HIGH-Tc UPDATE E-MAIL VERSION, VOL. 11, NO. 8, April 15, 1997.

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, and other agencies, organizations, and individuals.

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Intrinsic Josephson Junctions

The experimental observation of moving Josephson vortices in mesa structures patterned on the surface of Bi2Sr2CaCu2O8+d (Bi-2212) single crystals is reported by G. Hechtfischer (Erlangen) et al. The mesas formed stacks of typically 100 intrinsic Josephson junctions. In magnetic fields parallel to the superconducting copper-oxide layers, a flux-flow branch was found to develop on the current- voltage characteristics. The authors also observed a microwave emission signal whose properties provide evidence that the displaced linear branch is a consequence of the motion of Josephson vortices. All the results can be understood as arising from collective Josephson vortex motion in a stack of coupled long Josephson junctions.

A preprint by J. U. Lee and J. E. Nordman (Wisconsin-Madison) shows that the c-axis transport in superconducting single-crystal Bi-2212 reveals temperature-sensitive volt-ampere characteristics near the transition temperature when a magnetic field is applied perpendicular to the current direction. A change in sign of the curvature of these characteristics correlates with changes in the hysteresis of the zero-field characteristics with temperature. This behavior is consistent with a model of Josephson vortex flow affected by an increase of damping with temperature, and provides additional justification for treatment of this material as a stack of superconductor-insulator-superconductor (SIS) tunnel junctions.

The effects of columnar defects on the Josephson plasma resonance (JPR) have been investigated by T. Hanaguri (Tokyo) et al. in heavy- ion-irradiated Bi-2212. In dc magnetic fields perpendicular to the layers, a microwave magnetoabsorption peak caused by the JPR was found to shift to higher fields with increasing defect densities. The amount of the shift indicated that the interlayer coupling was enhanced even at fields above the matching field of the columnar defects. A second absorption peak, observed around the matching field, is attributed to a JPR caused by the nonmonotonic field dependence of the interlayer critical current density. The results indicate that the JPR resonance can be strongly altered even by a small number of columnar defects. Closely related results are contained in a preprint by Y. Tsuchiya (Tokyo) et al.

A paper by A. Maeda (Tokyo) et al. reports on JPR experiments in the mixed state of Bi2(Sr,La)2CuOy (Bi-2201). The authors studied the plasma frequency omega_p as a function of temperature, magnetic field, and doping. In underdoped crystals, the resonance field at 15.7 GHz was found to be of the order of 100 G, which corresponds to a large anisotropy (gamma ~ 750). No definite resonance was found in overdoped Bi-2201.

A theoretical paper by A. Golub and B. Horovitz (Ben-Gurion) reports studies of a vortex lattice that is parallel to superconducting layers, allowing for dislocations and disorder with both short and long wavelengths. The authors find that the long-wavelength disorder has a significant effect on the phase diagram, producing a first- order transition and melting at strong disorder. This then permits the Friedel scenario, in which a layered superconductor becomes a set of decoupled 2D superconductors.

Vortices

As reported by J. R. Cooper (IRC-Cambridge) et al., the irreversibility line H_[irr](T) and the reversible magnetization of twinned YBa2Cu3O7-d crystals both show 3D XY scaling. Analyzing this result and noticing a correlation between the condensation energy and H_[irr](T) of oxygen-deficient YBa2Cu3O7-d for 0 < d < 0.6, the authors suggest that H_[irr](T) and the vortex-lattice melting line H_m(T) are strongly influenced by critical fluctuations. The authors propose that H_m(T) and the upper limit to H_[irr](T) are identical, and that they could represent an upper critical field line that has been suppressed by thermodynamic fluctuations.

Using a frustrated XY model on a lattice with open boundary conditions, S. Ryu and D. Stroud (Ohio State) have numerically studied the magnetization change near the vortex-lattice melting transition in low magnetic fields. In both two and three dimensions, the authors find that the melting transition is followed at a higher temperature by the onset of large dissipation associated with the zero-field XY transition. It is characterized by the proliferation of vortex-antivortex pairs in 2D or vortex loops in 3D. At the upper transition, there is a sharp increase in the magnetization, in qualitative agreement with recent local Hall-probe experiments. The authors thus can explain the large experimentally observed value of the entropy per pancake at low fields, as well as the question of the line-liquid phase in a limited region of the phase diagram.

A dynamic instability in the ac response of the vortex-solid phase just below the melting line has been observed in YBa2Cu3O7-d by W. K. Kwok et al. (Argonne). The authors find that the instability takes the form of voltage oscillations whose frequencies are much lower than that of the driving current. For example, the oscillation frequency varies from 0.007 Hz to 0.05 Hz, depending on the amplitude of the driving current, at a driving frequency of 23 Hz. The authors suggest that the oscillations may arise from the interplay of driving and pinning forces, mediated by the elasticity of the solid, which enable long-range dynamic correlation and long-time relaxation effects.

Pinning by splayed defects has been studied by W. K. Kwok et al. (Argonne) using transport measurements of vortex motion both perpendicular and parallel to the splay plane in untwinned single crystals of YBa2Cu3O7-d. Splayed defects were created by heavy-ion irradiation using 3.9 GeV [197]^Au^[29+] ions with a fluence of 4.8 x 10^[14] ions/m^2 at a splay angle of +-10 degrees from the crystallographic c axis. The authors compared the transport properties of the crystals before and after irradiation and found (a) a 1/H dependence of the vortex-liquid pinning energy, (b) a crossing of the irreversibility lines before and after irradiation, and (c) a stronger temperature dependence of the critical current for vortex motion perpendicular to the splay plane than for motion parallel to the splay plane.

Muon-spin rotation (muSR) spectroscopy has been used by J. E. Sonier (TRIUMF) et al. to measure the internal magnetic field distribution in 2H-NbSe2 for H_[c1] << H < 0.25 H_[c2]. The deduced profiles of the supercurrent density J_s indicate that the vortex-core radius rho_0 in the bulk decreases sharply with increasing magnetic field. This effect, which is attributed to increased vortex-vortex interactions, does not agree with the dirty-limit microscopic theory. The authors also find that the in-plane London penetration depth lambda_ab increases linearly with H in the vortex state of a conventional superconductor.

Theory

As reported by P. A. Lee and X.-G. Wen (MIT), there is increasing experimental evidence that the superconducting energy gap Delta_0 in the underdoped cuprates is independent of the doping concentration x, while the superfluid density is linear in x. The authors show that under these conditions, thermal excitation of the quasiparticles is very effective in destroying the superconducting state, so that Tc is proportional to xDelta_0, and part of the gap structure remains in the normal state. The authors estimate H_[c2] and predict it to be proportional to x^2. The authors also discuss to what extent the assumptions that go into the quasiparticle description can be derived in the U(1) and SU(2) formulations of the t-J model.

A study of 2+1 dimensional massless Dirac fermions and bosons coupled to a U(1) gauge field as a model for underdoped cuprates has been carried out by D. H. Kim et al. (MIT). The authors find that the uniform susceptibility and the specific heat coefficient are logarithmically enhanced (compared with the linear-in-T behavior) because of the fluctuation of the transverse gauge field, which is the only massless mode at finite boson density. The authors analyze existing data and find good agreement in the spin-gap phase. In this picture, the drop of the susceptibility below the superconducting Tc arises from the suppression of gauge fluctuations.

A preprint by B. C. den Hertog and M. P. Das (Australian National) suggests that when Zn is substituted for Cu in the copper-oxide planes of high-Tc superconductors, it does not necessarily have a valency of 2^+. Instead, the valence of a Zn impurity should be determined by the surrounding medium. To study this hypothesis, the authors examined the effect of static impurities inducing diagonal disorder within a one-band Hubbard model coupled to a localized state.

YBa2Cu3O7-d

As reported by F. Sandiumenge (Barcelona) et al., the annihilation process of large 1/6 <301> stacking faults in melt-textured YBa2Cu3O7-d has been monitored in situ in a transmission electron microscope. The authors find that the process is activated at the onset of the orthorhombic to tetragonal transition induced in the electron microscope, indicating the instability of such defects in the deoxygenated YBa2Cu3O7-d matrix. The observations suggest that the annihilation and growth process is limited by surface diffusion along Y2BaCuO5/YBa2Cu3O7-d interfaces.

Bi Cuprates

Supercurrent conduction mechanisms in BSCCO-2223 tapes are discussed in a preprint by A. P. Malozemoff et al. (American Superconductor). The authors discuss earlier "brick-wall" and "railway-switch" models and a new "freeway" model. Conduction through colony boundaries (edge-grain boundaries, or EGB's) is proposed as a significant mechanism, facilitated by c-axis current redistribution. The authors liken this process to bottlenecked "rotary junctions" and "lane changes," and they discuss "on-ramps" and "exits," which are related to mosaic spread.

Measurements of transport critical current in magnetic field, hysteresis loops, and ac susceptibility have been carried out by J. Horvat et al. (Wollongong) on Bi-2223/Ag tapes that were subjected to different degrees of mechanical deformation and were subsequently sintered. All the measurements show an increase in pinning with the degree of mechanical deformation, but this depends also on the conditions of grain growth. The authors propose that sintering helps to heal the micro- and nano-cracks that result from mechanical deformation, and results in improved pinning.

