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

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

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

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

NOTA BENE:

Bi Cuprates

As reported by Y. B. Huang (Geneve) et al., low ac coupling losses in multifilamentary Bi-2223 tapes have been achieved by introducing highly resistive, very thin oxide barriers based on Ag/BaZrO3 around each filament. The transverse resistivity between neighboring filaments was thus enhanced by a factor of 8-11 with respect to that of pure Ag- sheathed tapes. The maximum of the ac coupling losses as a function of frequency was found to be shifted from 2.8 Hz for Ag-sheathed Bi-2223 tapes to 23 Hz for tapes with oxide barriers. While the critical current density Jc(77K,0T) of tapes with oxide barriers is currently only 1.0-1.3 x 10^4 A/cm^2, the authors are confident that this can be raised to the usual levels, around 3.0 x 10^4 A/cm^2, for tapes with a pure Ag sheath.

A recent paper by G. Grasso and R. Fluekiger (Geneve) [Supercond. Sci. Technol. 10, 223 (1997)] has reported the development of rectangular Ag- sheathed Bi-2223 wires with reduced anisotropy. While the critical current density Jc(77 K) vanishes at a magnetic field of 0.5 T along the tape normal in standard tapes, the Jc of the rectangular tapes vanishes only at fields exceeding 0.8 T, regardless of the orientation of the applied magnetic field. The rectangular tapes also may make possible new methods of cable transposition, thereby reducing ac losses.

The transport and magnetic ac losses in two Bi-2223/Ag tapes differing in number of filaments have been measured by F. Goemoery (Pirelli-Milano and Bratislava) et al. The authors found that when the tapes carry a transport ac current, strong electromagnetic coupling between filaments leads to nonuniform distribution of current among the individual filaments. The results of the magnetic measurements, on the other hand, were consistently explained by assuming negligible electromagnetic coupling between filaments.

A preprint by J. Shimoyama (Tokyo) et al. reports that heavily Pb-doped Bi-2212 single crystals have critical current density Jc and irreversibility field H_[irr] approximately one order of magnitude higher than in conventional Pb-free Bi-2212 crystals. Above 65 K, a moderately overdoped Pb-doped crystal even showed higher Jc and H_[irr] than a Pb-ion irradiated Bi-2212 single crystal with columnar defects. An anomalous dependence of Jc on both temperature and magnetic field suggests that the dramatically improved flux-pinning properties may be due to new temperature- and field-induced pinning centers.

The reversible mixed-state magnetization of three La-substituted ceramic samples of Bi1.95Sr2.05-xLaxCuOy (Bi-2201) has been measured by G. Triscone et al. (UC-San Diego). As in the Bi-2212 phase, the anisotropy of Bi-2201 is large. A manifestation of this anisotropy is the field- independent magnetization M* observed at a temperature T*.

RBa2Cu3O7-d

A preprint by M. A. Teplov et al. (Kazan State) reports pulsed Cu NQR spectra at frequencies 28-33 MHz in YBa2Cu3O7-d, TmBa2Cu3O7-d, and Y0.9Pr0.1Ba2Cu3O7-d at temperatures 4.2-200 K. Quantitative analysis shows that the Cu(2) (plane) spectral shape is well described with a model of 1D correlations of charge and spin distribution in CuO2 planes (stripe correlations). In the undoped superconductors the charge-spin stripe structure moves rapidly along the CuO2 planes, but doping the YBa2Cu3O7-d lattice with Pr slows this motion down.

The x-ray absorption fine structure (EXAFS) at the Y K edge of YBa2Cu3Ox (x = 6.806, 6.826, 6.886, 6.947, 6.968, and 6.984) has been studied by J. Roehler (Koeln) et al. at temperatures 20-300 K to determine the local structure at the underdoped-overdoped transition. The authors find that the O(2,3)-Cu(2) spacing along c is largest at optimum doping (x_[opt] = 6.92+-0.01) where Tc is maximized.

Measurements of the resistivity and the Seebeck effect in the mixed state of an underdoped (60 K) YBa2Cu3O7-d single crystal are reported by Y. Sato et al. (SRL-ISTEC). From the Seebeck measurements, the authors find evidence that there are two components (quasiparticles and vortices) carrying entropy in the mixed state. The authors also find evidence for the opening of a pseudogap above Tc.

The Raman spectra of YBa2Cu3O7-d and Bi2Sr2(Ca0.62Y0.38)Cu2O8+d in the underdoped range of the phase diagram have been studied by R. Nemetschek (Walter Meissner Institut) et al. as a function of temperature and polarization. In both compounds, carrier-related properties are predominantly seen at the B_[2g] symmetry. Below 200 K, a pseudogap opens up in the carrier channel for frequencies less than approximately 700 cm^[-1] and the spectral weight decreases by 10%. Below Tc, a superconducting gap opens up, which closely resembles that observed at higher doping levels. It is compatible with d_[x^2-y^2] pairing, and its magnitude 2Delta_0 is about 8 k_BTc.

Other Cuprates

Magnetoresistance measurements by A. Malinowski (Warsaw) et al. on highly underdoped superconducting La2-xSrxCuO4 films with x = 0.051 and x = 0.048, performed in dc magnetic fields up to 20 T at temperatures down to 40 mK, have revealed a magnetic-field-induced transition from weak to strong localization in the normal state. The normal-state conductances per CuO2 plane, measured at different fields in a single specimen, were found to collapse to one curve using a single scaling parameter that is inversely proportional to the localization length. The scaling parameter extrapolates to zero near zero field and possibly at a finite field, suggesting that in the zero-field limit the electronic states may be extended.

As reported by F. F. Balakirev (Rutgers) et al., measurements of resistivity, Hall effect, and magnetoresistance have been made on seven c-axis-oriented thin-film specimens of La2-xSrxCuO4 with values of x from 0.048 to 0.275 and on one specimen that also contained Nd. The orbital magnetoresistance was found not to be proportional to the square of the tangent of the Hall angle except for values of x near 0.15 above about 80 K. For smaller values of x, the temperature dependence of the magnetoresistance was found to be different, but quite similar in the various specimens, in spite of large differences in resistivity, Hall coefficient, and Hall angle.

Evidence for strong electron-phonon interactions in HgBa2Ca3Cu4O10+d (Hg-1234) has been found by X. Zhou (MPI-Stuttgart) et al. The authors measured micro-Raman spectra of a large Hg-1234 grain in parallel polarization at temperatures 295 K, 150 K, 120 K, 70 K, and 4.6 K. As the temperature decreased below Tc, the spectrum showed dramatic changes, including a strong increase in intensity of initially weak phonon features and an abrupt change in peak position and linewidth. These changes evidently signal the opening of the superconducting gap and the coupling of electrons and phonons.

A preprint by J. Hauck (IFF-KFA, Juelich) presents pseudobinary phase diagrams MOx for M = BaCu and HgBa2Cu on plots of temperature T vs. oxygen content x. The diagrams show the variation of x with temperature and oxygen partial pressure at constant composition of metal atoms M. The diagrams were obtained from thermodynamic data, thermogravimetry, and x-ray diffraction experiments.

Vortices

The observation of distinct thermal signatures of first-order vortex- lattice melting is reported by A. Schilling (LBNL and UC-Berkeley) et al. for external magnetic fields H both parallel and perpendicular to the c axis of an untwinned YBa2Cu3O7-d single crystal. Latent heats and discontinuities in specific heat were observed for both cases. The entropies of melting and the melting lines H_m(T) scale with an anisotropy parameter gamma ~~ 8. The specific heat of the vortex fluid is considerably larger than that of the vortex solid (by up to 2 mJ/mole K^2), which is not explained by simple arguments based on counting the numbers of thermodynamic degrees of freedom.

A preprint by S. S. Banerjee (TIFR) et al. presents a generic phase diagram in the magnetic field-temperature (H,T) plane including the effects of thermal and quenched disorder. The plot includes the normal metal, unpinned vortex liquid, pinned vortex liquid, plastically deformed vortex solid, elastically deformed vortex solid, and the Meissner state.

Periodic vortex lattices in a random pinning potential are discussed in a preprint by T. Giamarchi (Orsay) and P. Le Doussal (ENS-Paris). The authors have predicted that the phase diagram contains a topologically ordered Bragg-glass phase with quasi-long-range translational order at low magnetic fields, and another glassy phase with dislocations or a pinned liquid at high magnetic fields. The authors discuss the behavior when the vortex lattice is driven by an external force. A moving vortex array can exhibit an effective transverse critical pinning force due to barriers to transverse motion.

A Monte Carlo study of the d = 3 gauge-glass and the XY-spin-glass models has been carried out by C. Wengel and A. P. Young (UC-Santa Cruz) in the vortex representation. Without screening of vortex interactions, the authors find that both models show a glass transition at a finite temperature and, within the numerical accuracy, exhibit the same critical exponents: nu = 1.3+-0.3 and z ~~ 3.1. With strong screening, however, the finite-temperature glass transition is destroyed in both cases, and the same exponent nu = 1.05+-0.1 is found at the resulting zero-temperature transition.

The stability of vortex configurations in thin superconducting films and layered Josephson-coupled superconductors under an applied current has been investigated by I. Aranson (Bar Ilan and Argonne) and V. Vinokur (Argonne) both analytically and by numerical simulations using the time- dependent Ginzburg-Landau equation. With increasing current in a film, transitions occur from a pinned state to a plastic-flow state and then to an elastic-flow state. More complex behavior is found for layered current-carrying superconductors.

The vortex-lattice structure in a d_[x^2-y^2]-wave superconductor has been investigated near the upper critical magnetic field by M. Ichioka et al. (Okayama) using the Ginzburg-Landau theory with higher-order derivatives derived from the Gor'kov equation. With decreasing temperature, the authors find that the vortex lattice gradually changes from a regular triangular lattice to a square lattice through the shape of an isosceles triangle. The base of the isosceles triangle is along the a axis or the b axis of the crystal.

