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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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:

High-Tc SQUIDs

When SQUIDs (superconducting quantum interference devices) of conventional washer design are cooled in the earth's magnetic field (about 0.5 G or 50 microTeslas), vortices are usually trapped in the body of the SQUID. At 77 K, thermally excited motion of these vortices produces a substantial amount of low-frequency flux noise. A breakthrough in solving this problem is reported in a preprint by E. Dantsker et al. (UC-Berkeley and LBNL). The authors report that devices containing arrays of slots or holes, such that the linewidths in the remaining YBa2Cu3O7-d film are no larger than 4 micrometers, exhibit virtually no increase in their low-frequency noise when cooled in static magnetic fields up to a certain threshold, above 100 microTeslas in the best case. Furthermore, the mutual inductance between these devices and a seven-turn spiral coil has been found to be at least 85% of that for a solid SQUID with the same outer dimensions.

ZBCP

In the d_[x^2-y^2] model for the cuprates, Andreev surface states have been predicted to be observable in the subgap tunneling conductance for ab-plane tunneling. A preprint by M. Fogelstroem (Northwestern) et al. further predicts that in a parallel magnetic field H, surface currents shift the quasiparticle bound-state spectrum and lead to a voltage splitting of the zero-bias conductance peak (ZBCP) that is linear in H at low fields. A subdominant order parameter, stabilized by the surface, leads to a splitting of the ZBCP in zero external field and to spontaneous surface currents. The field evolution of the subgap conductance peaks is nonlinear near the surface transition.

Data from ab-oriented YBa2Cu3O7-d/I/Cu tunnel junctions, presented by M. Covington (Illinois-Urbana) et al., confirm these ideas. In these junctions, self-assembled monolayers form the insulating tunnel barrier I. The YBa2Cu3O7-d features in the tunneling conductance match those of low-leakage ab-oriented YBa2Cu3O7-d/Pb junctions. The results show that the ZBCP is an Andreev bound state due to a d-wave order parameter. In zero magnetic field, the ZBCP splits below ~7 K, signifying the presence of a subdominant order parameter at the surface. An applied magnetic field induces further splitting, which grows nonlinearly with increasing field.

Charge Stripes

Recent neutron-diffraction studies in La1.6-xNd0.4SrxCuO4 have yielded evidence that holes doped into the CuO2 planes segregate into stripes that separate antiferromagnetic domains. A preprint by J. M. Tranquada (Brookhaven) now shows that such a picture provides a quantitatively consistent interpretation of the spin fluctuations measured by neutron diffraction in La1.85Sr0.15CuO4 and YBa2Cu3O6+x.

YBa2Cu3O7-d

NMR transverse relaxation (TR) measurements of [17]^O(2,3) (CuO2- plane sites) in YBa2Cu3([16]^O1-c[17]^Oc)7 have been carried out by A. Keren et al. (Orsay), who found a Gaussian-like relaxation. The authors varied c, the temperature, and the external field, and compared the results with those at the [17]^O(4) (apical-oxygen) site. The results are consistent with a model in which this relaxation is caused by dynamical fluctuations of copper nuclei, including both spin-lattice and flip-flop processes. Using this model, the authors also can explain the TR of [89]^Y and [64]^Cu(1) (chain copper). The authors reanalyzed previous [63]^Cu(2) (plane copper) TR data and obtained the dynamical exponent z = 1.

A preprint by A. I. Rykov and S. Tajima (SRL-ISTEC) reports the appearance of a split double-peak fishtail effect in untwinned YBa2Cu3O7-d single crystals. The authors found that the splitting of the fishtail disappeared after sample retwinning. The authors explain the splitting by the influence of in-plane anisotropy on the fishtail effect.

Bi Cuprates

Electron-tunneling evidence for a pseudogap in the excitation spectrum of Bi2Sr2CaCu2O8+d (Bi-2212) single crystals is reported by H. J. Tao (Chinese Academy of Sciences and Polytechnic) et al. The normalized conductance curves show that the gap structure does not disappear at Tc (85-90 K) but rather at a higher temperature T*, which is in the range 100-110 K for the three junctions investigated. The results support the existence of paired carriers in the normal state of the cuprate superconductor Bi-2212.

A preprint by K. Kawano and A. Oota (Toyohashi University of Technology) reports the use of a scanning Hall sensor (active area 50 micrometer x 50 micrometer) to probe two-dimensional remanent self- field distributions in Ag-sheathed (Bi,Pb)2Sr2CaCu2O8+d monofilamentary tapes. The results suggest that the critical current density along the tape length is about double that along the tape width. The experimental behavior is qualitatively explained via numerical calculations using the Biot-Savart law.

Ten factors relating to Bi-2223/Ag tape production and thermomechanical processing have been examined by J. O. Willis et al. (Los Alamos) in a statistically designed study to determine optimal parameter values for high critical current density Jc in rolled tapes. The study indicated that low-fill-factor, narrow tapes processed for long times yield the best Jc values, and that strain rate is not a significant factor. The major microstructural conclusion is that macrocracking, even at the early stages of tape processing, should be avoided, as these cracks cannot easily be healed.

Tl and Hg Cuprates

The excitations across the superconducting gap (2Delta peak in B_[1g]-symmetry Raman spectra) in an overdoped Tl2Ba2CuO6+d (Tl-2201) single crystal have been studied by G. Blumberg (Illinois-Urbana and Tallinn) et al. The 2Delta-peak intensity, which the authors interpret as the density of the superconducting condensate around the gap antinodes, is a linear function of temperature but a nonlinear function of magnetic field. The latter is attributed to renormalization of the quasiparticle spectra near vortices in the mixed state. The 2Delta peak is present above the irreversibility line and yields a conventional temperature dependence (with negative curvature) of the effective upper critical field.

Electronic Raman scattering measurements on HgBa2Ca2Cu3O8+d (Hg-1223, Tc = 130 K) in the normal and superconducting states are reported by X. Zhou (MPI-Stuttgart) et al. Below Tc, superconductivity-induced spectral redistributions of the electronic continuum have been observed for different polarizations. In the B_[1g] channel, the authors observed three distinct peaks at 380, 660, and 800 cm^[-1], which the authors interpret in terms of different order parameters associated with different sheets of the Fermi surface.

Defects that affect Tc in Tl2Ba2CuO6+d (Tl-2201) and HgBa2CuO4+d (Hg- 1201) have been characterized by J. D. Jorgensen (Argonne) et al. using neutron powder diffraction. In Tl-2201, the dominant defect is interstitial oxygen between the two TlO planes, but Cu substitution on the Tl site also affects properties, and there is evidence for a second oxygen defect for compositions near the optimum Tc. In Hg- 1201, there are two competing oxygen defects in the Hg layer. The relative concentrations of these defects switches upon passing from the underdoped region, through the maximum Tc, to the overdoped region. The authors suggest that this behavior could result from a change in the topology of the Fermi surface upon passing through the Van Hove singularity.

Other Cuprates

Using a high-pressure and high-temperature technique, P. Bordet et al. (Grenoble) have synthesized a superconducting gold cuprate with a magnetically determined Tc above 80 K. The material is AuBa2(Y1- xCax)Cu2O7 (Au-1212), where the highest Tc ~~ 82 K was achieved for x ~~ 0.4. For x = 0, the formal copper valence is 2+ and the compound is insulating.

A preprint by T. Ito (Tokyo Tech and Tokai) et al. reports the synthesis of nonstoichiometric BaCuO2+d as a precursor for the high- pressure synthesis of CuBa2Can-1CunOx [Cu-12(n-1)n] superconductors with no external oxidizing agents. Using this precursor, the authors produced a sample with Tc = 116 K after sintering at 1100^oC under 5 GPa, and identified the 116 K phase as the Cu-1234 phase. A sample with a main phase with Tc = 80 K was obtained at temperatures as low as 950^oC. The 80 K phase was identified as Cu-1223. A related paper by H. Suematsu (Tokyo Tech) et al. reports studies of carbon contamination in Cu-1234 superconductors.

A high-temperature superconducting compound in the Ba-Ca-Cu-O system is reported by C. W. Chu et al. (TCSUH). The authors synthesized Ba2Can-1+xCun+yOz = (CaxCuy)Ba2Can-1CunOz using a high-pressure technique and obtained for n = 3 a magnetically determined Tc up to 126 K. By varying the synthesis conditions, the authors also obtained three other superconducting phases at 90, 105, and 116 K.

As reported by H. Yamamoto et al. (NTT), a new high-Tc superconducting cuprate composed of Ba, Cu, and O has been prepared on a SrTiO3 (001) substrate. The superconducting phase forms only at temperatures 575-625^oC and in a narrow compositional range. Evidence from x-ray diffraction and transmission electron microscopy suggests that the superconducting phase is a 214-based structure. Superconductivity is obtained only after strong oxidation after film growth. Resistivity measurements show Tc(onset) 60-70 K and Tc(end) <= 38 K, while magnetic measurements show Tc(onset) = 85-90 K.

Borocarbides

Scanning-tunneling-microscope (STM) observations of the superconducting energy gap and vortex lattice structure on the (001) face of a LuNi2B2C single crystal are reported by Y. De Wilde (Argonne) et al. In zero field, the conductance versus voltage characteristics consistently showed a peaked structure that could be fitted with a broadened BCS-like density of states, giving a gap value of 2.2 meV and 2Delta/k_BTc = 3.2+-0.1, implying weak-coupling superconductivity. In applied magnetic fields of 0.375 T and 1.5 T, the authors used STM to observe a square vortex lattice, whose unit cell is rotated 45 degrees with respect to the crystallographic unit cell. The vortex-lattice structure is analyzed in terms of a Ginzburg-Landau theory with an added free-energy term with four-fold symmetry arising from the tetragonal crystal structure.