A preprint by C. Goupil (Caen) et al. reports measurements on a single crystal of Bi-2212 irradiated by heavy Pb ions with a fluence of 10^[10] cm^[-2] or B_[phi] = 0.2 T. The authors extracted activation energies U_[act](J,B,T) from current-voltage characteristics using individual (B < B_[phi]) and collective depinning processes (B > B_[phi]). Vortex-vortex interactions were described using the analogous Ekman superfluid layer. The authors observed a crossover from a field-independent activation energy below B_[phi] to a B^[-0.5] dependence at high fields.

The longitudinal elastic correlation length l_[44] of flux lines in a superconducting Bi-2212 single crystal has been measured by T. Matsushita (Kyushu Institute of Technology) et al. at temperatures 23-30 K in the low-field region near the peak effect using the Campbell method in a magnetic field parallel to the c axis. The authors found that l_[44] is longer than several micrometers, indicating that the vortices are coupled over a fairly long distance along the c axis, even in the vicinity of the peak field.

Other Cuprates

According to a preprint by J.M.S. Skakle et al. (Aberdeen), the oxygen content z of tetragonal, Ca-doped La1.5Ba1.5Cu3Oz (La-336) superconductors can be increased to values significantly greater than 7.0 by annealing in high-pressure O2. For instance, for La1.1Ba1.5Ca0.4Cu3Oz, z = 7.25 after heating at 400^oC in 350 bar O2. The critical temperature Tc of the Ca-doped compounds is found to pass through a maximum of 79 K at an average Cu valence of 2.3-2.4 and to decrease to as low as 35 K in the overdoped region of higher Cu valence.

Magnetization measurements have been carried out by J. E. Ostenson (Ames Lab, Iowa State) et al. on the stripe-phase superconductor La1.45Nd0.40Sr0.15CuO4. The authors found that this material is a good bulk superconductor but that its magnetization curves are different from those of YBa2Cu3O7-d, YBa2Cu4O8, and conventional type-II superconductors.

A preprint by P. Wochner (Brookhaven) et al. reports a study of c- axis interstitial oxygen ordering (staging) in the oxygen-rich phase of a phase-separated La2CuO4+d (d = 0.015) single crystal, using observations of satellite peaks in the neutron scattering that first appear at 250 K. The authors found that if the sample is cooled through the temperature region around 210 K over a period of several hours, these satellite peaks show splitting in the a* direction, indicating a periodic one-dimensional modulation of the in-plane order. Microscopic modeling leads to a picture where the excess oxygen, and therefore also the doped holes, order in stripes along the a direction in addition to staging along the c direction.

Preprints by J. Akimoto (National Institute of Materials and Chemical Research) et al. report the determination of the crystal structures of CuBa2Can-1CunOy, (Cu,C)Ba2Can-1CunOy (n = 4, 5, and 6), and (Cu,Hg)Ba2Ca4Cu5Oy by single-crystal x-ray structure analysis.

Two preprints by Y. Y. Xue et al. (TCSUH) report structural analyses by x-ray powder diffraction of Ba2Ca2Cu3(CaxCuy)O8+d with 0.4 <= x <= 0.9 and 0 <= y <= 0.7, which has an optimum Tc = 126 K, and Ba2Ca3Cu4(CaxCuy)O10+d, which has an optimum Tc = 118 K.

A preprint by R. S. Liu (National Taiwan) et al. reports that the zero-resistance Tc has been raised from 78 K for x = 0 to 92.5 K for x = 0.2 in the compound (Hg0.5Pb0.5)(Sr2-xBax)(Ca0.7Y0.3)Cu2O7-d, suggesting that the out-of-plane oxygen plays an important role in determining Tc.

Two layered, insulating cuprates Pb2Ba2Cu2TaO8Cl and Pb2Ba2Cu2NbO8Cl have been synthesized and characterized by LI Rukang (Hefei). The stacking sequence is Pb2Cl/CuO2/BaO/TaO2/BaO/CuO2.

Films

A preprint by J. W. Ekin (NIST-Boulder) et al. reports that a magnetic-field-dependent zero-bias conductance peak (ZBCP) is consistently observed in a wide range of superconductor/noble-metal junctions fabricated from oxide superconductors (YBa2Cu3O7-d and Tl2Ba2CaCu2O8+d) that exhibit d-wave pairing behavior. However, no measurable peak appears in similar junctions made from an s-wave oxide superconductor (Nd1.85Ce0.15CuO4). The authors consider explanations for this correlation using the Applebaum-Anderson model for magnetic interface scattering and the midgap-state model for d- wave interface states.

The infrared conductivity of CaCuO2, SrCuO2-y, and Sr0.85Nd0.15CuO2 infinite-layer films has been obtained by P. Dore (Rome) et al. from reflectivity measurements taking into account the substrate contribution. SrCuO2-y and Sr0.85Nd0.15CuO2 exhibit extra phonon modes and structured bands in the infrared, not found in stoichiometric CaCuO2. These features mirror those observed in the perovskite cuprates, providing evidence that the polaronic properties of high-Tc superconductors are intrinsic to the CuO2 planes.

As reported by C. Rossel (IBM-Zurich) et al., the in-plane torque anisotropy of the high-Tc cuprate Tl2Ba2CuO6+d (Tl-2201) shows evidence for a mixed s + d pairing state allowed by possible breaking of its tetragonal symmetry at low temperature. The validity of the result is supported by the absence of any in-plane anisotropy in the classical superconductors NbN and layered 2H-NbSe2 measured under the same conditions.

According to a preprint by L. Hao (Strathclyde) et al., the excess noise levels in HTS grain-boundary Josephson junctions, when expressed as critical current fluctuations |dI_c|, vary linearly with I_c as the temperature changes. By contrast, when the critical current is suppressed by an external magnetic field, the measured fluctuations |dI_c| remain nearly constant while I_c itself undergoes order-of-magnitude changes. The authors explain this effect in terms of the field-induced spatial modulation of the critical current density within the junction.

Applications

A surface acoustic wave (SAW) bandpass filter with center frequency 29.13 MHz and YBa2Cu3O7-d thin-film interdigital transducers (IDT's) has been fabricated by Z. H. Gong et al. (Trondheim) on a Y-cut, Z- propagation LiNbO3 substrate. The filter amplitude response and transducer admittance were measured from room temperature to 60 K, where the IDT's became superconducting. A sharp increase in the amplitude response was observed at the superconducting transition, concomitant with a reduction in the electrode sheet resistance. The total insertion loss at the center frequency dropped from -52 dB at room temperature to -20 dB at 60 K. Model calculations of the amplitude response and transducer admittance were found to be in excellent agreement with the experimental data at 60 K.

High-frequency experiments involving intrinsic Josephson junctions in mesa structures patterned on Bi2Sr2CaCu2O8+d (Bi-2212) single crystals are reported by G. Hechtfischer (Erlangen) et al. The authors investigate possible applications of intrinsic Josephson junctions as flux-flow oscillators and high-frequency mixers, the basic components in an integrated mm-wave receiver.

The application of melt-textured YBCO in superconducting current leads carrying currents in excess of 1,000 A at 77 K is discussed in a preprint by K. Salama et al. (TCSUH). Partial removal of liquid phase during melt texturing enhances the grain-boundary coupling and improves the transport critical current.

The field- and frequency-dependent ac susceptibility of melt-textured YBa2Cu3O7-d has been measured by Z. J. Yang and J. R. Hull (Argonne) at 77 K and under various ac and dc field conditions relevant to superconducting bearing systems. The ac frequencies ranged from 10 to 3,800 Hz.

Other Activities

The electrical resistivity in superconducting amorphous Mo3Si films in a perpendicular magnetic field B_0 + B_1 sin[omega-t with B_1 << B_0 has been studied by M. P. Risse (Tuebingen) et al. For B_1 = 0, a resistive voltage appeared only above the critical current, but for B_1 > 0, perfectly ohmic behavior was found at currents I << I_c(B_1 = 0), with the resistivity increasing proportional to omega and B_1. The authors explain their results in terms of the magnetic flux transferred across the sample during each cycle of the oscillatory magnetic field.

Overviews

Rare-earth and actinide compounds and the extraordinary superconducting and magnetic phenomena they exhibit are surveyed in a review article by M. B. Maple et al. (UC-San Diego). The authors discuss three classes of novel superconducting materials: high- temperature, high-field superconductors (intermetallics and layered cuprates); superconductors containing localized magnetic moments; and heavy-fermion superconductors. The authors discuss recent experiments on the resistive upper critical field of high-Tc cuprate superconductors and the peak effect in the critical current density of the f-electron superconductor CeRu2 (118 refs.).

Thermochemical and thermodynamic properties related to the high- temperature superconductors in the Y-Ba-Cu-O and Bi-Sr-Cu-O systems are reviewed by J. Sestak (Praha) et al. The authors present simulated data for the standard entropies, standard enthalpies of formation, and heat capacities in the crystalline phase (47 refs.).

An article by G. W. Crabtree (Argonne) and D. R. Nelson (Harvard) entitled "Vortex Physics in High-Temperature Superconductors" just appeared in Physics Today 50, No. 4, 38 (1997). The authors survey the equilibrium phases of vortex matter and then note the emergence of the dynamic response of vortices as an independent subject of investigation (18 refs.).

