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, EPRI, and other agencies, organizations, and individuals.
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Pseudogap
One of the central topics under study by researchers in the field of high-temperature superconductivity is the question of the pseudogap state, which has been found to occur in underdoped cuprates below a characteristic temperature T*, a temperature that can significantly exceed the superconducting transition temperature Tc.
Three reviews listed in this issue focus on experiment and theory related to the pseudogap state. A preprint by C. Berthier et al. (Grenoble) reviews NMR and NQR studies in the normal state of high-Tc superconducting cuprates. The authors emphasize that such techniques have resulted in three major contributions: the observation of antiferromagnetic fluctuations, the possible justification of a singlespin-fluid model, and the opening of the pseudogap in the spin excitations for underdoped compounds. The authors give a quantitative analysis of the nuclear relaxation for [63]^Cu, [89]^Y, and [17]^O nuclei, compare the results with inelastic neutron-scattering data, and point out a serious difficulty with the one-band approach (159 refs.).
A preprint by A. V. Puchkov (McMaster) et al. reports on studies of the electromagnetic response of three different families of high-Tc superconductors [YBa2Cu3O7-d and YBa2Cu4O8 (Y-123 and Y-124), Bi2Sr2CaCu2O8+d (Bi-2212), and Tl2Ba2CuO6+d (Tl-2201)], which together allowed the authors to cover the entire doping range from under- to overdoped. The authors explored the evolution of the pseudogap response by changing the doping level, by varying the temperature from above to below T*, or by introducing impurities in the underdoped compounds. A memory-function analysis of the ab-plane optical data revealed the effect of the pseudogap most clearly. The authors compare their infrared data with other experimental results, including c-axis optical response, dc transport, and angular-resolved photoemission (107 refs.).
A review by J. R. Cooper and J. W. Loram (IRC, Cambridge) discusses some systematic patterns in the normal-state electronic properties of high-Tc oxide superconductors. The authors note that high-resolution specificheat measurements and static magnetic-susceptibility data yield important information about the effects of hole doping and zinc substitution on low-energy electronic excitations. The authors correlate this information with systematic changes observed in the electrical resistivity, Hall coefficient, and thermoelectric power, for which a new scaling property is reported (74 refs.).
Ru Oxides
Anomalous magnetic and superconducting properties have been observed by M. K. Wu (National Tsing Hua) et al. in the Ru-based double perovskite Sr2Y(Ru1-xCux)O6. The parent compound is an antiferromagnetic insulator with Neel temperature ~26 K. The authors found, however, that partially substituting Ru with Cu increases the conductivity drastically and eventually leads to superconductivity. According to the authors, the data strongly suggest that superconductivity with Tc ~ 50 K exists in a Ru-based compound that contains no CuO2 planes. The Sr2Y(Ru1-xCux)O6 compound also shows evidence of coexisting ferromagnetic order, antiferromagnetic order, and superconductivity.
SrRuO3 is a metallic ferromagnet below 160 K, but CaRuO3 does not exhibit any magnetic ordering at low temperatures, despite nearly identical structural and transport properties. Both these materials have been used to make multilayers with YBa2Cu3O7-d to study the effect of ferromagnetism on Josephson junctions and on the proximity coupling of vortices. A preprint by L. Mieville (Stanford) et al. reports on the growth and properties of (Sr1-xCax)RuO3 and Sr(Ru1-xTix)O3 thin films grown by laser ablation on (100) LaAlO3 substrates. A submonolayer sequential deposition process was used, which resulted in homogeneous films. The authors found that the two types of substitution resulted in very different magnetic and transport properties. IBAD
A preprint by F. Garcia-Moreno (Goettingen) et al. reports the achievement of a critical current density of 2 x 10^6 A/cm^2 (77 K, 0 T) in YBa2Cu3O7-d (YBCO) films of thickness 600-800 nm deposited on thin (125 micrometers) Ni foils covered with an ion-beam-assisted-deposition (IBAD) YSZ buffer layer. A dc method and an inductive ac method based on magnetic shielding yielded the same Jc. By bending the Ni foils, the authors found that Jc increased (by up to a factor of two) under compressive strain but remained constant under tension, with reversible behavior for strains between -0.4% and +0.4%.
The authors also found that there is a thickness threshold of 200-400 nm, interpreted by the authors in terms of a "dead layer," which appears at the initial stages of YBCO film growth and does not possess a high Jc. High-resolution TEM analysis confirmed that in the nucleation stages of growth, misoriented crystallites appear at the buffered substrate surface, but that during further YBCO film growth these unfavorably oriented grains are overgrown by YBCO with a high degree of in-plane orientation. The authors thus suggest that the true critical current densities carried by the top part of the YBCO film with a higher microstructural perfection are in the range of (3-4) x 10^6 A/cm^2 at 77 K and 0 T.
d-Wave Superconductivity
As shown by H. Hilgenkamp and J. Mannhart (IBM-Zurich), a boundary with a depressed order parameter is intrinsically created at the interface between two d_[x^2-y^2]-wave superconductors that form a contact at a tilt angle. The authors note that the contact is either a weak link or a Josephson junction, with properties determined by the misalignment angle.
The standard Abrikosov-Gor'kov (AG) theory of Tc in disordered d-wave superconductors breaks down in short-coherence-length high-Tc cuprates, according to a preprint by M. Franz (Johns Hopkins) et al. Their numerical calculations within the Bogoliubov-de Gennes formalism demonstrate that the correct description of such systems must allow for the spatial variation of the order parameter, which is strongly suppressed in the vicinity of impurities but is mostly unaffected elsewhere. The authors find that the suppression of Tc, as measured with respect to the corresponding decrease in the superfluid density, is weaker than that predicted by the AG theory, in good agreement with experiment.
A theory of nonmagnetic impurities in an anisotropic superconductor including the effect of anisotropic (momentum-dependent) impurity scattering is given in a preprint by G. Haran and A.D.S. Nagi (Waterloo). The authors find that for strongly anisotropic scattering the reduction of the pair-breaking effect of the impurities is large.
The electronic thermal conductivity in a d-wave superconductor, including both the effect of impurity scattering and inelastic scattering by antiferromagnetic spin fluctuations, has been calculated by P. J. Hirschfeld (Florida) and W. O. Putikka (Cincinnati). The authors analyze existing experiments, particularly with regard to the question of the relative importance of electronic and phononic contributions to the heat current, and to the influence of disorder on low-temperature properties. The authors find that phonons dominate heat transport near Tc, but that electrons are responsible for most of the peak observed in clean samples.
