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.

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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:

Li2BeH4

At the end of last year, there was press coverage in France concerning the possibility of superconductivity at room temperature in the compound Li2BeH4 (see our Jan. 1, 1997, issue). Readers may be interested to know that a scientific report of this work has been published by S. Contreras (Bruyeres-le-Chatel) et al. in C. R. Acad. Sci. Paris 324, 641 (1997). The authors investigated the magnetic properties of Li2BeH4 as a function of temperature in magnetic fields up to 1 T. Field-cooled and zero-field-cooled measurements showed irreversibilities that were interpreted in terms of an irreversibility field of about 10 kG at 100 K, decreasing monotonically to zero at about 350 K. The virgin magnetization curve of Li2BeH4 at room temperature (300 K) resembled that of a type-II superconductor, showing diamagnetic behavior with an initial Meissner region and a sharp cusp suggesting an H_[c1] of about 100 G, but becoming paramagnetic at fields above about 1.3 kG.

Despite suggestions by A. W. Overhauser (Purdue) that high-temperature superconductivity might be found in this compound [Phys. Rev. B 35, 411 (1987); Int. J. Mod. Phys. B 1, 927 (1987)], the authors caution that the data do not allow them to conclude that Li2BeH4 is a superconductor. For example, they were unable to carry out transport measurements on the powdered samples. They stress, however, that the magnetic properties are so uncommon that further investigations of the physical properties of Li2BeH4 are warranted. Such studies will be technically difficult because of the toxicity of beryllium and the extreme reactivity of the hydride.

Vortices

Hall-sensor-array measurements of the ac current response in Bi2Sr2CaCu2O8+d (Bi-2212) crystals have enabled D. T. Fuchs (Weizmann Institute) et al. to determine the distribution of current across the sample width in the dissipative vortex-liquid phase, where a linear resistance is observed. Over a wide range of temperatures and fields, the authors found that the current does not flow uniformly, as in a normal metal, but instead flows mostly at the edges of the sample because of strong surface barriers. The authors stress that this finding has major implications for the interpretation of the existing resistive data and may be of importance for the development of high- temperature superconducting wires and tapes.

High-accuracy specific-heat measurements by M. Roulin et al. (Geneve) on a 0.3 g YBa2Cu3O7-d crystal have revealed specific-heat steps on a line B_m(T) that is well separated from the upper critical-field crossover B_[c2](T). The authors identify this as the second-order transition that is predicted to occur when a vortex glass melts. The anisotropy of the melting field B_m(T) is the same as that of B_[c2](T), but B_m is nearly inversely proportional to the anisotropy ratio gamma = (m_c/m_[ab])^[1/2] > 1, such that the lines B_m(T) and B_[c2](T) move in opposite directions when the anisotropy increases.

A preprint by K. Yamafuji and T. Kiss (Kyushu) considers details of how flux pinning and thermal activation affect the dependence of the electric field E upon the current density J. The authors find that the resulting scaling characteristics of E(J) are the same as those predicted by Fisher and co-workers for the vortex-glass transition. The authors also discuss the reasons why observed E vs. J characteristics are scalable over wider ranges of temperature and flux density than the critical regime.

The effects of thermal fluctuations on the mean-field Abrikosov phase have been theoretically investigated by S.-K. Chin and M. A. Moore (Manchester). The authors assert that there is only one true thermodynamic phase in the vortex system, the vortex-liquid phase, in which the phase correlation length l_[parallel] along the magnetic-field direction grows exponentially rapidly as the temperature is lowered. For a finite bulk system, the authors find that there is a 3D-2D crossover effect when l_[parallel] becomes comparable with the sample thickness and that this mimics the first-order transition reported in clean YBa2Cu3O7-d (YBCO) and Bi2Sr2CaCu2O8+d (Bi-2212) crystals. The authors calculate the jumps in entropy, magnetization, and specific heat due to this crossover and find reasonably good agreement with experiments on both YBCO and Bi-2212.

The vortex phase diagram in Bi-2212 has been investigated by M. F. Goffman (Bariloche) et al. by studying the linear ac transverse permeability (h_[ac] perp. to H || c axis) over a wide range of temperature and magnetic fields. At low fields (H < 300 Oe), the vortex solid state is characterized by a c-axis vortex correlation length l_c limited by the sample thickness. At low temperatures (T < 20 K), point disorder is sufficiently strong, and the phase-coherent ordered vortex solid becomes metastable. In the temperature range 20 K < T < 42 K, when the applied field exceeds H_[ent](T), the ordered vortex state transforms into an entangled state with no indication of reduction of l_c. At a higher crossover field, the linear response becomes ohmic and l_c is less than the sample thickness. At higher temperatures, the vortex structure becomes an uncorrelated vortex liquid in all directions.

Transport critical current densities in single crystals of the anisotropic high-Tc superconductor Bi-2212 have been measured by V. F. Solovyov (Kiev) et al. over a wide range of temperatures, applied fields, and field angles above and below the decoupling line. In the low-field region, the authors found three-dimensional scaling behavior similar to that of YBa2Cu3O7-d single crystals, while at high fields, the behavior appears to be that of decoupled 2D pancake vortices.

A density-functional approach has been used by A. Kraemer (Stanford) and J. E. Diaz-Herrera (Mexico City) to calculate the inhomogeneous vortex- density distribution in the vortex-liquid phase at the planar surface of a layered superconductor, where the external magnetic field is perpendicular to the superconducting layers and parallel to the surface. Near the freezing transition strong vortex-density fluctuations are found to persist far into the bulk liquid. The authors also calculate the height of the Bean-Livingston surface barrier.

The first penetration of vortices into current-carrying cylindrical type-II superconductors subjected to an external magnetic field of arbitrary orientation has been theoretically calculated by Yu. A. Genenko (Goettingen and Donetsk) et al. The results also should be valid for arbitrary sample radii relative to the penetration depth lambda.

Using advanced magneto-optical techniques, V. K. Vlasko-Vlasov (Argonne and ISSP-Chernogolovka) et al. have investigated magnetic flux distributions on the faces of YBCO crystal plates remagnetized by unidirectional and rotating fields. The authors find that the bending of vortex lines is crucial for the remagnetization process in in-plane fields even in plates with large width-to-thickness ratios. Closed vortex loops smaller than a critical radius collapse, forming a flux- free cylinder, the Meissner hole.

The phenomenological double critical-state model, which uses critical values for the components of the current density both perpendicular and parallel to the local magnetic induction B, has been applied by A. Silva-Castillo et al. (Puebla) to tubes of granular high-Tc superconductors in axial and azimuthal magnetic fields. The theory accounts for both inter- and intragranular currents.

A preprint by C. Boekema (San Jose State) et al. reports transverse- field muon-spin-relaxation (muSR) data in RBa2Cu3O7-d (R = Er, Gd, Ho, Eu, Y). The main vortex signal for R = Er, Gd, and Ho reveals signs of two peaks in the field distribution below the applied field (B_[ext] = 1 kG), as predicted for d-wave superconductivity. For all the above rare earths R, low-field tails in the field distributions were found well below B_[ext], which the authors suggest may be due to magnetic frustration in the vortex state or possible CuO-chain superconductivity below 25 K.

RBa2Cu3O7-d

When NdBa2Cu3O7-d (Nd-123) is melt-textured under low oxygen pressure P(O2) and subsequently annealed in oxygen to produce the superconducting phase, there is considerable enhancement of flux pinning compared with Y-123. H. Wu (Ames Lab, Iowa State) et al. find that this enhancement is accompanied by a precipitation mechanism due to a change in the solubility limits of Nd1+xBa2-xCu3O7-d between the high-temperature, low-P(O2) conditions and the low-temperature oxygen annealing. Transmission electron microscopy (TEM) reveals a coherent intermediate precipitate structure with a composition of BaCuO2 and a high density of dislocations. The authors believe these defects are responsible for the strong flux pinning in this material. A related preprint by the same authors reports a study of the lower solubility limits of Nd1+xBa2- xCu3O7-d in 1 bar, 0.2 bar, 0.01 bar, and 0.001 bar oxygen pressure using differential thermal analysis (DTA) and x-ray diffraction (XRD).

The fabrication of Nd-Ba-Cu-O bulk superconductors with high Tc and sharp superconducting transitions using the melt process in air with additional high-temperature annealing in a reduced oxygen atmosphere is reported by H. Kojo et al. (SRL-ISTEC). The authors report that the key to this achievement is the use of Ba-rich Nd4-2zBa2+2zCu2-zO10-d as a precursor. Fabricated bulk samples exhibit onset Tc values of 94-95 K and a secondary peak effect in the M-H loop. At 77.3 K, the peak position and the irreversibility field for the best sample were about 1.2 T and 5 T, respectively, and the estimated Jc at the peak field was about 2.3 x 10^4 A/cm^2.