Progress in BSCCO-2223 tape technology at American Superconductor Corporation is reviewed in an article by A. P. Malozemoff et al. (ASC). Multifilamentary tape produced via a scalable rolling process has reached a superconductor critical current density Jc = 58,000 A/cm^2 at 77 K and 0 T and an engineering (full cross section including metal sheath) critical current density J_e up to 15,000 A/cm^2. Pilot manufacturing of long lengths (100-400 m) has permitted a number of prototypes, including a 200 hp ac synchronous motor, a 3,300 A (77 K) 50 m machine-stranded cable conductor, a 5 kJ SMES system, and an operational ion-beam switching magnet installed in a tandem accelerator for carbon mass spectrometry dating. The authors report ASC progress in manufacturing a tape with J_e > 8,000 A/cm^2, which should create new opportunities for more advanced prototypes and commercial development (15 refs.).

A brief review of the growth of (La,Sr)2CuO4 and (Nd,Ce)2CuO4 thin films by reactive coevaporation has been prepared by M. Naito et al. (NTT). By (a) careful adjustment of the cation stoichiometry, (b) optimum oxidation, and (c) appropriate choice of substrates, the authors have grown both c-axis and non-c-axis films of these materials (14 refs.).

A preprint by D. Pines (Illinois-Urbana) briefly reviews measurements of the dynamic spin susceptibility chi(q,omega) obtained from NMR and INS experiments and their implications in the cuprate superconductors. The author stresses that these materials should be regarded as nearly antiferromagnetic liquids, in which interactions lead inexorably to a d_[x^2-y^2] pairing state. The author distinguishes between hot quasiparticles, located near singular points on the Fermi surface that can be connected by Q_i [near Q = (pi,pi)], the wavevectors where chi(q,omega) peaks sharply; and cold quasiparticles, which are sufficiently far away from singular points that their behavior is closer to that of a strongly coupled Landau Fermi liquid (13 refs.).

Ph.D. Thesis

The use of magnetic decoration to study the vortex lattice in superconductors is described in the Ph.D. thesis of M. V. Marchevsky (Leiden). The author applied this technique to study the effects of ordering, elasticity, dimensionality, and dynamics in Bi2Sr2CaCu2O8+d (Bi-2212), NbSe2, and thin amorphous Mo3Ge films (197 refs.).

Contributed by John R. Clem

Contents: Technology News begins on page 5; Preprints begin on page 6; Coming Events are on page 15; Resources 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.

The first model of an HTS MAGLEV carrier system was demonstrated by a Chinese and German cooperative consortium at the M^2S HTSC conference held in Beijing, China (Feb. 28 - March 4, 1997). The model levitated train weighed 20 kg and traveled on a circular track of length 11.2 m with a speed of 1.8 m/s. The HTSC material used was YBCO and the tracks were fabricated from NaFeB. The vehicle traveled with an air gap of 7 mm and was propelled by a linear motor. Chinese participants include the Institute of Electrical Engineering (Academia Sinica), National Laboratory of Superconduction and Institute of Physics (Academia Sinica), Northwest Institute for Nonferrous Metal, and National Center for R&D on Superconductivity. German participants include the Institut fuer Elektrische Maschinen, Antriebe und Bahnen der TU, Braunschweig and Institut fuer Physikalische, Hochtechnologie e.V., Jena.

An operational high-temperature superconducting distribution transformer, designed and built by Asea Brown Boveri (ABB) with HTS wires developed by American Superconductor Corporation, was successfully installed in the power supply network of Geneva, Switzerland. The three-phase transformer, delivered by ABB Secheron Ltd. and placed in the Geneva electric power grid, will power the headquarters of SIG, the electric utility of Geneva, through the end of 1997. It has an output of 630 kVA and is designed to convert power from 18.7 kV to 420 V. The equipment will begin long-term performance monitoring under actual power grid conditions. For further information, contact Marianne Sabella/Kim Miller, FitzGerald Communications Inc., telephone (617) 494-9500 or Michael Robertson, ABB Corporate Communications, Zurich, Switzerland; telephone +41 1 317 7304; telefax +41 1 312 1543.

An ion-beam transport magnet, fabricated using HTS materials by American Superconductor Corp., Alphatech International (New Zealand), and Industrial Research Limited (New Zealand), was commissioned to replace a conventional magnet attached to a particle accelerator at the New Zealand Institute of Geological and Nuclear Science. Officials expect the new electromagnet to enhance the performance of the institute's $1.5-million accelerator mass spectrometer which is used in carbon dating and archeological and geophysical studies. Alphatech International is in discussion with other groups from Europe and Australia regarding the installation of HTS magnets into their accelerator systems. For further information, contact Denise Mikulis, American Superconductor Corporation, Two Technology Drive, Westborough, MA 01581; telephone (508) 836-4200; telefax (508) 836- 4248; Web site http://www.amsuper.com or Jeff Tallon, Industrial Research Ltd.; telephone +64 4 569 0000.

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.

J. Akimoto, K. Tokiwa, A. Iyo, H. Ihara, H. Hayakawa, Y. Gotoh, and Y. Oosawa, "Crystal Chemistry of CuBa2Can-1CunOy (n=4,5,6) Superconductors." To be published in Physica C (in press). National Institute of Materials and Chemical Research, 1-1 Higashi, Tsukuba, Ibaraki 305, JAPAN; telephone +81 298 54 4550; telefax +81 298 54 4550; e-mail akimoto@nimc.go.jp. Key words: CuxBa2Can-1CunOy, (Cu,C)Ba2Can-1CunOy, single-crystal x-ray structure analysis, Cu- based superconductor.

J. Akimoto, K. Tokiwa, A. Iyo, H. Ihara, K. Kawaguchi, M. Sohma, H. Hayakawa, Y. Gotoh, and Y. Oosawa, "Crystal Structure and Superconductivity in (Cu,Hg)Ba2Ca4Cu5Oy." Submitted to Physica C. National Institute of Materials and Chemical Research, 1-1 Higashi, Tsukuba, Ibaraki 305, JAPAN; telephone +81 298 54 4550; telefax +81 298 54 4550; e-mail akimoto@nimc.go.jp. Key words: (Cu,Hg)Ba2Ca4Cu5Oy, single-crystal x-ray structure analysis, Cu-based superconductor, Hg-based superconductor, solid-solution system.

A. A. Andronov, P. P. Vysheslavtsev, V. V. Kurin, I. M. Nefedov, and I. A. Shereshevskii, "Modeling of the Resistive State of Superconducting Films with Time-Dependent Ginzburg-Landau Equation." To be published in the special issue of Izvestiya Vysshikh Uchebnykh Zavedenii Fizika "Radiophysics", edited by V. L. Ginzburg. Institute for Physics of Microstructures, Russian Academy of Science, Nizhny Novgorod, GSP-105, 603600, RUSSIA; e-mail andron@ipm.sci-nnov.ru.

S. Aukkaravittayapun, P. J. King, Yu. I. Latyshev, and R. M. Bowley, "Anomalous Dependence of the Dissipation upon Magnetic Field Angle in Layered High Tc Superconductors." To be published in Physica C (in press). Contact P. J. King, Department of Physics, University of Nottingham, University Park, Nottingham NG7 2RD, UNITED KINGDOM. Key words: high Tc, BSCCO, dissipation, field angle dependence, gas and solid phases. 74.60.-w; 74.90.+n.

A. Avella, F. Mancini, D. Villani, and H. Matsumoto, "Fermi Surface and Density of States in the Two-Dimensional t-t'-U Model." Dipartimento di Fisica Teorica e S.M.S.A., Unita INFM di Salerno, Universita di Salerno, I-84081 Baronissi (SA), ITALY; F. Mancini's e- mail mancini@vaxsa.csied.unisa.it.

A. Avella, F. Mancini, D. Villani, and H. Matsumoto, "The Superconducting Gap in the Two-Dimensional Hubbard Model." Dipartimento di Fisica Teorica e S.M.S.A., Unita INFM di Salerno, Universita di Salerno, I-84081 Baronissi (SA), ITALY; F. Mancini's e- mail mancini@vaxsa.csied.unisa.it.

V.P.S. Awana, Rajvir Singh, D. A. Landinez Tellez, J. M. Ferreira, J. Albino Aguiar, and A. V. Narlikar, "Superconductivity, Synthesis and Magnetism of CaLaBaCu3-x(Zn,Fe)xO7 Tetragonal System." 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. Materials Engineering, University of Wollongong, Northfields Avenue, Wollongong NSW 2522, AUSTRALIA; telefax +61 42 213112; e-mail awana@uow.edu.au.

V.P.S. Awana, D. A. Landinez Tellez, J. M. Ferreira, J. Albino Aguiar, S. K. Malik, A. V. Narlikar, W. B. Yelon, Rajvir Singh, S. Uma, and E. Gmelin, "Superconductivity and Ordering of Pr in CaLa1- xPrxBaCu3O7 Compound." 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. Materials Engineering, University of Wollongong, Northfields Avenue, Wollongong NSW 2522, AUSTRALIA; telefax +61 42 213112; e-mail awana@uow.edu.au.