A preprint by H. Houssa (Liege) et al. reports a calculation of the magnetic-field dependence of the electrothermal conductivity P of highTc superconductors with either s-wave or d-wave gap parameters. The authors analyze the field dependence of P in Bi2Sr2CaCu2O8+d (Bi-2212), (Bi,Pb)2Sr2Ca2Cu3O10+d [(Bi,Pb)-2223], and Tl2Ba2CaCu2O8+d (Tl-2212) and conclude that the observed behavior excludes s-wave symmetry but is consistent with a d_[x^2-y^2]-wave gap parameter.
YBa2Cu3O7-d
A systematic investigation of dynamical fluctuation effects in the frequency-dependent microwave conductivity (45 MHz - 45 GHz) of YBa2Cu3O7-d thin films for T >= Tc has been carried out by J. C. Booth (Maryland) et al. The measurements directly yield the fluctuation lifetime tau^[fl] and a dynamical critical exponent z in the range 2.33.0, diverging more quickly than the gaussian-theory prediction (z = 2) as the temperature approaches Tc from above. In addition, both the temperature and frequency dependence of the fluctuation conductivity sigma^[fl] exhibit scaling behavior for temperatures 1-2 K above Tc, and can be collapsed onto a universal curve that is the same for all samples, independent of the degree of oxygen disorder in the material.
A paper by C. J. Stevens (Oxford) et al. reports the use of femtosecond time-resolved spectroscopy to investigate electronic excitations contributing to the superconducting pair potential Delta(omega,T) in YBa2Cu3O7-d. The optical response is strongly peaked at 1.5 eV and contains two distinct components, one with a characteristic relaxation time of ~5 ps, whose amplitude displays a two-fluid-like temperature dependence, and a long-lived component (> 10 ns), which is consistent with localized quasiparticle states at the Fermi energy. The latter component shows activated behavior below Tc with an activation energy 2Delta_0 ~~ 3.5 k_BTc.
The preparation of bulk Nd1+xBa2Cu3O7-d by partial melting in air is reported by L. Dimesso (Darmstadt and Parma). The best results (zeroresistance Tc = 88 K and onset Tc = 94 K) were obtained starting with the stoichiometric composition (x = 0) and annealing at 970^oC for 24 h and cooling to room temperature at 80^oC/h.
A preprint by A. K. Pradhan et al. (SRL-ISTEC) reports magnetotransport and magnetization studies of Nd1+xBa2-xCu3O7-d single crystals grown by the traveling-solvent floating-zone technique in an Ar atmosphere containing 0.1% O2. The authors discuss the pinning centers that are responsible for the strong pinning and enhanced irreversibility line in these materials.
Bi Cuprates
Single crystals of (Bi,Pb)2Sr2Ca2Cu3O10+d have been grown by S. Chu and M. E. McHenry (Carnegie Mellon) using a fused-salt reaction of Bi2O3, PbO, SrCl2, CaCl2, CuCl, and KNO3 in a KCl flux. Typical dimensions of the plate-like crystals are 0.1 mm x 0.1 mm with a thickness of 1-10 micrometers. The magnetization of randomly oriented single crystals at low field follows a sharp superconducting transition with an onset temperature of 110 K.
Measurements by P. N. Mikheenko et al. (Wollongong) of curves of the ac susceptibility chi" versus temperature of Bi2Sr2Ca2Cu3O10+d tapes at different applied magnetic fields reveal a crossing point at which the ac losses are the same. The authors propose an explanation in terms of the suppression of interlayer Josephson coupling.
Angle-dependent magnetization measurements have been carried out by A. K. Pradhan (Indore) et al. to investigate the role of grain boundaries on the flux-line lattice of high-quality Bi2Sr2CaCu2O8+d (Bi-2212) single crystals. The authors also report results in crystals containing columnar defects produced by irradiation with 200 MeV Ag ions.
Other Cuprates
Low-energy electronic Raman scattering from Tl2Ba2CuO6+d (Tl-2201) single crystals with Tc = 25 K and 85 K has been studied by M. Kang (Illinois-Urbana) et al. using excitation energies from 1.65 eV to 3.05 eV. The B_[1g] 2Delta peak position shows that 2Delta/k_BTc decreases as the doping level increases. The resonance profiles of the 2Delta peak and the continuum show similar and strong resonances towards the 3.4 eV optical absorption peak in both crystals, indicating that (a) the 2Delta peak and the continuum are coupled to light scattering by the same mechanism and (b) the light-scattering mechanism for both features involves the 3.4 eV optical absorption process.
The superconducting transition temperature Tc of HgBa2Can-1CunO2n+2+d [Hg-12(n-1)n] with n = 4 and 5 has been studied by X. D. Qiu et al. (TCSUH) using quasi-hydrostatic pressure up to 16 GPa. The applied pressure shifts Tc upward in both cases, but the Tc enhancement under pressure for these compounds is significantly smaller than the previously reported universal Tc enhancements for the n = 1, 2, and 3 members of this series.
A preprint by X. Chen et al. (Zhejiang U., Hangzhou) presents a model for the oxygen-content dependence of the anisotropic compressibility and Tc for the HgBa2CuO4+d (Hg-1201) system. The calculated results for the pressure variation of Tc near optimum doping are in good agreement with experiment.
Borocarbides
Neutron-diffraction measurements have been carried out by J. W. Lynn (NIST and Maryland) et al. to investigate the crystal structure, magnetic structures, and magnetic phase transitions in RNi2B2C (R = Y, Ce, Pr, Nd, Tb, Dy, Ho, Er, Tm, and Yb). The materials that order magnetically exhibit a wide variety of both commensurate and incommensurate magnetic structures, which suggests that the dominant exchange interactions are of the indirect RKKY type.
Vortices
As shown by G. Blatter (ETH-Zurich) and V. Geshkenbein (ETH-Zurich and Landau Institute), in anisotropic and layered superconductors the fluctuation of vortex lines produces an attractive long-range vortexvortex interaction of the van der Waals type. This attraction, which follows from the anisotropic screening properties of the material, has a dramatic influence on the low-field phase diagram of these materials.