A TEM study of melt-textured Nd-123 crystals is reported by A. M. Hu et al. (Beijing). The authors studied structural defects in the Nd-123 matrix, Nd-123/Nd-422 interfaces, and crystal boundaries. The pinning effect of Nd-422 is attributed to the pinning by low-angle Nd-422/Nd-123 interfaces with alleviated stress and a high density of edge dislocations in Nd-123 near the interfaces.

The effects of Ce-based additions (CeO2 and BaCeO3) in combination with MgO additions on the magnetic properties of melt-textured YBa2Cu3O7-d have been studied by P. J. McGinn (Notre Dame) et al. The additions lead to improvements in the magnetic properties of YBa2Cu3O7-d compared with samples with either addition alone or with no additions. The Ce-Mg addition combination produces a peak effect in the magnetic hysteresis loop without significant Tc degradation. The authors postulate that this is due to the formation of a new type of pinning center.

As reported by C.-J. Kim et al. (KAERI), the particle-segregation modes of two different inclusion phases, Y2BaCuO5 (Y-211, a dissolving phase in Ba-Cu-O liquid) and BaCeO3 (a nondissolving phase), have been studied in melt-textured Y-123 with BaCeO3 addition (0-20 wt%) and with 30 wt% Y-211 plus BaCeO3 (0-20 wt%). The authors report details of how the segregation modes depend on both the type and amount of the inclusion phases.

Bi Cuprates

As reported by S. Hebert et al. (Caen), different configurations of columnar defects tilted with respect to c have been tailored in Bi-2212 single crystals by controlling the orientation of a heavy-ion beam: one single direction of tracks yielding parallel defects (n = 1), two coplanar directions of tracks (n = 2), and three directions of tracks symmetrically distributed around the c axis (n = 3). The authors report evidence for a low-temperature regime where the pinning efficiency is nearly independent of n and a high-temperature regime where it increases with n.

Related preprints by H. K. Liu et al. (Wollongong) and by Y. C. Guo et al. (Wollongong) report that under certain conditions small amounts of residual Bi-2201 reside along Bi-2223 colony boundaries and block current flow between colonies, thus limiting the flow of supercurrent in Bi-2223/Ag tapes. Elimination of Bi-2201 using a two-step sintering process in the final thermal cycle, or cooling the tapes slowly, increased the critical current by a factor of two.

Other Cuprates

As emphasized in a preprint by J. M. Tranquada (Brookhaven), neutron- scattering experiments have played a crucial role in characterizing the spin and charge correlations in copper-oxide superconductors. While the data are often interpreted with respect to specific theories of the cuprates, the author attempts to distinguish those facts that can be extracted empirically and the connections that can be made with minimal assumptions.

Thin Films

As reported by S. P. Pai (TIFR) et al., Ba2LaNbO6, a new perovskite ceramic substrate material for YBa2Cu3O7-d, has been grown epitaxially on (100) LaAlO3 from a sintered Ba2LaNbO6 pellet by pulsed laser ablation. A superconducting YBa2Cu3O7-d/Ag film grown in-situ on the epitaxial Ba2LaNbO6 gave Tc(0) = 90 K, a sharp transition of DeltaT = 0.4 K, and a 77 K critical current density of 6 x 10^6 A/cm^2.

The effect of laser power on the transient response of the photoimpedance and the in-situ sample temperature has been studied by Y. G. Zhao et al. (Maryland) in epitaxial YBCO films at a wavelength of 810 nm using 100 fs laser pulses. The authors explain the results using the kinetic-inductance model and the bolometric mechanism accounting for the effects of laser heating.

Applications

As reported by T. W. Clinton and M. Johnson (NRL), a superconducting switch (magnetoquenched superconducting valve) has been developed in a simple bilayer cross-strip geometry using the magnetic fringe field of a ferromagnetic film to control the critical current in an underlying superconducting bridge. The magnetization of the ferromagnet is rotated in the plane of the film to vary the magnitude of the fringe field locally applied to the superconductor from negligible to substantial values. In the latter case, the magnetization is oriented such that the magnetic poles are along the edges of the cross strip directly above the superconductor. The large fringe field near the poles suppresses superconductivity over a length of order microns, giving rise to superconducting weak-link behavior. A large (order-of-magnitude) modulation of the critical current is observed. The effect has been demonstrated in the low-Tc superconductors Pb (Tc = 7.3 K) and Sn (Tc = 3.9 K). Fabrication of the device involves minimal processing. The authors note that applications as a high-speed switch (GHz-THz), amplifier, nonvolatile storage cell, and controllable weak link are possible.

Theory

A preprint by M. I. Salkola and J. R. Schrieffer (Florida State) analyzes collective, low-energy excitations in quasi-two-dimensional d- wave superconductors. While the long-range Coulomb interaction shifts the charge-density-wave and phase modes up to the plasma energy, the spin-density-wave excitation that arises from a strong local electron- electron repulsion can propagate as a damped collective mode within the superconducting energy gap. The authors suggest that these excitations are relevant to high-Tc superconductors close to the antiferromagnetic phase boundary and may explain some of the exotic features of the experimentally observed spectral-density and neutron-scattering data.

A phase diagram for the pseudogap onset temperature T* (associated with the breakdown of the Fermi-liquid state due to strong pairing correlations) and the superconducting instability Tc has been derived by J. Maly et al. (Chicago) as a function of pairing strength. The authors' diagrammatic approach to the BCS - Bose-Einstein crossover problem self-consistently treats the coupling between the single- particle and pair propagators, and leads to a continuous evolution of these propagators into the standard T < Tc counterparts. A rich structure is found in Tc which reflects the way the superconducting instability at Tc is affected by the pseudogap Delta_[pg]. An important consequence of Cooper-pair-induced pseudogaps is that the magnitude of Tc is sustained even when Delta_[pg] > Tc.

A preprint by C. Grimaldi (Roma) et al. shows that the inclusion of effects beyond Migdal's limit in the electron-phonon interaction naturally leads to an isotope effect for the effective mass m* of the charge carriers before reaching the polaron limit. The authors propose an experimental test of the theory via specific-heat measurements in the normal state.

As theoretically shown by G. A. Ummarino and R. S. Gonnelli (Torino), a large violation of Migdal's theorem (as in Bi-2212) yields a large increase of the electron-phonon coupling constant lambda and to large, but different, increases in the critical temperature Tc and the superconducting gap parameter Delta.

Voltage-biased superconducting planar d-wave junctions have been studied theoretically by T. Loefwander (Goeteborg) et al. for arbitrary transmission and arbitrary orientation of the order parameters of the superconductors. For a certain orientation of the superconductors, the odd ac components disappear, resulting in a doubling of the Josephson frequency. The authors study the sensitivity of this disappearance to orientation and compare with experiments on grain-boundary junctions.

The intrinsic gap suppression at the superconductor-insulator interface due to the short coherence length in high-Tc superconductors has been theoretically studied by G. A. Ummarino (Torino) et al. in the framework of a mixed (s+id)-wave pair symmetry for the order parameter ranging from pure s- to pure d-wave. The authors tentatively obtain an upper limit for the amount of d-wave present in the gap of YBCO.

The properties of a Josephson junction including a ferromagnetic insulating layer have been studied theoretically by M. Yamashiro (Niigata) et al. The calculated current shows an anomalous dependence on the magnitude of the exchange interaction at the interface. As the magnitude of the exchange interaction increases, the Josephson junction changes from a 0-junction to a pi-junction.

Other Activities

A detailed neutron-scattering study of the ordering of spins and holes in oxygen-doped La2NiO4+d (d = 0.133) is reported by P. Wochner (Brookhaven) et al. The single-crystal sample exhibits the same oxygen- interstitial order but better-defined charge-stripe order than that found previously in crystals with d = 0.125.

Layered cobalt oxysulfides, A2Cu2CoO2S2 (A = Sr, Ba) have been synthesized and characterized by W. J. Zhu (TCSUH) et al. These compounds crystallize in a structure containing CoO2 layers that resemble the CuO2 layers in the high-Tc cuprates. These compounds, however, are semiconducting and exhibit successive low-dimensional antiferromagnetic transitions. A preprint by B. Lorenz et al. (TCSUH) describes properties of a closely related compound.

A new technique for measuring Tc(P) in the diamond anvil cell by the third harmonic of the ac susceptibility is described in a preprint by M. P. Raphael (Catholic University) et al. It requires no background subtraction and allows the use of gasket materials made from hardened steels.

A paper by D. M. Eagles (Mexico) presents a high-drift-velocity model to explain observations of room-temperature superconductivity in narrow channels of oxidized polypropylene.