A preprint by M. R. Eskildsen (Riso) et al. reports studies of the flux-line lattice in YNi2B2C (Tc = 15.6 K) and LuNi2B2C (Tc = 16.6 K), the nonmagnetic end members of the borocarbide superconductors, using small-angle neutron-scattering and transport measurements. For magnetic fields H||c, the authors find a square flux-line lattice, which disorders rapidly above H/H_[c2] ~ 0.2. The results for H/H_[c2] < 0.2 can be understood within the collective pinning model. For H/H_[c2] > 0.2, the disordering appears to be associated with the field dependence of the shear modulus c_[66]. This effect is separate and distinct from the peak effect in the critical current, which occurs at H/H_[c2] = 0.9.

Vortices

Results from extensive simulations of driven vortex lattices interacting with periodic arrays of pinning sites are reported by C. Reichhardt et al. (Michigan). The authors find that changing the applied driving force produces a rich variety of dynamic plastic-flow phases, which are distinct from those observed in systems with random pinning arrays. Signatures of the transition between the different dynamic phases include sudden jumps in the current-voltage curves and marked changes in the vortex trajectories and vortex-lattice order. The authors present several dynamic phase diagrams relating the pinning force, driving force, flux density, and disorder in the pinning-site location.

As pointed out by G. E. Volovik (Helsinki University of Technology and Landau Institute), in d-wave superconductors the electronic entropy associated with an isolated vortex diverges logarithmically with the size of the system. In a vortex array, the entropy per vortex per layer S_V is thus considerably larger than k_B. The author therefore finds it natural that there will be a large entropy jump of order k_B at the first-order vortex solid-liquid transition. In the author's view, the entropy jump arises from the extra electronic degrees of freedom on the vortex background, which is modified by the vortex transition.

A preprint by J. Hu (Florida State and Indiana) and A. H. MacDonald (Indiana) reports on a Monte Carlo study of the lowest-Landau-level limit of the Lawrence-Doniach model for a layered superconductor. The authors obtain results that are consistent with a single first- order transition between a 3D vortex solid and a high-temperature vortex liquid. The authors construct a universal phase diagram in terms of dimensionless parameters characterizing intralayer and interlayer couplings.

The effect of disorder on flux-line-lattice (FLL) melting and the peak effect in 2H-NbSe2 has been studied by S. S. Banerjee (TIFR) et al. On the upper branch of the peak-effect curve (magnetic field vs. temperature curve), the authors observe a step-wise disordering of the FLL, suggesting two first-order transitions spanning the peak- effect region. The lower, reentrant part of the curve is found to be strongly affected by disorder. This branch and the nose disappear with increasing disorder. The authors discuss the results in terms of disentangled and entangled flux liquids.

As reported by W. Henderson (Rutgers) et al., the complex surface impedance of 2H-NbSe2 has been measured in the mixed state over a wide range of magnetic fields (0-2 T) and frequencies (20-3000 MHz). The authors find a crossover between pinned and viscous dynamics of flux lines at a pinning frequency omega_p. When the flux lattice is prepared in a metastable disordered state by field cooling, the authors find that omega_p is two orders of magnitude higher than expected from a single-particle washboard-potential model for the pinning interaction.

Theory

A preprint by A. H. Castro Neto (UC-Riverside) reports a theoretical study of the problem of phase coherence in doped striped cuprates. The author assumes the stripes form a network of one-dimensional Luttinger liquids which are dominated by superconducting fluctuations and pinned by impurities. To study phase coherence, the author studies the dynamics of the superconducting phase using a model of resistively shunted junctions, which leads to a Kosterlitz-Thouless transition. The author obtains results that are consistent with recent experiments in Zn-doped cuprates.

An electronic model based on the creation of an impurity band whose Fermi level is pinned to the middle of the Mott-Hubbard gap has been proposed by W. Y. Liang (IRC-Cambridge). The author finds that increased doping causes more electron states to be transferred from the Mott-Hubbard bands to the impurity band, and also increases the transfer integral for conduction electrons.

As shown by I. Kosztin and A. J. Leggett (Illinois-Urbana), under certain conditions the low-temperature behavior of the magnetic penetration depth lambda(T) of a pure d-wave superconductor is determined by nonlocal electrodynamics, and the deviation Delta- lambda(T) = lambda(T) - lambda(0) is proportional to T^2, not to T. The authors predict that the behavior Delta-lambda(T) proportional to T^2 due to nonlocality should be observable in nominally clean high- Tc superconductors below a crossover temperature T* = (xi_0/lambda_0)Delta_0 ~ 1 K. The authors also discuss complications due to impurities, surface quality, and crystal orientation.

A preprint by E.V.L. de Mello and C. Acha (Grenoble) applies a method based on the extended Hubbard Hamiltonian to obtain the dependence of the critical temperature of HgBa2CuO4+d (Hg-1201) and related Hg cuprates as a function of carrier density. The theory also accounts for the pressure dependence of Tc.

The electronic polarizability in the superconducting state near extremum vectors Q_0 of the Fermi surface has been calculated by H.- Y. Kee (Rutgers and Bell Labs) and C. M. Varma (Bell Labs). The authors find a pole in the polarizability at frequencies omega near the superconducting gap 2Delta which leads to a sharp peak at omega just below 2Delta in the lattice vibrations near Q_0. The results are compared with recent inelastic neutron-scattering measurements in ANi2B2C (A = Y or Lu).

A quantitative model for triplet superconductivity in Sr2RuO4, based on first-principles calculations for the electronic structure and magnetic susceptibility, has been proposed by I. I. Mazin (NRL and George Mason) and D. Singh (NRL). The authors propose that the superconductivity is due to ferromagnetic spin fluctuations, which are strong at small wave vectors.

Thin Films

A preprint by M. J. Qin et al. (Nanjing) extends the critical-state model of Mikheenko and Kuzovlev and of Zhu et al. to self- consistently incorporate field dependence of the critical current density Jc(B). Using a model for Jc(B), the authors were able to obtain a good fit to magnetization measurements on a disk-shaped YBa2Cu3O7-d thin film in a perpendicular field.

The preparation of Hg-1212 films by laser ablation on (100) SrTiO3 substrates is reported by J. D. Guo et al. (Peking University). The zero-resistance transition temperature was found to be 121 K.

Measurements of the temperature dependence of the 87 GHz surface resistance and the change of the penetration depth in two c-axis- oriented YBa2Cu3O7-d films are reported by S. Hensen (Wuppertal) et al. The authors also did an extensive theoretical analysis to compare the experimental results with those expected from d- and s- wave models of superconductivity. The data were found to be well described in the entire temperature range in terms of a d-wave model of superconductivity.

A systematic study of the relation between the film-growth conditions and transport properties of layered cuprate films having multiple fluorite-type blocks has been carried out by S. Ikegawa and Y. Motoi (Toshiba). The authors suggest that this material may serve as a good artificial barrier for trilayer Josephson junctions.

A preprint by Q. Gan et al. (Duke) reports details of the growth of epitaxial SrRuO3 thin films on vicinal (001) SrTiO3 substrates.

Applications

Measurements of the levitation force on a permanent magnet above single-domain YBa2Cu3O7-d samples of different orientations are reported by D. Shi et al. (Cincinnati). The authors find that the levitation force is maximized when the c axis of the domain is parallel to the direction of the force.

Detailed numerical calculations of levitation forces between a permanent magnet and a cylindrical superconductor based upon the critical state model are reported in a preprint by D. Camacho et al. (Barcelona). Excellent agreement with experiment is found. Related studies of magnetic levitation by melt-processed YBCO are reported in two preprints by R. Yu et al. (Barcelona).

The design and fabrication of a 1.5 GHz four-stage microstrip bandpass filter is reported by A. Enokihara and K. Setsune (Matsushita Electric). The filter, which used a miniaturized hairpin resonator structure to reduce the device's size, was fabricated using Tl2Ba2CaCu2O8+d (Tl-2212) thin films of thickness 700 nm on both surfaces of a 12 x 12 mm^2 LaAlO3 substrate. The authors report that this HTS filter offers both small size and low insertion-loss performance at 77 K in a frequency range of interest for practical mobile communication systems.

Other Activities

Photoexcitation experiments in high-Tc YBa2Cu3O7-d grain-boundary Josephson junctions have been carried out by J. Elly (Nice) et al. The authors found that, while the Josephson critical current is enhanced and the normal-state resistance decreases, the positions of the extrema in the Fraunhofer diffraction pattern remain unchanged. These measurements indicate that the magnetic field penetration depth is unaffected by light irradiation. On the other hand, the irradiation produces substantial increases in the voltage and intensity of the Fiske steps due to electromagnetic resonances, which indicates that the dielectric constant of the barrier changes by a large factor.

The temperature dependence of the anisotropic upper critical magnetic field H_[c2](T) in the quasi-one-dimensional molecular superconductor (TMTSF)2PF6 has been determined resistively by I. J. Lee (SUNY- Buffalo) for the intrachain a, interchain b, and interplane c* directions. For H along a and b, H_[c2](T) exhibits pronounced positive curvature, with no sign of saturation to 0.1 K. Anisotropy inversion is observed, where H_[c2]^b grows larger than H_[c2]^a and exceeds the paramagnetic limit by more than 200%. The anomalous shape of H_[c2](T) is consistent with recent predictions of unconventional behavior in anisotropic superconductors, including the possibility of triplet pairing and reentrant superconductivity in very high field.

Two preprints by S. Sasaki (NTT) et al. report [13]^C Knight-shift and spin-lattice relaxation measurements in K3C60. The results are consistent with s-wave pairing.

Overviews

The growth of large RBCO (R = rare earth) single crystals has been reviewed by X. Yao and Y. Shiohara (SRL-ISTEC). The authors discuss growth processes and superconducting properties. Several factors lead to growth rates a factor of two to five above those for YBCO: (a) using high oxygen partial pressure, (b) choosing rare earth elements with higher solubilities in the Ba-Cu-O solution, and (c) growing RBCO crystals with mixed rare earths. Large YBa2Cu3O7-d and Nd1-xBa2+xCu3O7-d crystals were grown with edge sizes over 25 mm along the a and b directions and up to 20 mm in the c direction (28 refs.).

Contributed by John R. Clem

Contents: Preprints begin on page 5; Coming Events begin on page 14; and FYI is on page 15.

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

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.