Measurements by E. F. Righi (Bariloche) et al. of the in- and out-ofplane resistivities rho_[ab] and rho_c of untwinned YBa2Cu3O7-d show that at the melting temperature of the vortex lattice T_m(H), the c-axis vortex correlation length drops to a finite value, demonstrating that melting does not coincide with a decoupling transition. The authors show that the vortex liquid just above T_m(H) has a correlation length in the field direction of the order of 1 micrometer. At higher temperatures, this correlation length decreases rapidly, making a crossover to a decoupled regime below the superconducting transition temperature Tc.
Simulations of the anisotropic uniformly frustrated 3D XY model, as a model for vortex-line fluctuations in high-Tc superconductors, have been carried out by T. Chen and S. Teitel (Rochester). The authors compute the phase diagram as a function of temperature and anisotropy for a fixed applied magnetic field B. The authors find that superconducting coherence parallel to B persists into the vortex-line-liquid state, vanishing at a T_[cz] above the melting temperature T_m.
A preprint by R. Giamarchi (Paris-Sud) and P. Le Doussal (Ecole Normale Superieure) reviews the authors' earlier prediction that the phase diagram of type-II superconductors consists of a topologically ordered Bragg glass phase at low fields, undergoing a transition at higher fields into a vortex glass or pinned liquid. The authors estimate the position of the phase boundary using a Lindemann criterion. They also find that the proposed phenomenology is compatible with recent experiments.
A preprint by R. Ikeda (Kyoto) discusses the vortex-glass transition, taking pinning into account. The author proposes possible magnetic phase diagrams for type-II superconductors.
Measurements of the pinning and magnetic-field dependence of the mixedstate Hall conductivity sigma_[xy] in thin films of two superconductors, amorphous Mo3Se and YBa2Cu3O7-d, have been carried out by A. W. Smith (Maryland) et al. In both superconductors, sigma_[xy] was found to be independent of J and therefore of pinning. The magnetic-field dependence of sigma_[xy] at large and small magnetic fields supports calculations based on time-dependent Ginzburg-Landau theory. The authors also report that sample inhomogeneities can cause a fictitious current dependence of sigma_[xy].
A method that solves the Ginzburg-Landau equations for the ideal Abrikosov lattice in type-II superconductors with high precision for arbitrary induction, Ginzburg-Landau parameter, and vortex-lattice symmetry has been developed by E. H. Brandt (MPI-Stuttgart). This iteration procedure improves upon previous one-dimensional circular-cell methods and approximate variational methods, and is easily adapted to anisotropic and unconventional superconductors. The author presents selected results for the order parameter, form factors of the periodic magnetic field measurable by neutron scattering, reversible magnetization curves, and shear modulus of the vortex lattice, which could not be obtained by previous methods.
Theory
The decay rate of metastable states is determined at high temperatures by thermal activation, but at low temperatures this may occur by quantum tunneling. This problem has been addressed by D. A. Gorokhov (ETHZurich and Ioffe Institute) and G. Blatter (ETH-Zurich), who show that if the oscillation period of the tunneling system in imaginary time is not a monotonic function of energy, at least one first-order transition takes place. The authors apply their results to the study of a massive driven string trapped in either a periodic potential or a columnar defect.
Papers by Y.-J. Kim (Purdue) use two real-space formalisms (Bogoliubovde Gennes and Eilenberger-Ambegaokar) to investigate superconductivity in inhomogeneous superconductors.
Using a BCS-like mean-field approach to the extended Hubbard model, G.G.N. Angilella et al. (Catania) obtain the dependence of Tc on the hole content per CuO2 unit and find results in agreement with experiment. The authors evaluate Tc at high pressures accounting for the pressure dependence of the tight-binding band and the carrier concentration.
A preprint by A. A. Abrikosov (Argonne) reports the derivation of Ginzburg-Landau-type equations describing a model of tetragonal hightemperature-superconducting cuprates based on the dominant role of extended saddle-point singularities in the electron spectrum and the assumption that the interaction consists of a strong long-range phononmediated attraction and a weak short-range repulsion. The connection between CuO2 layers is assumed to be established by resonant tunneling. The author calculates the temperature dependence of the upper critical field along the c axis and finds it to have positive curvature, as observed in some experiments.
Instabilities occurring in an electron system whose Fermi surface has flat regions on opposite sides have been studied by A. T. Zheleznyak (Maryland) et al. Such a Fermi surface resembles that in some high-Tc superconductors. For the repulsive Hubbard interaction, the authors find that the antiferromagnetic (spin-density-wave) instability dominates, but when the Fermi surface is not perfectly flat, the d-wave superconducting instability takes over.
Thin Films
A preprint by I. von Lampe (TU-Berlin) et al. reports the use of a polymer metal precursor for the preparation of Bi2Sr2CaCu2O8+d (Bi-2212) and Bi2Sr2Ca2Cu3O10+d (Bi-2223) films, and the patterning of such films using ultraviolet radiation. The transformation of the patterned films was carried out by an annealing process.
Using a 5 GHz parallel-plate resonator, L. F. Cohen (Imperial) et al. have studied several Gd-123 films and one Tl-2212 film as a function of microwave power. The authors report that the variation of the surface resistance as a function of dc magnetic field applied parallel to the crystallographic c axis reflects the gross microstructure of the films.
Applications
The use of high-Tc-superconducting (HTS) coils in electromagnetic actuators for control applications has been studied experimentally by R. Goodall (Lougborough) et al., with an emphasis on iron-cored suspension magnets for magnetically levitated (Maglev) vehicles. The authors demonstrate that controlled HTS magnets can be used at 77 K to provide electromagnetic levitation without power consumption. Preliminary systems studies show that there are potentially significant benefits: about 50% reduction in the weight of the magnets, very large reductions in the size of the power amplifiers that drive the magnets, and similar reductions in the power consumed by the suspension.
High trapped fields in bulk melt-textured YBa2Cu3O7-d samples with single grains of diameter about 24 mm, obtained using SmBa2Cu3O7-d seed crystals, are reported by G. Fuchs et al. (Dresden). The maximum trapped field B_0 in the gap between two samples was investigated as a function of temperature. B_0 increased from 1 T at 77 K to 8.5 T at 51.5 K, which the authors claim is the highest trapped field achieved in nonirradiated samples. At lower temperatures, cracking of the samples was observed under magnetic pressure. In this temperature range, the trapped field is limited by the mechanical strength of the samples, for which a value of 25 MPa was estimated.
Other Activities
The preparation and characterization of the compounds Sr2CuO2F2+x, Sr2CuO2Cl2:F, YBa2Cu3O7:F, and YBa2Cu4O8:F, synthesized by a new, lowtemperature fluorination procedure involving HF vapors from NH4HF2, are reported by B. N. Wani et al. (Iowa State, Ames Lab).