D. Babic, J. Ivkov, and B. Leontic, "Two-Dimensional Decoherence Effects in Superconducting Sheets of Single Crystal Bi2Sr2CaCu2O8+x." To be published in Physica C (in press). Department of Physics, Faculty of Science, University of Zagreb, Bijenicka cesta 32, HR- 10000 Zagreb, CROATIA; telefax +385 432 525; e-mail dbabic@phy.hr. Key words: magnetoresistance, fluctuation effects, pair breaking. 72.15.Gd; 74.40.+k; 74.72.Hs.

S. S. Banerjee, N. G. Patil, Subir Saha, S. Ramakrishnan, A. K. Grover, S. Bhattacharya, T. V. Chandrasekhar Rao, P. K. Mishra, G. Ravikumar, V. C. Sahni, C. V. Tomy, G. Balakrishnan, D. McK. Paul, and M. J. Higgins, "Thermodynamic Evidence for Reentrant Peak Effect in a Clean Single Crystal of 2H-NbSe2 and the Effect of Disorder and Thermomagnetic History on It." 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. Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, INDIA; e-mail sb@tifrvax.tifr.res.in. Key words: reentrant peak effect, vortex melting, disorder effects, metastability, 2H-NbSe2.

P. Calvani, P. Dore, S. Lupi, A. Paolone, P. Maselli, P. Giura, B. Ruzicka, S-W. Cheong, and W. Sadowski, "Small and Large Polarons in Nickelates, Manganites, and Cuprates." 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. Istituto Nazionale di Fisica della Materia and Dipartimento di Fisica, Universita di Roma "La Sapienza", Piazzale A. Moro 2, I-00185 Roma, ITALY; e-mail calvani@axcasp.caspur.it; preprint also available at cond-mat@xxx.lanl.gov (#9702194).

N. Cheggour, M. Decroux, A. Gupta, O. Fischer, J.A.A.J. Perenboom, V. Bouquet, M. Sergent, and R. Chevrel, "Enhancement of the Critical Current Density in Chevrel Phase Superconducting Wires." To be published in J. Appl. Phys. Department of Physics, Science Laboratories, University of Durham, Durham DH1 3LE, UNITED KINGDOM; telefax +44 191 374 3749; e-mail najib.cheggour@durham.ac.uk.

J. M. Chen, R. S. Liu, C. Martin, F. Letouze, and B. Raveau, "Hole States in Oxycarbonate High-Tc Superconductor (TI0.8Cr0.2)Sr4Cu2(CO3)O7 Probed by Soft X-ray Absorption Spectroscopy." To be published in Physica C (in press). Synchrotron Radiation Research Center (SRRC), Hsinchu, Taiwan, REPUBLIC OF CHINA.

Chen Qinghu, Fang Minghu, Jiao Zhengkuan, Zhang Qirui, Wen Haihu, and Zhao Zhongxian, "Influence of Nanometer-Sized MgO Particles on Flux Pinning in YBa2Cu3O7-d." To be published in Physica C (in press). Department of Physics, Zhejiang University, Hangzhou 310027, PEOPLE'S REPUBLIC OF CHINA. 74.60.Ge; 74.60.Jg; 74.76.Bz.

Noriko Chikumoto, Noriki Hayashi, Hiroki Kojo, Toshio Egi, Takato Machi, Naomi Koshizuka, and Masato Murakami, "High-Pressure Oxygenation Studies in Melt-Textured Sm123 and Nd123 Superconductors." Submitted to the Proc. of the 9th Int. Symp. on Supercond. (ISS'96), Sapporo, Hokkaido, Japan, Oct. 21-24, 1996. Superconductivity Research Laboratory, International Superconductivity Technology Center (ISTEC), 1-16-25 Shibaura, Minato-ku, Tokyo 105, JAPAN. Key words: Nd123, Sm123, high-pressure oxygenation, field-induced flux pinning, peak effect.

N. Chikumoto, M. Konczykowski, K. Kishio, and M. Murakami, "Comparative Study of the Flux Pinning by Columnar Defects in High-Tc Superconductors." 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. Superconductivity Research Laboratory, International Superconductivity Technology Center (ISTEC), 1-16-25 Shibaura, Minato-ku, Tokyo 105, JAPAN.

N. Chikumoto, S. Ozawa, S. I. Yoo, N. Hayashi, and M. Murakami, "Effects of Oxygen Content on the Superconducting Properties of Melt- Textured LRE123 Superconductors." To be published in Physica C. Superconductivity Research Laboratory, International Superconductivity Technology Center (ISTEC), 1-16-25 Shibaura, Minato-ku, Tokyo 105, JAPAN. Key words: LRE123, melt processing, oxygen deficiency, critical current density, peak effect, irreversibility field.

N. Chikumoto, S. Ozawa, S. I. Yoo, H. Kojo, N. Hayashi, and M. Murakami, "Pinning Properties of LRE123 (LRE=Nd,Sm) as a Function of Oxygen Deficiency." 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. Superconductivity Research Laboratory, International Superconductivity Technology Center (ISTEC), 1-16-25 Shibaura, Minato-ku, Tokyo 105, JAPAN.

N. Chikumoto, J. Yoshioka, M. Otsuka, S. I. Yoo, and M. Murakami, "Influence of Microstructure on the Pinning Properties of Nd123." 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. Superconductivity Research Laboratory, International Superconductivity Technology Center (ISTEC), 1-16-25 Shibaura, Minato-ku, Tokyo 105, JAPAN.

S. Chromik, V. Strbik, M. Jergel, F. Hanic, A. Conde-Gallardo, C. Falcony, E. Chavira, and S. Benacka, "Properties of Tl-Based Thin Films and Thin Film Microstrips Deposited by Evaporation of BaF2, CaF2 and Cu Components." 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. Institute of Electrical Engineering, Slovak Academy of Sciences, 842 39 Bratislava, SLOVAK REPUBLIC; e-mail elekchro@savba.sk.

J. W. Cochrane, P. A. Miles, G. J. Russell, G. Foran, and D. J. Cookson, "Electron Microprobe Analysis and Synchrotron Diffraction Study of Crystalline (Nd0.5Y0.5)Ba2Cu3O7-d." To be published in Physica C (in press). Advanced Electronic Materials Group, School of Physics, University of New South Wales, Sydney, N.S.W. 2052, AUSTRALIA.

L. Colonescu, J. Berthon, R. Suryanarayanan, and I. Zelenay, "Effect of Isovalent and Non-Isovalent Substitutions on Superconductivity in NdBa2-xPrxCu3O7." Contact R. Suryanarayanan, Laboratoire de Chimie des Solides, Universite Paris-Sud, UA446, CNRS, Bat. 414, F-91405 Orsay Cedex, FRANCE; e-mail suryan@isma.isma.u-psud.fr.

J. R. Cooper, J. W. Loram, J. D. Johnson, J. W. Hodby, and Chen Changkang, "3D XY Scaling of the Irreversibility Line of YBa2Cu3O7 Crystals." Submitted to Phys. Rev. Lett. Interdisciplinary Research Centre in Superconductivity, University of Cambridge, Madingley Road, Cambridge CB3 0HE, UNITED KINGDOM; telephone +44 1223 33 7445; telefax +44 1223 33 7074; e-mail jrc19@cam.ac.uk. 74.25.Bt; 74.60.Ge; 74.72.Bk; 64.60.Fr.

George W. Crabtree and David R. Nelson, "Vortex Physics in High- Temperature Superconductors." To be published in Physics Today (in press). Contact Janice Coble, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439; telefax (708) 252-9595; e-mail janice_coble@qmgate.anl.gov.

B. C. den Hertog and M. P. Das, "Local Moment Formation in Zinc Doped Cuprates." Department of Theoretical Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra ACT 0200, AUSTRALIA; e-mail bdh105@rsphy1.anu.edu.au; preprint also available at cond- mat@xxx.lanl.gov (#9702190).

P. Dore, P. Calvani, G. De Marzi, A. Paolone, S. Lupi, G. Balestrino, G. Petrocelli, and R. Desfeux, "Optical Conductivity of CuO2 Infinite-Layer Films." Submitted to Solid State Commun. Istituto Nazionale di Fisica della Materia and Dipartimento di Fisica, Universita di Roma "La Sapienza", Piazzale A. Moro 2, I-00185 Roma, ITALY; P. Calvani's e-mail calvani@axcasp.caspur.it. 71.38.+i; 72.10.Di; 78.20.Dj.

J. W. Ekin, Yizi Xu, S. Mao, T. Venkatesan, D. W. Face, M. Eddy, and S. A. Wolf, "Correlation Between d-Wave Pairing Behavior and Magnetic-Field-Dependent Zero-Bias Conductance Peak." Submitted to Phys. Rev. Lett. Electromagnetic Technology Division, National Institute of Standards and Technology, 325 Broadway, Mail Code 814.05, Boulder, CO 80303-3328; telephone (303) 497-5448; telefax (303) 497-5316; e-mail ekin@boulder.nist.gov.