Ahmed M. Al-Saie and Ali E. Khalil, "Monte-Carlo Simulation on Two Dimensional Lattice with Thermal Disorder in High Temperature Superconductors." Submitted to Phys. Rev. B. Department of Physics, University of Bahrain, P.O. Box 32038, BAHRAIN.

A. A. Andronov, V. V. Kurin, I. M. Nefedov, and I. A. Shereshevskii, "Dynamics of Phase Slip Centers in a Narrow Superconducting Channel." Submitted to J. Low Temp. Phys. Institute for Physics of Microstructures, Russian Academy of Science, Nizhny Novgorod, GSP- 105, 603600, RUSSIA; e-mail andron@ipm.sci-nnov.ru.

P. Ao and X.-M. Zhu, "Vortex Dynamics Within the BCS Theory." 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 Theoretical Physics, Umea University, S-901 87 Umea, SWEDEN.

S. S. Banerjee, N. G. Patil, Subir Saha, S. Ramakrishnan, A. K. Grover, S. Bhattacharya, G. Ravikumar, P. K. Mishra, T. V. Chandrasekhar Rao, V. C. Sahni, C. V. Tomy, G. Balakrishnan, D. McK. Paul, and M. J. Higgins, "Effect of Disorder on the Peak Effect and Structure of Flux Line Lattice in 2H-NbSe2." Preprint #TIFR/CM/97- 101(I); submitted to Phys. Rev. Lett. Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, INDIA; e-mail sb@tifrvax.tifr.res.in. Key words: reentrant peak effect, vortex melting, disorder effects, metastability, 2H-NbSe2. 64.70.Dv; 74.60.Ge; 74.25.Dw; 74.60.Ec; 74.60.Jg.

G. Blumberg, Moonsoo Kang, and M. V. Klein, "Electronic Raman Scattering of Overdoped Tl2Ba2CuO6+d in High Magnetic Fields." To be published in Phys. Rev. Lett. NSF Science and Technology Center for Superconductivity and Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801-3080. 78.30.Er; 74.25.Ha; 74.60.Ec; 74.72.Fq.

V. Boffa, T. Petrisor, L. Ciontea, U. Gambardella, and S. Barbanera, "High-Quality Surface YBCO Thin Films Prepared by Off-Axis Pulsed Laser Deposition Technique." To be published in Physica C (in press). ENEA Centro Ricerche Frascati, Via E. Fermi 45, I-00044 Frascati, Rome, ITALY. Key words: YBCO thin film, off-axis PLD, electrical resistivity, critical current density, XRD, SEM.

J. Bok and J. Bouvier, "Comment on 'Influence of a van Hove Singularity on the Electronic Specific Heat of High-Tc Superconductors.'" To be published in Physica C (in press). Laboratoire de Physique du Solide UPR 5 CNRS ESPCI, 10 rue Vauquelin, F-75231 Paris Cedex 05, FRANCE; telefax +33 1 40 79 4425; e-mail julien.bok@espci.fr.

P. Bordet, S. LeFloch, C. Chaillout, F. Duc, M. F. Gorius, M. Perroux, J. J. Capponi, P. Toulemonde, and J. L. Tholence, "AuBa2(Y1- x,Cax)Cu2O7: A New Superconducting Gold Cuprate with Tc Above 80 K." To be published in Physica C (in press). Laboratoire de Cristallographie, CNRS, BP 166, F-38042 Grenoble Cedex 9, FRANCE.

D. Camacho, J. Mora, J. Fontcuberta, and X. Obradors, "Calculation of Levitation Forces in Permanent Magnet-Superconductor Systems Using Finite Element Analysis." To be published in J. Appl. Phys. Institut de Ciencia de Materials de Barcelona (CSIC), Campus Universitat Autonoma de Barcelona, E-08193 Bellaterra, Catalunya, SPAIN; X. Obradors' telephone +34 3 5801853; telefax +34 3 5805729; e-mail xavier.obradors@icmab.es. 85.25.Ly.

M. Cantoni, Y. Tanaka, M. Ishizuka, and S. Horiuchi, "Microstructure Evolution in High-Tc Bi(Pb)-2223/Ag(Hf) Tapes." To be published in Physica C (in press). National Institute for Research in Inorganic Materials, Namiki 1-1, Tsukuba, Ibaraki, 305 JAPAN; telefax +81 298 51 4976; e-mail mcantoni@nirim.go.jp. Key words: Bi(Pb)-2223/Ag(Hf) tape, high-Jc, microstructure, HRTEM, amorphous phase, tilt-type subgrain boundary.

A. H. Castro Neto, "Superconducting Phase Coherence in Striped Cuprates." Department of Physics, University of California, Riverside, CA 92521; e-mail neto@phyun6.ucr.edu; preprint also available at cond-mat@xxx.lanl.gov (#9702180). 74.20.Mn; 74.50.+r; 74.72.Dn; 74.80.Bj.

Wu-Ming Chen, J. Chen, and X. Jin, "A Modified Function of the Formula of Double Iodometric Titration." To be published in Physica C (in press). Department of Physics and National Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210093, PEOPLE'S REPUBLIC OF CHINA.

C. W. Chu, Y. Cao, Z. L. Du, L. Gao, D. K. Ross, I. A. Rusakova, Y. Y. Sun, N. L. Wu, and Y. Y. Xue, "Search for Novel High Temperature Superconducting Materials: A New 126 K System, Ba2Can-1+xCun+yOz." Preprint #97:021; submitted to the Proc. of the 5th Int. Conf. on Mater. and Mech. of Supercond. -- High-Temp. Supercond. (M^2S-HTSC V), Beijing, People's Republic of China, Feb. 28-Mar. 4, 1997. 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.

L. F. Cohen, A. A. Zhukov, G. K. Perkins, J. Totty, A. D. Caplin, H. Kupfer, T. H. Wolf, and G. Wirth, "Effect of Columnar Defects on the Vortex Dynamics in a Twinned YBCO 123 Crystal." 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. Blackett Laboratory, Imperial College, Prince Consort Road, London SW7 2BZ, UNITED KINGDOM.

M. Covington, M. Aprili, E. Paraoanu, L. H. Greene, F. Xu, J. Zhu, and C. A. Mirkin, "Observation of Surface-Induced Broken Time- Reversal Symmetry in YBa2Cu3O7 Tunnel Junction." Submitted to Phys. Rev. Lett. Department of Physics, University of Illinois at Urbana- Champaign, Urbana, IL 61801; L. H. Greene's telephone (217) 333-7315; telefax (217) 244-7187; e-mail lhg@uiuc.edu. 74.50.+r; 74.72.-h.

B. Dabrowski, K. Rogacki, J. W. Koenitzer, K. R. Peoppelmeier, and J. D. Jorgensen, "Optimized Synthesis and Properties of Chemically Stabilized CuSr2YCu2O7." To be published in Physica C (in press). Department of Physics, Northern Illinois University, DeKalb, IL 60115; telefax (630) 252-7777.

E. Dantsker, S. Tanaka, and John Clarke, "High-Tc SQUIDS with Slots or Holes: Low l/f Noise in Ambient Magnetic Fields." Submitted to Appl. Phys. Lett. Department of Physics, University of California, Berkeley, CA 94720. 74.76.Bz; 85.25.Dq.

Udayan De, P.M.G. Nambissan, S. Chaudhuri, D. Sanyal, and D. Banerjee, "Electron Momentum Redistribution Due to Superconducting Transition in Bi-2212 and (Bi,Pb)-2223 Oxides." Submitted to Physica B. Variable Energy Cyclotron Centre, 1/AF Bidhannagar, Calcutta 700064, INDIA; telefax +91 33 334 6871; e-mail ude@veccal.ernet.in. Key words: high-temperature superconductivity, positron annihilation, electron momentum distribution.

E.V.L. de Mello and C. Acha, "Study of the Phase Diagram and the Tc Pressure Dependence in the HgBa2CuO4-d 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. Centre National de la Recherche Scientifique, Centre de Recherche sur les Tres Basses Temperatures, B.P. 166, F- 38042 Grenoble Cedex, FRANCE; e-mail mello@crtbt-theo.polycnrs- gre.fr; preprint also available at cond-mat@xxx.lanl.gov (#9702131).

E.V.L. de Mello and C. Acha, "The Extended Hubbard Model Applied to Study the Pressure Effects in High Temperature Superconductors." Centre National de la Recherche Scientifique, Centre de Recherche sur les Tres Basses Temperatures, B.P. 166, F-38042 Grenoble Cedex, FRANCE; e-mail mello@crtbt-theo.polycnrs-gre.fr. 71.10.Fd; 74.62.Fj; 74.25.Dw. (This is a larger version of the preprint entered above).

Y. De Wilde, M. Iavarone, U. Welp, V. Metlushko, A. E. Koshelev, I. Aranson, G. W. Crabtree, P. L. Gammel, D. J. Bishop, and P. C. Canfield, "The Superconducting Energy Gap and Vortex Lattice Structure in LuNi2B2C." Submitted to Phys. Rev. B. Contact Janice Coble, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439; telefax (708) 252-9595; e-mail janice_coble@qmgate.anl.gov.

P. Diko, H. Kojo, and M. Murakami, "Microstructure of Nd-Ba-Cu-O Superconductors Prepared by the Oxygen-Controlled-Melt-Growth Method." To be published in Physica C (in press). Superconductivity Research Laboratory, International Superconductivity Technology Center (ISTEC), 1-16-25 Shibaura, Minato-ku, Tokyo 105, JAPAN; telefax +81 3 3454 9287. Key words: bulk HTSC, microscopy, thermal microstresses, microcracking, twins, subgrains. 74.25; 74.72; 61.72.

Mauro M. Doria, Gilberto Hollauer, F. Parage, and O. Buisson, "Plasma Waves in Anisotropic Superconducting Films Below and Above the Plasma Frequency." Instituto de Fisica, Universidade Federal Fluminense, C.P. 100.093 Niteroi 24001-970 RJ, BRAZIL; e-mail mmd@if.uff.br; preprint also available at cond-mat@xxx.lanl.gov (#9702033).