Superconductivity with Tc = 17.4 K in the fullerene-based chargetransfer salt TDAE-C60, coexisting with a magnetic phase, is reported by M. Ricco (Parma) et al. A large Meissner fraction appears only when the compound is slowly cooled through temperatures corresponding to (partial) freezing of the molecular rotations.
The effect of dimensionality on the superconducting fluctuations in Tl2Ba2CaCu2O8+d (Tl-2212), YBa2Cu3O7-d (YBCO), and (Tl,Bi)Ba2Ca1Cu2O7 [(Tl,Bi)-1212] has been studied by A. Wahl (Tours) et al. by measuring the fluctuation magnetization and conductivity. The authors found that the most anisotropic compound, Tl-2212, is clearly 2D, while 3D/2D crossovers (3D near Tc and 2D at higher temperatures) are found in Tl1212 and YBCO.
A method has been developed by G. A. Levin (Kent State) for computing the resistivity tensor from measured currents and voltages in the fluxtransformer method. The author finds that a widely used algorithm is not a valid approximation, even in the limit of large anisotropy.
The distribution of the static magnetic-field distribution in superconducting composites of BSCCO or YBCO powders in paraffin has been measured by D. Davidov (Ecole Normale Superieure) et al. using ESR bulk probing and magnetization. The authors show that the demagnetizing factor of superconducting particles is the key parameter that determines the field variance in composites.
A paper by H. A. Blackstead (Notre Dame) and J. D. Dow (Arizona State) argue that the charge-transfer hypothesis is inconsistent with data for YBa2Cu3Ox: (a) the two-step behavior of Tc(x) with jumps from zero to ~60 K and then to ~90 K is not reflected as a similar, statistically significant two-step behavior in the bond-valence-sum charge of cuprateplane Cu ions, (b) as a consequence of the law of conservation of charge, the derivatives of the layer charges with respect to oxygen content x for both the BaO layers and the charge-reservoir CuO chains have the opposite signs to those predicted, and (c) the charge transfer observed for superconducting YBa2Cu3Ox is not sufficient to produce superconductivity, as demonstrated by insulating PrBa2Cu3Ox, which has virtually the same layer charges.
Overviews
Conductivity and superconductivity in the C60 fullerides have been reviewed by K. Tanigaki (NEC) and O. Zhou (North Carolina). The authors describe specific features of these materials in terms of their electronic properties and crystal structure (85 refs.).
The basic theoretical ideas concerning unconventional superconductors are reviewed by P. Muzikar (Purdue). These are superconductors with an order parameter that breaks the rotational symmetry of the normal-state crystals; in some cases time-reversal symmetry also is broken. The author discusses how to calculate a number of physical properties using either a Ginzburg-Landau theory or a more microscopic theory of a superfluid Fermi liquid (64 refs.).
A review by P. M. Chaikin (Princeton and Exxon) introduces readers to field-induced spin-density waves (FISDWs) in the Bechgaard salts, and discusses recent experimental results on related high-magnetic-field phenomena. The author notes that the FISDWs found in organic conductors represent a unique series of transitions that meld the one-dimensional physics of the Peierls instability with the two-dimensional physics of the quantum Hall effect (64 refs.).
A preprint by J. Karpinski (ETH-Zurich) et al. presents an overview of the phase diagram, crystal growth, and physical and structural investigations of Y2Ba4Cu6+nO14+n and HgBa2Can-1CunO2n+2+d [Hg-12(n-1)n] compounds synthesized at high pressure (47 refs.).
A brief overview by R. A. Klemm (Argonne) describes fluctuation diamagnetism and fluctuation conductivity in layered superconductors, as calculated using gaussian fluctuations. He also points out the many similarities between the properties of the layered transition-metal dichalcogenides (such as NbSe2) and the high-Tc cuprates (29 refs.).
A preprint by A. Hoffmann et al. (UC-San Diego) provides a brief review of persistent photoconductivity (PPC) and persistent photoinduced superconductivity (PPS) in RBa2Cu3O7-d (R = rare earth) thin films. PPC occurs in oxygen-deficient samples, while PPS has been observed in underdoped RBa2Cu3O7-d with oxygen contents x >= 6.4 (19 refs.).
As noted in a paper by Z.-Y. Shen et al. (DuPont), the focus of hightemperature-superconducting (HTS) microwave circuit development has shifted to high power-handling capability. The authors review progress in this area, including HTS materials improvements, new concepts in circuit design, and the latest power-filter results, emphasizing work at DuPont (9 refs.).
Contributed by John R. Clem
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.
This section describes progress in manufacturing, product development, and technology transfer in the high-Tc superconductivity field. Please send your contributions (product development information, news regarding technology transfer efforts, or any information you would like to share about your corporation or laboratory) to the editor.
A distribution agreement between Conductus, Inc., and Nalorac Corporation, a leading manufacturer and distributor of NMR probes, is announced. Nalorac is a privately held California corporation that develops, manufactures, and markets NMR probes, instrumentation, and NMR-grade superconductive magnets, as well as high-performance cryogenic dewar systems. The company plans to market the SuperProton*nmr probes developed and introduced by Conductus in March 1996, which increase sensitivity of some applications by 300% with use of the HTS technology.
In addition, Conductus has announced its first commercial shipment of the superconducting probe for use at the National High Magnetic Field Laboratory in Florida. The probe will be part of a new Varian NMR system and will allow for analysis of much smaller quantities of new products, by-products, and metabolite samples. The probe also is expected to reduce data acquisition time by a factor of 16 in some applications.
For further information, contact Duncan MacMillan, Vice President for Marketing, Conductus, Inc., 969 West Maude Ave., Sunnyvale, CA 94086; telephone (408) 523-9401; telefax (408) 523-9999.
Researchers Seek Collaboration: Magnetic systems with uniaxially symmetric fields up to 5 T and high spatial homogeneity have been developed at the Institute of Radiophysics and Electronics (IRE) of the National Academy of Sciences, Kharkov, Ukraine, using NbTi superconducting solenoids inside ferromagnetic screens. The magnets are applied in solid-state maser amplifiers and microwave spectroscopy applications (T = 1.7-4.2 K). The researchers are interested in developing similar HTS solenoid systems for ESR and FMR-spectroscopy and other applications, and would like to collaborate with groups that have successfully developed wires with the following characteristics: Jc >= 10^4 A/cm^2 (77 K), diameter ~ 0.1 mm, and length > 100 m. Contact N. T. Cherpak, Institute of Radiophysics and Electronics (IRE), National Academy of Sciences, 12 acad. Proskura str., 310085 Kharkov, Ukraine; telephone +7 572-441-105; telefax +7 572 448-363.