G. Er, S. Kikkawa, M. Takahashi, and F. Kanamaru, "XANES Study on Electron Doped Infinite-Layer Sr1-xLaxCuO2 (0<=x<=0.12) and (Sr1- yCay)0.9La0.1CuO2 (0<=y<=0.20) Superconductors." To be published in Physica C (in press). Department of Chemistry and Materials Technology, Kyoto Institute of Technology, Matsugasaki, Sakyoku, Kyoto 606, JAPAN. Key words: infinite layer, electron doped, superconductor, XANES.

R. Gatt, E. Olsson, A. Morawski, T. Lada, A. Paszewin, I. Bryntse, A. M. Grishin, Yu. Eeltsev, P. Berastegui, and L.-G. Johansson, "Hg-1212 and Hg-1223 Single Crystals: Synthesis and Characterization." To be published in Physica C (in press). Department of Physics, Chalmers University of Technology, S-41296 Gothenburg, SWEDEN. Key words: Hg cuprates, single crystals, synthesis, high pressure, liquid phase epitaxy, scanning electron microscopy, transmission electron microscopy.

Anatoly Golub and Baruch Horovitz, "Glass Phases of Flux Lattices in Layered Superconductors." Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva 84105, ISRAEL; preprint also available at cond-mat@xxx.lanl.gov (#9703111). 74.60.Ge; 05.20.-y.

Z. H. Gong, A. Ronnekleiv, and J. K. Grepstad, "Performance of a Surface Acoustic Wave Filter with YBa2Cu3O7-d Superconducting Electrodes." 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. InterWAVE Communications, 656 Bair Island, Redwood City, CA 94063.

C. Goupil, A. Ruyter, V. Hardy, and Ch. Simon, "Flux Line Pinning and Transport Measurements in a Bi2212 Crystal in the Presence of Columnar Defects." To be published in Physica C. Laboratoire CRISMAT, ISMRA et Universite de Caen, UMR 6508 associee au CNRS, 6 Boulevard du Marechal Juin, F-14050 Caen Cedex, FRANCE; telephone +33 2 3145 2916; telefax +33 2 3195 1600; e-mail physol@crismat.ismra.fr. 74.60.Ge.

L. P. Guo, Z. F. Ren, J. Y. Lao, J. H. Wang, D. K. Christen, C. E. Klabunde, and J. D. Budai, "Epitaxial Superconducting Thin Films Tl0.78Bi0.22Sr1.6Ba0.4Ca2Cu3O9-d on (001) YSZ Synthesized by Laser Ablation and Post-Annealing in Pure Argon." To be published in Physica C (in press). Contact J. H. Wang, Superconductive Materials Laboratory, Department of Chemistry and New York State Institute on Superconductivity, State University of New York at Buffalo, Buffalo, NY 14260-3000; Z. F. Ren's e-mail zren@acsu.buffalo.edu.

P. Haibach, U. Frey, H. Adrian, F. Lankes, and K. F. Renk, Transversal Thermovoltages of (119) Bi2Sr2CaCu2O8+d Thin Films on Vicinal (110) SrTiO3 Substrates." 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. Institut fuer Physik, Johannes Gutenberg-Universitaet, D-55099 Mainz, GERMANY.

Tetsuo Hanaguri, Yoshishige Tsuchiya, Song Sakamoto, Atsutaka Maeda, and David G. Steel, "Effects of Columnar Defects on the Josephson Plasma Resonance in Bi2Sr2CaCu2Oy." To be published in Phys. Rev. Lett. Department of Basic Science, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153, JAPAN; telephone +81 3 5454 6763; telefax +81 3 3467 8945; e-mail ctetsuo@komaba.ecc.u-tokyo.ac.jp. 74.60.Ge; 72.30.+q; 74.72.Hs; 74.25.Nf.

Ling Hao, John C. Macfarlane, Colin M. Pegrum, Graeme J. Sloggett, and Catherine P. Foley, "Magnetic Field and Microwave Effects on Critical Current Fluctuations in HTS Grain-Boundary Josephson Junctions." Presented at the Appl. Supercond. Conf. (ASC'96), Pittsburgh, Pa., Aug. 25-30, 1996; to be published in IEEE Trans. Appl. Supercond. Contact John C. Macfarlane, Department of Physics and Applied Physics, John Anderson Bldg., University of Strathclyde, 107 Rottenrow, Glasgow G4 0NG, UNITED KINGDOM; telephone +44 141 552 4400; telefax +44 141 552 2891; e-mail j.c.macfarlane@strath.ac.uk.

Grzegorz Haran, Jason Taylor, and A.D.S. Nagi, "The Phase Transition Phenomena in Anisotropic Superconductors: Effect of the Orthorhombic Crystal Field and the Potential Impurity Scattering." To be published in Physica C (in press). Department of Physics, University of Waterloo, Waterloo, Ontario, CANADA N2L 3G1. Key words: d-wave superconductor, Fermi surface, pair breaking, specific heat at Tc, weak coupling.

G. Hechtfischer, R. Kleiner, K. Schlenga, W. Walkenhorst, P. Mueller, and H. L. Johnson, "Collective Motion of Josephson Vortices in Intrinsic Josephson Junctions in Bi2Sr2CaCu2O8+y." To be published in Phys. Rev. B. Physikalisches Institut III, Universitaet Erlangen- Nuernberg, Erwin-Rommel-Str. 1, D-91058 Erlangen, GERMANY; telephone +49 9131 85 7082; telefax +49 9131 15249; e-mail hechtfischer@physik.uni-erlangen.de. 74.80.Dm; 74.50.+r; 85.25.Cp.

G. Hechtfischer, W. Walkenhorst, G. Kunkel, K. Schlenga, R. Kleiner, P. Mueller, and H. L. Johnson, "High Frequency Applications of Intrinsic Josephson Junctions in Mesa Structures on Bi2Sr2CaCu2O8+y Single Crystals." To be published in IEEE Trans. Appl. Supercond. Physikalisches Institut III, Universitaet Erlangen-Nuernberg, Erwin- Rommel-Str. 1, D-91058 Erlangen, GERMANY; telephone +49 9131 85 7082; telefax +49 9131 15249; e-mail hechtfischer@physik.uni-erlangen.de.

Baruch Horovitz and Anatoly Golub, "Disorder in Two Dimensional Josephson Junctions." To be published in Phys. Rev. B. Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva 84105, ISRAEL; preprint also available at cond-mat@xxx.lanl.gov (#9701153). 74.50.+r; 75.50.Lk.

J. Horvat, R. Bhasale, Y. C. Guo, H. K. Liu, and S. X. Dou, "Improvement of Flux Pinning by Thermo-Mechanical Treatment of Bi- 2223/Ag Superconducting Tapes." To be published in Supercond. Sci. Technol. Centre for Superconducting and Electronic Materials, University of Wollongong, Northfields Avenue, Wollongong NSW 2522, AUSTRALIA; e-mail jhorvat@uow.edu.au.

A. M. Hu, Z. X. Zhao, W. Gawalek, M. Wu, T. Strasser, and P. Goernert, "Preparation and Characterization of Melt-Textured Nd1+xBa2-xCu3Oy Made in Air." 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. National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, PEOPLE'S REPUBLIC OF CHINA.

Ataru Ichinose and Akita Shirabe, "Film Growth and Roughness of YBCO Thin Films Shown by X-ray Reflection and RHEED." To be published in Physica C (in press). Central Research Institute of Electric Power Industry, Komae Research Laboratory, 2-11-1 Iwato Kita, Komae, Tokyo 201, JAPAN. Key words: thin film, x-ray reflectivity, RHEED.

Anna Jonsson and Petter Minnhagen, "Complex Impedance of a Two- Dimensional Josephson Junction Array." To be published in Physica C (in press). Department of Theoretical Physics, Umea University, 901 87 Umea, SWEDEN; telefax +46 90 169556; e-mail anna.jonsson@tp.umu.se. Key words: Josephson junction array, xy model, vortex, dynamical response, simulations. 74.40.+k; 74.60.Ge; 75.10.Hk; 75.40.Mg.

Don H. Kim, Patrick A. Lee, and Xiao-Gang Wen, "Massless Dirac Fermions, Gauge Fields, and Underdoped Cuprates." Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139- 4307; preprint also available at cond-mat@xxx.lanl.gov (#9702218). 74.20.Mn; 74.25.Bt; 74.25.Ha; 74.72.-h.

Yong-Jihn Kim and K. J. Chang, "Impurity Scattering in Superconductors." Presented at Symposium '97: Theoretical Solid State Physics, Taejon, Korea, Feb. 3-5, 1997; to be published in J. Korean Phys. Soc. Suppl. Department of Physics, Korea Advanced Institute of Science and Technology, Taejon 305-701, KOREA. 74.20.- z; 74.20.Mn; 74.40.+k.

H. Kitano, T. Hanaguri, and A. Maeda, "Out-of-Plane Microwave Conductivity of the Cuprates in the Superconducting State." 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. Department of Basic Science, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153, JAPAN; T. Hanaguri's telephone +81 3 5454 6763; telefax +81 3 3467 8945; e-mail ctetsuo@komaba.ecc.u-tokyo.ac.jp.

T. Kluge, G. Jakob, M. Speckmann, and H. Adrian, "Finite Range Scattering of Ni and Zn Impurities in Y-123 Thin Films." 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. Institut fuer Physik, Johannes Gutenberg-Universitaet, D-55099 Mainz, GERMANY.

