka Itoh, Masaaki Yoshikawa, Tetsuo Oka, Atsunori Terasaki, Hiroshi Ikuta, and Uichiro Mizutani, "Pulsed-Field Magnetization of Y-Ba-Cu-O Superconducting Bulk Magnet Cooled by Refrigerator." Submitted to the Proc. of the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. IMRA Material R&D Co., Ltd., 5-50 Hachiken-cho, Kariya, Aichi 448, JAPAN. Key words: trapped flux density, pulsed-field magnetization, melt-processed YBCO.

Xin Yao, Makoto Kambara, Takateru Umeda, and Yuh Shiohara, "NdBa2Cu3O7-d Stoichiometry Control (at P_[O2]=0.21 atm) and Enhancement of Superconductivity." To be published in Physica C. Superconductivity Research Laboratory, International Superconductivity Technology Center (ISTEC), 3-35-2 Iioka-Shinden, Morioka, Iwate 020, JAPAN; telephone +81 19 635 9015; telefax +81 19 635 9017; e-mail yao@istec.or.jp. Key words: superconductor, substitution, phase diagram.

S. I. Yoo, S. Takebayashi, N. Hayashi, K. Nagashima, N. Sakai, and M. Murakami, "Seeded Melt Growth of Large LRE-Ba-Cu-O Bulk Superconductors." Presented at the 10th Int. Symp. on Supercond. (ISS'97), Gifu, Japan, Oct. 27-30, 1997. Railway Technical Research Institute, 2-8-38 Hikari-cho, Kokubunji-shi, Tokyo 185, JAPAN. Key words: LRE-Ba-Cu-O superconductor, seed crystal, melt process.

Alexandre M. Zagoskin and Masaki Oshikawa, "Spontaneous Magnetic Flux and Quantum Noise in a Doubly Connected Mesoscopic SND Junction." Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, B.C., CANADA V6T 1Z1; telephone (604) 822-3853; telefax (604) 822-5324; e-mail zagoskin@black- hole.physics.ubc.ca; preprint also available at cond-mat@xxx.lanl.gov (#9710260).

A. Yu. Zavidonov and D. Brinkmann, "Dynamic Spin Susceptibility of CuO2 Planes in High-Temperature Superconductors." Submitted to Phys. Rev. B. Physics Institute, University of Zurich, Winterthurerstrasse 190, CH- 8057 Zurich, SWITZERLAND, D. Brinkmann's telephone +41 1 635-5721 or -5722; telefax +41 1 635-5704. 74.72.-h; 75.50.Ee; 75.40.Gb; 75.90.+w.

R. Zeng, T. P. Beales, H. K. Liu, and S. X. Dou, "Deformation and Homogeneity of Ag-Sheathed Bi-2223 Multifilamentary Tapes." To be published in Supercond. Sci. & Technol. Center for Superconducting and Electronic Materials, University of Wollongong, NSW 2522, AUSTRALIA; telephone +61 2 4221 5730; telefax +61 2 4221 5731; e-mail rong@uow.edu.au; Web site http://www.uow.edu.au. Key words: deformation, uniformity, Ag-sheathed Bi-based tapes.

R. Zeng, J. Wang, H. K. Liu, and S. X. Dou, "The Formation Mechanism and Development of Grain Texture in the Preparation of Ag-Sheathed Bi-2223 Superconducting Tapes." To be published in Supercond. Sci. & Technol. Center for Superconducting and Electronic Materials, University of Wollongong, NSW 2522, AUSTRALIA; telephone +61 2 4221 5730; telefax +61 2 4221 5731; e-mail rong@uow.edu.au; Web site http://www.uow.edu.au. Key words: cold working, texture, Bi-2223 superconducting tapes.

J. X. Zhu and C. S. Ting, "Tunneling Spectrum into a d-Wave Superconductor with Time-Reversal-Symmetry Broken Surface State." Preprint #97:142, 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.Mn.

J. X. Zhu, C. S. Ting, J. L. Shen, and Z. D. Wang, "Ginzburg-Landau Equations for Layered p-Wave Superconductors." Preprint #97:143; 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; 74.60.-w; 74.60.Ec.

Y. T. Zhu, E. J. Peterson, P. S. Baldonado, J. Y. Coulter, D. E. Peterson, and F. M. Mueller, "Synthesis and Characterization of the New Compound EuBa4Cu3O8.5+d." Submitted to J. Phys. Chem. Solids. Materials Science and Technology Division, Mail Stop G755, Los Alamos National Laboratory, Los Alamos, NM 87545; telephone (505) 667-4029; telefax (505) 667-2264; e-mail yzhu@lanl.gov. Key words: Eu143, Rietveld refinement, crystal structure, space group, cuprate.

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

*Feb. 19 - 24, 1998: First International Conference on New Theories, Discoveries, and Applications of Superconductors and Related Materials (New3SC-1), Baton Rouge, La. Call for papers. Purpose of conference is to attempt to determine if "a radical change is needed in the fundamental approach to superconductivity, or if the conventional approaches are likely to bear fruit soon." Conference will focus on new ideas and measurements, concepts, and models of the mechanism and origin of high-temperature superconductivity, and intends to highlight the contributions of young and lesser-known researchers as well as those of senior scientists. Discussion time will be provided throughout the conference. Subjects include superconductors, giant magnetoresistance, and ferroelectric materials. Abstract deadline, December 15, 1997. For further information, contact J. D. Fan, Chairman New3SC, P.O. Box 9767, Baton Rouge, LA 70813-9767; telephone (504) 771-3926; telefax (504) 771- 3926; e-mail new3sc@grant.phys.subr.edu; Web site http://www.phys.subr.edu/conference/new3sc.htm.

High-Tc Update is the high-Tc superconductivity information exchange newsletter. Please send 1) preprints, reprints, and other research reports; 2) descriptions of on-going work; 3) meeting announcements and summaries.

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

Please address all contributions and inquiries to:
Dr. Sreeparna Mitra, A219 Physics,
Ames Laboratory/Iowa State University,
Ames, Iowa 50011-3020.
Telephone: (515) 294-3877 Telefax: (515) 294-1134.
E-mail: MITRA@AMESLAB.GOV
or MITRA@IASTATE.EDU.

Project Director/Editor: Sreeparna Mitra
Science Editor: John R. Clem
High-Tc Update, Vol. 11, #24, Decemeber 15, 1997.