V. Dyakonov, I. Fita, N. Doroshenko, M. Baran, S. Piechota, and H. Szymczak, "Insulator-Superconductor Transition in NdBa2Cu3O6.67 Ceramics Under Pressure." To be published in Physica C (in press). Donetsk Physico-Technical Institute, Ukrainian Academy of Sciences, R. Luxemburg 72, 340114 Donetsk, UKRAINE; e-mail dyakonov@host.dipt.donetsk.ua. Key words: NdBa2Cu3O6.67, pressure effect, oxygen ordering superconducting transition, charge redistribution. 74.72.Jt; 74.10.+v; 74.62.-c; 74.62.Fj; 74.25.Ha; 74.40.+k.

J. Elly, M. G. Medici, A. Gilabert, F. Schmidl, P. Seidel, A. Hoffmann, and Ivan K. Schuller, "Effect of Light Irradiation on Fiske Resonances and Josephson Effect in High-Tc Junctions." Submitted to Phys. Rev. B. Contact A. Hoffmann, Department of Physics 0350, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0350; e-mail hoffmann@ucsd.edu.

A. Endo and Y. Shiohara, "Preferred Orientation of Y2BaCuO5 Particles Entrapped by Melt-Textured YBa2Cu3O7-d Crystals." To be published in Physica C (in press). Superconductivity Research Laboratory, International Superconductivity Technology Center (ISTEC), 10-13 Shinonome 1-chome, Koto-ku, Tokyo 135, JAPAN; telefax +81 3 3536- 5714. Key words: YBCO superconductor, undercooling method, pushing, entrapment.

Akira Enokihara and Kentaro Setsune, "1.5 GHz High-Tc Superconducting Microstrip Bandpass Filter of Miniaturized Configuration." To be published in J. Supercond. Central Research Laboratories, Matsushita Electric Industrial Co., Ltd., 3-4 Hikaridai, Seika-cho, Soraku-gun, Kyoto-fu 619-02, JAPAN; telephone +81 7749 8 2514; telefax +81 7749 8 2585; e-mail enoki@crl.mei.co.jp. Key words: high-Tc superconductor, filter, miniaturized hairpin resonator, microstrip, miniaturization.

M. V. Eremin and O. V. Lavizina, "A Unified Picture for Electric Field Gradients at the Cu, O and Tm Positions in ReBa2Cu3O7-d." To be published in JETP. Kazan State University, 420008 Kazan, Tatarstan, RUSSIA; e-mail mikhail.eremin@ksu.ru.

M. R. Eskildsen, P. L. Gammel, B. P. Barber, A. P. Ramirez, D. J. Bishop, N. H. Andersen, K. Mortensen, C. A. Bolle, C. M. Lieber, and P. C. Canfield, "Structural Stability of the Square Flux Line Lattice in YNi2B2C and LuNi2B2C Studied with Small Angle Neutron Scattering." Submitted to Phys. Rev. Lett. Department of Solid State Physics, Riso National Laboratory, P.O. Box 49, DK-4000 Roskilde, DENMARK; telephone +45 46 77 46 77; telefax +45 42 37 01 15. 74.60.Ge.

E. Faulques, C. Girault, S. Lefrant, C. Lenoir, P. Batail, P. Molinie, and J. P. Buisson, "Temperature Dependence and Isotopic Shifts of the Vibrational Spectra in beta-(BEDT-TTF)2I3 Organic Superconductors." To be published in Cond. Mat. and Mater. Commun. Laboratoire de Physique Cristalline, Institut des Materiaux de Nantes, 2 rue de la Houssiniere, F-44072 Nantes, FRANCE. 74.70.Kn; 74.25.Kc; 74.25.Jb.

M. Fogelstroem, D. Rainer, and J. A. Sauls, "Tunneling into Current- Carrying Surface States of High-Tc Superconductors." Submitted to Phys. Rev. Lett. Department of Physics and Astronomy, Northwestern University, Evanston, IL 60208; J. A. Sauls' telephone (708) 491- 8624; e-mail sauls@snowmass.phys.nwu.edu.

K. Fujinami, H. Suematsu, M. Karppinen, and H. Yamauchi, "Ca Doping Effect on Superconductivity in (Yb1-xCax)(Ba0.8Sr0.2)2Cu3O6+z." To be published in Mater. Sci. Eng. B: Proc. of the 3rd Int. Symp. on Oxide Electronics, Tokyo, Japan, Dec. 18-20, 1996. Contact H. Yamauchi, Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226, JAPAN; telephone +81 45 924 5315; telefax +81 45 921 6953; e-mail yamauchi@materia.titech.ac.jp. Key words: (Yb1- xCax)(Ba0.8Sr0.2)2Cu3O6+z, superconductivity, Ca doping, Tc, hole doping mechanisms.

Yasutaka Fuwa and Keiichi Ogawa, "Enhancement of T_[irr] and DeltaM(H) in Bi2Sr2CaCu2Ox in the Presence of Ni Particles." To be published in Physica C (in press). Integrated Science, Yokohama City University, Seto 22-2, Kanazawa-ku, Yokohama, Kanagawa 236, JAPAN; telefax +81 45 787 2338; e-mail fuway@yokohama-cu.ac.jp. Key words: ferromagnetic particle, flux pinning, irreversibility line, magnetization, mixed state. 74.25.Ha; 74.60.Ge; 74.62.Yb; 74.72.Hs.

J. C. Gallop, A. Cowie, and L. F. Cohen, "Variation in Microwave Losses Induced by dc and rf Magnetic Fields in HTS Thin Films." To be published in Physica C: the Proc. of the 5th Int. Conf. on Mater. and Mech. of Supercond. -- High-Temp. Supercond. (M^2S-HTSC V), Beijing, People's Republic of China, Feb. 28-Mar. 4, 1997. U.K. Quantum Metrology Division, National Physical Laboratory, Teddington, Middlesex TW11 0LW, UNITED KINGDOM.

John Gallop, Ling Hao, and Farhat Abbas, "Spatially Resolved Measurements of HTS Microwave Surface Impedance." U.K. Quantum Metrology Division, National Physical Laboratory, Teddington, Middlesex TW11 0LW, UNITED KINGDOM.

Q. Gan, R. A. Rao, and C. B. Eom, "Control of Growth and Domain Structure of Epitaxial SrRuO3 Thin Films by Vicinal (001) SrTiO3 Substrates." To be published in Appl. Phys. Lett. Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708-0300; C. B. Eom's telephone (919) 660-5329; telefax (919) 660-8963; eom@acpub.duke.edu.

P. Gautier-Picard, E. Beaugnon, and R. Tournier, "In-situ YBa2Cu3Ox Growth Rate Analysis." To be published in Physica C (in press). Centre National de la Recherche Scientifique "Elaboration par Procedes Magnetiques" MATFORMAG, BP 166, F-38042 Grenoble Cedex 09, FRANCE; telefax +33 4 7688 1280; e-mail gpp@labs.polycnrs-gre.fr. Key words: synthesis of YBa2Cu3Ox, single-crystal growth, grain alignment (texturing). 81.10.Fq; 81.30.Fb.

A. A. Gippius, E. V. Antipov, W. Hoffmann, and K. Lueders, "Nuclear Quadrupole Interactions and Charge Localization in HgBa2CuO4+d with Different Oxygen Content." To be published in Physica C (in press). Moscow State University, 119899 Moscow, RUSSIA.

J. Glaser, A. Ehmann, B. Seling, S. Loesch, P. Zoller, W. Wischert, S. Kemmler-Sack, J. Linhart, and W. Reimers, "Substitution and Magnetic Properties of Pb-1212." To be published in Physica C (in press). Contact S. Kemmler-Sack, Institut fuer Anorganische Chemie der Universitaet Tuebingen, Auf der Morgenstelle 18, D-72076 Tuebingen, GERMANY.

T. Goto, "Partial Melting of F-Doped HgxBa2Ca2Cu3Re0.2Oy Filament." To be published in Physica C: the Proc. of the 5th Int. Conf. on Mater. and Mech. of Supercond. -- High-Temp. Supercond. (M^2S-HTSC V), Beijing, People's Republic of China, Feb. 28-Mar. 4, 1997. Department of Materials Science and Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466, JAPAN.

Tomoko Goto and Hironori Kurose, "Effect of Ambient Atmosphere on Partial-Melting of Long Y123 Superconducting Filament by Solution Spinning." Presented at Int. Workshop on Critical Currents in Supercond. for Practical Appl. (SPA '97), Xi'an, People's Republic of China, March 6-8, 1997. Department of Materials Science and Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466, JAPAN.

X. Granados, R. Yu, B. Martinez, S. Pinol, F. Sandiumenge, N. Vilalta, M. Carrera, V. Gomis, and X. Obradors, "Fabrication and Microstructural Control of High Current ReBa2Cu3O7 Current Leads (Re=Y, Nd, Sm)." Presented at the Appl. Supercond. Conf. (ASC'96), Pittsburgh, Pa., Aug. 25-30, 1996; to be published in IEEE Trans. Appl. Supercond. Institut de Ciencia de Materials de Barcelona (CSIC), Campus Universitat Autonoma de Barcelona, E-08193 Bellaterra, Catalunya, SPAIN; X. Obradors' telephone +34 3 5801853; telefax +34 3 5805729; e-mail xavier.obradors@icmab.es.

I. Grekhov, M. Baydakova, V. Borevich, V. Davydov, L. Delimova, I. Liniichuk, and A. Lyublinsky, "A New Buffer Layer for High-Quality HTSC Ultrathin Film Fabrication." To be published in Physica C (in press). Ioffe Institute, Russian Academy of Sciences, 26 Polyteknicheskaya, St. Petersburg 194021, RUSSIA. Key words: HTSC ultrathin film, buffer layer.

J. D. Guo, G. C. Xiong, D. P. Yu, Q. R. Feng, X. L. Xu, G. J. Lian, and Z. H. Hu, "Preparation of Superconducting HgBa2CaCu2Ox Films with a Zero-Resistance Transition Temperature of 121 K." To be published in Physica C (in press). Department of Physics, Peking University, Beijing 100871, PEOPLE'S REPUBLIC OF CHINA.