Overviews

The theory of the effect of density-of-states (DOS) fluctuations on the normal-state properties of high-temperature superconductors has been reviewed by A. A. Varlamov (Pisa-Florence and Moscow) et al. The authors first note that preformed Cooper pairs arise automatically from ab-initio calculations: thermal fluctuations lead to the appearance of a nonzero density of fluctuating Cooper pairs with finite lifetime within the layers without the establishment of long-range order in the system. Such pair formation accordingly leads to a renormalization of the density of one-electron states at the Fermi level and accounts for pseudogap features, the steep increase in the electrical resistivity along the c-axis just above Tc, anomalous magnetoresistance, magnetic- field effects on the resistive transition along the c axis, the c-axis far-infrared absorption spectrum, and NMR characteristics around the critical temperature (205 refs.).

Various theoretical aspects of the isotope effect on the transition temperature Tc and the penetration depth lambda in superconductors are reviewed by A. Bill (Lawrence Berkeley Laboratory) et al. The focus is on the influence of factors not related to the pairing mechanism, including the effect of magnetic impurities, the proximity effect, and nonadiabaticity. The theory is applied to both conventional and high- temperature superconductors (74 refs.).

Angle-resolved photoemission spectroscopy (ARPES) results on the high- temperature superconductors are discussed in an overview by M. R. Norman (Argonne) et al. They note that these results have revealed (a) a d- wave superconducting gap, (b) a collective mode in the superconducting state, and (c) pairing correlations in the pseudogap phase. In each case, conventional physics leads to an incomplete picture, and new physics remains to be developed to obtain a proper understanding of these new materials (33 refs.)

Microgravimetric investigations of the high-temperature superconductors are the subject of a brief review by G. W. Chadzynski (Wroclaw) (30 refs.).

Ph.D. Thesis

The fabrication of planar junctions made of a-axis films using Josephson coupling parallel to the CuO2 layers in YBCO/PBCO/YBCO stacks is reported in the Twente Ph.D. thesis of R. G. Wichern (Hannover). The author found that the pinholes and short circuits appearing in all previous efforts can be avoided through the use of selective epitaxial growth (SEG) etching by a focused ion beam (FIB). The resulting planar junctions exhibited RSJ-like behavior, Fraunhofer patterns, and Shapiro steps with properties comparable to those of other junction types with artificial barriers. The barrier coherence length was estimated to be 3.4 nm (162 refs.).

Contributed by John R. Clem

Contents: Preprints begin on page 5; Coming Events begin on page 12; and FYI is on page 13.

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.

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.

N. Adamopoulos and S. K. Patapis, "Accurate Determination of the Critical State in Anisotropic Superconductors from Transport Measurements." Submitted to Phys. Rev. B. Contact S. K. Patapis, Section of Solid State Physics, Department of Physics, University of Athens, Panepistimiopolis GR 157 84, Athens, GREECE.

M. G. Aikele, R. P. Huebener, D. Weischer, and C. C. Tsuei, "Effect of High-Frequency Magnetic Fields on the Dissipative Vortex Motion in the Superconducting Mixed State." To be published in Physica C (in press). Contact R. P. Huebener, Physikalisches Institut, Lehrstuhl Experimentalphysik II, University of Tuebingen, Morgenstelle 14, D-72076 Tuebingen, GERMANY; telephone +49 7071 29 76315; telefax +49 7071 29 6322; e-mail prof.huebener@uni-tuebingen.de. 74.60.Ge; 74.60.Jg; 74.25.Fy.

A. A. Aligia, S. Koval, and R. Migoni, "On the Stability of 2*sqrt(2) x 2*sqrt(2) Oxygen Ordered Superstructures in YBa2Cu3O6+x." Preprint #IC/97/86; to be published in Phys. Rev. B. Centro Atomico Bariloche and Instituto Balseiro, Comision Nacional de Energia Atomica, 8400 Bariloche, ARGENTINA.

A. Bill, V. Z. Kresin, and S. A. Wolf, "The Isotope Effect in Superconductors." To be published in Pair Correlation in Many-Fermions Systems (Plenum Press, 1998). Lawrence Berkeley Laboratory, 1 Cyclotron Road, MS 62-203, Berkeley, CA 94720; telephone (510) 486-6991; telefax (510) 486-5401; e-mail abill@lbl.gov.

C. Boekema, E. J. Ruiz, Z. C. Pobre, S. R. Punjabi, and O. Vera, "Plausible d-Wave Cuprate Superconductivity: Muon-Spin-Relaxation Studies of RBCO Vortex States." Submitted to the 7th Joint MMM-Intermag Conf., San Francisco, Calif., Jan. 6-9, 1998. Department of Physics, San Jose State University, San Jose, CA 95192-0106; telephone (408) 924- 5260; e-mail boekemac@aol.com.

G. Boettger, P. Allenspach, J. Mesot, A. Doenni, Y. Aoki, and H. Sato, "Magnetic Properties of the High-Temperature Superconductor R2Ba4Cu7O15- d (R=Er,Dy)." Presented at ICFE3, Paris, France, Sept. 14-18, 1997; to be published in J. Alloys and Compounds. Contact P. Allenspach, Laboratory for Neutron Scattering, ETH Zurich and PSI Villigen, CH-5232 Villigen PSI, SWITZERLAND; telephone +41 56 310 2527; telefax +41 56 310 2939; e-mail peter.allenspach@psi.ch. Key words: magnetic order, superexchange, dipolar interaction, short-range interaction, electronic clusters, disorder.

G. M. Bruun, V. Nikos Nicopoulos, and N. F. Johnson, "Acoustic Attenuation in a Type-II Superconductor at High Magnetic Fields." To be published in Phys. Rev. B. Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, ENGLAND; e-mail g.bruun1@physics.oxford.ac.uk; preprint also available at cond- mat@xxx.lanl.gov (#9710241). 74.25.Ld; 74.60.-w.

G. W. Chadzynski, "Microgravimetric Investigations of High Temperature Superconductors." Submitted to J. Thermal Anal.: Proc. of the 27th Int. Vacuum Microbalance Techniques Conf. (IUPAC), Lublin, Poland, July 16-18, 1997. W. Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 937, 50-950 Wroclaw 2, POLAND. Key words: high-Tc superconductors, microgravimetric investigations of oxide superconductors in vacuum and controlled environments.

G. W. Chadzynski, J. Stepien-Damm, and Z. Damm, "The Thermal Decomposition of (RE)Ba2Cu3O6 Compounds." Submitted to J. Thermal Anal.: Proc. of the 27th Int. Vacuum Microbalance Techniques Conf. (IUPAC), Lublin, Poland, July 16-18, 1997. W. Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 937, 50-950 Wroclaw 2, POLAND. Key words: activation energy, kinetics, solid-state reactions, thermogravimetry.

S.-K. Chin and M. A. Moore, "Finite Size Effects as the Explanation of 'Freezing' in Vortex Liquids." Theory Group, Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UNITED KINGDOM; e-mail chin@a13.ph.man.ac.uk; preprint also available at cond- mat@xxx.lanl.gov (#9709347). 74.20.De; 74.76.-w.

Mahn-Soo Choi, Sung-Ik Lee, and M. Y. Choi, "Dissipative Dynamics of Quantum Vortices in Superconducting Arrays." To be published in Phys. Rev. B. Department of Physics, Pohang University of Science and Technology, Pohang 790-784, KOREA; e-mail mschoi@postech.ac.kr; preprint also available at cond-mat@xxx.lanl.gov (#9710293). 74.50.+r; 74.60.Ge; 74.80.-g.

Iksu Chong, Takahito Terashima, Yoshichika Bando, Mikio Takano, Yuji Matsuda, Tatsuji Nagaoka, and Ken-ichi Kumagai, "Growth of Heavily Pb- Substituted Bi-2201 Single Crystals by a Floating Zone Method." To be published in Physica C (in press). Institute for Chemical Research, Kyoto University, Uji, Kyoto-fu 611, JAPAN; telephone +81 774 383121; telefax +81 774 383118; e-mail chongis@scl.kyoto-u.ac.jp. Key words: electrical resistivity, modulated structures, normal-state properties, single crystal, growth, substitution effects.

Durga P. Choudhury, H. Srikanth, S. Sridhar, and P. C. Canfield, "Magneto-Electrodynamics at High Frequencies in the Antiferromagnetic and Superconducting States of DyNi2B2C." Submitted to Phys. Rev. B. 112 Dana Research Center, Department of Physics, Northeastern University, Boston, MA 02115; preprint also available at Web site http://sagar.physics.neu.edu/preprints.html. 74.25.Ha; 74.25.Nf; 74.72.Ny; 75.20.Hr; 75.40.Gb; 75.50.Ee; 75.90.+w.