Contributed by Sreeparna Mitra
A. A. Abrikosov, "Ginzburg-Landau Equations for the Extended Saddle Point Model." Contact Janice Coble, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439; telefax (708) 252-9595; e-mail janice_coble@qmgate.anl.gov. 74.20.De; 74.20.Fg; 74.20.Mn; 74.25.Dw.
V. A. Alyoshin, D. A. Mikhailova, and E. V. Antipov, "Synthesis of HgBa2CuO4+d Under Controlled Mercury and Oxygen Pressures." To be published in Physica C (in press). Contact E. V. Antipov, Department of Chemistry, Moscow State University, 119899 Moscow, RUSSIA; telefax +7 095-939 4788; e-mail antipov@inorg.chem.msu.su. Key words: HgBa2CuO4+d, synthesis, mercury partial pressure, solid state-gasous phase equilibrium.
Giuseppe G. N. Angilella, Renato Pucci, and Fabio Siringo, "Interplay Among Critical Temperature, Hole-Content, and Pressure in the Cuprate Superconductors." To be published in Phys. Rev. B., Dec. 1, 1996. Dipartimento di Fisica dell'Universita di Catania, 57 Corso Italia, I95129 Catania, ITALY; telephone +39 95 7195285; telefax +39 95 383023; e-mail angilella@ct.infn.it; preprint also available at condmat@xxx.lanl.gov (#9608132). 74.25.-q; 74.62.Fj; 74.62.Dh.
R. Baquero, D. Quesada, and C. Trallero-Giner, "BCS-Universal Ratios Within the Van Hove Scenario." To be published in Physica C (in press). Departamento de Fisica, CINVESTAV, A. Postal 14-740, 07000 Mexico, D. F. MEXICO; telefax +52 5 747 7096; e-mail rafael.baquero@fis.cinvestav.mx. 74.20.Fg.
M. Basletic, D. Zanchi, B. Korin-Hamzic, A. Hamzic, S. Tomic and J. M. Fabre, "Negative Magnetoresistance in (TMTTF)2Br." Manuscript #6.1045; to be published in Schegolev Memorial Vol. of J. de Physique I. Contact B. Korin-Hamzic, Institute of Physics of the University, POB 304, HR10000 Zagreb, CROATIA; telephone +385 1-271 211 or -271 504; telefax +385 1-421 156; e-mail bhamzic@olimp.irb.hr. 74.70.Kn; 72.15.Gd.
C. Berthier, M. H. Julien. M. Horvatic, and Y. Berthier, "NMR Studies of the Normal State of High Temperature Superconductors." Manuscript #6.1147; to be published in Schegolev Memorial Vol. of J. de Physique I. Contact C. Berthier or M. Horvatic, Grenoble High Magnetic Field Laboratory, Centre National de la Recherche Scientifique and Max Planck Institut fuer Festkoerperforschung, B.P. 166X, F-38042 Grenoble Cedex 9, FRANCE; C. Berthier's telephone +33 76 51 47 57, telefax +33 76 51 45 44, e-mail berthi@grenet.fr; M. Horvatic's telephone +33 76 88 74 43, telefax +33 76 85 56 10, e-mail horvatic@labs.polycnrs-gre.fr. 74.72.h; 76.60.-k.
Howard A. Blackstead and John D. Dow, "Charge-Transfer in YBa2Cu3Ox." Submitted to J. Supercond. Department of Physics, University of Notre Dame, Notre Dame, IN 46556; telephone (219) 631-7078; telefax (219) 6315952; e-mail blackstd@rems1.phys.nd.edu. Key words: superconductivity, charge transfer, YBa2Cu3Ox. 74.20.Fg.
Gianni Blatter and Vadim Geshkenbein, "Van der Waals Attraction of Vortices in Anisotropic and Layered Superconductors." Preprint #ETHTH/96-32. Theoretische Physik, ETH-Hoenggerberg, CH-8093 Zurich, SWITZERLAND. 74.60.-w; 74.60.Ec; 74.60.Ge.
James C. Booth, Dong Ho Wu, S. B. Qadri, E. F. Skelton, M. S. Osofsky, Alberto Pique, and Steven M. Anlage, "Large Dynamical Fluctuations in the Microwave Conductivity of YBa2Cu3O7-d above Tc." To be published in Phys. Rev. Lett. Contact Steven M. Anlage, Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, MD 20742-4111; telephone (301) 405-7321; telefax (301) 405-3779; e-mail anlage@squid.umd.edu; web site http://www.csr.umd.edu. Key words: superconductors, conductivity, fluctuations, microwave properties, Corbino geometry.
G. Boettger, I. Mangelschots, E. Kaldis, P. Fischer, Ch. Krueger, and F. Fauth, "The Influence of Ca Doping on the Crystal Structure and Superconductivity of Orthorhombic YBa2Cu3O7-d ." To be published in J. Phys: Condens. Matt. Laboratory for Neutron Scattering, ETH Zurich & Paul Scherrer Institute, CH-5232 Villigen PSI, SWITZERLAND; telephone +41 56 310 20 91; telefax +41 56 310 29 39; e-mail boettger@psi.ch.
C. J. Boulter and J. O. Indekeu, "Analytic Determination of the Interface Delocalization Transition in Low-kappa Superconductors." To be published in Physica C (in press). Contact J. O. Indekeu, Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven, B-3001 Leuven, BELGIUM; telefax +32 16 327 983; email joseph.indekeu@fys.kuleuven.ac.be.
Ernst Helmut Brandt, "Precision Ginzburg-Landau Solution of Ideal Vortex Lattices for any Induction and Symmetry." Submitted to Phys. Rev. Lett. Institut fuer Physik, Max Planck Institut fuer Metallforschung, D-70506 Stuttgart, GERMANY. 74.60.Ge.
P. M. Chaikin, "Field Induced Spin Density Waves." Manuscript #6.1126; to be published in Schegolev Memorial Vol. of J. de Physique I. Department of Physics, Princeton University, Princeton, NJ 08544, telephone (609) 258-4338; telefax (609) 258-6360; e-mail chaikin@pupgg.princeton.edu. 75.30.Fv; 72.15.Gd; 74.70.Kn.