H. Hancotte, R. Deltour, D. N. Davydov, A.G.M. Jansen, and P. Wyder, "Superconducting Order Parameter in Partially Substituted Bi2Sr2CaCu2O8+x Single Crystals as Measured by the Tunneling Effect." To be published in Phys. Rev. B (in press). Service de Physique des Solides, Universite Libre de Bruxelles, Campus Plaine CP 233, Boulevard du Triomphe, B-1050 Bruxelles, BELGIUM; R. Deltour's telephone +32 2 650 5752; telefax +32 2 650 5916; e-mail rdeltour@ulb.ac.be. 74.72.Hs; 74.80.Fp; 74.62.Dh; 73.40.Gk.

H. Haneda, T. Ishiguro, S. Watauchi, J. Shimoyama, and K. Kishio, "rf Response of Along-Plane Vortices in Bi2Sr2CaCu2Oy." Submitted to the Proc. of the 5th Int. Conf. on Mater. and Mech. of Supercond. -- High-Temp. Supercond. (M^2S-HTSC V), Beijing, People's Republic of China, Feb. 28-Mar. 4, 1997. Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-01, JAPAN; e-mail haneda@ss.scphys.kyoto-u.ac.jp.

M. K. Hasan and J. S. Kouvel, "Vortex Flux Creep in Polycrystalline YBCO Following Rotations in Magnetic Fields." To be published in Physica C (in press). Contact J. S. Kouvel, Department of Physics, University of Illinois, Chicago, IL 60607-7059; telefax (312) 996- 9016.

W. Henderson, E. Y. Andrei, M. J. Higgins, and S. Bhattacharya, "ac Dynamics and Metastability of a Flux-Line Lattice." Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08855. 74.60.Ge; 74.60.Jg; 74.60.Ec.

S. Hensen, G. Mueller, C. T. Rieck, and K. Scharnberg, "In-Plane Surface Impedance of Epitaxial YBa2Cu3O7-d Films: Comparison of Experimental Data Taken at 87 GHz with d- and s-Wave Models of Superconductivity." Submitted to Phys. Rev. B. Fachbereich Physik, Universitaet Wuppertal, Gausstr. 20, D-42097 Wuppertal, GERMANY; e- mail hensen@wpos4.physik.uni-wuppertal.de. 74.25.Fy; 74.25.Nf; 74.72.Bk; 74.76.-Bz.

Igor F. Herbut, "Superconductor-Insulator Quantum Critical Point in 1+ epsilon Dimensions." Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver BC, CANADA V6T 1Z1; e-mail herbut@theory.physics.ubc.ca; preprint also available at cond-mat@xxx.lanl.gov (#9702116). 74.20.Mn.

J. Horvat, Y. C. Guo, R. Bhasale, W. G. Wang, H. K. Liu, and S. X. Dou, "Non-Exponential Decrease of Critical Current with Field in Bi- 2223/Ag Superconducting Tapes at Elevated Fields." To be published in Physica C (in press). Centre for Superconducting and Electronic Materials, University of Wollongong, Northfields Avenue, Wollongong NSW 2522, AUSTRALIA; telephone +61 42 21 4731; telefax +61 42 21 5731; e-mail jhorvat@uow.edu.au. Key words: high-temperature superconductors, bismuth-based superconductors, critical currents, flux pinning.

Jun Hu and A. H. MacDonald, "Universal Phase Diagram for Vortex States of Layered Superconductors in Strong Magnetic Fields." Submited to Phys. Rev. B. National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32306. 74.60.Ec.

Sun-Li Huang, M. R. Koblischka, K. Fossheim, T. W. Ebbesen, and T. H. Johansen, "Increased Flux Pinning in Both Pure and Carbon-Nanotube- Embedded Bi-2212 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. Department of Physics, Norwegian University of Science and Technology, N-7034 Trondheim, NORWAY; telefax +47 73 593695; e-mail sunlih@phys.ntnu.no.

Sumio Ikegawa and Yuichi Motoi, "Transport Properties of Layered Cuprate Films with Multiple Fluorite-Type Blocks (Pb-32n2 Phase) and of Pb-3212 Phase Films." To be published in Physica C: the Proc. of the 5th Int. Conf. on Mater. and Mech. of Supercond. -- High-Temp. Supercond. (M^2S-HTSC V), Beijing, People's Republic of China, Feb. 28-Mar. 4, 1997. Advanced Research Laboratory, Toshiba Corporation, 1 Komukai Toshiba-cho, Saiwai-ku, Kawasaki 210, JAPAN; telephone +81 44 549 2295; telefax +81 44 520 1801; e-mail ikegawa@arl.rdc.toshiba.co.jp.

T. Ito, H. Suematsu, H. Sakata, O. Fukunaga, M. Karppinen, and H. Yamauchi, "High-Pressure Synthesis of CuBa2Can-1CunOx (n=3,4) Superconductors Without External Oxidizing Agents." To be published in Mater. Sci. Eng. B: Proc. of the 3rd Int. Symp. on Oxide Electronics, Tokyo, Japan, Dec. 18-20, 1996. Contact H. Yamauchi, Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226, JAPAN; telephone +81 45 924 5315; telefax +81 45 921 6953; e-mail yamauchi@materia.titech.ac.jp. Key words: high-pressure synthesis, Cu-1234, BaCuO2+d, precursor.

J. D. Jorgensen, O. Chmaissem, J. L. Wagner, W. R. Jensen, B. Dabrowski, D. G. Hinks, and J. F. Mitchell, "Defects that Control the Properties of Tl- and Hg-Based Superconductors." To be published in Physica C: the Proc. of the 5th Int. Conf. on Mater. and Mech. of Supercond. -- High-Temp. Supercond. (M^2S-HTSC V), Beijing, People's Republic of China, Feb. 28-Mar. 4, 1997. Materials Science Division, Argonne National Laboratory, Bldg. 223, Argonne, IL 60439; telephone (630) 252-5513; telefax (630) 252-7777; e-mail jim_jorgensen@qmgate.anl.gov.

T. Kawahara, N. Sugiuchi, E. Komai, T. Terashima, and Y. Bando, "Hole and Electron Doping in Ultrathin Films with the Infinite Layer Structure by Electric Field Effect." To be published in Physica C (in press). Department of Physics, Kyoto University, Kyoto 606-01, JAPAN. Key words: thin films, electric resistivity, applications of high-Tc superconductors, hole concentration, electron-doped superconductor.

M. Kawano, K. Fujinami, H. Suematsu, T. Onda, M. Hayakawa, M. Karppinen, H. Ogiwara, and H. Yamauchi, "Peak Effect in Stoichiometric SmBa2Cu3Oy Samples." To be published in Mater. Sci. Eng. B: Proc. of the 3rd Int. Symp. on Oxide Electronics, Tokyo, Japan, Dec. 18-20, 1996. Contact H. Yamauchi, Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226, JAPAN; telephone +81 45 924 5315; telefax +81 45 921 6953; e-mail yamauchi@materia.titech.ac.jp. Key words: stoichiometric, SmBa2Cu3Oy, peak effect, Sm rich.

K. Kawano and A. Oota, "A Study on Self-Field Distribution in Ag- Sheathed (Bi,Pb)2Sr2Ca2Cu3Ox Monofilamentary Tape Using a Scanning Hall Sensor Magnetometry." To be published on Physica C. Contact A. Oota, Toyohashi University of Technology, Tempaku-cho, Toyohashi, Aichi 441, JAPAN; telefax +81 532 44 6732; e-mail oota@eee.tut.ac.jp. Key words: scanning Hall sensor, self fields, trapping currents, Ag- sheathed tape, Bi2223. 74.60.Jg; 74.72.Hs; 74.76.Bz; 74.60.Ge.

Hae-Young Kee and C. M. Varma, "Phonon Anomalies Induced by Superconductivity." Department of Physics, Rutgers University, Piscataway, NJ 08855-0849; e-mail hykee@physics.rutgers.edu; preprint also available at cond-mat@xxx.lanl.gov (#9611212). 74.20.-z; 74.25.Kc.

Amit Keren, Henri Alloul, Philippe Mendels, and Yohsuke Yoshinari, "NMR Study of [17]^O Transverse Relaxation in YBa2Cu3([16]^O_[1- c][17]^O_c)7." To be published in Phys. Rev. Lett. Laboratoire de Physique des Solides, URA2 CNRS, Universite Paris-Sud, F-91405 Orsay Cedex, FRANCE.

Ali E. Khalil, "Effects of Disorder on Thermopower Fluctuations in High Temperature Superconductors." Submitted to Phys. Lett. A. Physics Department, University of Bahrain, P.O. Box 32038, BAHRAIN.

K. Knizek, S. Malo, C. Michel, M. Hervieu, A. Maignan, and B. Raveau, "The 1201 Superconductors Hg1-y(VO4)y(Ba,Sr)2CuO4-2y+d: Evidence for VO4 Tetrahedra." To be published in Physica C (in press). Contact C. Michel, Laboratoire CRISMAT, CNRS, URA 1318, ISMRA/Universite de Caen, Boulevard du Marechal Juin, F-14050 Caen Cedex, FRANCE; telefax +33 31 95 1600; e-mail mater@crismat.ismra.fr. Key words: mercury superconductor, structure, solid solution, magnetic properties. 74.72.Gr; 74.25.Ha; 74.62.Bf; 74.62.Dh.

M. R. Koblischka, "Pinning Forces and Scaling 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. Department of Physics, University of Oslo, P.O. Box 1048, Blindern, N-0316 Oslo, NORWAY; telefax +47 22 856422; e-mail m.r.koblischka@fys.uio.no.

M. R. Koblischka, Sun-Li Huang, T. H. Johansen, Il. Bratsberg, and K. Fossheim, "Flux Pinning and Grain Coupling Studied by Magneto-Optical Visualization in Bi2Sr2CaCu2O8+d Ceramics." 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. Department of Physics, University of Oslo, P.O. Box 1048, Blindern, N-0316 Oslo, NORWAY; telefax +47 22 856422; e-mail m.r.koblischka@fys.uio.no.