T. W. Clinton and Mark Johnson, "Magnetoquenched Superconducting Valve." Submitted to J. Appl. Phys.: Proc. of the 7th Joint MMM-Intermag Conf., San Francisco, Calif., Jan. 6-9, 1998. Code 6341, Materials Physics Branch, Naval Research Laboratory, 4555 Overlook Ave. S.W., Washington, DC 20375-5320; e-mail clinton@anvil.nrl.navy.mil.

R. Cloots, Fr. Auguste, A. Rulmont, N. Vandewalle, and M. Ausloos, "Directional Solidification by Appropriate Chemically Active Single Crystal Seed: An Alternative Way of Generating Large Superconducting 123 Single Domain." To be published in J. Mater. Res. (Dec. 1997). SUPRAS, Chemistry Institute B6, University of Liege, Sart-Tilman, B-4000 Liege, BELGIUM; e-mail cloots@gw.unipc.ulg.ac.be; N. Vandewalle's telephone +32 4366 3703; telefax +32 4366 2990.

R. Combescot, "The Gap Maximum of Anisotropic Superconductors." Laboratoire de Physique Statistique de l'Ecole Normale Superieure, associe au CNRS et aux Universites Paris 6 et Paris 7, 24 rue Lhomond, F-75005 Paris, FRANCE; e-mail roland.combescot@lps.ens.fr; preprint also available at cond-mat@xxx.lanl.gov (#9710115). 74.20.Fg; 74.25.Jb; 74.72.Bk.

F. M. Costa, R. F. Silva, and J. M. Vieira, "Influence of Epitaxial Growth on Superconducting Properties of LFZ Bi-Sr-Ca-Cu-O Fibers: Part I. Crystal Nucleation and Growth." To be published in Physica C (in press). Departamento de Fisica, Universidade de Aveiro, 3810 Aveiro, PORTUGAL; telephone +351 34 370954; telefax +351 34 24965; e-mail flor@fis.ua.pt. Key words: nucleation, epitaxial, superconductors, fibers. 74.72.Hs; 81.10.Aj.

F. M. Costa, R. F. Silva, and J. M. Vieira, "Influence of Epitaxial Growth on Superconducting Properties of LFZ Bi-Sr-Ca-Cu-O Fibers: Part II. Magnetic Susceptibility and Transport Properties." To be published in Physica C (in press). Departamento de Fisica, Universidade de Aveiro, 3810 Aveiro, PORTUGAL; telephone +351 34 370954; telefax +351 34 24965; e-mail flor@fis.ua.pt. Key words: nucleation, annealing, superconductors, fibers. 74.72.Hs; 74.25.Fy; 74.25.Ha.

D. M. Eagles, "Consequences for Magnetic Properties of a Model to Explain Room-Temperature Superconductivity in Narrow Channels in Oxidized Polypropylene." To be published in J. Supercond. Instituto de Investigaciones en Materiales, Universidad Nacional Autonoma de Mexico, Apartado Postal 70-360, 04510 Mexico D.F., MEXICO; telefax +52 5 616 1251; e-mail eagles@servidor.unam.mx. Key words: room-temperature superconductivity, high-current superconductivity, oxidized polypropylene, diamagnetism, metamagnetism. 74.20.Mn; 74.25.Ha; 74.70.Kn; 74.72.-h.

G. Er, S. Kikkawa, M. Takahashi, F. Kanamaru, M. Hangyo, K. Kisoda, and S. Nakashima, "Studies on Low Temperature Structure of Infinite-Layered Superconductor Sr1-xLaxCuO2 (0<=x<=0.12)." To be published in Physica C (in press). Department of Chemistry and Materials Technology, Kyoto Institute of Technology, Matsugasaki, Sakyoku, Kyoto 606, JAPAN; telephone +81 75 724 7576; telefax +81 75 724 7580; e-mail egang@ipc.kit.ac.jp. Key words: low temperature, infinite layer, superconductor, XAFS, Raman spectroscopy, oxygen ion displacement.

J. D. Fan, G. L. Zhao, T. Edis, and Y. M. Malozovsky, "A Molecular Dynamics Simulation Study of the Two-Dimensional Lattice Structure of the Cu-1 Plane in YBa2Cu3O6+x." To be published in Phys. Rev. B. Department of Physics, Southern University, Baton Rouge, LA 70813. 61.20.Ja; 74.72.Bk.

M. Franz and Z. Tesanovic, "Self-Consistent Electronic Structure of a d_[x^2-y^2] and a d_[x^2-y^2]+id_[xy] Vortex." Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218; e-mail franz@pha.jhu.edu; preprint also available at cond-mat@xxx.lanl.gov (#9710258).

Dan T. Fuchs, Eli Zeldov, Michael Rappaport, Tsuyoshi Tamegai, Shuuichi Ooi, and Hadas Shtrikman, "Where Does the Transport Current Flow in Bi2Sr2CaCu2O8 Crystals?" To be published in Nature. Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, ISRAEL; telephone +972 8 934 3667; telefax +972 8 934 4106; e-mail fndandan@wis.weizmann.ac.il.

S. Garcia, J. E. Musa, B. Giordanengo, and E. M. Baggio-Saitovitch, "Two Regimes Behavior in the Resistivity of the La1.85Sr0.15Cu1-xLixO4 System: A Signature of Different Electronic States for Holes." To be published in Solid State Commun. Laboratorio de Superconductividad, Facultad de Fisica-IMRE, Universidad de la Habana, San Larazo y L, 10400, Ciudad Habana, CUBA; e-mail sgg@ffuh.fmq.uh.edu.cu. Key words: superconductors, electronic transport.

U. Gasser, P. Allenspach, and A. Furrer, "Neutron Spectroscopy Data of DyNi2^[11]B2C and Yb0.1Lu0.9Ni2^[11]B2C." To be published in Physica B: Proc. of the Int. Conf. on Neutron Scattering (ICNS'97), Toronto, Canada, Aug. 17-21, 1997. Contact P. Allenspach, Laboratory for Neutron Scattering, ETH Zurich and PSI Villigen, CH-5232 Villigen PSI, SWITZERLAND; telephone +41 56 310 2527; telefax +41 56 310 2939; e-mail peter.allenspach@psi.ch. Key words: quaternary borocarbides, crystal field, magnetic properties.

U. Gasser, P. Allenspach, A. M. Mulders, P.C.M. Gubbens, and A. Furrer, "Two Types of Magnetism in the Magnetic Superconductor TmNi2B2C." Presented at ICFE3, Paris, France, Sept. 14-18, 1997; to be published in J. Alloys and Compounds. Laboratory for Neutron Scattering, ETH Zurich and PSI Villigen, CH-5232 Villigen PSI, SWITZERLAND; P. Allenspach's telephone +41 56 310 2527; telefax +41 56 310 2939; e-mail peter.allenspach@psi.ch. Key words: quaternary borocarbides, crystal field, neutron scattering, superconductors.

Yu. A. Genenko, A. V. Snezhko, P. Troche, J. Hoffmann, and H. C. Freyhardt, "Magnetic Self-Field Entry into a Current-Carrying Type-II Superconductor: III. General Criterion of Penetration for an External Field of Arbitrary Direction." To be published in Phys. Rev. B. Metal Physics Institute, University of Goettingen, Hospitalstr. 3-7, D-37073 Goettingen, GERMANY. 74.25.Ha; 74.60.Ec; 74.60.Jg; 74.76.-w.

M. F. Goffman, J. A. Herbsommer, F. de la Cruz, T. W. Li, and P. H. Kes, "Vortex Phase Diagram of Bi2Sr2CaCu2O8+d: c Axis Superconducting Correlation in the Different Vortex Phases." To be published in Phys. Rev. B. Centro Atomico Bariloche, Comision Nacional de Energia Atomica, 8400 S. C. de Bariloche, ARGENTINA; e-mail goffman@cab.cnea.edu.ar.

G. S. Grader, P. Yossefov, G. M. Reisner, and G. E. Shter, "Synthesis of Nd123 Superconducting Powder via Oxalate Coprecipitation." To be published in Physica C (in press). Chemical Engineering Department and Crown Center for Superconductivity, Technion, Haifa 32000, ISRAEL; telephone +972 48292 008; telefax +972 48230 476.

C. Grimaldi, E. Cappelluti, and L. Pietronero, "Isotope Effect on m* in High-Tc Materials Due to the Breakdown of Migdal's Theorem." Dipartimento di Fisica, Universita di Roma "La Sapienza," Piazzale A. Moro 2, I-00185 Rome, ITALY; e-mail claudio@pil.phys.uniroma1.it; preprint also available at cond-mat@xxx.lanl.gov (#9710159). 71.18.+y; 71.38.+i; 74.25.Kc.