D. Chambonnet, F. Mehri, S. Degoy, P. Lederer, C. Belouet, C. Fages, D. Keller, J. C. Carru, and L. Correra, "Microwave Properties of YBa2Cu3O7d Thin Films Grown on MgO or Al2O3 Substrates." To be published in Physica C (in press). Alcatel Alsthom Recherche, UME, Route de Nozay, F-91460 Marcoussis, FRANCE; telefax +33 1 64 49 17 86; e-mail chambonn@aar.alcatel-alsthom.fr.
Tao Chen and S. Teitel, "Phase Transitions in a Model Anisotropic High Tc Superconductor." Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627; S. Teitel's e-mail stte@pas.rochester.edu; preprint also available at cond-mat@xxx.lanl.gov (#9610151).
Xiaojia Chen, Zhuan Xu, Zhengkuan Jiao, and Qirui Zhang, "The Influence of Oxygen Content on the Anisotropic Compressibility for the HgBa2CuO4+d System." Submitted to Physica C. Department of Physics, Zhejiang University, Hangzhou 310027, PEOPLE'S REPUBLIC OF CHINA.
S. Cho and D. Choi, "Microwave Properties of YBa2Cu3O7-x Resonator Under Optical and Thermal Perturbations." To be published in Physica C (in press). Optoelectronics Laboratory, University of California at Los Angeles, Los Angeles, CA 90024. Key words: irradiation effect, pair breaking, thin films.
Shaoyan Chu and Michael E. McHenry, "Growth and Characterization of (Bi,Pb)2Sr2Ca2Cu3Ox Single Crystals." Submitted to J. Mater. Res. Department of Materials Science and Engineering, Carnegie Mellon University, 5000 Forbes Ave., Pittsburgh, PA 15213; telephone (412) 2687597 or -2686; telefax (412) 268-1513; e-mail sc79@andrew.cmu.edu.
L. F. Cohen, A. Cowie, J. C. Gallop, I. S. Ghosh, and I. N. Goncharov, "Microwave Power Dependence in Gd123 and Tl2212 Thin Films: Examining the Evidence for Limiting Behavior." Submitted to J. Supercond. Blackett Laboratory, Imperial College, Prince Consort Rd., London SW7 2BZ, UNITED KINGDOM; telephone +44 171 594 7598; telefax +44 171 594 7580; e-mail l.cohen@ic.ac.uk.
J. R. Cooper and J. W. Loram, "Some Correlations Between the Thermodynamic and Transport Properties of High Tc Oxides in the Normal State." Manuscript #6.1141, to be published in Schegolev Memorial Vol. of J. de Physique I. Interdisciplinary Research Center in Superconductivity, University of Cambridge, Madingley Road, Cambridge CB3 0HE, UNITED KINGDOM; telephone +44 1223-337445 or -337076; telefax +44 1223-337074; e-mail jrc19@cus.cam.ac.uk. 74.72.-h; 74.25.Bt; 74.25.Fy.
D. E. Daney, H. J. Boenig, M. P. Maley, D. E. McMurry, and B. G. DeBlanc, "ac Loss Calorimeter for Three-Phase Cable." Preprint #LA-UR96-3183; presented at the Appl. Supercond. Conf. (ASC'96), Pittsburgh, PA, Aug. 25-30, 1996; submitted to IEEE Trans. Appl. Supercond. MSJ576, ESA-EPE, Los Alamos National Laboratory, Los Alamos, NM 87545; telephone (505) 665-0216; telefax (505) 665-7740; e-mail daney@lanl.gov.
M. A. Daugherty, J. Y. Coulter, W. L. Hults, D. E. Daney, D. D. Hill, D. E. McMurry, M. C. Martinez, L. G. Phillips, J. O. Willis, H. J. Boenig, and F. C. Prenger, "HTS High Gradient Magnetic Separation System." Preprint #LA-UR-96-2999; presented at the Appl. Supercond. Conf. (ASC'96), Pittsburgh, PA, Aug. 25-30, 1996; submitted to IEEE Trans. Appl. Supercond. MS-J576, ESA-EPE, Los Alamos National Laboratory, Los Alamos, NM 87545; telephone (505) 667-5735; telefax (505) 665-7740; email daugherty@lanl.gov.
D. Davidov, N. Bontemps, M. Golosovsky, and G. Waysand, "Magnetic Field Distribution in Superconducting Composites as Revealed by ESR-Probe and Magnetization." Submitted to Phys. Rev. B. Racah Institute of Physics, Hebrew University of Jerusalem, Jerusalem 91904, ISRAEL; M. Golosovsky's telephone +972 2 658-6551 or -5139; telefax +972 2 617-805; e-mail golos@vms.huji.ac.il. 74.80.Bj; 74.25.Ha; 74.72.Lw.
N. Dieckmann, M. Ruebhausen, A. Bock, M. Schilling, K.-O Subke, U. Merkt, and E. Holzinger-Schweiger, "Magnetic and Phononic Excitations in Y1-xPrxBa2Cu3O7 Films." Submitted to Physica C. Institut fuer Angewandte Physik und Zentrum fuer Mikrostrukturforschung, Universitaet Hamburg, Jungiusstrasse 11, 20355 Hamburg, GERMANY; telephone +37 40 41 23 42 02; telefax +37 40 41 23 43 68; e-mail dieckmann@physnet.unihamburg.de. 68.55.Jk; 74.72.Jt; 75.30.Et; 78.30.-j.
L. Dimesso, M. Marchetta, G. Calestani, A. Migliori, and M. Masini, "Preparation of the Nd-123 Phase in Air with the Tc as High as 95 K." Submitted to Supercond. Sci. & Technol. Thin Films Division, Department of Materials Science, Technical University Darmstadt, Petersenstrasse 23a, D-64287 Darmstadt, GERMANY; telephone +49 6151 16 6325; telefax +49 6151 16 6335; e-mail dimesso@hrzpub.th-darmstadt.de.
S. X. Dou, J. Horvat, X. L. Wang, M. Ionescu, H. K. Liu, I. Kusevic, and E. Babic, "Comparative Studies on Single Crystals and Superconducting Bi-(Pb)-Sr-Ca-Cu-O Tapes." Center for Superconducting and Electronic Materials, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, AUSTRALIA.