Magnetization measurements have been carried out by C. D. Dewhurst and R. A. Doyle (IRC-Cambridge) on several crystals of Bi2Sr2CaCu2O8+d (Bi- 2212) as a function of temperature and magnetic field. The authors identify a pinning crossover for vortices at fields above the arrowhead second-peak transition but below the irreversibility line. In addition, a small but clear feature is seen in the derivative of the magnetic moment as a function of temperature at fields below that of the arrowhead at an almost field-independent temperature of about 32 K. These features define a pinning-related transition that crosses continuously from the disordered into the ordered vortex-solid phase.

A study of the in-plane current-voltage characteristics of the layered organic superconductor kappa-(BEDT-TTF)2Cu(NCS)2 in magnetic fields perpendicular to the superconducting planes has been carried out by S. Friemel and C. Pasquier (Orsay). The authors obtain the vortex correlation volume, and they show that the correlation length parallel to the field decreases with increasing field because of growing intraplane vortex interactions.

Theory

A preprint by M. Greiter (Stanford) argues that there is no low-energy (41 meV) resonance associated with the pi operators introduced by E. Demler and S. C. Zhang [Phys. Rev. Lett. 77, 4126 (1995)]. The author concludes that the Hubbard model does not possess an approximate SO(5) symmetry generated by these operators, and he reinterprets recent finite-size studies accordingly.

A simple model for the metallic stripes found in La1.6-xNd0.4SrxCuO4, namely a two-chain Hubbard ladder embedded in a static antiferromagnetic environment, has been studied by Yu. A. Krotov (UC-Berkeley) et al. Two cases are considered: (a) the magnetic order on the two sides of the ladder forces a pi phase shift in the Neel order parameter (a topological stripe) and (b) the Neel order parameter stays in phase across the stripe (a nontopological stripe). The authors find that when the Hubbard ladder is lightly doped, superconductivity is enhanced (relative to the isolated Hubbard ladder) in the topological stripe but is totally suppressed in the nontopological stripe.

The Ginzburg-Landau equations for a d-wave superconductor with a repulsive s-wave interaction between electrons in the presence of paramagnetic impurities have been derived microscopically by W. K. Kim and C. S. Ting (TCSUH) using the Born approximation. The authors also find that the transition temperature for a superconductor with s-wave symmetry is suppressed twice as rapidly as that with d-wave symmetry in the dilute impurity limit if the strength of the spin-nonflip scattering is much weaker than the spin-flip interaction.

According to a preprint by A. V. Balatsky and S. A. Trugman (Los Alamos), any superconductor with magnetic impurities is gapless because of a Lifshitz tail in the density of states extending to zero energy. The authors show that fluctuations in the impurity distribution produce regions of suppressed superconductivity, which are responsible for the low-energy density of states.

The Josephson current in a clean s-wave superconductor/normal metal/d- wave superconductor (SND) junction is predicted by A. M. Zagoskin (UBC) to be periodic in the superconducting phase difference phi with period pi rather than 2pi. The author thus predicts that the frequency of the ac Josephson effect is twice that in conventional superconductors. The effect is due to current-carrying Andreev levels in the normal layer with phase differences phi and phi + pi.

SND junctions also have been studied by A. Huck (Hamburg) et al., who find that the supercurrent perpendicular to the junction has a leading term varying as sin-2phi, rather than sin-phi. In addition, the authors calculate the spontaneous Josephson current that flows parallel to the junction interface, and they discuss possible experiments to observe the predicted effects.

Quasiparticle bound states and low-temperature peaks of the conductance of normal/insulator/superconductor (NIS) junctions in d-wave superconductors have been studied by Yu. S. Barash (Lebedev Institute) et al. The authors conclude that a systematic experimental study of low-temperature peaks in the conductance of NIS junctions for a series of lattice-to-surface orientations would give valuable information on the anisotropy of the superconducting order parameter. The authors also stress that nonzero-bias peaks give information on the gap amplitude in the bulk, even though the order parameter is suppressed at the surface.

A preprint by I. Zutic and O. T. Valls (Minnesota) proposes a method to determine the nodal structure of the energy gap of unconventional superconductors such as the high-Tc materials. The authors show how nonlinear electrodynamics phenomena in the Meissner regime, arising from the presence of lines on the Fermi surface where the superconducting energy gap is very small or zero, can be used to locate the angular positions of these lines.

Theory for a superconducting phase originating from a pairing instability of the half-metallic antiferromagnetic (HF AFM) normal state is presented in a preprint by R. E. Rudd (SFA and NRL) and W. E. Pickett (NRL). This single-spin superconducting (SSS) phase contains broken time-reversal symmetry in addition to broken gauge symmetry, the former due to the underlying magnetic order in the normal state. The authors also construct the Ginzburg-Landau free energy for the superconducting order parameter.

A preprint by N. M. Krishna and K. N. Shrivastava (Hyderabad) investigates a model in which the electron-phonon interaction is responsible for superconductivity in the cuprates. The authors find that the transition temperature of the superconductor oscillates as a function of n, the number of CuO2 layers in the unit cell, with a maximum at n = 3. The authors predict that the next maximum value of Tc occurs at n = 7 but with a lower Tc than at n = 3.

Surface Impedance

A procedure for accurately determining the unloaded Q, the resonant frequency, and the coupling coefficients of a dielectric resonator in the transmission mode has been developed by K. Leong (James Cook) et al. The technique is based on a derived equation relating S_[21] and Q_L and measurements of S_[21], S_[11], and S_[22], and it accounts for crosstalk, coupling, and cable losses.

Measurements of the magnetic-field-modulated microwave absorption in two series of YBa2Cu3O7/PrBa2Cu3O7 multilayers, one with a PrBa2Cu3O7 thickness in the range ~2.5 to ~10 nm and a fixed YBa2Cu3O7 thickness of ~10 nm and the other with YBa2Cu3O7 and PrBa2Cu3O7 layers of the same thickness (~2.5 nm) but with different resistivities of the PrBa2Cu3O7 layer, are reported by J. Dumas (Grenoble) et al. The Fourier spectrum of the reflected microwave power reveals one fundamental frequency at Tc and even harmonics of the modulation-field frequency f at lower temperatures. The authors determine the irreversibility line near Tc from the vanishing of the nonlinear response at 2f in the presence of superimposed dc and modulation fields.

The vector partial differential equations for the linear electrodynamic response of a type-II superconductor in the mixed state are derived by M. W. Coffey (Colorado-Denver). The author illustrates the theory with a planar superconducting waveguide, for which the complex propagation constant, phase velocity, and surface impedance are obtained.

Measurements of the surface impedance of polycrystalline Pb0.82In0.18 and a pure Nb single crystal at 1 kHz to 3 MHz are reported by N. Luetke-Entrup et al. (ENS-Paris). The authors find that in these materials the linear ac response is entirely governed by surface pinning, while vortices in the bulk respond freely.

Thin Films

The observation of persistent photoconductivity in overdoped Tl2Ba2CuO6+d (Tl-2201) is reported by A. Hoffmann (UC-San Diego) et al. Contrary to the behavior in underdoped RBa2Cu3O7-d (R = rare earth or Y), illumination of Tl-2201 can produce either a persistent increase or decrease of the carrier density, depending on doping and wavelength of the incident light. It is thus possible to reversibly increase or decrease the superconducting transition temperature in Tl-2201. These photoinduced changes can be explained in terms of localized states in the charge-reservoir layer.

Bicrystal grain-boundary Josephson junctions have been fabricated by H. Q. Li (NIST-Boulder) et al. in a stack of two layers of YBa2Cu3O7-d separated by epitaxial SrTiO3. Weak-link behavior was observed in bridges formed in both layers, with similar shunted-junction characteristics but with significantly different critical currents. Characteristic voltages up to 1.9 mV were measured at 4.5 K. Resonant structure was seen in the current-voltage characteristics of the upper- layer junctions, and interactions between the junctions in the two layers were evident.

As reported by F. Tafuri (Napoli) et al., the properties of YBa2Cu3O7-d biepitaxial Josephson junctions have been reproducibly modified by focused electron-beam irradiation in the interface region. The junctions were fabricated by depositing YBa2Cu3O7-d thin film by cylindrical magnetron sputtering on the (110) SrTiO3 substrate, partially covered by a pre-grown MgO seed layer. Electron irradiation decreased the critical current of the junctions and increased the normal-state specific resistivities up to values of the order of 1 micro-ohm-cm^2.

A preprint by W. E. Booij et al. (IRC-Cambridge) reports on the use of focused electron-beam irradiation (FEBI) to fabricate proximity-coupled junctions in an unbroken single layer of material such as YBCO. The authors found that the conventional model for SNS junctions as derived by de Gennes can explain the behavior of such junctions in great detail. The damage distribution produced by the electron beam has a FWHM of the order of 15 nm and is largely determined by the profile of the electron beam used in the fabrication process.

The observation by low-temperature (4.2 K) scanning tunneling microscopy and spectroscopy of a pronounced zero-bias conductance peak (ZBCP) in the conductance spectra of (110)-oriented YBa2Cu3O7-d epitaxial thin- film surfaces is reported by L. Alff (Electrotechnical Laboratory) et al. On films with low surface roughness, both the superconducting gap structure and the ZBCP appeared clearly in the spectra and depended upon neither the measurement position nor the distance between the tunneling tip and the sample surface. The results are in agreement with recent theoretical predictions of the formation of bound states on surfaces of d-wave superconductors that lead to a ZBCP with a maximum for (110)- oriented surfaces.

Measurements of the ac losses in YBa2Cu3O7-d films grown on rolling- assisted biaxially textured Ni substrates (RABiTS) are reported by H. R. Kerchner et al. (Oak Ridge). In the low-field and low-current regime, ac transport measurements yield a hysteretic loss per cycle per unit length given roughly by mu_0I_o^3/6piI_c, the result expected for a superconductor of elliptical cross section (I_0 is the maximum current in each cycle and I_c is the critical current).