Y. C. Guo, J. Horvat, H. K. Liu, and S. X. Dou, "Current Limiting Effect of Residual Bi2Sr2CuO6 in Silver-Sheathed (Bi,Pb)2Sr2Ca2Cu3O10 Superconductors." To be published in Physica C. Center for Superconducting and Electronic Materials, University of Wollongong, NSW 2522, AUSTRALIA; S. X. Dou's telephone +61 2 4221 5730; telefax +61 2 4221 5731; e-mail shi_dou@uow.edu.au; Web site http://www.uow.edu.au.

M. Gutmann, P. Allenspach, and A. Furrer, "Cluster Formation and Percolative Behavior in Nd2-x-yCexLayCuO4 (0<=x<=0.2, y=0.5, 1)." To be published in Physica B: Proc. of the Int. Conf. on Neutron Scattering (ICNS'97), Toronto, Canada, Aug. 17-21, 1997. Laboratory for Neutron Scattering, ETH Zurich and PSI Villigen, CH-5232 Villigen PSI, SWITZERLAND; telephone +41 56 310 20 92; telefax +41 56 310 29 39; e- mail gutmann@psi.ch. Key words: crystal-field spectroscopy, phase separation, superconductivity.

S. M. Hayden, G. Aeppli, P. Dai, H. A. Mook, T. G. Perring, S.-W. Cheong, Z. Fisk, F. Dogan, and T. E. Mason, "Absolute Measurements of the High-Frequency Magnetic Dynamics in High-Tc Superconductors." To be published in Physica B: Proc. of the Int. Conf. on Neutron Scattering (ICNS'97), Toronto, Canada, Aug. 17-21, 1997. H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, UNITED KINGDOM; e- mail s.hayden@bris.ac.uk; preprint also available at cond- mat@xxx.lanl.gov (#9710181).

H. Hebert, V. Hardy, G. Villard, M. Hervieu, Ch. Simon, and J. Provost, "Vortex Pinning by Different Angular Distributions of Columnar Defects in Bi2Sr2CaCu2O8." To be published in Phys. Rev. B. Laboratoire CRISMAT, CNRS, URA 1318, ISMRA/Universite de Caen, Boulevard du Marechal Juin, F-14050 Caen Cedex, FRANCE. 61.80.Jh; 74.60.Ge; 74.60.Jg; 74.72.Hs.

J. M. Heintz and A. Dardant, "Oxi-Nitrate Synthesis of Non-Carbonated YBa2Cu3O7-d Powders." To be published in Physica C (in press). Institut de Chimie de la Matiere Condensee de Bordeaux, CNRS, Universite Bordeaux I, Chateau Brivazac, Avenue du Dr. Schweitzer, F-33608 Pessac Cedex, FRANCE; telephone +33 556 84 6257; telefax +33 556 84 8321; e- mail heintz@icmcb.u-bordeaux.fr.

A. M. Hu, W. Liu, J. W. Xiong, Y. L. Qin, C. Pang, and Z. X. Zhao, "TEM Observations of Melt-Textured Nd123 Superconductors." To be published in Physica C. Institut de Ciencia de Materials de Barcelona, Campus de la Universitat Autonoma de Barcelona, E-08193 Bellaterra, Barcelona, SPAIN; telefax +34 3 5805729; e-mail anming@icmvax.icmab.es. Key words: melt-textured materials, Nd123, microstructure.

H. Iwasaki, S. Inaba, K. Sugioka, Y. Nozaki, and N. Kobayashi, "Superconducting Anisotropy in the Y-Based System Substituted for the Y, Ba, and Cu Sites." To be published in Physica C (in press). School of Material Science, Japan Advanced Institute of Science and Technology, Hokuriku (JAIST), Asahidai 1-1, Tatsunokuchi-machi, Nomi-gun 923-12, Ishikawa, JAPAN; telephone +81 761 511512; telefax +81 761 511149; e- mail hideo@jaist.ac.jp. Key words: superconducting anisotropy, coherence length, Y-based system.

Chan-Joong Kim, Ki-Baik Kim, Il-Hyun Kuk, and Gye-Won Hong, "Trapping Mode of Y2BaCuO5 and BaCeO3 Inclusions Within the Melt-Textured YBa2Cu3O7-y Crystals." To be published in J. Mater. Res. Superconductivity Research Laboratory, Korea Atomic Energy Research Institute, P.O. Box 105, Yusung, Taejon 305-600, SOUTH KOREA; telephone +82 42 868 8908; telefax +82 42 862-5496; e-mail cjkim2@nanum.kaeri.re.kr.

H. Kojo, S. I. Yoo, and M. Murakami, "Melt Processing of High-Tc Nd-Ba- Cu-O Superconductors in Air." To be published in Physica C (in press). Contact M. Murakami, Superconductivity Research Laboratory, International Superconductivity Technology Center (ISTEC), 1-16-25 Shibaura, Minato-ku, Tokyo 105, JAPAN; telephone +81 3 3454 9284; telefax +81 3 3454 9287; e-mail murakami@istec.or.jp. Key words: superconductor, melt process, Nd-Ba-Cu-O, critical current density, solid solution, phase diagram.

Andreas Kraemer and J. Enrique Diaz-Herrera, "The Structure of the Vortex Liquid at the Surface of a Layered Superconductor." Department of Applied Physics, Stanford University, Stanford, CA 94305; e-mail kraemer@drizzle.stanford.edu; preprint also available at cond- mat@xxx.lanl.gov (#9710017). 74.60.Ge.

X. Z. Liao, X. L. Wang, H. K. Liu, and S. X. Dou, "TEM Study of the Microstructures of Spiral Grown Bi2Sr2CaCu2Oy Crystal." To be published in Physica C. Australian Key Centre for Microscopy and Microanalysis, University of Sydney, NSW 2006, AUSTRALIA; e-mail xzliao@emu.usyd.edu.au. Key words: Bi2Sr2CaCu2Oy, spiral growth, microstructures, transmission electron microscopy.

H. K. Liu, R. Bhasale, Y. C. Guo, J. Horvat, B. Zeimetz, and S. X. Dou, "Effect of Final Annealing Temperature on Critical Current Density of Ag/Bi-(Pb)-Sr-Ca-Cu-O Tapes." To be published in Appl. Supercond. Center for Superconducting and Electronic Materials, University of Wollongong, NSW 2522, AUSTRALIA; S. X. Dou's telephone +61 2 4221 5730; telefax +61 2 4221 5731; e-mail shi_dou@uow.edu.au; Web site http://www.uow.edu.au.

Tomas Loefwander, Goeran Johansson, Magnus Hurd, and Goeran Wendin, "Superconducting d-Wave Junctions: The Disappearance of the Odd ac Components." Division of Microelectronics and Nanoscience, Department of Physics, Chalmers University of Technology and Goeteborg University, S-41296 Goeteborg, SWEDEN; e-mail tfstomas@fy.chalmers.se; preprint also available at cond-mat@xxx.lanl.gov (#9710004). 74.50.+r; 74.20.-z.

B. Lorenz, W. J. Zhu, S. T. Ting, and P. H. Hor, "High Pressure Investigation of the Layered Compound Sr2Cu2CoO2(S1-xSex)2." Preprint #97:127; submitted to Proc. of Joint AIRAPT-16 & HPCJ-38 Int. Conf. on High Pressure Sci. and Technol., Kyoto, Japan, Aug. 25-29, 1997; to be published in Rev. Sci. Technol. 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.

Jiri Maly, Boldizsar Janko, and K. Levin, "Superconductivity from a Pseudogapped Normal State: A Mode Coupling Approach to Precursor Superconductivity." Presented at the Conf. on Spectroscopies in Novel Supercond. (SNS '97), Cape Cod, Mass., Sept. 14-18, 1997. James Franck Institute, University of Chicago, 5640 S. Ellis Avenue, Chicago, IL 60637; Boldizsar Janko's e-mail janko@jellybean.uchicago.edu; preprint also available at cond-mat@xxx.lanl.gov (#9710187). 74.20.Mn; 74.25.-q; 74.25.Fy; 74.25.Nf; 74.72.-h.

H. Matsuhata, D. H. Ha, K. Oka, F. Iga, and Y. Nishihara, "Microstructural Study of the Ni-Doped 2212-Phase of Bi-Sr-Ca-Cu-O Superconductor Single Crystals." To be published in Physica C (in press). Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki 305, JAPAN; telephone +81 298 585532; telefax +81 298 585523; e-mail e8917@etl.go.jp. Key words: Bi-Sr-Ca-Cu-Ni-O, 2212-phase, traveling solvent floating zone (TSFZ) method, single crystal, HREM.