J. Elly, M.-G. Medici, A. Gilabert, F. Schmidl, S. Linzen, P. Seidel, and I. K. Schuller, "Electromagnetic Resonances in YBaCuO Bicrystal Grain Boundary Josephson Junctions." Presented at the XXI International Conference on Low Temperature Physics (LT21), Prague, Czech Republic, Aug. 8-14, 1996; to be published in Czech. J. Phys., Vol. 46 (1996). Laboratoire de Physique de la Matiere Condensee, UA 190, Universite de Nice Sophia-Antipolis, Parc Valrose, F-06108 Nice Cedex 2, FRANCE.
J. H. Eraker, "Cryogenic Nitrogen Cooling Systems for a Deployed High Temperature Superconducting Magnetic Gradiometer System." Ball Aerospace & Technologies Corp., Bldg. ADO, P.O. Box 1062, Boulder, CO 80306; telephone (303) 939-5655; telefax (303) 939-6307.
A. Fartash, "Dielectric Properties of Orientationally Ordered/Disordered C60 (111) Films." Preprint No. 96:113; submitted to Phys. Rev. B. Department of Physics and Texas Center for Superconductivity at the University of Houston, Houston, TX 77204-5932; telephone (713) 743-8200; telefax (713) 743-8201; e-mail preprints@www.tcs.uh.edu.
M. B. Field, D. C. Larbalestier, A. S. Parikh, and K. Salama, "Critical Current Properties and the Nature of the Electromagnetic Coupling in Melt-Textured YBa2Cu3O6+x Bicrystals of General Misorientation." Preprint No. 96:112; submitted to Physica C. Applied Superconductivity Center, University of Wisconsin-Madison, Madison, WI 53706; telefax (608) 263-4462; e-mail field@cae.wisc.edu. Key words: grain boundaries, weak coupling, weak links, granular superconductivity, melt texturing.
M. Franz, C. Kallin, A. J. Berlinsky, and M. I. Salkola, "Critical Temperature and Superfluid Density Suppression in Disordered High-Tc Cuprate Superconductors." Submitted to Phys. Rev. Lett. Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218; email franz@pha.jhu.edu.
G. Fuchs, G. Krabbes, P. Schaetzle, S. Gruss, P. Stoye, T. Staiger, K.H. Mueller, and L. Schultz, "High Trapped Fields in Bulk YBa2Cu3O7-d Samples at Temperatures Around 50 K." To be published in Appl. Phys. Lett. Contact T. Staiger, Institut fuer Festkoerper- und Werkstofforschung Dresden, Postfach 270016, D-01171 Dresden, GERMANY; telephone +37 351 4659-553; telefax +37 351 4659-537; e-mail t.staiger@ifw-dresden.de.
F. Garcia-Moreno, A. Usoskin, and H. C. Freyhardt, "High Critical Current Density in YBCO Films on Ni Foils." Zentrum fuer Funktionswerkstoffe gGmbH, Windausweg 2, D-37073 Goettingen, GERMANY; telephone +49 551 50 717 10; telefax +49 551 50 717 50.
T. Giamarchi and P. Le Doussal, "Phase Diagrams of Flux Lattices with Disorder." Submitted to Phys. Rev. B. Laboratoire de Physique des Solides, Universite Paris-Sud, Bat. 510, F-91405 Orsay, FRANCE; P. Le Doussal's telephone at Laboratoire de Physique Theorique de l'Ecole Normale Superieure, CNRS, Paris, FRANCE +33 1 47 07 71 46; preprint also available at cond-mat@xxx.lanl.gov (#9609112).
Roger Goodall, Colin MacLeod, Abdullah El-Abbar, Harry Jones, and Archie Campbell, "The Use of Iron-Cored HTS Magnets for EMS Maglev." Presented at 9th International Symposium on Superconductivity (ISS'96), Sapporo, Hokkaido, Japan, Oct. 21-24, 1996. Department of Electronic and Electrical Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU, UNITED KINGDOM; telephone +44 1509 228100; telefax +44 1509 222854; Abdullah El-Abbar's e-mail a.a.elabbar@lut.ac.uk. Key words: high-temperature superconductor, ironcored magnets, Maglev, control applications.
D. A. Gorokhov and G. Blatter, "Crossover from Quantum to Classical Behavior in the Decay of Metastable States." Preprint #ETH-TH/96-16. Theoretische Physik, ETH-Hoenggerberg, CH-8093 Zurich, SWITZERLAND.
F. Miletto Granozio, U. Scotti di Uccio, M. Valentino, G. G. Condorelli, I. L. Fragala, and G. Malandrino, "Morphology and Surface Properties of YBCO and TBCCO Thin Films: Influence of Etching Processes." To be published in Physica C (in press). Contact U. Scotti di Uccio, Dipartimento di Scienze Fisiche dell'Universita Federico II, Napoli, ITALY; telefax +39 81 239 1821.
Wulf Guenther and Robert Schoellhorn, "Insertion of Water into Rare Earth Oxocuprates (Ln)Ba2Cu3O7-d." To be published in Physica C (in press). Contact Robert Schoellhorn, Institut fuer Anorganische und Analytische Chemie, Technische Universitaet Berlin, Strasse des 17 Juni 135, D-10623 Berlin, GERMANY; telefax +49 30 314 22168. Key words: superconductivity, oxocuprates, intercalation.
Ernst L. Haase, "The Violation of the BCS Theory and the Extensions Required to Include the Effects of a Nearby Phase Transition." To be published in the Proc. of Phys. and Mater. Sci. in High Temp. Supercond. IV; NATO Advanced Research Workshop, Strbske Pleso, High Tatra Mountains, Slovak Republic, July 21-27, 1996. Forschungszentrum Karlsruhe, IMF III, D-76021 Karlsruhe, GERMANY; telephone +49 7247-82 2807; telefax +49 7247-82 3956; e-mail haase@imf.fzk.de.
Hideki Haneda, Takehiko Ishiguro, and Masato Murakami, "Mutual Conversion Between Ultrasonic and Electromagnetic Waves via Compressional Distortion of Vortices in a c-Axis Aligned YBa2Cu3O7." Submitted to Physica C. Department of Physics, Kyoto University, Sakyoku, Kyoto 606-01, JAPAN; telefax +81 75 753 3783; e-mail haneda@ss.scphys.kyoto-u.ac.jp. Key words: YBa2Cu3O7, ultrasonic wave, vortex pinning, Josephson vortex.