Ioan Kosztin and Anthony J. Leggett, "Nonlocal Effects on the Magnetic Penetration Depth in d-Wave Superconductors." Submitted to Phys. Rev. Lett. Department of Physics, Loomis Laboratory of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, IL 61801-3080; telephone (217) 244-2097; telefax (217) 333-9819; e-mail kosztin@uiuc.edu; preprint also available at cond-mat@xxx.lanl.gov (#9702199). 74.25.Nf; 74.20.Fg; 74.72.Bk.

G. Kozlowski, C. Varanasi, I. Maartense, and C. E. Oberly, "Use of High Density Y2BaCuO5 Substrates in the Melt Processing of YBa2Cu3O7- x Bars with High Transport Critical Current." To be published in Physica C (in press). Wright Laboratory/POOX-2, Building 450, 2645 Fifth St. Ste. 13, Wright-Patterson AFB, OH 45433-7919; telefax (513) 476-4095.

S. Kuwata and W. Kinase, "One Dimensionality of the Modulated Structure in Pb-Doped Bi-Based High-Tc Superconductors." To be published in Physica C (in press). Faculty of Information Sciences, Hiroshima City University, Ozuka, Asaminami-ku, Hiroshima 731-31, JAPAN. Key words: modulated structure, 2D electron-hole lattice, local polarization, stripe configuation.

I. J. Lee, M. J. Naughton, G. M. Danner, and P. M. Chaikin, "Anisotropy of the Upper Critical Field in (TMTSF)2PF6." To be published in Phys. Rev. Lett. Department of Physics, State University of New York, Buffalo, NY 14260; M. J. Naughton's telephone (716) 645-2019; telefax (716) 645-2507; e-mail naughton@ acsu.buffalo.edu. 74.70.Kn; 74.60.-w; 74.60.Ec.

G. A. Levin, T. Stein, C. N. Jiang, C. C. Almasan, D. A. Gajewski, S. H. Han, and M. B. Maple, "An Improved Analysis of Resistivity from Flux Transformer Geometry." To be published in Physica C: the Proc. of the 5th Int. Conf. on Mater. and Mech. of Supercond. -- High-Temp. Supercond. (M^2S-HTSC V), Beijing, People's Republic of China, Feb. 28-Mar. 4, 1997. Contact C. C. Almasan, Department of Physics, Kent State University, Kent, OH 44242; telephone (330) 672-2402; telefax (330) 672-2959; e-mail calmasan@physics.kent.edu.

Jian-Xin Li and Chang-De Gong, "Spin Gap and Nuclear Magnetic Relaxations in the Cuprate Superconductors." To be published in Physica C (in press). National Laboratory of Solid State Microstructures, Institute for Solid Physics, Nanjing University, Nanjing 210093, PEOPLE'S REPUBLIC OF CHINA; telefax +86 25 332 6028.

S. Li, W. Gao, Q. Y. Hu, H. K. Liu, and S. X. Dou, "The Effect of Silver Sheath on Annealing Texture of (Bi,Pb)2Sr2Ca2Cu3O10+x Superconductor Tapes." To be published in Physica C (in press). Contact W. Gao, Department of Chemical and Materials Engineering, University of Auckland, Auckland, NEW ZEALAND. Key words: processing of superconductors, grain alignment (texturing), microstructures.

W. Y. Liang, "A Model for the Electronic Structure of Cuprate Superconductors." Submitted to Solid State Commun. Interdisciplinary Research Centre in Superconductivity, University of Cambridge, Madingley Road, Cambridge CB3 0HE, UNITED KINGDOM; telephone +44 1223-337077 or -337076; telefax +44 1223-337074; e-mail wyl1@hermes.cam.ac.uk.

C. W. Lin, J.-Y. Lin, H. D. Yang, T. H. Meen, H. L. Tsay, Y. C. Chen, J. C. Huang, S. R. Sheen, and M. K. Wu, "Synthesis of PrBa2Cu4O8 at Ambient Oxygen Pressure." To be published in Physica C (in press). Contact J.-Y. Lin, Department of Physics, National Sun Yat-Sen University, Kaohsiung 804, Taiwan, REPUBLIC OF CHINA; telefax +886 7 525 3709; e-mail linjy@venus.phys.nsysu.edu.tw. Key words: Cu-O chains, electrical resistivity, synthesis of PrBa2Cu4O8, structure of PrBa2Cu4O8. 74.72.-h; 74.62.Bf; 74.62.Dh.

I. L. Maksimov and V. N. Dutyshev, "Flux-Lattice Wrecking in Low- Dimensional Superconductors." Theoretical Physics Department, Nizhny Novgorod University, 23 Gagarin Avenue, Nizhny Novgorod 603600, RUSSIA.

G. M. Maksimova and I. L. Maksimov, "Nonlogarithmic Regime of the Temporal Magnetization Relaxation in Thin-Film Superconductors." Theoretical Physics Department, Nizhny Novgorod University, 23 Gagarin Avenue, Nizhny Novgorod 603600, RUSSIA.

T. A. Mamedov, M. de Llano, and T. Firat, "New Transition-Temperature Features of Layered Superconductors." To be published in Phys. Rev. B. Department of Physics Engineering, Hacettepe University, Beytepe 06532, Ankara, TURKEY; telefax +90 312 235 2550; e-mail tevfik@eti.cc.hun.edu.tr. 74.20.-z; 74.62.-c; 74.80.Dm; 74.25.Jb; 74.90.+n.

T. Manabe, I. Yamaguchi, S. Nakamura, W. Kondo, S. Mizuta, and T. Kumagai, "Carbon Dioxide Controlled Annealing Method for Preparation of YBa2Cu3O7-y Films by Dipping-Pyrolysis Process." To be published in Physica C (in press). National Institute of Materials and Chemical Research, Tsukuba, Higashi 1-1, Ibaraki 305, JAPAN; telephone +81 298 54 4556; telefax +81 298 54 4709; e-mail manabe@ccmail.nimc.go.jp. Key words: thin film, YBa2Cu3O7-y, chemical solution process, oxygen partial pressure, carbon dioxide partial pressure.

Y. Matsuo, T. Nojima, Y. Kuwasawa, E. Majkova, and S. Luby, "Current- Voltage Characteristics and Layer Coupling in Amorphous W/Si Multilayers." To be published in Physica C (in press). Department of Physics, Faculty of Science, Chiba University, 1-33 Yayoicho, Inage-ku, Chiba 263, JAPAN; telefax +81 43 290 2874; e-mail matsuo@physics.s.chiba-u.ac.jp. Key words: I-V characteristics, Kosterlitz-Thouless transition, layer coupling, amorphous W/Si multilayers. 74.40.+k.

I. I. Mazin and David Singh, "Ferromagnetic Spin Fluctuation Induced Superconductivity in Sr2RuO4." Complex Systems Theory Branch, Naval Research Laboratory, Washington, DC 20375-5320; preprint also available at cond-mat@xxx.lanl.gov (#9703068).

Alexander S. Mel'nikov, "Magnetic Field Dependence of the Density of States for Thin Films of d-Wave Superconductors." Institute for Physics of Microstructures, Russian Academy of Sciences, Nizhny Novgorod 603600, GSP-105, RUSSIA.

J. H. Miller, Jr., Z. G. Zou, J. R. Liu, Z. S. Zheng, and W. K. Chu, "Possible Evidence for d+s Pairing Symmetry in YBCO Using Tricrystal Microbridges." Preprint #97:020; submitted to the Proc. of the 5th Int. Conf. on Mater. and Mech. of Supercond. -- High-Temp. Supercond. (M^2S-HTSC V), Beijing, People's Republic of China, Feb. 28-Mar. 4, 1997. 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.

J. C. Moore, D.M.C. Hyland, C. J. Salter, C. J. Eastell, S. Fox, C.R.M. Grovenor, and M. J. Goringe, "Microstructure and Phase Development in Melt-Processed Tl-1223 Tapes." To be published in Physica C (in press). Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UNITED KINGDOM; telefax +44 1865 273764; e-mail jo.moore@materials.ox.ac.uk.

M. J. Naughton, I. J. Lee, P. M. Chaikin, and G. M. Danner, "Critical Fields and Magnetoresistance in the Molecular Superconductors (TMTSF)2X." To be published in Synthetic Metals: Proc. of Int. Conf. on Sci. and Technol. of Synthetic Metals (ICSM'96), Snowbird, Utah, July 29-Aug. 2, 1996. Departments of Physics and Chemistry, State University of New York, Buffalo, NY 14260; telephone (716) 645- 2019; telefax (716) 645-2507; e-mail naughton@ acsu.buffalo.edu. Key words: superconducting phase transitions, molecular superconductors, magnetotransport.

Kunihiko Oka, Zhigang Zou, and Toshimitsu Ito, "Crystal Growth of PrBa2Cu3O7-y." Electrotechnical Laboratory, 1-1-4, Umezono, Tsukuba 305, JAPAN.

S. Ondono-Castillo and N. Casan-Pastor, "Thermal and Mechanical Effects on the Properties of YBa2Cu3O7-d Deposits Obtained by Electrodeposition of Precursors in Presence of Cyanide." To be published in Physica C (in press). Contact N. Casan-Pastor, Institut de Ciencia de Materials de Barcelona (CSIC), Campus Universitat Autonoma de Barcelona, E-08193 Bellaterra, SPAIN; telephone +34 93 580 1853; telefax +34 93 580 5729. Key words: YBa2Cu3O7-d deposits, electrodeposition, thermal treatment, pressure effects, silver substrate.

G. K. Perkins, L. F. Cohen, A. A. Zhukov, and A. D. Caplin, "Effect of Deoxygenation on the Vortex Dynamics in RBa2Cu3O7-d High- Temperature Superconductors." To be published in Phys. Rev. B (in press). Centre for High Temperature Superconductivity, Experimental Solid State Group, Blackett Laboratory, Imperial College of Science Technology and Medicine, London SW7 2BZ, UNITED KINGDOM; telephone +44 171 594 7609; telefax +44 171 594 7580; e-mail g.perkins@ac.ic.uk. 74.60.Ge.