Applications

The performance at 77 K of a high-temperature superconducting (HTS) coil fabricated from multifilamentary (Bi,Pb)2Sr2Ca2Cu3O10+d Ag-clad tape is reported by J. X. Jin (Wollongong) et al. The results show that the magnetic field at the HTS coil side edge, where the field is mostly perpendicular to the tape, limits the performance.

Other Activities

Two preprints by E. H. Brandt (MPI-Stuttgart) and one by Th. Schuster (MPI-Stuttgart) et al. report on the magnetic field and current profiles in the critical state of type-II superconducting samples of various shapes when subjected to time-varying magnetic fields.

The reduction of the static magnetic moment M of a superconducting plate by an alternating magnetic field applied perpendicular to a dc magnetic field has been studied experimentally and theoretically by L. M. Fisher (Moscow) et al. A complete disappearance of hysteresis of the magnetization curve in YBa2Cu3O7-d melt-textured samples was observed.

A preprint by T. Strohm and M. Cardona (MPI-Stuttgart) presents a method to determine the s-wave to d-wave gap ratio and positions of the nodes of the gap function in non-tetragonal high-Tc superconductors. The method involves the use of electronic Raman scattering results and LDA- LMTO band-structure calculations.

The use of neutron crystal-field spectroscopy to investigate underdoped and overdoped copper-oxide superconductors is described by A. Furrer et al. (ETH-Zurich and PSI). The results provide evidence for the formation of clusters and reveal information about the density of states of charge carriers at the Fermi energy. For underdoped systems there is evidence for the formation of a pseudogap below temperatures T* > Tc.

The structural and electrical properties of ferroelectric-superconductor composites with variable volume fractions have been studied by J. Marfaing et al. (Aix-Marseille). The authors found a high compatibility between Pb2(ScTa)O6 (PST) and YBa2Cu3O7-d (YBCO), with a zero-resistance critical temperature at 87 K for a PST/YBCO composite with 56% PST by volume.

A preprint by Z. W. Lu and B. M. Klein (UC-Davis) reports that the unusual properties of the A15 materials (e.g., V3Si, V3Ge, and N3Sn), including the lattice instabilities in some of these materials and the known elastic and phonon anomalies, are describable in terms of first- principles LDA electronic structure calculations.

Overview

The performance of several designs of dielectric resonators used for microwave characterization of HTS films has been analyzed by J. Mazierska (James Cook) from the point of view of accuracy, sensitivity, and range. The author suggests that the dielectric resonator technique can be considered as a standard for measurements of the surface resistance of HTS films for wireless and PCS applications provided that adequate measurements of the unloaded Q are obtained (50 refs.).

Ph.D. Theses

Neutron irradiation and dc transport in YBa2Cu3O7-d (YBCO) single crystals were the subject of the Oregon State Ph.D. thesis of Brandon R. Brown. While the dc current-voltage characteristics could be collapsed with critical scaling, this procedure did not yield universal exponents. The author thus concludes that the dc transport data do not provide satisfactory evidence of a glass-liquid phase transition. Overall, the data are most adequately described by dislocation-mediated thermal depinning, or percolation (156 refs.).

The Ph.D. thesis of L. S. Lingam (Hyderabad) discusses three topics: (a) the Mossbauer effect in superconductors, (b) the normal-state resistivity, and (c) the dendritic phase boundary of superconductors. Taking into account both fractal and spectral dimensionalities, the author predicts that the dendritic phase boundary will occur along a line determined by B^[8/5] proportional to (1 - T_[FM]/Tc), where T_[FM] is the flux-lattice melting temperature (89 refs.).

Contributed by John R. Clem

Contents: Technology News begin on page 6; Preprints begin on page 7; Coming Events begin on page 14; Resources are on page 15; and FYI is 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.

The Midwest Superconductivity Consortium (MISCON) consists of six member universities that focus group efforts to advance the science and understanding of HTS materials, development of new materials, and improved processing technology. The following are the six projects supported in 1996-97 by MISCON augmentation grants and are based on joint proposals for cooperative R&D between a MISCON investigator and an industrial partner.

Project 1: Fabrication of QD-PPMS Compatible Scanning Microscope; investigators are Purdue University and Quantum Design. Objective is to design and build a new low-temperature high-magnetic-field scanning- probe microscope that can be incorporated into the Quantum Design Physical Properties Measuring System (PPMS).

Project 2: Development of Sputtering Targets of Y1-xPrxBa2Cu3O7, YBa2(Cu1-xMx)3O7, and Related Materials; investigators are Ohio State University and Superconductive Components, Inc. Objective is to study the effects of specific dopants on high-temperature superconductors, primarily in thin film materials, by developing appropriate targets for pulsed-laser deposition and sputtering.

Project 3: Growth of Large NdBa2Cu3Ox Domains for Bearing Applications; investigators are University of Notre Dame (UND) and Superconductive Components, Inc. (SCI). Objective is to produce high-quality BaCuO2 powders at SCI and enable the processing at UND of large domains of 123 samples free from porosity and liquid-phase impurities for magnetic bearing applications.

Project 4: Fabrication of Long Length YBa2Cu3Ox/Noble Metal Composite Wires; investigators are University of Notre Dame and Plastronics, Inc. Objective is to produce and evaluate YBa2Cu3Ox/Ag-Pd microlaminates for conductor applications.

Project 5: The Oxidation Kinetics of Melt-Textured YBa2Cu3Ox During Heat Treatment at High Oxygen Fugacities; investigators are Ohio State University and Superconductive Components, Inc. Objective is to explore the effects of high-oxygen-fugacity heat treatments on the rate of YBa2Cu3Ox oxygenation and on the oxygen solubility in YBa2Cu3Ox.

Project 6: Effects of ac Magnetic Fields on Superconducting ac Currents; investigators are Purdue University and American Superconductor Corp. Objective is to understand how supercurrents are distributed in thin superconducting wires under alternating current conditions and the effects that adjacent superconducting wires may have on one another.

For information about MISCON and its projects, contact Arden L. Bement, Jr., Director, 1125 Physics Bldg, Rm 285, Purdue University, West Lafayette, IN 47907-1125; telephone (765) 494-5567; telefax (765) 496- 1178; e-mail miscon@materials.ecn.purdue.edu.

Thin films of high-Tc superconductors such as YBa2Cu3O7-d (YBCO) have been examined on an Oxford Instruments helium-cooled stage fitted to a SEM-based mapping system at the University of Birmingham. The technique proves to be a valuable diagnostic method of studying the spatial distribution of current carrying capacity in thin-film device structures. Configurations studied include simple microbridges, multilayer devices such as flux transformers, and Josephson junctions. Future work will take advantage of the recent addition of a beam blanking unit to the SEM which allows greater control of the electron beam, thus reducing the noise on the voltage contrast signal. Comparable imaging will be attempted on other samples such as thick films, wires, and tapes. For information contact Stephen Foulds, School of Metallurgy and Materials, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom; e-mail s.a.foulds@bham.ac.uk.

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.

L. Alff, H. Takashima, S. Kashiwaya, N. Terada, H. Ihara, Y. Tanaka, M. Koyanagi, and K. Kajimura, "Spatially Continuous Zero Bias Conductance Peak on (110) YBa2Cu3O7-d Surfaces." To be published in Phys. Rev. B. Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki 305, Niigata University, Ikarashi Niigata 950-21, JAPAN; e-mail lalff@colorix.ph2.uni-koeln.de. 74.50.+r; 74.72.-h; 74.80.Fp.

I. Aranson and V. Vinokur, "Surface Instabilities and Vortex Transport in Current-Carrying 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. 74.60.Ge; 68.10.-m; 05.60.+w.

V.P.S. Awana, Rajvir Singh, D. A. Landinez Tellez, J. M. Ferreira, J. Albino Aguiar, S. Uma, E. Gmelin, and A. V. Narlikar, "Superconductivity and Ordering of Pr in CaLa1-xPrxBaCu3O7 System." To be published in Mod. Phys. Lett. B. Centre for Superconducting & Electronic Materials, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, AUSTRALIA; telefax +61 42 21 3112; e-mail awana@uow.edu.au.

F. F. Balakirev, I. E. Trofimov, S. Guha, Marta Z. Cieplak, and P. Lindenfeld, "Orbital Magnetoresistance in the La2-xSrxCuO4 System." Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08855; e-mail fedor@physics.rutgers.edu; preprint also available at cond-mat@xxx.lanl.gov (#9705107). 72.15.Gd; 74.72.Dn; 71.27.+a; 71.30.+h.

A. V. Balatsky and S. A. Trugman, "On the Lifshitz Tail in the Density of States of a Superconductor with Magnetic Impurities." Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545; telephone (505) 665-0077; telefax (505) 665-4063; e-mail avb@viking.lanl.gov; preprint also available at cond-mat@xxx.lanl.gov (#9705093). 74.62.Dh; 71.55.-i.

Satyajit S. Banerjee, Subir Saha, Nitin G. Patil, S. Ramakrishnan, Arun K. Grover, Shobo Bhattacharya, G. Ravikumar, Prashanta K. Mishra, T. V. Chandrasekhar Rao, Vinod C. Sahni, Chakalakal V. Tomy, Geetha Balakrishnan, Don Mck. Paul, and Mark J. Higgins, "Disorder, History Dependence and Phase Transitions in a Magnetic Flux Line Lattice." Preprint #TIFR/CM/97/104(I); submitted to Nature. Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, INDIA; telephone +91 22 215-2971 or -2979; telefax +91 22 215-2110 or -2181; e-mail satya@tifrc2.tifr.res.in. Key words: type-II superconductors, phase diagram, effect of disorder, history dependence. 64.70.Dv; 74.60.Ge; 74.25.Dw; 74.60.Ec; 74.60.Jg.