D. Ko and H. Oesterreicher, "Observation of a New Cell Volume Expanded Superconducting State in YBa2(CuNi)3Oy Near y=6.5." To be published in Physica C (in press). Contact H. Oesterreicher, Materials Science and Department of Chemistry, University of California at San Diego, La Jolla, CA 92093-0317; telefax (619) 534- 7441. 74.62.Bf; 74.72.Bk.

S. Kolesnik, H. W. Weber, T. Skoskiewicz, M. Sawicki, and W. Sadowski, "Flux-Line Orientation in YBa2Cu3O7-d Crystals in Low Magnetic Fields." 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. Atominstitut der OEsterreichischen Universitaeten, Schuettelstrasse 115, A-1020 Wien, AUSTRIA; telephone +43 1 72701- 296; e-mail kolesnik@ati.ac.at.

P. Konsin, B. Sorkin, and M. Ausloos, "Electric Field Effects in High-Tc Superconductors." To be published in Fluctuation Phenomena in High Temp. Supercond., edited by M. Ausloos and A. Varlamov (Kluwer, Dordrecht, 1997). Institute of Physics, Riia 142, EE2400 Tartu, ESTONIA.

M. J. Kramer, K. W. Dennis, D. Falzgraf, R. W. McCallum, S. K. Malik, and W. B. Yelon, "Suppression of Superconductivity in the RE(Ba1- zREz)2Cu3O7+d (RE=Pr,Nd) System." Submitted to Phys. Rev. B. Ames Laboratory-USDOE, Iowa State University, Ames, IA 50011-3020; telephone (515) 294-0276; telefax (515) 294-4291; e-mail mjkramer@ameslab.gov. Key words: superconductivity, Nd-Pr-Ba-Cu-O neutron diffraction, Rietveld refinement. 74.25.-q; 74.62.-c; 74.62.Bf; 74.72.-h.

W. K. Kwok, G. W. Crabtree, J. A. Fendrich, and L. M. Paulius, "Dynamic Instabilities in the Vortex Lattice of YBa2Cu3O7-d." 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. Contact Janice Coble, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439; telefax (708) 252-9595; e-mail janice_coble@qmgate.anl.gov.

W. K. Kwok, L. M. Paulius, V. M. Vinokur, A. M. Petrean, R. M. Ronningen, and G. W. Crabtree, "Vortex Pinning of Anisotropic Splayed Defects in YBa2Cu3O7-d." Submitted to Phys. Rev. Lett. Contact Janice Coble, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439; telefax (708) 252-9595; e-mail janice_coble@qmgate.anl.gov.

Ji Ung Lee and James E. Nordman, "Effects of Damping on the Dynamics of Josephson Vortex in Bi2Sr2CaCu2Ox." To be published in Physica C (in press). Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439; telefax (708) 252-9595; e-mail jiung_lee@qmgate.anl.gov.

Patrick A. Lee and Xiao-Gang Wen, "The Unusual Superconducting State of Underdoped Cuprates." Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139-4307; Xiao-Gang Wen's e- mail wen@dao.mit.edu; preprint also available at cond- mat@xxx.lanl.gov (#9702119). 74.25.Jb; 79.60.-i; 71.27.+a.

LI Rukang, "Synthesis and Structure of Layered Cuprates Containing Pb2Cl as Separating Layer, Pb2Ba2Cu2MO8CI (M = Ta,Nb)." To be published in Physica C (in press). Department of Applied Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, PEOPLE'S REPUBLIC OF CHINA.

X. S. Ling, J. I. Budnick, and B. W. Veal, "Peak Effect and Its Disappearance in YBCO Superconducting Crystals." 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. Department of Physics, Brown University, Providence, RI 02912.

R. S. Liu, J. M. Chen, and D. S. Shy, "Enhancement of Zero Resistance Temperature Above 90 K and Hole Distribution in (Hg0.5Pb0.5)Sr2(Ca0.7Y0.3)Cu2O7-d via Chemical Substitution of Ba into Sr Sites." To be published in Inorganic Chem. Materials Chemistry Laboratory, Department of Chemistry, National Taiwan University, Roosevelt Road, Section 4, Taipei, Taiwan, REPUBLIC OF CHINA; telephone +886 2 369 0152 ext. 148; telefax +886 2 363 6359; e-mail rsliu@ccms.ntu.edu.tw.

V. M. Loktev, S. G. Sharapov, and V. M. Turkowski, "Phase Diagram in 2D Froehlich Model of Metal at Arbitrary Carriers Density: Pseudogap Versus Doping." Preprint #ITP-97-11E. Bogolyubov Institute for Theoretical Physics, Metrologichna str. 14-b, Kiev 252143, UKRAINE; e-mail vloktev@gluk.apc.org.

Jing Lu, Xiaobin Feng, and Liyuan Zhang, "Determination of the Mixing Potential V Between the Bipolaron and the Itinerant Electron and Possible Two Component Interaction Superconductivity Based on a Low N(EF) for Doped Fullerenes." To be published in Physica C. Contact Liyuan Zhang, Department of Physics, Peking University, Beijing 100871, PEOPLE'S REPUBLIC OF CHINA; telephone +86 10 6275 2369. Key words: Anderson lattice, bipolaronic superconductivity, electronic structure. 71.20.-b; 71.38.+i; 74.20.-z.

A. Maeda, Y. Tsuchiya, T. Hanaguri, S. Sakamoto, H. Ikeda, and R. Yoshizaki, "Phase Correlation Investigated by the Josephson Plasma Resonance in Bi2(Sr,La)2CuOy." 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. Department of Basic Science, The University of Tokyo, 3-8-1, Komaba, Meguro-ku, Tokyo 153, JAPAN; T. Hanaguri's telephone +81 3 5454 6763; telefax +81 3 3467 8945; e-mail ctetsuo@komaba.ecc.u-tokyo.ac.jp.

A. P. Malozemoff, Q. Li, and S. Fleshler, "Progress in BSCCO-2223 Tape Technology." 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. American Superconductor Corporation, Two Technology Drive, Westborough, MA 01581; telephone (508) 836-4200, ext. 234; telefax (508) 836-4248; e- mail amalozem@asc.mhs.compuserve.com.

A. P. Malozemoff, G. N. Riley, Jr., S. Fleshler, and Q. Li, "Supercurrent Conduction Mechanisms in BSCCO-2223 Tapes." Presented at the Int. Workshop on Critical Currents in Supercond. for Practical Appl. (SPA '97), Xi'an, China, March 6-8, 1997. American Superconductor Corporation, Two Technology Drive, Westborough, MA 01581; telephone (508) 836-4200, ext. 234; telefax (508) 836-4248; e- mail amalozem@asc.mhs.compuserve.com.

F. Mancini, D. Villani, and H. Matsumoto, "Electronic Specific Heat in the Normal State of Cuprate High Tc Superconductors." Dipartimento di Fisica Teorica e S.M.S.A., Unita INFM di Salerno, Universita di Salerno, I-84081 Baronissi (SA), ITALY; e-mail mancini@vaxsa.csied.unisa.it. 74.72.-h; 75.40.-s; 71.10.Fd.

F. Mancini, D. Villani, and H. Matsumoto, "Incommensurate Magnetism in Cuprate Materials." Dipartimento di Fisica Teorica e S.M.S.A., Unita INFM di Salerno, Universita di Salerno, I-84081 Baronissi (SA), ITALY; e-mail mancini@vaxsa.csied.unisa.it. 74.72.-h; 75.10.-b; 71.10.Fd.

M. Brian Maple, Marcio C. de Andrade, Jan Herrmann, Robert P. Dickey, Neil R. Dilley, and Seungho Han, "Superconductivity in Rare Earth and Actinide Compounds." To be published in J. Alloys and Compounds (in press). Department of Physics 0319, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0319; telefax (619) 534- 1241; e-mail mbmaple@ucsd.edu.

Maxim Victorovich Marchesvsky, "Magnetic Decoration Study of the Vortex Lattice in Superconductors: Ordering, Elasticity, Dimensionality, and Dynamics." Submitted as a Ph.D. thesis (Leiden University). Kamerlingh Onnes Laboratory, Leiden University, Nieuwsteeg 18, 2300 RA Leiden, THE NETHERLANDS.

T. Matsushita, M. Kiuchi, H. Yamato, T. Hirano, and N. Koshizuka, "Longitudinal Elastic Correlation Length of Flux Lines Along the c- Axis in Superconducting Bi-2212 Single Crystal in the Field Range Near the Peak Effect." To be published in Physica C (in press). Department of Computer Science and Electronics, Kyushu Institute of Technology, 680-4 Kawazu, Iizuka 820, JAPAN.

N. N. Merchant, V. A. Maroni, A. K. Fischer, S. E. Dorris, W. Zhong, and N. Ashcom, "Effect of Lead Content on Phase Evolution and Microstructural Development in Ag-Clad Bi-2223 Composite Conductors." To be published in the Proc. of the Spring TMS Meeting in Orlando, Fla., Feb. 9-13, 1997. Chemical Technology Division, Basic Energy Science, Bldg. 205, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439-4837; telephone (630) 252-3165; telefax (630) 252-9373; e-mail merchant@anlcmt.cmt.anl.gov.