M. J. Qin, X. N. Xu, A. M. Sun, X. X. Yao, J. P. Zuo, and S. Z. Yang, "Magnetic Response of Disk Shaped YBa2Cu3O7-d Thin Film to a Perpendicular Magnetic Field." To be published in Physica C (in press). Department of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Center for Advanced Studies in Science and Technology of Microstructures, Nanjing 210093, PEOPLE'S REPUBLIC OF CHINA. 74.60.Jg.

C. Reichhardt, C. J. Olson, and Franco Nori, "Dynamic Phases of Vortices in Superconductors with Periodic Pinning." To be published in Phys. Rev. Lett. Department of Physics, University of Michigan, Ann Arbor, MI 48109-1120; telephone (313) 647-5552; telefax (313) 764-6843; preprint also available at cond-mat@xxx.lanl.gov (#9703021) or http://www-personal.engin.umich.edu/~nori. 74.60.Ge; 74.60.Jg.

A. I. Rykov and S. Tajima, "The ab-Plane Anisotropy of the Peak Effect in the Twin-Free YBa2Cu3O7-d Single Crystals." To be published in Adv. Supercond. IX, edited by M. Murakami and S. Nakajima (Springer-Verlag, Tokyo): Proc. 9th Int. Symp. on Supercond. (ISS'96), Sapporo, Hokkaido, Japan, Oct. 21-24, 1996. Superconductivity Research Laboratory, International Superconductivity Technology Center (ISTEC), 10-13 Shinonome 1-chome, Koto-ku, Tokyo 135, JAPAN; telephone +81 3 3536-5703 through -5705; telefax +81 3 3536-5714 or -5717. Key words: YBa2Cu3O7 single crystal, in-plane anisotropy, fishtail effect, flux creep.

S. Salem-Sugui, Jr., Ana D. Alvarenga, Osvaldo F. Schilling, and S. Sengupta, "Low Field Magnetic Relaxation Study of a YBa2Cu3Ox Single Crystal with H || ab Planes." Contact Osvaldo F. Schilling, Departamento de Fisica, Universidade Federal de Santa Catarina, 88040-900, Florianopolis, Santa Catarina, BRAZIL; e-mail osvaldof@mbox1.ufsc.br.

S. Sasaki, A. Matsuda, and C. W. Chu, "[13]^C Spin-Lattice Relaxation Study on the Electronic Properties of K3C60." Preprint #97:024; to be published in Physica C. Matsuda-Group, 4S-322S, NTT Basic Research Laboratories, 3-1 Morinosato-Wakamiya, Atsugi-shi, Kanagawa 243-01, JAPAN; telephone +81 462 40 3537; telefax +81 462 70 2364; e- mail sasaki@will.brl.ntt.co.jp; 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. Key words: spin-lattice relaxation, K3C60, anisotropy, extended Korringa relation, Hebel-Slichter coherence peak.

S. Sasaki, A. Matsuda, and C. W. Chu, "Electronic Properties of K3C60 Studied by [13]^C Nuclear-Magnetic-Resonance Spectra." Preprint #97:025; to be published in Physica C. Matsuda-Group, 4S-322S, NTT Basic Research Laboratories, 3-1 Morinosato-Wakamiya, Atsugi-shi, Kanagawa 243-01, JAPAN; telephone +81 462 40 3537; telefax +81 462 70 2364; e-mail sasaki@will.brl.ntt.co.jp; 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. Key words: [13]^C-NMR spectra, K3C60, Knight shift, hyperfine coupling, band structure.

H. Schmidt and H. F. Braun, "Superconductivity, Magnetism, and Their Coexistence in R(Ni1-xCox)2B2C (R=Lu,Tm,Er,Ho,Dy)." To be published in Phys. Rev. B (in press). Physikalisches Institut, Universitaet Bayreuth, Universitaetsstrasse 30, D-95440 Bayreuth, GERMANY; telephone +49 921 55 3259; telefax +49 921 55 3647. 74.72.Ny; 74.62.Dh; 74.62.-c; 74.60.Ec.

J. Schroeder, M. Ye, J. F. de Marneffe, M. Mehbod, R. Deltour, A.G.M. Jansen, and P. Wyder, "Thermally Activated Flux Motion in YBa2(Cu1- xZnx)3O7-d Epitaxial Thin Films: Influence of Magnetic Field and Zn Doping." To be published in Physica C. Contact R. Deltour, Service de Physique des Solides, Universite Libre de Bruxelles, Campus Plaine CP 233, Boulevard du Triomphe, B-1050 Bruxelles, BELGIUM; telephone +32 2 650 5752; telefax +32 2 650 5916; e-mail rdeltour@ulb.ac.be. Key words: high-Tc superconductors, thin films, pinning. 74.60.Ge; 74.60.Jg; 74.25.Fy; 74.76.Bz.

H. Schwer, E. Kopnin, R. Molinski, J. Jun, G. I. Meijer, K. Conder, C. Rossel, and J. Karpinski, "Effect of Pb Doping on the Structure of HgBa2CuO4+d Single Crystals." To be published in Physica C (in press). Laboratorium fuer Festkoerperphysik, ETH Hoenggerberg, CH- 8093 Zurich, SWITZERLAND; telefax +41 1 633 1072. Key words: structure of Hg0.9Pb0.1Ba2CuO4+d and of HgBa2CuO4+d, oxygen stoichiometry, single crystal x-ray diffraction, defect structure, Pb doping.

Donglu Shi, Krishanu Lahiri, and D. Qu, "Surface Nucleation in Seeded-Melt Processing of YBa2Cu3Ox." Submitted to the 126th TMS Annual Meeting, Orlando, Fla., Feb. 9-13, 1997. Department of Materials Science and Engineering, University of Cincinnati, Cincinnati, OH 45211; e-mail dshi@uceng.uc.edu.

Donglu Shi, D. Qu, S. Sagar, and K. Lahiri, "Domain Orientation Dependence of Levitation Force in Seeded Melt Grown Single-Domain YBa2Cu3Ox." Submitted to Appl. Phys. Lett. Department of Materials Science and Engineering, University of Cincinnati, Cincinnati, OH 45211; e-mail dshi@uceng.uc.edu.

Okram G. Singh, B. D. Padalia, Om. Prakash, S. K. Agarwal, and A. V. Narlikar, "Possible Competitive Electron- and Hole-Like Conduction in the Revived Nd1.82Ce0.18CuOy Superconductors." To be published in Physica C (in press). Nuclear Science Centre, P.B. 10502, Aruna Asaf Ali Road, New Delhi 110067, INDIA; e-mail in Japan okram@nrim.go.jp. Key words: thermoelectric power, electron-doped superconductor, electronic structure, electronic transport.

H. Suematsu, T. Ito, H. Sakata, K. Kurashima, Y. Bando, M. Karppinen, and H. Yamauchi, "Simultaneous EDS and EELS Studies on Carbon in CuBa2Ca3Cu4Ox Superconductors." To be published in Mater. Sci. Eng. B: Proc. of the 3rd Int. Symp. on Oxide Electronics, Tokyo, Japan, Dec. 18-20, 1996. Contact H. Yamauchi, Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226, JAPAN; telephone +81 45 924 5315; telefax +81 45 921 6953; e-mail yamauchi@materia.titech.ac.jp. Key words: Cu-12(n-1)n, superconductors, EELS, TEM, chemical analysis.

Masahide Takahama, Tomoko Goto, Kazuo Watanabe, and Satoshi Awaji, "Transport Current Density up to 10 T at 77 K in Filamentary YBa2Cu3O7 Superconductor." 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. Nagoya Institute of Technology, Gokiso-cho, Showa- ku, Nagoya 466, JAPAN.

H. J. Tao, Farun Lu, and E. L. Wolf, "Observation of Pseudogap in Bi2Sr2CaCu2O8+d Single Crystals with Electron Tunneling Spectroscopy." Submitted to 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.

J. M. Tranquada, "Charge Stripes and Spin Correlations in Copper- Oxide Superconductors." Submitted to the Proc. of the 5th Int. Conf. on Mater. and Mech. of Supercond. -- High-Temp. Supercond. (M^2S-HTSC V), Beijing, People's Republic of China, Feb. 28-Mar. 4, 1997. Department of Physics, Brookhaven National Laboratory, Upton, NY 11973; telephone (516) 344-7547; telefax (516) 344-2918; e-mail jtran@bnl.gov; preprint also available at cond-mat@xxx.lanl.gov (#9702117).

G. E. Volovik, "Fermionic Entropy of the Vortex State in d-Wave Superconductors." To be published in Pis'ma ZhETF. Low Temperature Laboratory, Helsinki University of Technology, Otakaari 3A, 02150 Espoo, FINLAND; e-mail volovik@boojum.hut.fi; preprint also available at cond-mat@xxx.lanl.gov (#9702093).

J. O. Willis, R. D. Ray II, J. F. Bingert, D. S. Phillips, R. J. Beckman, M. G. Smith, R. J. Sebring, P. A. Smith, B. L. Bingham, J. Y. Coulter, and D. E. Peterson, "Processing Factors for High Critical Current Density in Bi-2223/Ag Tapes." Preprint #LA-UR-97-288; submitted to Physica C. Superconductivity Technology Center, Materials Science and Technology Division, Mail Stop K763, Los Alamos National Laboratory, Los Alamos, NM 87545; telephone (505) 665-1320; telefax (505) 665-3164; e-mail jwillis@lanl.gov. Key words: Bi- 2223/Ag tapes, critical current density, thermomechanical processing. 74.72.Hs; 74.60.Jg; 85.25.Kx; 81.40.Ef.