M. Matsukawa, K. Iwasaki, K. Noto, N. Kobayashi, and Y. Shiohara, "In- Plane Thermal Conductivity of a Large Single Crystal of YBa2Cu3O7-x in the Mixed State." To be published in J. Magn. & Magn. Mater. Faculty of Engineering, Department of Materials Science and Technology, Iwate University, 4-3-5 Ueda, Morioka 020, JAPAN; telephone +81 19 621 6358; telefax +81 19 621 6373; e-mail matsukawa@msv.cc.iwate-u.ac.jp. Key words: magnetic vortices, superconductors-high Tc, thermal conductivity.

T. Matsushita, M. Kiuchi, and K. Noguchi, "Correlation Length of Flux Lines in the Vicinity of the Vortex Glass-Liquid Transition in High- Temperature Superconductors." To be published in Physica C (in press). Department of Computer Science and Electronics, Kyushu Institute of Technology, 680-4 Kawazu, Iizuka 820, JAPAN; telefax +81 948 29 7683; e- mail matusita@cse.kyutech.ac.jp.

P. J. McGinn, S. Yeung, A. Banerjee, and J. Fultz, "Improved Flux Pinning Through Ce-Mg Additions in Melt Textured YBa2Cu3O7-d." To be published in Appl. Phys. Lett. Department of Chemical Engineering, University of Notre Dame, 182 Fitzpatrick Hall, Notre Dame, IN 46556- 5637; telephone (219) 631-5580; telefax (219) 631-8366; e-mail mcginn.1@nd.edu.

A. R. Moodenbaugh, L. H. Lewis, and S. Soman, "Superconductivity of Polycrystalline La2-x-yNdySrxCuO4." To be published in Physica C (in press). Materials Science Division, Department of Applied Science, Brookhaven National Laboratory, Upton, NY 11973; telephone (516) 344- 4870; telefax (516) 344-4071. Key words: substitution effects, magnetization.

Takayuki Nishio and Hiromichi Ebisawa, "Hall Resistivity of Type-II Superconductors in the Renormalized Regime." To be published in Physica C (in press). Contact Hiromichi Ebisawa, Department of Computer and Mathematical Science, Graduate School of Information Sciences, Tohoku University, Aoba-ku, Sendai 980, JAPAN; telephone +81 22 217 5846; telefax +81 22 217 5851; e-mail puppy@cmt.is.tohoku.ac.jp or ebi@cmt.is.tohoku.ac.jp. Key words: Hall resistivity, TDGL, fluctuation, renormalized regime.

M. R. Norman, H. Ding, M. Randeria, and J. C. Campuzano, "Electron Self- Energy of High Temperature Superconductors as Revealed by Angle Resolved Photoemission." To be published in J. Phys. Chem. Solids: Proc. of the Conf. on Spectroscopies in Novel Supercond. (SNS'97), Cape Cod, Mass., Sept. 14-18, 1997. Material Science Division 223, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439; telephone (630) 252-3518; telefax (630) 252-7777; e-mail norman@thio.msd.anl.gov; preprint also available at cond-mat@xxx.lanl.gov (#9710185).

Denjoe O'Connor and C. R. Stephens, "Universal Scaling Properties of Superconductors in Magnetic Fields." Preprint #CINVESTAV-FIS/97-13. Departamento de Fisica, Cinvestav, Apartado Postal 14-740, 07000 Mexico D.F., MEXICO; e-mail denjoe@sirius.fis.cinvestav.mx; preprint also available at cond-mat@xxx.lanl.gov (#9710068). 74.25.Bt; 05.70.Jk; 64.60.Ak.

C. J. Olson, C. Reichhardt, J. Groth, Stuart B. Field, and Franco Nori, "Plastic Flow, Voltage Noise and Vortex Avalanches in Superconductors." To be published in Physica C (in press). Contact Franco Nori, Department of Physics, University of Michigan, Ann Arbor, MI 48109-1120; telephone (313) 764-3271; telefax (313) 764-6843. 64.60.Ht; 74.60.Ge.

Peter Olsson and S. Teitel, "Critical Behavior of the Meissner Transition in the Lattice London Superconductor." Department of Theoretical Physics, Umea University, 901 87 Umea, SWEDEN; S. Teitel's e-mail stte@pas.rochester.edu; preprint also available at cond- mat@xxx.lanl.gov (#9710200). 74.40.+k; 64.60.Fr.

S. Ono, T. Mori, S. Endo, N. Toyota, T. Sasaki, Y. Watanabe, and T. Fukase, "Temperature Dependence of the Electronic Structure Temperature Dependence of the Electronic Structure of alpha-(BEDT-TTF)2MHg(SCN)4 (M=NH4, K, Rb)." To be published in Physica C (in press). Contact T. Mori, Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Tokyo 152, JAPAN; telephone +81 3 5734 2427; telefax +81 3 5734 2876; e-mail takehiko@o.cc.titech.ac.jp. Key words: organic superconductor, electronic structure, band structure, Fermi surface.

S. P. Pai, J. Jasudasan, P. R. Apte, R. Pinto, J. Kurian, P. K. Sajith, J. James, and J. Koshy, "Epitaxial YBa2Cu3O7-d-Ag Thin Films (Jc = 6 x 10^6A/cm^2) on Epitaxial Films of Ba2LaNbO6, a New Perovskite Substrate, by Pulsed Laser Ablation." To be published in Physica C (in press). Contact J. Koshy, Regional Research Laboratory (CSIR), Trivandrum 695 019, INDIA; telefax +91 471 490 186; e-mail jacob@csrrltrd.ren.nic.in.

Mi-Ae Park, M. H. Lee, and Yong-Jihn Kim, "Compensation of Magnetic Impurity Effect in Superconductors by Radiation Damage." Submitted to Physica C. Contact Yong-Jihn Kim, Department of Physics, Korea Advanced Institute of Science and Technology, Taejon 305-701, KOREA; e-mail yjkim@taesan.kaist.ac.kr; Web site http://taesan.kaist.ac.kr/~yjkim; preprint also available at cond-mat@xxx.lanl.gov (#9710140). Key words: irradiation effect, magnetic impurity, BCS model, Gor'kov's formalism, pairing constraint.

G. B. Peacock, I. Gameson, M. Slaski, J. J. Capponi, and P. P. Edwards, "Fluorination of Mercury-Based High-Temperature Superconductors." To be published in Physica C (in press). Contact P. P. Edwards, School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, UNITED KINGDOM; telephone +44 121 414 4379; telefax +44 121 414 4403; e- mail p.p.edwards@bham.ac.uk.

W. E. Pickett, "Effect of Uniaxial Strains on the Electronic Structure of YBa2Cu3O7." To be published in Physica C (in press). Code 6604, Complex Systems Theory Branch, Naval Research Laboratory, Washington, DC 20375-5345; telephone (202) 404-8631; telefax (202) 404-7546.

T. Plackowski, A. Jezowski, C. Sulkowski, D. Wlosewicz, and H. Misiorek, "Thermal Transport in Sm1+xBa2-xCu3Oy Solid Solution." Submitted to Physica C. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 937, 50-950 Wroclaw 2, POLAND; telephone +48 71 3435021, ext. 278; telefax +48 71 441029; e-mail t.plackowski@int.pan.wroc.pl. Key words: thermal conductivity, thermoelectric power, magnetization, electrical resistivity. 74.72.Bk; 74.25.Fy; 74.25.Ha.

M. P. Raphael, M. E. Reeves, and E. F. Skelton, "Nonlinear Response of Type II Superconductors: A New Method of Measuring the Pressure Dependence of the Transition Temperature, Tc(P)." Department of Physics, Catholic University of America, Washington, DC 20064.

Marlyse Roulin, Alain Junod, and Eric Walker, "Observation of Second- Order Transitions Below Tc in the Specific Heat of YBa2Cu3Ox: Case for the Melting of a Vortex Glass." To be published in Physica C. Departement de Physique de la Matiere Condensee, Universite de Geneve, 24 quai Ernest-Ansermet, CH-1211 Geneve 4, SWITZERLAND. Key words: specific heat, vortex melting, mixed state, high-temperature superconductors, YBa2Cu3O7.

M. I. Salkola and J. R. Schrieffer, "Collective Excitations in High- Temperature Superconductors." Theoretical Division, T-11, MS B262, Los Alamos National Laboratory, Los Alamos, NM 87545; telephone (505) 665- 0416; telefax (505) 665-4063; e-mail msa@viking.lanl.gov.

S. V. Sharma, T. K. Nath, and A. K. Majumdar, "Microwave Absorption and Paracoherence Excess Conductivity Studies in High-Tc Superconductors." To be published in Physica C (in press). Department of Physics, Indian Institute of Technology, Kanpur 208016, INDIA. Key words: microwave absorption, paracoherence excess conductivity, structural property, transport property.

A. Silva-Castillo, R. A. Brito-Orta, A. Perez-Gonzalez, and F. Perez- Rodriguez, "Double Critical-State Model for the Weak-Link Regime of Granular High-Tc Superconductors." Submitted to Physica C. Instituto de Fisica de la Universidad Autonoma de Puebla, Apdo. Post. J-48, Puebla, Pue. 72570, MEXICO. 74.60.Ec; 74.60.Ge; 74.60.Jg.