G. Moiseev, J. Sestak, N. Ilynych, S. Zaitzeva, and N. Vatolin, "Standard Enthalpies of Formation for Some Phases in the YBaCuO System." To be published in Thermochimica Acta. Contact J. Sestak, Division of Solid State Physics, Institute of Physics, Academy of Sciences of the Czech Republic, 10 Cukrovarnicka Str., 16200 Praha 6, CZECH REPUBLIC; telefax +42 2 312 3184; e-mail sestak@fzu.cz.

A. Morales, A. Conde-Gallardo, M. Jergel, C. Falcony, S. Jimenez- Sandoval, E. Chavira, and J. G. Cabanas Moreno, "Influence of Thallination Conditions Upon Properties of TBCCO Films Deposited from an Aerosol." 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. Departamento de Fisica, Centro de Investigacion y de Estudios Avanzados del I.P.N., Apdo. Postal 14-740, C.P. 07300 Mexico D.F., MEXICO; telephone +52 5 747-7000 or -7001; telefax +52 5 747 7002; e- mail alemor@fis.cinvestav.mx.

Michio Naito, Hisashi Sato, and Hideki Yamamoto, "MBE Growth of (La,Sr)2CuO4 and (Nd,Ce)2CuO4 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. Matsuda Research Group, Materials Research Laboratory, NTT Basic Research Laboratories, 3-1 Wakamiya, Morinosato, Atsugi-shi, Kanagawa 243-01, JAPAN; telephone +81 462 40 3516; telefax +81 462 70 2364; e-mail michio@will.brl.ntt.co.jp. Key words: LSCO, NCCO, thin film, reactive coevaporation, tunneling.

M. Naito, H. Yamamoto, and H. Sato, "Surface and Interface Study on MBE-Grown Nd1.85Ce0.15CuO4 Thin Films by Photoemission Spectroscopy and Tunneling Spectroscopy." 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. Matsuda Research Group, Materials Research Laboratory, NTT Basic Research Laboratories, 3-1 Wakamiya, Morinosato, Atsugi-shi, Kanagawa 243-01, JAPAN; telephone +81 462 40 3516; telefax +81 462 70 2364; e-mail michio@will.brl.ntt.co.jp.

J. E. Ostenson, S. Bud'ko, M. Breitwisch, D. K. Finnemore, N. Ichikawa, and S. Uchida, "Flux Expulsion and Reversible Magnetization in the Stripe Phase Superconductor, La1.45Nd0.40Sr0.15CuO4." Submitted to Phys. Rev. B. Ames Laboratory-USDOE and Department of Physics, Iowa State University, Ames, IA 50011-3160; telephone (515) 294-3312; telefax (515) 294-0689; e-mail ostenson@ameslab.gov. 74.70.Ad.

G. K. Padam, S. N. Ekbote, D. K. Suri, Balvinder Gogia, K. B. Ravat, and B. K. Das, "A Comparative Study of Rapid and Slow Furnace Cooling Effects on the Superconducting Properties of Pb-free and Pb-doped Bi- 2212 HTSC." To be published in Physica C (in press). National Physical Laboratory, New Delhi 110 012, INDIA.

N. G. Patil, S. S. Banerjee, Subir Saha, K. Ghosh, S. Ramakrishnan, S. Bhattacharya, A. K. Grover, T. V. Chandrasekhar Rao, G. Ravikumar, P. K. Mishra, V. C. Sahni, E. Yamamoto, Y. Haga, M. Hedo, Y. Inada, and Y. Onuki, "ac and dc Magnetization Studies of Peak Effect in a Clean Crystal of CeRu2." 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. Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, INDIA; e-mail sb@tifrvax.tifr.res.in; A. K. Grover's telephone +91 22 215-2971 or -2979; telefax +91 22 215-2110 or -2181; e-mail grover@tifrvax.tifr.res.in. Key words: peak effect, vortex melting, magnetic phase diagram, CeRu2.

David Pines, "Understanding High Temperature Superconductors: Progress and Prospects." 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. Department of Physics, Loomis Laboratory of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, IL 61801-3080; telephone (217) 333-0115; telefax (217) 244-7559; e-mail d-pines@uiuc.edu.

M. P. Risse, M. G. Aikele, S. G. Doettinger, R. P. Huebener, C. C. Tsuei, and M. Naito, "Dissipation in the Superconducting Mixed State in the Presence of a Small Oscillatory Magnetic Field Component." To be published in Phys. Rev. B. Physikalisches Institut, Lehrstuhl Experimentalphysik II, University of Tuebingen, Morgenstelle 14, D- 72076 Tuebingen, GERMANY. 74.60.Ge; 74.60.Jg; 74.25.Fy; 74.72.Jt.

C. Rossel, M. Willemin, J. Hofer, H. Keller, Z. F. Ren, and J. H. Wang, "Pairing Symmetry in Single-Layer Tetragonal Tl2Ba2CuO6+d from In-Plane Torque Anisotropy." Preprint #6373; 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. IBM Research Division, Zurich Research Laboratory, CH-8803 Rueschlikon, SWITZERLAND.

Seungoh Ryu and D. Stroud, "Magnetization Jump in a Model for Flux Lattice Melting at Low Magnetic Fields." Department of Physics, Ohio State University, Columbus, OH 43210; e-mail ryu@pacific.mps.ohio- state.edu.

T. Sakai, H. Utsunomiya, Y. Saito, T. Hanamachi, and M. Shinkawa, "Effect of Intermediate Rolling Condition on the Critical Current Density of Silver-Sheathed Bi(2223) Superconducting Tapes." To be published in Physica C (in press). Department of Materials Science and Engineering, Faculty of Engineering, Osaka University, 2-1 Yamadaoka, Suita Osaka 565, JAPAN; telephone +81 6 879 7501; telefax +81 6 879 7936; e-mail sakai@mat.eng.osaka-u.ac.jp. Key words: intermediate rolling, Bi(2223) tape, critical current density, roll gap geometry, texture.

K. Salama, S. Sathyamurthy, and A. S. Parikh, "A Novel Method for Processing High Tc Superconducting Current Leads." Preprint #97:033; 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. 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.

F. Sandiumenge, N. Vilalta, Y. Maniette, and X. Obradors, "Stability and Evolution of Stacking Faults in Melt Textured YBa2Cu3O7-x." Institut de Ciencia de Materials de Barcelona, Consell Superior d'Investigacions Cientifiques, Campus de la Universitat Autonoma de Barcelona, 08193 Bellaterra, Catalunya, SPAIN.

J. Sestak, D. Sedmidubsky, and G. Moiseev, "Some Thermodynamic Aspects of High Tc Superconductors." To be published in J. Thermal Analysis. Division of Solid State Physics, Institute of Physics, Academy of Sciences of the Czech Republic, 10 Cukrovarnicka Str., 16200 Praha 6, CZECH REPUBLIC; telefax +42 2 312 3184; e-mail sestak@fzu.cz. Key words: thermodynamics, enthalpy, phase diagrams, data simulation, oxide superconductors, nonstoichiometry, Y-Ba-Cu-O and Bi-Sr-Cu-O systems.

E. Silva, R. Fastampa, M. Giura, R. Marcon, C. Possanzini, S. Sarti, and E. L. Wolf, "Microwave Surface Resistance in BSCCO Crystal: Magnetic Field and Angular Measurement." 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. Dipartimento di Fisica "E. Amaldi", Universita di Roma Tre, Via della Vasca Navale 84, I-00146 Rome, ITALY; telephone +39 6 499 13434; telefax +39 6 557 9303; e-mail silva@amaldi.fis.uniroma3.it.

E. Silva, R. Fastampa, M. Giura, R. Marcon, and S. Sarti, "I-V Measurements in Bi2212 Film in Magnetic Fields: Scaling Behavior." 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. Dipartimento di Fisica "E. Amaldi", Universita di Roma Tre, Via della Vasca Navale 84, I-00146 Rome, ITALY; telephone +39 6 499 13434; telefax +39 6 557 9303; e-mail silva@amaldi.fis.uniroma3.it.

E. Silva, M. Lanucara, and R. Marcon, "Microwave Surface Resistance Peaks in BSCCO Thin Films." 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. Dipartimento di Fisica "E. Amaldi", Universita di Roma Tre, Via della Vasca Navale 84, I-00146 Rome, ITALY; telephone +39 6 499 13434; telefax +39 6 557 9303; e-mail silva@amaldi.fis.uniroma3.it.

J.M.S. Skakle, E. E. Lachowski, R. I. Smith, and A. R. West, "High Pressure Oxidation of the Tetragonal La1.5-xBa1.5+x-yCayCu3Oz Superconductors." To be published in Phys. Rev. B. Department of Chemistry, University of Aberdeen, Meston Walk, Aberdeen AB24 3UE, Scotland, UNITED KINGDOM; telephone +44 1224-272918 or -272943; telefax +44 1224-272938; e-mail a.r.west@abdn.ac.uk.