Hideki Yamamoto, Michio Naito, and Hisashi Sato, "A New Superconducting Cuprate Prepared by Low-Temperature Thin-Film Synthesis in a Ba-Cu-O System." To be published in Jpn. J. Appl. Phys. Matsuda Research Group, Materials Research Laboratory, NTT Basic Research Laboratories, 3-1 Wakamiya, Morinosato, Atsugi-shi, Kanagawa 243-01, JAPAN; telephone +81 462 40 3523; telefax +81 462 70 2364; e-mail hideki@will.brl.ntt.co.jp. Key words: new high-Tc cuprate, Ba-Cu-O, low-temperature synthesis, thin film, reactive coevaporation.

H. Yamauchi and M. Karppinen, "Hole-Doping of the CuO2 Planes in High Tc Superconductors." To be published in Mater. Sci. Eng. B: Proc. of the 3rd Int. Symp. on Oxide Electronics, Tokyo, Japan, Dec. 18-20, 1996. Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226, JAPAN; telephone +81 45 924 5315; telefax +81 45 921 6953; e-mail yamauchi@materia.titech.ac.jp.

X. Yao and Y. Shiohara, "Large REBCO Single Crystals: Growth Processes and Superconducting Properties." To be published in Supercond. Sci. & Technol. Morioka Laboratory, International Superconductivity Technology Center, Iwate Industrial Research Institute, 3-35-2 Iioka-Shinden, Morioka, Iwate, 020, JAPAN; telephone +81 19 635 9015; telefax +81 19 635 9017. Key words: single crystal, superconductivity, RE1Ba2Cu3O7-d crystal growth rate, crystal pulling method.

Xin Yao, Makoto Kambara, Takateru Umeda, and Yuh Shiohara, "95 K NdBCO Single Crystal Grown in Air by Controlling Liquid Composition." To be published in JJAP. Morioka Laboratory, International Superconductivity Technology Center, Iwate Industrial Research Institute, 3-35-2 Iioka-Shinden, Morioka, Iwate, 020, JAPAN; telephone +81 19 635 9015; telefax +81 19 635 9017. Key words: superconductor, Nd1+xBa2-xCu3O6+d, crystal growth, liquid composition, critical transition temperature.

A. Levy Yeyati, J. C. Cuevas, A. Lopez-Davalos, and A. Martin-Rodero, "Resonant Tunneling Through a Small Quantum Dot Coupled to Superconducting Leads." To be published in Phys. Rev. B. Departamento de Fisica Teorica de la Materia Condensada C-V, Universidad Autonoma de Madrid, E-28049 Madrid, SPAIN; e-mail aly@uamc11.fmc.uam.es; preprint also available at cond-mat@xxx.lanl.gov (#9612193). 74.50.+r; 73.40.Gk; 73.20.Dx.

Y. Yoshinari, "Anisotropy of the Knight Shift at Planar Oxygen Sites in YBa2Cu3Ox: Possible Location of the Doped Holes." To be published in Physica C (in press). Los Alamos National Laboratory, Los Alamos, NM 87545; telephone (505) 665-0364; telefax (505) 665- 7652. Key words: CuO planes, electronic structure, hole concentration, NMR.

Feng Yu, Kenneth W. White, and Ruling Meng, "Mechanical Characterization of Top-Seeded Melt-Textured YBa2Cu3O7-d Single Crystal." To be published in Physica C (in press). Texas Center for Superconductivity and Department of Mechanical Engineering, University of Houston, Houston, TX 77204-4792; telephone (713) 743- 8200; telefax (713) 743-8201; e-mail preprints@www.tcs.uh.edu. Key words: YBCO, flexural strength, fracture toughness, indentation.

R. Yu, J. Mora, S. Pinol, F. Sandiumenge, N. Vilalta, V. Gomis, B. Martinez, E. Rodriguez, J. Amoros, M. Carrera, X. Granados, D. Camacho, J. Fontcuberta, and X. Obradors, "Processing and Levitation Force in Top-Seeded YBCO." Presented at the Appl. Supercond. Conf. (ASC'96), Pittsburgh, Pa., Aug. 25-30, 1996; to be published in IEEE Trans. Appl. Supercond. Institut de Ciencia de Materials de Barcelona (CSIC), Campus Universitat Autonoma de Barcelona, E-08193 Bellaterra, Catalunya, SPAIN; X. Obradors' telephone +34 3 5801853; telefax +34 3 5805729; e-mail xavier.obradors@icmab.es.

R. Yu, J. Mora, N. Vilalta, F. Sandiumenge, V. Gomis, S. Pinol, and X. Obradors, "Effect of Melt-Processing Temperature on the Microstructure and the Levitation Force of YBCO Melt-Textured Superconductors." Institut de Ciencia de Materials de Barcelona (CSIC), Campus Universitat Autonoma de Barcelona, E-08193 Bellaterra, Catalunya, SPAIN; X. Obradors' telephone +34 3 5801853; telefax +34 3 5805729; e-mail xavier.obradors@icmab.es.

Xingjiang Zhou, M. Cardona, D. Colson, and V. Viallet, "Evidence for Multicomponent Order Parameters in the Electronic Raman Spectra of HgBa2Ca2Cu3O8+d Superconductor." Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, GERMANY; telefax +49 711 689 1010; e-mail zhou@cardix.mpi- stuttgart.mpg.de. 74.25.Gz; 74.72.Jt; 78.30.Er.

B. Y. Zhu, "Pinning, Thermal Fluctuation and Hall Effect in the Mixed State: A Numerical Study." To be published in Physica C (in press). National Laboratory of Solid State Microstructures and Institute of Solid State Physics, Department of Physics, Nanjing University, Nanjing 210093, PEOPLE'S REPUBLIC OF CHINA. 74.60.Ge; 74.60.Ec.

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

April 10, 1997: WTEC Workshop on Electronics Applications of Superconductivity in Japan, Rosslyn Westpark Hotel (Holiday Inn), Arlington, Va. Sponsored by the National Science Foundation and the Defense Advanced Research Projects Agency. For policymakers, manufacturers, or investors interested in developments in high- temperature superconductivity (HTS), workshop is an opportunity to tap the insights and conclusions of WTEC's panel of experts (chaired by John Rowell), based on recent visits to major HTS R&D sites in Japan. Speakers will also cover conventional LTS materials. Japanese and U.S. research and projects will be discussed and compared, and funding issues will be addressed. Workshop format allows for questions from the audience. To reserve a seat, contact WTEC, Loyola College, 4501 N. Charles St., Baltimore, MD 21210; telephone (410) 617-5001; telefax (410) 617-5123; e-mail williams@loyola.edu.

*July 19 - 27, 1997: 3rd International Summer School On High Temperature Superconductivity, Eger, Hungary. Objective is to provide overview of basic and up-to-date information on the theories and newest results in fundamental research and applications of high- temperature superconductors. Last days of the School to be devoted to a scientific conference (poster sessions and 15-minute oral presentations) for participants to present results of their own scientific work. Will contain oral lectures and presentations including the following topics: second decade of high-Tc superconductivity, new theories, physical properties, characterization and measurements of physical properties, new trends in preparation techniques, crystal structures, physical properties and morphology, manufacturing, and small and large-scale applications. Proceedings to be published; tutorial lectures will be published as a textbook, "Textbook of the Summer School." Official language is English. For further information contact Istvan Vajda, Department of Electrical Machines and Drives, Technical University of Budapest, Egry Jozsef utca 18, H-1111 Budapest, Hungary; telephone +36 1 463-2961 or -3600; e-mail vajda@ntb.bme.hu; Web site http://docs4.mht.bme.hu/~farkas.

*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. For preliminary information contact Davor Pavuna, telephone +41 21- 6933301; telefax +41 21-6934666; e-mail pavuna@eldp.epfl.ch.

*Sept. 7 - 20, 1997: Summer School on Superconductivity in Networks and Mesoscopic Structures, Certosa di Pontignano, Siena, Italy. Aimed at Ph.D. students and postdoctoral researchers. School will provide opportunity for interaction with experts from different fields and include topics such as simulation of complex dynamic systems, quantum and classical theories, Monte Carlo simulations, and others. Six days of lessons, with afternoons available for working groups and additional seminars. Proceedings to be published by World Scientific. Limited number of grants are available and can be requested via the Web or e-mail. Grant application deadline, April 15, 1997. Contact C. Giovannella, Dipartimento di Fisica, Universita di Roma "Tor Vergata", Via della Ricerca Scientifica 1, I-00133 Rome, Italy; telephone +39 6 7259 4524; telefax +39 6 202 3507; e-mail supnet@roma2.infn.it. Information also available at the web site http://wwwas.roma2.infn.it/.

*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.

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

Position Available: A postdoctoral position is available at Central Research Institute of Electric Power Industry (CRIEPI) in Tokyo, Japan. Requires experience in one of the following three fields: crystal growth, transport study of the normal state, or experiments on vortex dynamics. Appointments are for one year with possibility of extension up to three years. A Ph.D. in physics, materials science, or chemistry is required. Application deadline, June 15, 1997. Applicants should send a resume including a list of publications/talks to Yoichi Ando, Central Research Institute of Electric Power Industry (CRIEPI), 2-11-1 Iwato-kita, Komae, Tokyo 201, Japan; telephone +81 3 3480-2111, ext. 8438; telefax +81 3 3480- 3401; e-mail ando@criepi.denken.or.jp.

Postdoctoral Positions Available: Candidates must have strong background in physics and/or materials science for study of the superconducting properties, microstructure, and their relationship in high-Tc superconductors. Prime focus is on understanding mechanisms of current transport in bicrystal and polycrystalline high-Tc superconductors. Work is fundamental science based, but aimed at understanding and defeating the mechanisms which limit the critical current density. Research may occur across multiple groups. Two or more positions available for candidates with expertise in theoretical and experimental vortex dynamics and pinning, superconducting property characterization, transmission electron microscopy, phase transformations, grain boundaries, and possibly in processing of HTS. Ph.D. in materials science or physics required. Salary: mid to high $30s with benefits. Send CV along with the names of three referees by May 1, 1997. Contact David C. Larbalestier, Director, Applied Superconductivity Center, Room 915, 1500 Engineering Drive, Madison, WI 53706-1687; telephone (608) 263-2194; telefax (608) 263-1087; e- mail larbales@engr.wisc.edu.

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, #7, April 1, 1997.