Vyacheslav F. Solovyov, Vladimir M. Pan, Herbert C. Freyhardt, M. H. Ionescu, and S. X. Dou, "Vortex Decoupling Line and Its Anisotropy in Bi2Sr2CaCu2O8+d Single Crystals Observed by Jc(H,T,theta) Transport Current Measurements." Submitted to Phys. Rev. Lett. Brookhaven National Laboratory, Bldg. 480, P.O. Box 5000, Upton, NY 11973-5000; telephone (516) 344-5437; telefax (516) 344-4071; e-mail solov@sun2.bnl.gov. 74.60.Ge; 74.72.Hs; 74.72.Bk.

Nobuhisa Takezawa and Kimichika Fukushima, "Optimal Size of an Insulating Inclusion Acting as a Pinning Center for Magnetic Flux in Superconductors: Calculation of Pinning Force." To be published in Physica C (in press). Toshiba Research and Development Center, 4-1 Ukishima-cho, Kawasaki-ku, Kawasaki 210, JAPAN; telephone +81 44 288 8211; telefax +81 44 288 8071; e-mail ntakeza@eml.rdc.toshiba.co.jp. Key words: flux pinning, Ginzburg-Landau theory, type-II superconductors, pinning force, insulating inclusion.

Oleg Tchernyshyov, "Pseudogaps: A Third Peak in the Fermion Spectral Function." To be published in Phys. Rev. B. Department of Physics, Columbia University, New York, NY 10027; preprint also available at cond-mat@xxx.lanl.gov (#9710061).

J. S. Thakur, D. Neilson, and M. P. Das, "Electron Superconductivity in Coupled Electron-Hole Layers." To be published in Phys. Rev. B. Contact M. P. Das, Department of Theoretical Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra ACT 0200, AUSTRALIA; e-mail mpd105@rsphysse.anu.edu.au.

C. Traeholt, H. W. Zandbergen, T. W. Li, R. J. Drost, P. H. Kes, A. A. Menovsky, N. T. Hien, and J.J.M. Franse, "TEM Analysis of Planar Defects Induced by Ti Doping in Bi-2212 Single Crystals." To be published in Physica C (in press). National Centre for HREM, Laboratory of Materials Science, Technical University of Delft, Rotterdamseweg 137, 2628 AL Delft, THE NETHERLANDS; telefax +31 15 278 6730; e-mail zandberg@tudsv1.tudelft.nl.

J. M. Tranquada, "Modulated Spin and Charge Densities in Cuprate Superconductors." To be published in Physica B: Proc. of the Int. Conf. on Neutron Scattering (ICNS'97), Toronto, Canada, Aug. 17-21, 1997. Department of Physics, Brookhaven National Laboratory, Upton, NY 11973; e-mail jtran@bnlarm.bnl.gov; preprint also available at cond- mat@xxx.lanl.gov (#9709325).

E. Tutis, H. Niksic, and S. Barisic, "Charge Dynamics in Cuprate Superconductors." Presented at the 32nd Winter School of Theoretical Phys., Karpatz, Poland, Feb. 19-29, 1996; to be published in Solid State Phys.: From Quantum Mechanics to Technology. Institute of Physics, University of Zagreb, P.O. Box 304, Zagreb, CROATIA; H. Niksic's e-mail niksic@phy.hr; preprint also available at cond-mat@xxx.lanl.gov (#9710007).

G. A. Ummarino and R. S. Gonnelli, "Breakdown of Migdal's Theorem and Intensity of Electron-Phonon Coupling in High-Tc Superconductors." To be published in Phys. Rev. B. INFM-Dipartimento di Fisica, Politecnico di Torino, I-10129 Torino, ITALY; R. S. Gonnelli's telephone +39 11 5647350; telefax +39 11 5647399; e-mail gonnelli@polito.it; preprint also available at cond-mat@xxx.lanl.gov (#9710189). 74.50.+r.

G. A. Ummarino, R. S. Gonnelli, C. Bravi, and V. A. Stepanov, "Intrinsic Surface Depression of the Order Parameter Under Mixed (s+id)-Wave Pair Symmetry and Its Effect on the Critical Current of High-Tc SIS Josephson Junctions." To be published in J. Supercond. INFM-Dipartimento di Fisica, Politecnico di Torino, I-10129 Torino, ITALY; R. S. Gonnelli's telephone +39 11 5647350; telefax +39 11 5647399; e-mail gonnelli@polito.it; preprint also available at cond-mat@xxx.lanl.gov (#9710188). Key words: high-Tc superconductors, order parameter, Josephson junctions, Josephson critical current, pair symmetry. 74.50.+r.

A. A. Varlamov, G. Balestrino, E. Milani, and D. V. Livanov, "The Role of Density of States Fluctuations in the Normal State Properties of High Tc Superconductors." Contact E. Milani, Dipartimento di Scienze e Technologie Fisiche ed Energetiche, Universita di Roma "Tor Vergata," Via della Ricerca Scientifica, I-00133 Rome, ITALY; telefax +39 6 2021351; e-mail milani@utovrm.it; preprint also available at cond- mat@xxx.lanl.gov (#9710175). [Because of the length of this paper (175 pp.), readers are requested to download the tex version (text without figures) from the above cond-mat address and then to request a hard copy of the 41 figures from E. Milani, whose contact information is given above.]

V. K. Vlasko-Vlasov, U. Welp, G. W. Crabtree, D. Gunter, V. V. Kabanov, V. I. Nikitenko, and L. M. Paulius, "Meissner Holes and Turbulent Structures in Superconductors in Unidirectional and Rotating Fields." Submitted to Phys. Rev. B. Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, RUSSIA; preprint also available from Janice Coble, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439; telefax (708) 252-9595; e-mail janice_coble@qmgate.anl.gov.

Ronald G. Wichern, "Planar High-Tc Josephson Junctions." Submitted as a Ph.D. thesis (University of Twente). INTOSPACE GmbH, Sophienstrasse 6, D-30159 Hannover, GERMANY; telephone +49 5 11 301 0941; telefax +49 5 11 301 0928; e-mail wichern@intospace.de.

P. Wochner, J. M. Tranquada, D. J. Buttrey, and V. Sachan, "Neutron Diffraction Study of Stripe Order in La2NiO4+d with d = 2/15." Preprint #BNL64513, to be published in Phys. Rev. B. Department of Physics, Brookhaven National Laboratory, Upton, NY 11973. 75.50.Ee; 75.30.Fv; 71.45.Lr; 71.27.+a.

H. Wu, M. J. Kramer, K. W. Dennis, and R. W. McCallum, "Effect of Oxygen Partial Pressure on the Lower Solubility Limit of Nd1+xBa2-xCu3O7." To be published in Physica C. Ames Laboratory-USDOE and Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011-3020; telephone (515) 294-9559; e-mail hnwu@iastate.edu. Key words: NdBaCuO, solid solution, oxygen partial pressure.

H. Wu, M. J. Kramer, K. W. Dennis, and R. W. McCallum, "Mechanism for Flux Pinning in NdBa2Cu3O7-d Melt-Textured in Low Oxygen Partial Pressure." To be published in Appl. Phys. Lett. Ames Laboratory-USDOE and Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011-3020; telephone (515) 294-9559; e-mail hnwu@iastate.edu.

K. H. Wu, S. P. Chen, J. Y. Juang, T. M. Uen, and Y. S. Gou, "Investigation of the Evolution of YBa2Cu3O7-d Films Deposited by Scanning Pulsed Laser Deposition on Different Substrates." To be published in Physica C (in press). Institute of Electrophysics, National Chiao-Tung University, 1001 Ta Hsueh Road, Hsinchu, Taiwan 30050, REPUBLIC OF CHINA; telephone +886 3 571 2121, ext. 56114; telefax +886 3 572 5230; e-mail khwu@cc.nctu.edu.tw. Key words: pulsed-laser deposition, large area deposition, film evolution, substrate effect, (110) SrTiO3.

K. Yamafuji and T. Kiss, "Current-Voltage Characteristics Near the Glass-Liquid Transition in High-Tc Superconductors." To be published in Physica C (in press). Department of Electronic Device Engineering, Graduate School of Information Science and Electrical Engineering, Kyushu University, Fukuoka 812-81, JAPAN; telefax +81 944 531361. Key words: high-Tc superconductors, glass-liquid transition, flux pinning, E vs. J characteristics.