Myoung Youp Song, "Superconducting Characteristics of Oxides Produced from Melt Spun Y(Yb)-Ba-Cu/Ag Precursor Alloy Ribbons." To be published in Physica C (in press). Department of Materials Engineering, Chonbuk National University, 664-14, 1ga Deogzindong Chonju, Chonbuk 560-756, SOUTH KOREA; telefax +82 652 70 2386. Key words: melt spun Y(Yb)-BaCu/Ag ribbons, oxidation, press deformation, optimum compositions.

J. E. Sonier, R. F. Kiefl, J. H. Brewer, J. Chakhalian, S. R. Dunsiger, W. A. MacFarlane, R. I. Miller, A. Wong, G. M. Luke, and J. W. Brill, "Muon-Spin Rotation Measurements of the Magnetic Field Dependence of the Vortex-Core Radius and London Penetration Depth in NbSe2." Submitted to Phys. Rev. Lett. TRIUMF, Canadian Institute for Advanced Research and Department of Physics and Astronomy, University of British Columbia, Vancouver, B.C., CANADA V6T 1Z1, telefax (604) 822-5324; e-mail sonier@triumf.ca. 74.20.-z; 74.60.-w; 74.70.Ad; 76.75.+i.

R. Surdeanu, R. J. Wijngaarden, R. Griessen, C. Rossel, Z. F. Ren, and J. H. Wang, "Crossover from Fractal to Non-Fractal Flux Penetration in Vicinal Tl2Ba2CuO6+d Thin Films." Preprint #6432; 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. Institute COMPAS and Faculty of Physics and Astronomy, Vrije Universiteit Amsterdam, De Boelelaan 1081, 1081 HV Amsterdam, THE NETHERLANDS.

T. Tsuboi, T. Hanaguri, and A. Maeda, "The Static and Dynamic Properties of the Vortices in Bi2Sr2CaCu2Oy ." 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. Department of Basic Science, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153, JAPAN; T. Hanaguri's telephone +81 3 5454 6763; telefax +81 3 3467 8945; e-mail ctetsuo@komaba.ecc.u-tokyo.ac.jp.

Y. Tsuchiya, T. Hanaguri, A. Maeda, and D. G. Steel, "Josephson Plasma Resonance in the Mixed State of Heavy-Ion Irradiated Bi2Sr2CaCu2Oy." 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. Department of Basic Science, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153, JAPAN; T. Hanaguri's telephone +81 3 5454 6763; telefax +81 3 3467 8945; e-mail ctetsuo@komaba.ecc.u-tokyo.ac.jp.

A. V. Velichko, N. T. Cherpak, E. V. Izhyk, A. Ya. Kirichenko, and I. N. Chukanova, "High-Frequency Response to Millimeter Wave Irradiation of YBaCuO Thin Films and Ceramic." To be published in Physica C (in press). Institute of Radiophysics and Electronics, National Academy of Sciences, 310085 Kharkov, UKRAINE. Key words: high-temperature superconductors, microwave surface resistance, radiowave response, nonlinear behavior.

G. Villard, V. Hardy, A. Maignan, D. Pelloquin, and B. Raveau, "Superconducting Properties of Mercury Cuprates Single Crystals." 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. Laboratoire CRISMAT, CNRS, URA 1318, ISMRA/Universite de Caen, Boulevard du Marechal Juin, F-14050 Caen Cedex, FRANCE.

P. G. Wahlbeck and Dwight L. Myers, "Thermodynamics of the TI-O System and TI-Superconductors." To be published in J. Chem. Phys. Department of Chemistry and National Institute for Aviation Research, Wichita State University, Wichita, KS 67260-0051; telephone (316) 978-3120; telefax (316) 978-3431; e-mail pgwahlbe@twsuvm.uc.twsu.edu.

F. Warmont, V. Hardy, A. Ruyter, Ch. Goupil, G. Villard, J. Provost, and Ch. Simon, "Angle-Resolved Resistivity Measurements in a Bi-2212 Single Crystal with Inclined Columnar Defects." 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. Laboratoire CRISMAT, CNRS, URA 1318, ISMRA/Universite de Caen, Boulevard du Marechal Juin, F- 14050 Caen Cedex, FRANCE.

P. Wochner, X. Z. Xiong, and S. C. Moss, "Stripe Correlation of Tilts and Superconductivity in La2CuO4+d." Preprint #97:027; submitted to the Proc. of the Int. Conf. on Stripes, Lattice Instabilities, and High Tc Supercond., Rome, Italy, Dec. 8-12, 1996. Department of Physics, Brookhaven National Laboratory, Upton, NY 11973; 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

Chien-Jang Wu, M.-H. Tsai, and H. D. Yang, "The Effect of Coherence Factor on Slow Wave Propagation in Superconducting Planar Transmission Lines." To be published in Physica C (in press). Department of Physics, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan, REPUBLIC OF CHINA. Key words: coherence effect, thin films, London penetration depth. 74.76.Db; 74.20.De; 85.25.Am.

Y. Y. Xue, Z. L. Du, Y. Cao, N. L. Wu, Y. Y. Sun, I. A. Rusakova, D. K. Ross, L. Gao, and C. W. Chu, "Phase Competition, Structures and Superconductivity in Ba-Ca-Cu-(C)-O Samples Synthesized at 5 GPa." Preprint #97:031; submitted to the Proc. of the Int. Workshop of Crystal Chemistry of High-Tc Supercond. (CC-HTSC'97), Hefei, People's Republic of China, March 6-8, 1997. 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.

Y. Y. Xue, Y. Y. Sun, I. A. Rusakova, D. K. Ross, Z. L. Du, N. L. Wu, Y. Cao, L. Gao, B. R. Hickey, and C. W. Chu, "Phase Identification of the New 126 K Ba-Ca-Cu-O Superconductor." Preprint #97:032; submitted to Physica C. Texas Center for Superconductivity, University of Houston, Houston, TX 77204-5932; telephone (713) 743- 8200; telefax (713) 743-8201; e-mail preprints@www.tcs.uh.edu. Key words: Ba2Ca2Cu3(CaxCuy)O8+d, structure, structural phase transition. 74.72.Jt; 74.62.Bf; 61.66.Fn.

Haitao Yang, Hongjie Tao, Yingzi Zhang, Duogui Yang, Lin Li, and Zhongxian Zhao, "AFM Study of Growth of Bi2Sr2-xLaxCuO6 Thin Films." Submitted to 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. National Laboratory for Superconductivity, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, PEOPLE'S REPUBIC OF CHINA.

Z. J. Yang and J. R. Hull, "Energy Loss in Superconducting Bearing Systems." Presented at the Appl. Supercond. Conf. (ASC'96), Pittsburgh, Pa., Aug. 25-30, 1996; to be published in IEEE Trans. Appl. Supercond. Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439; telefax (708) 252-9595; e-mail janice_coble@qmgate.anl.gov.

Liyuan Zhang and Xiaobing Feng, "The Essential Characteristics of the Pseudogapped Metallic State of High-Tc Superconductor." To be published in Mod. Phys. Lett. B. Department of Physics, Peking University, Beijing 100871, PEOPLE'S REPUBLIC OF CHINA; telephone +86 10 6275 2369. 74.20.-z.

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

*Sept. 1 - 12, 1997: NATO Advanced Study Institute on the Gap Symmetry and Fluctuations in High-Tc Superconductors, Institut d'Etudes Scientifiques de Cargese, Corse, France. Objective is to give advanced lectures on the most recent progress in understanding of the physics of high-temperature superconductors with a special emphasis on the symmetry of the superconducting gap and critical fluctuations. Pedagogical explanation of various theoretical models and a direct comparison with recent (often controversial) experiments is the central point of this Advanced Study Institute. Application deadline, April 15, 1997. For information, contact Davor Pavuna, Institute Micro & Opto-electronique, Department de Physique - Ecole Polytechnique Federale, CH-1015 Lausanne, Switzerland; telephone +41 21-6933301; telefax +41 21-6934666; e-mail pavuna@eldp.epfl.ch; Web site http://dpwww.epfl.ch/conferences/cargese97.html.

*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. 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.

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

Proceedings: Physics, Materials and Applications: Proceedings of the 10th Anniversary HTS Workshop, Houston, Texas, March 12-16, 1996; edited by B. Batlogg, C. W. Chu, W. K. Chu, D. U. Gubser, and K. A. Mueller. Commemorates the 10th anniversary of the discovery of high- temperature superconductors (HTS) and contains works of about 200 members of the international HTS community including universities, government centers and laboratories, major industries, and small businesses. Focuses on early and major new findings in the physics, mechanisms, materials, and applications of HTS, with a projection to the emerging and future areas in science and technology. Publ. 1996; 736 pp.; price $86; ISBN 981-02-2715-9. For information, contact World Scientific Publishing Co. Inc., 1060 Main St., River Edge, NJ 07661; telephone (800) 227-7562 or (201) 487-9655; telefax (201) 487- 9656. In Europe, World Scientific Publishing Co. Ltd., 57 Shelton Street, Covent Garden, London WC2 9HE, United Kingdom; telephone +44 171 836 0888; telefax +44 171 836 2020. In Asia, World Scientific Publishing Co. Pte. Ltd., Farrer Road, P.O. Box 128, Singapore 9128; telephone +65 38 25663; telefax +65 38 25919. Information also available at the Web sites http://www.wspc.com.sg or http://www.wspc.co.uk.

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, #8, April 15, 1997.