Yu. S. Barash, A. A. Svidzinsky, and H. Burkhardt, "Quasiparticle Bound States and Low-Temperature Peaks of the Conductance of NIS Junctions in d-Wave Superconductors." To be published in Phys. Rev. B. P. N. Lebedev Physics Institute, Leninsky Prospect 53, Moscow 117924, RUSSIA; e-mail btp505@btp4xc.phy.uni-bayreuth.de; preprint also available at cond-mat@xxx.lanl.gov (#9705018). 74.50.+r; 74.80.Fp; 74.72.-h.

W. E. Booij, A. J. Pauza, E. J. Tarte, D. F. Moore, and M. G. Blamire, "Proximity Coupling in High-Tc Josephson Junctions Produced by Focused Electron Beam Irradiation." To be published in Phys. Rev. B. Department of Materials Science, University of Cambridge, Pembroke Street, Cambridge CB2 3QZ, UNITED KINGDOM; telephone +44 1223 334375; telefax +44 1223 334373; e-mail web1000@cam.ac.uk; Web site http://www.msm.cam.ac.uk/dmg.

Ernst Helmut Brandt, "Superconductors of Various Shape in Transverse and Longitudinal Magnetic Field." Submitted to the Proc. of the Int. Workshop on Critical Currents in Supercond. for Practical Appl. (SPA '97), Xi'an, People's Republic of China, March 6-8, 1997. Max-Planck- Institut fuer Metallforschung, Postfach 800665, D-70506 Stuttgart, GERMANY.

Ernst Helmut Brandt, "Thick Superconductors in a Perpendicular Magnetic Field." To be published in Physica C: Proc. of the 5th Int. Conf. on Mater. and Mech. of Supercond. -- High-Temp. Supercond. (M^2S-HTSC V), Beijing, People's Republic of China, Feb. 28-Mar. 4, 1997. Max-Planck- Institut fuer Metallforschung, Postfach 800665, D-70506 Stuttgart, GERMANY.

P. R. Broussard, M. A. Wall, and J. Talvacchio, "Structural Characterization of YBa2Cu3O7-d/Y2O3 Composite Films." Submitted to J. Mater. Res. Naval Research Laboratory, Washington DC 20375-5343; telephone (202) 767-6096; telefax (202) 767-1697; e-mail phillip.broussard@nrl.navy.mil; preprint also available at cond- mat@xxx.lanl.gov (#9705022). 61.16.Bg; 61.10.-i; 74.76.Bz; 68.55.-a.

Brandon R. Brown, "Neutron Irradiation and dc Transport in YBaCuO Single Crystals: A Study of Vortex Depinning." Submitted as a Ph.D. thesis (Oregon State University). Department of Physics, Oregon State University, Corvallis, OR 97331; e-mail brownb@physics.orst.edu.

Mark W. Coffey, "Electrodynamic Field Equations for Composite Superconducting Structures in the Mixed State." To be published in J. Low Temp. Phys. Department of Chemistry, University of Colorado, Denver, CO 80217.

S. Deser, L. Griguolo, and D. Seminara, "Gauge Invariance, Finite Temperature and Parity Anomaly in D = 3." Department of Physics, Brandeis University, Waltham, MA 02254; D. Seminara's e-mail seminara@binah.cc.brandeis.edu; preprint also available at hep- th@xxx.lanl.gov (#9705052). 11.10.Wx; 11.15.-q; 11.30.Er; 11.30.Rd.

C. D. Dewhurst and R. A. Doyle, "Evidence for a Depinning Transition in the Vortex Quasi-Lattice of Bi2Sr2CaCu2O8+d." Submitted to Phys. Rev. B. Interdisciplinary Research Centre in Superconductivity, University of Cambridge, West Cambridge Site, Madingley Road, Cambridge CB3 0HE, UNITED KINGDOM; telephone +44 1223 337 441; telefax +44 1223 337 074; e- mail cdd1001@cus.cam.ac.uk. 74.60.Ec; 74.60.Ge; 74.72.Hs.

P. Diko, V. R. Todt, D. J. Miller, and K. C. Goretta, "Subgrain Formation, 211 Particle Segregation and High-Angle 90 degree Boundaries in Melt-Grown YBaCuO." To be published in Physica C (in press). Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04353 Kosice, SLOVAKIA; telephone +42 95 633 8115; telefax +42 95 633 6292; e-mail dikos@rs530h.iepsaske.sk. Key words: melt-processed YBaCuO, microstructure, grains and subgrains, Y2BaCuO5 particle segregation. 74.25.-q; 74.72.Bk; 61.72.-y.

N. R. Dilley and M. B. Maple, "Effect of Stoichiometry and Alloying on the Peak Effect in CeRu2." To be published in Physica C (in press). Department of Physics and Institute for Pure and Applied Physical Sciences, University of California at San Diego, La Jolla, CA 92093; telephone (619) 534-3968; telefax (619) 534-1241.

J. Dumas, L. Besombes, N. Mokros, C. Schlenker, N. Didier, F. Weiss, and J. P. Senateur, "Field Modulated Microwave Absorption and Irreversibility Line in YBa2Cu3O7/PrBa2Cu3O7 Multilayers." To be published in Solid State Commun. Laboratoire d'Etudes des Proprietes Electroniques des Solides, CNRS, 25 Avenue Des Martyrs, BP 166, F-38042 Grenoble Cedex 9, FRANCE; telephone +33 4 76 88 1185; telefax +33 4 76 88 7988; e-mail dumas@lepes.polycnrs-gre.fr. Key words: high-Tc superconductors, flux pinning and creep.

V. D. Dzhunushaliev, "On the Quantization of Strongly Interacting Phonons." Theoretical Physics Department, Kyrgyz State National University, 720024 Bishkek, KYRGYZSTAN; e-mail dzhun@freenet.bishkek.su; preprint also available at cond-mat@xxx.lanl.gov (#9704062).

L. M. Fisher, A. V. Kalinov, S. E. Savel'ev, I. F. Voloshin, V. A. Yampol'skii, M.A.R. LeBlanc, and S. Hirscher, "Collapse of the Magnetic Moment in a Hard Superconductor Under the Action of a Transverse ac Magnetic Field." To be published in Physica C (in press). All-Russian Electrical Engineering Institute, Moscow, RUSSIA. Key words: critical state, flux cutting, two-liquid hydrodynamics.

S. Friemel and C. Pasquier, "Flux Pinning in the Vortex Liquid State of kappa-(BEDT-TTF)2Cu(NCS)2." To be published in Physica C. Laboratoire de Physique des Solides, URA 2, CNRS, Universite Paris-Sud, Batiment 510, F-91405 Orsay Cedex, FRANCE; telephone +33 1 69 15 53 58; telefax +33 1 69 15 60 86; e-mail friemel@lps.u-psud.fr. Key words: organic superconductor, mixed state, critical current density, flux pinning. 74.70.Kn; 74.25.Fy; 74.60.Ge; 74.60.Jg.

Albert Furrer, Joel Mesot, Wolfgang Henggeler, and Grit Boettger, "Neutron Crystal-Field Spectroscopy in Underdoped and Overdoped Copper- Oxide Superconductors." To be published in J. Supercond.: Proc. of the Int. Conf. on Stripes, Lattice Instabilities, and High Tc Supercond., Rome, Italy, Dec. 8-12, 1996. Laboratory for Neutron Scattering, Eidgenoessische Technische Hochschule Zurich & Paul Scherrer Institute, CH-5232 Villigen PSI, SWITZERLAND; telephone +41 56 310 2088; telefax +41 56 310 2939; e-mail albert.furrer@psi.ch. Key words: neutron spectroscopy, cuprates, crystal field, inhomogeneous materials properties, energy gap, pseudogap.

T. Giamarchi and P. Le Doussal, "Bragg- and Moving-Glasses: A Theory of Disordered Vortex Lattices." To be published in Physica C: the Proc. of the 5th Int. Conf. on Mater. and Mech. of Supercond. -- High-Temp. Supercond. (M^2S-HTSC V), Beijing, People's Republic of China, Feb. 28- Mar. 4, 1997. Laboratoire de Physique des Solides, Universite Paris- Sud, Bat. 510, F-91405 Orsay, FRANCE; e-mail giam@lps.u-psud.fr; preprint also available at cond-mat@xxx.lanl.gov (#9703099).

F. Goemoery and L. Gherardi, "Transport ac Losses in Round Superconducting Wire Consisting of Two Concentric Shells with Different Critical Current Density." To be published in Physica C. Pirelli Cavi SpA, c.2714, Viale Sarca 222, I-20126 Milano, ITALY; telephone +39 2 6442 2946; telefax +39 2 6442 5502. Key words: transport ac losses, critical state model, inhomogeneous Jc, high-Tc tapes.

F. Goemoery, L. Gherardi, R. Mele, D. Morin, and G. Crotti, "Critical State and ac Losses in Multifilamentary BiSrCaCuO-2223/Ag Tapes Studied by Transport and Magnetic Measurements." To be published in Physica C. Pirelli Cavi SpA, c.2714, Viale Sarca 222, I-20126 Milano, ITALY; telephone +39 2 6442 2946; telefax +39 2 6442 5502. Key words: ac losses, multifilamentary high-Tc tapes, ac susceptibility.

G. Grasso and R. Fluekiger, "Development of Rectangular Bi(2223) Wires with Reduced Anisotropy." To be published in Supercond. Sci. Technol. Contact R. Fluekiger, Departement de Physique de la Matiere Condensee, Universite de Geneve, 24 quai Ernest-Ansermet, CH-1211 Geneve 4, SWITZERLAND; telephone +41 22 702 6240; telefax +41 22 702 6869; e-mail rene.flukiger@physics.unige.ch.

Martin Greiter, "Is the pi-Particle Responsible for the 41 meV Peak in YBa2Cu3O7?" Preprint #SU-ITP 97/15. Department of Physics, Stanford University, Stanford, CA 94305; telefax (415) 723-9389; e-mail greiter@quantum.stanford.edu; preprint also available at cond- mat@xxx.lanl.gov (#9705049). 74.72.Bk; 74.25.Ha; 75.40.Gb.