Masashi Yamashiro, Nobukatsu Yoshida, Yukio Tanaka, and Satoshi Kashiwaya, "Theoretical Study of the Josephson Current Through a Junction Including Ferromagnetic Insulator." Graduate School of Science and Technology, Niigata University, Ikarashi, Niigata 950-21, JAPAN; e- mail masashi@bussei.sc.niigata-u.ac.jp; preprint also available at cond- mat@xxx.lanl.gov (#9710149). Key words: Josephson junction, ferromagnetic insulator, exchange interaction, pi-junction.

Y. Yang, J. Gao, T. C. Chui, and L. Li, "Microstructural Study of Tilted Epitaxial Thin Films of YBa2Cu3O7-d with a (105) Orientation." To be published in Physica C (in press). Contact J. Gao, Department of Physics, University of Hong Kong, Pokfulam Road, Hong Kong, HONG KONG; telefax +852 2559 9152; e-mail jugao@hku.hk. Key words: thin films, anisotropic superconductors, defect structures.

R. Yu, V. Gomis, N. Vilalta, F. Sandiumenge, B. Martinez, S. Pinol, and X. Obradors, "Growth Rate Dependence of the Critical Currents in Directionally Solidified YBa2Cu3O7-Y2BaCuO5 Superconducting Bars." To be published in Physica C (in press). Contact B. Martinez, Institut de Ciencia de Materials de Barcelona, CSIC, Campus de la UAB, E-08193 Bellaterra, SPAIN; telephone +34 9 3580 1853; telefax +34 9 3580 5729. Key words: textured superconducting composites, single-domain growth, processing rate. 74.60.Jg.

Y. G. Zhao, S. B. Ogale, R. Shreekala, Z. W. Dong, S. P. Pai, M. Rajeswari, T. Venkatesan, W. L. Cao, W. Lu, and Chi Lee, "Laser Power and Temperature Dependence of the Transient Photoimpedance Response of Epitaxial YBa2Cu3O7-d Thin Films." To be published in J. Appl. Phys. Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, MD 20742-4111.

W. J. Zhu, P. H. Hor, A. J. Jacobson, G. Crisci, T. A. Albright, S. H. Wang, and T. Vogt, "A2Cu2CoO2S2 (A=Sr,Ba): A Novel Example of a Square- Planar CoO2 Layer." Preprint #97:123; to be published in J. Am. Chem. Soc. 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.

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

Jan. 29 - 30, 1998: HTS Wire Development Workshop, St. Petersburg Bayfront Hilton, St. Petersburg, Fla. Sponsored by the U. S. Department of Energy. Workshop objectives: (1) First generation HTS wires: hear updates on wire requirements and recent progress towards maximizing Jc and J_e and increasing flux pinning; (2) Second generation HTS wires: review progress with respect to the critical issues for YBCO and TBCCO coated conductors -- scalability of substrate preparation and superconductor deposition processes; technology needs such as physical property measurements, joining, and diagnostics; and correlation of microstructure with critical currents; (3) Consider new partnerships to help address the critical issues that must be resolved if practical HTS wires are to be commercially successful. For more information contact Audrey Lamanna, Energetics Inc., telephone (202) 479-2748; or Robert Hawsey, Superconductivity Program, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6195; telephone (423) 574-8057; telefax (423) 574-6073; e-mail hawseyra@ornl.gov; Web sites http://www.ornl.gov/HTSC/htsc.html or http://www.eren.doe.gov/superconductivity/.

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

*May 3 - 8, 1998: Fullerenes: Chemistry, Physics and New Directions XI, 193rd Meeting of the Electrochemical Society, Sheraton San Diego Hotel & Marina, San Diego, Calif. Papers are invited for Symposium N16 -- Fullerene-Based Superconductors. Selected papers in the program may be assigned to a poster session. Publication of a proceedings volume is planned. Specific details about the format for contributed papers for the proceedings can be obtained from the session organizers. Abstract deadline, January 2, 1998. Contact V. Buntar, Atominstitut der OEsterreichischen Universitaeten, Schuettelstr. 115, A-1020 Vienna, Austria; telephone +43 1-727-01296; telefax +43 1-728-9220; e-mail buntar@ati.ac.at or M. Nunez-Regueiro, Centre de Recherches sur les Tres Basses Temperatures, Centre National de la Recherche Scientifique, BP 166 Cedex 09, F-38042 Grenoble, France; telephone +33 7-688-7838; telefax +33 7-687-5060; e-mail nunez@labs.polycnrs-gre.fr. For general conference information, contact the Electrochemical Society, Inc., 10 South Main Street, Pennington, NJ 08534-2896; telephone (609) 737-1902; telefax (609) 737-2743; e-mail ecs@electrochem.org.

*May 26 - 28, 1998: Tenth International Cryocooler Conference, Monterey Conference Center, Monterey, Calif. Technical program will consist of oral and poster sessions. Invited technical topics include Stirling and pulse-tube cryocoolers, J-T and sorption cryocoolers, G-M and TEC cryocoolers, new concepts, component developments, modeling and test techniques, performance and life test data, applications and integration issues, and low-cost coolers. Oral and poster sessions. Abstract deadline, December 12, 1997. For information, contact Peter Kittel, ICC10, MS-244-10, NASA/Ames Research Center, Moffett Field, CA 94035- 1000; telephone (650) 604-4297; telefax (650) 604-1094; e-mail pkittel@mail.arc.nasa.gov.

July 19 - 24, 1998: Superconducting Superlattices II -- Native and Artificial: Symposium SD81 of the SPIE's Annual Meeting on Optical Science, Engineering, and Instrumentation, San Diego Convention Center and the Marriott Hotel & Marina, San Diego, Calif. Conference will include papers are devoted to structural, electronic, transport, and other phenomena in such heterostructures and intercalates. Experimental and theoretical papers which are related to superconducting superlattices are solicited in the following areas: (1) epitaxial and morphological properties, interface smoothness and disorder, layer thickness fluctuations, interdiffusion, and strain, structure of defects; (2) critical temperature, critical currents, and critical magnetic fields; (3) nature of c-axis transport in cuprates and artificial superlattices; (4) electronic structure, charge redistribution, localization, single-particle and collective excitations; (5) Josephson phenomena in natural and artificial superlattices and Josephson plasma oscillations; (6) structure of flux lines, thermal and field-induced flux motion, intrinsic flux pinning; (7) effective dimensionality and dimensional crossovers, superconductivity in ultrathin layers, Kosterlitz-Thouless transition; and (8) proximity effects: superconductors in contact with insulators, semiconductors, normal metals, ferro- and anti-ferromagnets, piezoelectrics, etc. Abstract deadline, December 22, 1997. Abstracts may be submitted by Web page, e-mail, regular mail, or fax. Proceedings to be published. For information, contact SPIE, P.O. Box 10, Bellingham, WA 98225; telephone (360) 676-3290; telefax (360) 647-1445; e-mail SD98@spie.org; Web site http://www.spie.org.

July 19 - 24, 1998: Superconducting and Related Oxides: Physics and Nanoengineering III, Symposium SD82, is third in the series of SPIE conferences focused on basic issues in physics and materials science of high-temperature superconductors and related compounds that may be relevant for their applications in electronics, optics, and optoelectronics. Venue is the same as in the previous listing. Scientists and engineers engaged in research on superconducting materials and related compounds, as well as their novel applications, are invited to participate. Original papers are solicited on, but not limited to, the following topics: (1) structural, transport, magnetic, thermal properties of thin films of cuprates and related compounds; (2) homoepitaxy and new substrate materials; (3) search for novel high- temperature superconducting phases by atomic engineering; (4) composition and structure of defects; (5) anion and cation substitutions, metal-insulator transition, and localization; (6) proximity effects; surface and interface effects; superconductors in contact with insulators, semiconductors, normal metals, ferro- and antiferromagnets, piezoelectrics, etc.; (7) novel device concepts, electric field effect in heterostructures, hybrid optoelectronic devices, and cryo-electronics. A round-table discussion is planned in which representatives of prominent groups in industry, academia, and national laboratories will be invited to expound on their respective progress and strategies in combining basic physics and materials research and developing specific applications, and discuss the future of superconducting electronics. Abstract deadline, December 22, 1997. Abstracts may be submitted by Web page, e-mail, regular mail, or fax. Proceedings to be published. For information, contact SPIE, P.O. Box 10, Bellingham, WA 98225; telephone (360) 676-3290; telefax (360) 647- 1445; e-mail SD98@spie.org; Web site http://www.spie.org.

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

Position Wanted: Ph.D. with research and teaching experience in condensed-matter theory (layered models of high-temperature superconductors, tunneling in HTSC, recombination in semiconductors) seeks suitable position. Contact Yuri M. Shukrinov, Physical Technical Institute, Tajik Academy of Sciences, Aini St. 299/1, Dushanbe, Tajikistan 734063, C.I.S.; e-mail shukri@td.silk.org.

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, #22, November 15, 1997.