J. Hauck, "Pseudobinary Phase Diagram of BaCuOx and HgBa2CuOx." Presented at the Int. Workshop of Crystal Chemistry of High-Tc Supercond. (CC-HTSC'97), Hefei, People's Republic of China, March 6-8, 1997. Institut fuer Festkoerperforschung, KFA Research Center, D-52425 Juelich, GERMANY.

J. Hauck, S. Chernyaev, J. L. MacManus-Driscoll, and K. Mika, "Pseudobinary Phase Diagrams of Bi Cuprates." Presented at the 5th Int. Conf. on Mater. and Mech. of Supercond. -- High-Temp. Supercond. (M^2S- HTSC V), Beijing, People's Republic of China, Feb. 28-Mar. 4, 1997. Institut fuer Festkoerperforschung, KFA Research Center, D-52425 Juelich, GERMANY.

J. Hauck and K. Mika, "Architecture of Layered Cuprates." Presented at the Int. Workshop of Crystal Chemistry of High-Tc Supercond. (CC- HTSC'97), Hefei, People's Republic of China, March 6-8, 1997. Institut fuer Festkoerperforschung, KFA Research Center, D-52425 Juelich, GERMANY.

J. Hauck and K. Mika, "Classification of Superconducting Oxide Structures." Presented at the 5th Int. Conf. on Mater. and Mech. of Supercond. -- High-Temp. Supercond. (M^2S-HTSC V), Beijing, People's Republic of China, Feb. 28-Mar. 4, 1997. Institut fuer Festkoerperforschung, KFA Research Centre, D-52425 Juelich, GERMANY.

A. Hoffmann, Ivan K. Schuller, Z. F. Ren, J. Y. Lao, and J. H. Wang, "Persistent Photoconductivity in Overdoped High Tc Thin Films." Submitted to Phys. Rev. Lett. Department of Physics 0350, University of California, 9500 Gilman Drive, La Jolla, CA 92093-0350; e-mail hoffmann@ucsd.edu. 73.50.Pz; 74.25.Fy; 74.62.Yb; 74.72.Fq; 74.76.Bz.

Y. B. Huang, G. Grasso, F. Marti, A. Erb, S. Clerc, K. Kwasnitza, and R. Fluekiger, "Fabrication and Microstructure of Bi(2223) Multifilamentary Tapes with Low ac Losses." Presented at the Int. Workshop on Critical Currents in Supercond. for Practical Appl. (SPA '97), Xi'an, People's Republic of China, March 6-8, 1997. Contact R. Fluekiger, Departement de Physique de la Matiere Condensee, Universite de Geneve, 24 quai Ernest-Ansermet, CH-1211 Geneve 4, SWITZERLAND; telephone +41 22 702 6240; telefax +41 22 702 6869; e-mail rene.flukiger@physics.unige.ch.

Andrea Huck, Anne van Otterlo, and Manfred Sigrist, "Time Reversal Symmetry Breaking and Spontaneous Currents in s-Wave/Normal Metal/d-Wave Superconductor Sandwiches." I. Physikalisches Institut, Universitaet Hamburg, D-20355 Hamburg, GERMANY; Anne van Otterlo's e-mail at University of California at Davis, Calif. avo@onsager.ucdavis.edu; preprint also available at cond-mat@xxx.lanl.gov (#9705025).

Pham V. Huong, "Anisotropy in Superconductors and a Method to Determine the Orientation of Crystals and Thin Films." Submitted to the Third Joint ISTEC/MRS Int. Workshop on Supercond.: Suitable Materials and Processing for HTS Applications Towards the Next Decade, The Royal Waikoloan, Big Island, Hawaii, June 15-18, 1997. University of Bordeaux 1, 351 Cours Liberation, F-33405 Talence, FRANCE; telefax +33 556 848402; e-mail huong@morgane.lsmc.u-bordeaux.fr.

Masanori Ichioka, Naoki Enomoto, and Kazushige Machida, "Vortex Lattice Structure in a d_[x^2-y^2]-Wave Superconductor." Submitted to Phys. Rev. B. Department of Physics, Okayama University, Okayama 700, JAPAN; telephone +81 862 52 1111; telefax +81 862 52 7595; e-mail oka@mp.okayama-u.ac.jp; preprint also available at cond-mat@xxx.lanl.gov (#9704147). 74.72.-h; 74.60.-w; 74.60.Ec; 74.20.De.

J. X. Jin, C. Grantham, Y. C. Guo, J. N. Li, R. Bhasale, H. K. Liu, and S. X. Dou, "Magnetic Field Properties of Bi-2223/Ag HTS Coil at 77 K." To be published in Physica C (in press). Contact C. Grantham, Department of Electric Power, University of NSW, Sydney 2052, AUSTRALIA; telephone +61 29 385 4894; telefax +61 29 385 5993; e-mail c.grantham@unsw.edu.au. Key words: (Bi,Pb)2Sr2Ca2Cu3O10+x Ag clad HTS wire, HTS coil, magnetic field, critical ampere-turns, magnetic-field distribution. 74.70.-b; 74.60.Jg.

H. R. Kerchner, D. P. Norton, A. Goyal, J. D. Budai, D. K. Christen, D. M. Kroeger, Q. He, M. Paranthaman, D. F. Lee, B. C. Sales, F. A. List, and R. Feenstra, "Alternating Current Losses in Biaxially Textured YBa2Cu3O7-d Films Deposited on Ni Tapes." Submitted to Appl. Phys. Lett. Solid State Division, Oak Ridge National Laboratory, Building 3115, MS-6061, P.O. Box 2008-6061, Oak Ridge, TN 37831; telephone (423) 574-6270; telefax (423) 574-6263; e-mail hrk@ornl.gov.

W. K. Kim and C. S. Ting, "Ginzburg-Landau Equations for a d-Wave Superconductor with Paramagnetic Impurities." Preprint #97:041; submitted to Phys. Rev. B. Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, TX 77204-4792; telephone (713) 743-8200; telefax (713) 743-8201; e-mail preprints@www.tcs.uh.edu. 74.20.De; 74.20.Hi; 74.25.Ha; 74.60.-w.

Jens Kisker and Heiko Rieger, "The Two-Dimensional Disordered Boson Hubbard Model: Evidence for a Direct Mott Insulator-to-Superfluid Transition and Localization in the Bose Glass Phase." Institut fuer Theoretische Physik, Universitaet zu Koeln, Zuelpicher Str. 77, D-50937 Koeln, GERMANY; telephone +49 221 470 4205; telefax +49 221 470 5159; e- mail kis@thp.uni-koeln.de; preprint also available at cond- mat@xxx.lanl.gov (#9703149). 67.40.-w; 74.20.Mn.

N. Murali Krishna and Keshav N. Shrivastava, "Transition Temperature of a Superconductor with Defects in the Crystal Structure: Application to Cu-O Layers and KxRb3-xC60 Type Systems." Submitted to Supercond. Sci. & Technol. School of Physics, University of Hyderabad, P.O. Central University, Hyderabad 500 046, INDIA; Keshav N. Shrivastava's telephone +91 40 3010-500; telefax +91 40 3010-120 or -145; e-mail knssp@uohyd.ernet.in.

Yu. A. Krotov, D.-H. Lee, and A. V. Balatsky, "Superconductivity of a Metallic Stripe Embedded in an Antiferromagnet." Department of Physics, University of California at Berkeley, Berkeley, CA 94720; A. V. Balatsky's telephone at Los Alamos National Laboratory (505) 665-0077; telefax (505) 665-4063; e-mail avb@viking.lanl.gov; preprint also available at cond-mat@xxx.lanl.gov (#9705031).

S. P. Kruchinin and S. K. Patapis, "Specific Heat of Antiferromagnetic Spin Fluctuations in Cuprate Superconductors." To be published in Physica C: the Proc. of the 5th Int. Conf. on Mater. and Mech. of Supercond. -- High-Temp. Supercond. (M^2S-HTSC V), Beijing, People's Republic of China, Feb. 28-Mar. 4, 1997. Bogolyubov Institute for Theoretical Physics, Ukrainian Academy of Sciences, Metrologicheskaya 14-b, 252143 Kiev, UKRAINE; telephone +380 44 266 5362; e-mail kruchitp@gluk.apc.org.

N. Kumar, T. P. Pareek, and A. M. Jayannavar, "Normal-State c-Axis Resistivity of the High-Tc Cuprate Superconductors." To be published in Mod. Phys. Lett. B. Raman Research Institute, Bangalore 560080, INDIA; A. M. Jayannavar's e-mail in Bhubaneswar, India, jayan@iop.ren.nic.in; preprint also available at cond-mat@xxx.lanl.gov (#9704242).

E. Z. Kurmaev, A. V. Ezhov, V. M. Cherkashenko, S. N. Shamin, S. Bartkowski, M. Neumann, and Anup K. Gangopadhyay, "Electronic Structure of YNi1-xCuxBC Studied by X-ray Emission and Photoelectron Spectroscopy." Submitted to Solid State Commun. Institute of Metal Physics, Russian Academy of Sciences, Ural Division, 620219 Yekaterinburg GSP-170, RUSSIA; e-mail kurmaev@ifmlrs.intec.ru.

Kenneth Leong, Janina Mazierska, and Jerzy Krupka, "Measurements of Unloaded Q-Factor of Transmission Mode Dielectric Resonators." To be presented at the 1997 IEEE MTT-S Int. Microwave Symp., Denver, Colo., June 8-13, 1997. Department of Electrical and Computer Engineering, James Cook University of North Queensland, Townsville, Queensland 4811, AUSTRALIA; Janina Mazierska's telephone +61 77 81-4199 or -4299; telefax +61 77 25-1348; e-mail janina.ceremuga@jcu.edu.au.

H. Q. Li, R. H. Ono, L. R. Vale, D. A. Rudman, and S. H. Liou, "High Temperature Superconducting Josephson Junctions in a Stacked Bicrystal Geometry." Submitted to Appl. Phys. Lett. Contact R. H. Ono, Division 814.03, National Institute of Standards and Technology, 325 Broadway, Boulder, CO 80303; telephone (303) 497-3762; telefax (303) 497-3042; e- mail ono@boulder.nist.gov. 74.50.+r; 74.76.Bz; 85.25.Am; 85.25.Cp.

Lydia Snehalatha Lingam, "Physical Properties of Superconductors: Mossbauer Effect, Normal Resistivity and Phase Boundary." Submitted as a Ph.D. thesis (University of Hyderabad). Contact Keshav N. Shrivastava, School of Physics, University of Hyderabad, P.O. Central University, Hyderabad 500 046, INDIA; telephone +91 40 3010-500; telefax +91 40 3010-120 or -145; e-mail knssp@uohyd.ernet.in.

C.-J. Liu, J. Gao, A. B. Kaiser, N. T. Kemp, J. E. Downes, and M. P. Staines, "YBa2Cu3O7-d Oriented Thin Films and Magnetically Aligned Ceramic: Measurement of Anisotropic Thermopower." To be published in Physica C (in press). Contact A. B. Kaiser, Department of Physics, Victoria University of Wellington, P.O. Box 600, Wellington, NEW ZEALAND; telefax +64 4 495 5237; e-mail alan.kaiser@vuw.ac.nz. Key words: thermoelectric power, anisotropic superconductor, cuprates, thin films. 74.72.Bk; 74.76.Bz; 74.25.Fy.

Z. W. Lu and Barry M. Klein, "Anharmonic Effects in the A15 Compounds Induced by Sublattice Distortions." Submitted to Phys. Rev. Lett. Department of Physics, University of California, Davis, CA 95616; Barry M. Klein's telephone (916) 752-5989; telefax (916) 752-4717; e-mail klein@ucdphy.ucdavis.edu. 62.20.Dc; 74.25.Jb; 74.25.Kc; 74.70.Ad.

N. Luetke-Entrup, B. Placais, P. Mathieu, and Y. Simon, "On the Nature of the Depinning Transition in Type-II Superconductors." Submitted to Phys. Rev. Lett. Laboratoire de Physique de la Matiere Condensee de l'Ecole Normale Superieure, CNRS URA 1437, 24 rue Lhomond, F-75231 Paris Cedex 5, FRANCE; B. Placais' e-mail bernard.placais@physique.ens.fr; preprint also available at cond-mat@xxx.lanl.gov (#9705017). 74.60.Ge; 74.25.Nf.

A. Malinowski, Marta Z. Cieplak, A. S. van Steenbergen, J.A.A.J. Perenboom, K. Karpinska, M. Berkowski, S. Guha, and P. Lindenfeld, "Magnetic-Field Induced Localization in the Normal State of Superconducting La2-xSrxCuO4." Institute of Physics, Polish Academy of Sciences, PL-02668 Warsaw, POLAND; P. Lindenfeld's telephone at Rutgers University (908) 445-2536; telefax (908) 445-4343; e-mail lindenf@physics.rutgers.edu; preprint also available at cond- mat@xxx.lanl.gov (#9705138).

J. Marfaing, S. Regnier, J. M. Debierre, and C. Caranoni, "Insulating- Superconducting Transitions in New Ferroelectric-Superconductor Composites: Pb2(ScTa)O6-YBa2Cu3O7-d." To be published in Physica C. Laboratoire Materiaux Organisation et Proprietes, Associe CNRS, Universite Aix-Marseille III, Case 151, F-13397 Marseille Cedex 20, FRANCE; telephone +33 4 9128 8313; telefax +33 4 9128 8775; e-mail marfaing@matop.u-3mrs.fr.

Janina Mazierska, "Dielectric Resonator as a Possible Standard for Characterization of High Temperature Superconducting Films for Microwave Applications." Presented at the 4th Symp. on High Temp. Supercond. in High Frequency Fields, Pacific Grove, Calif., Sept. 27-Oct. 2, 1996; to be published in J. Supercond. Department of Electrical and Computer Engineering, James Cook University of North Queensland, Townsville, Queensland 4811, AUSTRALIA; telephone +61 77 81-4199 or -4299; telefax +61 77 25-1348; e-mail janina.ceremuga@jcu.edu.au. Key words: dielectric resonator, HTS films, surface resistance, microwave properties.

T. Meignan, A. Banerjee, J. Fultz, and P. J. McGinn, "Effects of Ce- Based Additions During Texturing of YBa2Cu3O7-d." Submitted to Physica C. Contact P. J. McGinn, Department of Chemical Engineering, 182 Fitzpatrick Hall, University of Notre Dame, Notre Dame, IN 46556-5637, telephone (219) 631-5580; telefax (219) 631-8366. Key words: grain alignment (texturing), crystal growth, YBa2Cu3O6+x, CeO2, BaCeO3.

T. Meignan and P. McGinn, "The Effect of Platinum Additions on Y2BaCuO5 Precipitation and Coarsening During Melt Texturing of YBa2Cu3O7-d." Submitted to Supercond. Sci. & Technol. Contact P. McGinn, Department of Chemical Engineering, 182 Fitzpatrick Hall, University of Notre Dame, Notre Dame, IN 46556-5637, telephone (219) 631-5580; telefax (219) 631- 8366.

C. R. Michel and N. Casan-Pastor, "Electrochemical Oxidation of La2CuO4 in Fused Nitrates." To be published in Physica C (in press). Contact N. Casan-Pastor, Instituto de Ciencia de Materiales de Barcelona, C.S.I.C., Campus U.A.B., Bellaterra E-08193 Barcelona, SPAIN; telephone +34 93 580 1853; telefax +34 93 580 5729. Key words: La2CuO4, molten salts, electrochemical oxidation, peroxide-superoxide.

S. Miura, K. Hashimoto, F. Wang, Y. Enomoto, and T. Morishita, "Structural and Electrical Properties of Liquid Phase Epitaxially Grown Y1Ba2Cu3Ox Films." To be published in Physica C (in press). Superconductivity Research Laboratory, International Superconductivity Technology Center (ISTEC), 10-12 Shinonome 1-chome, Koto-ku, Tokyo 135, JAPAN; telephone +81 3 3536 5713; telefax +81 3 3536 5714.

M. Muralidhar, H. S. Chauhan, T. Saitoh, K. Segawa, K. Kamada, and M. Murakami, "Grain Growth and Superconducting Properties of (Sm,Eu,Gd)-Ba- Cu-O." 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 or -9016; telefax +81 19 635-9017; e-mail miryala@istec.or.jp. Key words: (Sm-Eu-Gd)123, large grain, melt process, sharp transition (Tc).

R. Nemetschek, M. Opel, C. Hoffmann, P. F. Mueller, R. Hackl, H. Berger, L. Forro, A. Erb, and E. Walker, "Pseudogap and Superconducting Gap in the Electronic Raman Spectra of Underdoped Cuprates." To be published in Phys. Rev. Lett. Walther-Meissner-Institut fuer Tieftemperaturforschung, Bayerischen Akademie der Wissenschaften, D- 85748 Garching, GERMANY; R. Hackl's telephone +49 89 289 14218; telefax +49 89 289 14206; e-mail hackl@lrz.badw-muenchen.de. 74.25.Gz; 74.72.- h; 78.30.Er.

S. K. Patapis and Sergei P. Kruchinin, "Fluctuation Conductivity Behavior in Thin Films of YBaCuO Indicates s-Wave Pairing." To be published in Physica C: Proc. of the 5th Int. Conf. on Mater. and Mech. of Supercond. -- High-Temp. Supercond. (M^2S-HTSC V), Beijing, People's Republic of China, Feb. 28-Mar. 4, 1997. Solid State Physics Section, Department of Physics, University of Athens, Panepistimiopolis, GR-15784 Athens, GREECE; telephone +30 1-728 4388; telefax +30 1-725 7689 or -360 2145.

S. K. Patapis, D. Yarmis, A. Kantas, A. Karaiskos, N. Adamopoulos, G. Wagner, R. Herzog, and Sergei P. Kruchinin, "Paraconductivity Along c- Axis Direction in a Plane of a Thin Film of YBaCuO." To be published in J. Low Temp. Phys. Solid State Physics Section, Department of Physics, University of Athens, Panepistimiopolis, GR-15784 Athens, GREECE; telephone +30 1-728 4388; telefax +30 1-725 7689 or -360 2145.

S. K. Patapis, D. Yarmis, Ch. Katsoura, G. Wagner, R. Herzog, R. E. Somekh, and S. Kruchinin, "Paraconductivity and Dimensionality Along Two Different Directions in a Plane of a Thin Film of YBaCuO with c-Axis in it." To be published in Physica C: the Proc. of the 5th Int. Conf. on Mater. and Mech. of Supercond. -- High-Temp. Supercond. (M^2S-HTSC V), Beijing, People's Republic of China, Feb. 28-Mar. 4, 1997. Solid State Physics Section, Department of Physics, University of Athens, Panepistimiopolis, GR-15784 Athens, GREECE; telephone +30 1-728 4388; telefax +30 1-725 7689 or -360 2145.

B. Placais, N. Luetke-Entrup, P. Mathieu, and Y. Simon, "Comment on 'Complex Resistivity Spectra and the Shear Modulus of the Vortex Solid in Untwinned YBa2Cu3O7.'" Submitted to Phys. Rev. Lett. Laboratoire de Physique de la Matiere Condensee de l'Ecole Normale Superieure, CNRS URA 1437, 24 rue Lhomond, F-75231 Paris Cedex 5, FRANCE; e-mail bernard.placais@physique.ens.fr.

E. Sudhakar Reddy and T. Rajasekharan, "Origin of Subgrain Structure Within a Domain in Melt-Processed YBa2Cu3O7." To be published in Phys. Rev. B. Defence Metallurgical Research Laboratory, P.O. Kanchanbagh, Hyderabad 500 058, INDIA; T. Rajasekharan's telefax +91 40-239683 or -218439; e-mail vsbsp@uohyd.ernet.in. 74.72.Bk; 74.80.Bj; 74.60.Jg; 81.30.Fb.

J. Roehler, P. W. Loeffen, K. Conder and E. Kaldis, "Local Structure Study of the Underdoped-Overdoped Transition in YBa2Cu3Ox (x=6.806- 6.984) by Yttrium EXAFS." To be published in Physica C: Proc. of the 5th Int. Conf. on Mater. and Mech. of Supercond. -- High-Temp. Supercond. (M^2S-HTSC V), Beijing, People's Republic of China, Feb. 28- Mar. 4, 1997. Universitaet zu Koeln, II. Physikalisches Institut, Zuelpicherstr. 77, D-50937 Koeln, GERMANY; e-mail abb12@rs1.rrz.uni- koeln.de.

Robert E. Rudd and Warren E. Pickett, "Single Spin Superconductivity: Formulation and Ginzburg-Landau Theory." Submitted to Phys. Rev. B. Naval Research Laboratory, Washington, DC 20375-5345; e-mail rudd@dave.nrl.navy.mil; preprint also available at cond-mat@xxx.lanl.gov (#9704175).

Richard D. Saam, "Superconductivity, the Structure Scale of the Universe." Technical Report 0915963. Proteus Systems, Inc., 525 Louisiana Ave., Corpus Christi, TX 78404; telephone (512) 855-1265; telefax (512) 888-5834; e-mail rdsaam@worldnet.att.net; preprint also available at physics@xxx.lanl.gov (#9705007).

Masahiro Sakai, Akihiro Odagawa, Hideaki Adachi, and Kentaro Setsune, "Investigation of I-V Characteristics of Intrinsic Josephson Junctions in Bi-2223 Thin Films." To be published in Physica C: Proc. of the 1997 Int. Symp. on Intrinsic Josephson Effect and THz Plasma Oscillations in High-Tc Supercond., Sendai, Japan, Feb. 23-25, 1997. Central Research Laboratories, Matsushita Electric Ind. Co., Ltd., 3-4 Hikaridai, Seika, Soraku, Kyoto 61902, JAPAN; e-mail sakai@crl.mei.co.jp.

J. Sanchez-Canizares and F. Sols, "Transport in Normal-Superconductor- Normal Structures with Local Conservation of Current." Departamento de Fisica Teorica de la Materia Condensada, C-V, and Instituto Universitario de Ciencia de Materiales "Nicolas Cabrera", Universidad Autonoma de Madrid, E-28049 Madrid, SPAIN; e-mail jsc@nuria.fmc.uam.es; preprint also available at cond-mat@xxx.lanl.gov (#9705034). 74.40.+k; 74.50.+r; 74.80.Fp; 74.90.+n.

H. Sato, M. Naito, and H. Yamamoto, "Superconducting Thin Films of La2CuO4+d by Oxygen Doping Using Ozone." To be published in Physica C. NTT Basic Research Laboratories, 3-1 Morinosato Wakamiya, Atsugi-shi, Kanagawa 243-01, JAPAN; telephone +81 462 40 3532; telefax +81 462 70 2364; e-mail hisashi@will.brl.ntt.co.jp. Key words: superconductivity, La2CuO4+d, thin films, oxidation, ozone, strain effect, surface analysis.

Y. Sato, I. Terasaki, and S. Tajima, "Seebeck Effect in the Mixed State of the 60-K Phase of Single-Crystal YBa2Cu3Oy." To be published in Phys. Rev. B (in press). 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. 74.25.Fy; 74.25.Ha; 74.72.Bk.

A. Schilling, R. A. Fisher, N. E. Phillips, U. Welp, W. K. Kwok, and G. W. Crabtree, "Anisotropic Latent Heat of Vortex-Lattice Melting in Untwinned YBa2Cu3O7-d." To be published in Phys. Rev. Lett. Contact A. Schilling, c/o N. E. Phillips, Department of Chemistry, University of California, Berkeley, CA 94720-1460; telephone (510) 642-2971; telefax (510) 642-2835; e-mail 102757.505@compuserve.com. 74.25.Bt; 74.60.Ge; 75.30.Gw.

Th. Schuster, H. Kuhn, E. H. Brandt, and S. Klaumuenzer, "Flux Penetration into Flat Rectangular Superconductors with Anisotropic Critical Current." To be published in Phys. Rev. B. Contact E. H. Brandt, Max-Planck-Institut fuer Metallforschung, Postfach 800665, D- 70506 Stuttgart, GERMANY. 74.60.Ec; 74.60.Jg.

J. Shimoyama, Y. Nakayama, K. Kitazawa, K. Kishio, Z. Hiroi, I. Chong, and M. Takano, "Strong Flux Pinning up to Liquid Nitrogen Temperature Discovered in Heavily Pb-Doped and Oxygen Controlled Bi2212 Single Crystals." To be published in Physica C. Department of Superconductivity, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, JAPAN; telephone +81 3 3812 2111, ext. 7777; telefax +81 3 5689 0574; e-mail tshimo1@hongo.ecc.u-tokyo.ac.jp.

T. Strohm and M. Cardona, "Determination of the s-Wave/d-Wave Gap Ratio in YBa2Cu3O7 from Electronic Raman Scattering and the LMTO Band Structure." Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstr. 1, D-70569 Stuttgart, GERMANY. Key words: high-Tc superconductors, electronic band structure, optical properties, inelastic light scattering.

Francesco Tafuri, "Variation of the Josephson Current with Carrier Concentration in the Barrier." To be published in Phys. Rev. B (in press). INFM-Dipartimento di Scienze Fisiche, Universita di Napoli "Federico II", Piazzale Tecchio 80, I-80125 Napoli, ITALY; telephone +39 81 768 2429; telefax +39 81 239 1821; e-mail tafuri@axpna1.na.infn.it. 74.50.+r.

F. Tafuri, S. Shokhor, B. Nadgorny, F. Lombardi, A. Di Chiara, and M. Gurvitch, "Electron Beam Irradiation of Y1Ba2Cu3O7-x Grain Boundary Josephson Junctions." To be published in Appl. Phys. Lett. INFM- Dipartimento di Scienze Fisiche, Universita di Napoli "Federico II", Piazzale Tecchio 80, I-80125 Napoli, ITALY; telephone +39 81 768 2429; telefax +39 81 239 1821; e-mail tafuri@axpna1.na.infn.it. 74.50.+r; 74.72.Bk; 74.76.Bz; 85.25.Cp.

M. A. Teplov, Yu. A. Sakhratov, A. V. Dooglav, A. V. Egorov, E. V. Krjukov, and O. P. Zaitsev, "Stripe Motion in CuO2 Planes of Y1- xPrxBa2Cu3O7 as Seen from the Cu(2) NQR." To be published in JETP Lett. Kazan State University, 420008 Kazan, RUSSIA; e-mail mikhail.teplov@ksu.ru; preprint also available at cond-mat@xxx.lanl.gov (#9705061). 61.72.Hh; 74.72.Bk; 74.80.-g; 76.60.Gv.

C. V. Tomy, G. Balakrishnan, and D. McK. Paul, "Observation of the Peak Effect in the Superconductor Ca3Rh4Sn13." Submitted to Phys. Rev. B. Department of Physics, University of Warwick, Coventry CV4 7AL, UNITED KINGDOM; telephone +44 1203 523523, ext. 2238 or +44 1203 523356; telefax +44 1203 692016; e-mail phryj@csv.warwick.ac.uk.

G. Triscone, M. S. Chae, M. C. de Andrade, and M. B. Maple, "Magnetic Properties of the Bi1.95Sr2.05-xLaxCuOy (Bi-2201) Superconducting Phase." Submitted to Physica C. Department of Physics and Institute for Pure and Applied Physical Sciences, University of California at San Diego, La Jolla, CA 92093; e-mail triscone@physics.ucsd.edu. Key words: Bi-2201, magnetization, mixed state, fluctuation, penetration depth, upper critical field.

Carsten Wengel and A. Peter Young, "A Common Universality Class for the Three-Dimensional Vortex Glass and Chiral Glass?" Department of Physics, University of California, Santa Cruz, CA 95064; e-mail wengel@theorie.physik.uni-goettingen.de; Web site http://theorie.physik.uni-goettingen.de/~wengel; preprint also available at cond-mat@xxx.lanl.gov (#9704169). 75.50.Lk; 75.40.Mg; 74.60.-w; 05.50.+q.

Yasuji Yamada, Yusuke Niiori, Izumi Hirabayashi, and Shoji Tanaka, "Liquid Phase Epitaxy of Crystalline REBa2Cu3O6+d Films on Reactive Substrates Using the BaF2-BaO-CuO Flux." To be published in Physica C (in press). Superconductivity Research Laboratory, International Superconductivity Technology Center (ISTEC), 4-1 Mutsuno 2-chome, Atsuta-ku, Nagoya 456, JAPAN; telephone +81 52 871 4002; telefax +81 52 871 4090. Key words: REBa2Cu3O6+d, liquid phase epitaxy, thick film, phase relations, reaction. 74.72.-h; 81.15.Lm; 81.30.Dz.

Alexandre M. Zagoskin, "Half-Periodic Josephson Effect in an s-Wave Superconductor--Normal Metal--d-Wave Superconductor Junction." Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, British Columbia, V6T 1Z1 CANADA, e- mail zagoskin@physics.ubc.ca; preprint also available at cond- mat@xxx.lanl.gov (#9702123).

Xingjiang Zhou, V. G. Hadjiev, M. Cardona, Q. M. Lin, and C. W. Chu, "Strong Electron-Phonon Interactions in HgBa2Ca3Cu4O10+d Superconductor." To be published in Phys. Status Solidi. Max-Planck- Institut fuer Festkoerperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, GERMANY.

Marco Zoli, "c-Axis Resistivity in High-Tc Superconductors." To be published in Phys. Rev. B. Dipartimento di Matematica e Fisica, Universita di Camerino, Via Madonna delle Carceri, I-62032 Camerino, ITALY; e-mail zoli@camserv.unicam.it. 74.25.Fy; 74.20.Mn; 71.38.+i; 63.20.Pw.

Igor Zutic and Oriol T. Valls, "Superconducting Gap Node Spectroscopy Using Nonlinear Electrodynamics." Submitted to Phys. Rev. B. School of Physics and Astronomy and Minnesota Supercomputer Institute, University of Minnesota, Minneapolis, MN 55455-0149. 74.25.Nf; 74.20.De.

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

*Sept. 14 - 18, 1997: Conference on Spectroscopies in Novel Superconductors (SNS '97), Sea Crest Oceanfront Resort and Conference Center, Falmouth, Cape Cod, Mass. Conference sponsored by the College of Arts and Sciences as part of centennial celebration of the founding of Northeastern University. Abstract and registration deadline, July 1, 1997. For further information, contact Phyllis Mitzman, Conference Coordinator, The Barnett Institute, Mugar 341, Northeastern University, Boston, MA 02115; telefax (617) 373-8277; e-mail scs97@ neu.edu; Web site http://www.conf.neu.edu/sns97.

*Oct. 6 - 10, 1997: The Eighth Workshop on rf Superconductivity, Abano Terme (Padova), Italy. Workshop is planned as a forum for novel ideas and to provide channels of communication between accelerator scientists and industries concerned with advanced technologies. Papers from the whole field will be presented, including high-energy and heavy-ion machines as well as cyclotrons and FELs. Experience with resonators in existing superconducting accelerators will be reported. Will also cover future programs dealing with high-intensity structures that are of emerging interest to the community. Special section of the workshop to be dedicated to non-accelerator applications of rf superconductivity such as novel microwave devices (both low Tc and high Tc). Abstract deadline, June 13, 1997; early registration deadline, July 25, 1997. Proceedings to be published. Invited papers to be published as a special issue of Particle Accelerators. For information, contact A. Lombardi, The Eighth Workshop on rf Superconductivity, INFN LNL Via Romea 4, Legnaro (Padua) Italy; telephone +39 49-8068 358; telefax +39 49-641925; e-mail alombardi@lnl.infn.it.

*Oct. 27 - 30, 1997: 10th International Symposium on Superconductivity (ISS'97), Gifu, Japan. Organized by the International Superconductivity Technology Center (ISTEC). Symposium will consist of oral and poster sessions and invited talks in the following fields of superconductivity: physics -- theory, physical properties, and new measurement techniques; chemistry -- new materials and syntheses, substitution, solid-state chemistry, and properties; flux pinning -- mechanism and electromagnetic properties of fluxoids; wires, tapes, and bulk -- solid-state powder ceramics, chemical-solution processing, melting solidification, and chemical-vapor deposition; thin films -- processing, properties, and lithography; device applications -- digital, analog, SQUID, and other electronic devices; system applications -- power, power transportation, magnets, magnetic shields, and other system applications. Application deadline, June 30, 1997. Proceedings to be published. Official language is English. For further information, contact ISS'97 Secretariat, ISTEC, Eishin Kaihatsu Bldg. 6F, 34-3 Shimbashi 5-chome, Minato-ku, Tokyo 105, Japan; telephone +81 3 3431-4002; telefax +81 3 3431-4044.

*Jan. 6 - 9, 1998: 7th Joint MMM-Intermag Conference, San Francisco, CA. Conference will include all basic and applied science technology related to magnetism. The technical subject categories are: cooperative phenomena and fundamental magnetic properties, transport properties, computational magnetics and imaging, soft magnetic materials and applications, hard magnetic materials and applications, other materials, artificially structured materials, magnetic recording, and interdisciplinary topics and applications. Invited talks, oral presentations, and poster sessions. Exhibition of services, equipment, and materials. Abstract deadline, July 9, 1997. Proceedings to be published in special issues of J. Appl. Phys. and IEEE Trans. on Mag. For further information, contact Diane Suiters or Amy Landsbaum, Conference Coordinators, 655-15th Street N.W., Suite 300, Washington, DC 20005; telephone (202) 639-5088; telefax (202) 347-6109; e-mail magnetism@courtesy.assoc.com. Technical questions regarding abstracts should be directed to one of the Program Chairs: Alison Chaiken, Mailstop L-350, Lawrence Livermore Laboratory, Livermore, CA 94550, telephone (510) 422-7129, telefax (510) 422-6892, e-mail chaiken@llnl.gov; or Toasz Jagielinski, Eastman Kodak Company, 3985 Sorrento Valley Boulevard, San Diego, CA 92121, telephone (619) 535- 6908, telefax (619) 535-6990, e-mail tmj@kodaksdl.com.

March 12 - 13, 1998: JFCC International Workshop in Fine Ceramics '98 -- Ceramics Material Systems with Composite Structure, Nagoya, Japan. Topics include fabrication and processing; microstructure control, characterization, and design interface/interface control, characterization, and design; mechanical and functional characterization; and testing methods and nondestructive evaluation. Papers are solicited. Abstract deadline August 31, 1997. Proceedings to be published in Ceramic Transactions. Official language is English. For information, contact Noriyuki Kosuge, c/o JFCC, 2-4-1 Mutsuno, Atsuta, Nagoya 456, Japan; telephone +81 52 871-3500; telefax +81 52 871-3599.

*March 29 - April 3, 1998: Symposium on Applications of Spectroscopy to Superconducting Materials, 215th Spring National American Chemical Society Meeting, Dallas, Texas. Call for papers. Topics will include oral sessions of optical spectroscopies, photoexcitation spectra, other spectra, and applications. The meeting is not restricted to cuprates and may include studies of organic superconductors, fullerides, heavy fermions, and conventional materials. Proceedings to be published. Abstract deadline, September 1, 1997. Contact E. Faulques, Institut the Materiaux, LPC, 2 rue de la Houssiniere, BP 32229, F-44322 Nantes Cedex 3, France; telephone +33 2 40 373972; telefax +33 2 40 373991; e-mail faulques@cnrs-imn.fr; Web site http://www.acs.org/.

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

RESOURCES

Information

New Book: The Physics of Superconductors: Introduction to Fundamentals and Applications, by V. V. Schmidt, edited by P. Mueller and A. Ustinov. Covers key topics in superconductivity such as Ginzburg-Landau theory, Josephson effects, SQUIDs, and the BCS theory. Written primarily as a graduate-level text. Chapter titles are: Introduction, Linear Electrodynamics of Superconductors, Ginzburg-Landau Theory, Weak Superconductivity, Type-II Superconductors, Microscopic Theory of Superconductivity, High-Tc Superconductivity, Latest Applications, and References. Contains several problems (with accompanying solutions). Publ. 1997; 220 pp.; price $69; ISBN 3-540-61243-2. Contact Springer- Verlag New York Inc., 175 Fifth Avenue, New York, NY 10010; telephone (800) springer; telefax (212) 533-3503; e-mail custserv@springer-ny.com.

Technical Report: The Status of Progress Toward High Amperage Conductors Incorporating High-Temperature Superconductors, by A. M. Wolsky. Sponsored by the International Energy Agency. Report is intended for research and development (R&D) managers in government, electric utilities, private firms, and national laboratories who want an overview of what is being done and what remains to be done in this technology area. Readers are assumed to be acquainted with superconductivity but not be experts on the topics discussed. Contents are divided into a) Preface; b) Introduction -- varieties of superconductors, the E vs. J curve, HTS wire and tape, comparison of HTS tape with copper, relation of electrical parameters to properties on the atomic scale, relation of electrical parameters to ambient condition, critical state model, and ac losses; c) Groups Active in the Field; d) Ceramic Superconductors -- includes YBCO, BSCCO, andTBCCO; e) Difficulties to be Surmounted -- mechanical, electrical, mutual compatibility, manufacturability, and cost problems; f) How Conductors are Made -- overview, production of oxide powder, powder-in-tube approach to tape production, metallic precursor approach to wire and tape production, electrophoretic deposition for wire and tape production, films on substrates (coated conductors) including discussion and comparisons of the IBAD and RaBiTS techniques; g) Accomplishments and Status; and h) What Remains to be Done. Several nice tables and graphs. References to the research literature also provided for further reading. For information, contact Alan M. Wolsky, Operating Agent for IEA Task and Director, Office of Industrial R&D Partnerships, Energy Systems Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439; telephone (630) 252-3783; telefax (630) 252-1677.

FYI (High-Tc Update takes no responsibility for want ads listed in this section.)

Position Available: A postdoctoral position is currently available to fabricate, process, and characterize Ag-sheathed BSCCO conductors (2212). Successful candidates must have a strong background in synthesis of HTS powders, fabrication and processing of conductor forms, characterization of microstructure using light and electron optical techniques, and measurement of electromagnetic properties. Candidates should also be able to design an independent research program, guide graduate students, and work productively in collaborations with colleagues in the Applied Superconductivity Center, national laboratories, and industry. Strong written and oral communication skills are required. Interested candidates please send a resume and list of references to Eric Hellstrom, Applied Superconductivity Center, University of Wisconsin-Madison, 1500 Engineering Drive, Madison, WI 53706; telephone (608) 263-9462; telefax (608) 263-1087; e-mail hellstrom@engr.wisc.edu.

Position Wanted: Recent Ph.D. recipient seeks position in the U.S. Publications in several peer-reviewed journals on the following topics: recoilless emission, Doppler shift in Mossbauer spectra, normal resistivity, effect of electric field on superconducting films, and theoretical calculation of dendritic phases of superconductors. Contact Lydia S. Lingam, School of Physics, University of Hyderabad, Hyderabad 500 046, India; telephone +91 40 3010120; telefax +91 40 3010145; e-mail knssp@uohyd.ernet.in.

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, #11, June 1, 1997.