Grzegorz Haran and A.D.S. Nagi, "Role of Anisotropic Impurity Scattering in Anisotropic Superconductors." To be published in Phys. Rev. B, Vol. 54, Dec. 1, 1996. Department of Physics, University of Waterloo, Waterloo, Ontario, CANADA N2L 3G1; telephone (519) 885-1211; telefax (519) 746-8115; e-mail haran@infeld.uwaterloo.ca. 74.20.-z; 74.62.-c; 74.62.Dh.
S. K. Hasanain, Sadia Manzoor, and M. Aftab, "Peak Shifts in Magnetization Rotation Effects of Anisotropy and Pinning." To be published in Physica C (in press). Department of Physics, Quaid-i-Azam University, Islamabad 45320, PAKISTAN.
J. Hauck, "Pseudobinary Phase Diagrams of YBa2Cu3Ox and YBa2Cu4Ox ." Submitted to Supercond. Sci. & Technol. Institut fuer Festkoerperforschung, KFA Research Center, D-52425 Juelich, GERMANY. Key words: phase diagram, oxygen stoichiometry, melt texturing.
J. Hauck and S. Chernyaev, "Pseudobinary Phase Diagrams MOx with M=CaCu, SrCu or BaCu." Submitted to Supercond. Sci. & Technol. Institut fuer Festkoerperforschung, KFA Research Center, D-52425 Juelich, GERMANY. 81.30.Dz; 64.80.Eb.
H. Hilgenkamp and J. Mannhart, "Intrinsic Weak Link Originating from Tilt in Contacts Between d_[x^2-y^2] Wave Superconductors." Submitted to Appl. Phys. A. IBM Research Division, Zurich Research Laboratory Saeumerstrasse 4, CH-8803 Rueschlikon, SWITZERLAND; e-mail jhi@zurich.ibm.com. Key words: grain boundaries, Josephson junctions, order-parameter symmetry.
P. J. Hirschfeld and W. O. Putikka, "Theory of Thermal Conductivity in YBa2Cu3O7-d." Department of Physics, University of Florida, Gainesville, FL 32611; W. O. Putikka's e-mail putikka@pacific.mps.ohiostate.edu; preprint also available at cond-mat@xxx.lanl.gov (#9610152). 74.72.Bk; 74.25.Fy; 74.62.Dh.
Axel Hoffmann, Dmitry Reznik, and Ivan K. Schuller, "Persistent Photoinduced Effects in High Tc Superconductors." Submitted to Adv. Mater. Department of Physics 0350, University of California-San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0350; e-mail hoffmann@ucsd.edu.
J. Horvat, Y. C. Guo, and S. X. Dou, "Formation of Weak and Strong Links in Ag/Bi-2223 Superconducting Tapes." To be published in Physica C (in press). Center for Superconducting and Electronic Materials, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, AUSTRALIA; telefax +61 42 21 4577. Key words: critical current density, grain boundaries, weak and strong links.
M. Houssa, M. Ausloos, and M. Pekala, "Signature of the d-Wave Gap Parameter in the Field Dependence of the Electrothermal Conductivity of High-Tc Superconductors up to Tc." To be published in Phys. Rev. B. SUPRAS, Institut de Physique, B5, Universite de Liege, B-4000 Liege, BELGIUM. 74.25.Fy; 74.60.Ec; 74.72.Hs.
Tongkai Huang, Liming Yu, Yibing Zhang, Mitsuru Itoh, Jian Ding Yu, Yoshiyuki Inaguma, and Tetsuro Nakamura, "Hall Coefficient and Resistivity Measurements for Oxygen-Annealed Bi2.2Sr1.8CaCu2O8+y Single Crystals Under High Pressure." To be published in Physica C (in press). Department of Physics, Shanghai University, Shanghai 201800, CHINA; telefax +86 21 59529932. Key words: electrical resistivity, Hall effect, high pressure effect.
Ryusuke Ikeda, "Superconducting Ordering in Vortex States of Clean Type II Superconductors with Pinnings." To be published in J. Phys. Soc. Jpn., Dec. 1996. Department of Physics, Kyoto University, Kyoto 606-01, JAPAN; e-mail ikeda@ton.scphys.kyoto-u.ac.jp. Key words: vortex states, type-II superconductor, vortex-glass transition.
Valery Ivanov, "Insulator-Metal Transition in the kappa-ET2X Salts, where 'ET' is the Bis(ethylenedithio)-(tetrathiafulvalene)(BEDT-TTF) Molecule." Institute for Molecular Science, Nishigonaka 38, Myodaijicho, Okazaki 444, JAPAN; telefax +81 564 54 22 54; e-mail ivanov@ims.ac.jp. Key words: Hubbard hamiltonian; band structure, energy gap, metal-insulator transition, organic conductors.
L. Jansen and R. Block, "On the Occurrence of Plateaus in the Dependence of Critical Temperatures on Oxygen Content in HTSC Cuprates: Quantitative Analysis for Bi2Sr2CaCu2O8+x on the Basis of IndirectExchange Pairing." To be published in Physica A. Theoretische Physik, ETH-Hoenggerberg, CH-8093 Zurich, SWITZERLAND; telefax: +41 1 633 1115; e-mail jansen@itp.phys.ethz.ch.
Prafulla K. Jha and Sankar P. Sanyal, "Phonon Spectrum and Lattice Specific Heat of the HgBa2CuO4 High-Temperature Superconductor." Materials Research Laboratory, Department of Physics, University of Bhopal, Bhopal-462 026, INDIA. 63.10.+a; 63.20.Dj.
Moonsoo Kang, G. Blumberg, M. V. Klein, and N. N. Kolesnikov, "Resonance Raman Study of the Superconducting Gap and Low Energy Excitations in Tl2Ba2CuO6+d Superconductors." To be published in Phys. Rev. Lett. Department of Physics and Science and Technology Center for Superconductivity, University of Illinois at Urbana-Champaign, 1110 W. Green St., Urbana, IL 61801; telephone (217) 333-9019; telefax (217) 333-9819. 74.25.Gz; 74.72.Fq; 78.30.-j.
J. Karpinski, H. Schwer, K. Conder, J. Loehle, R. Molinski, A. Morawski, Ch. Rossel, D. Zech, and J. Hofer, "HgBa2Can-1CunO2n+2+d and Y2Ba4Cu6+nO14+n Single Crystals: High Pressure Synthesis and Properties." To be published in Lecture Notes in Physics, edited by P. Klamut (Springer-Verlag Publ., Heidelberg, Germany, 1996). Laboratorium fuer Festkoerperphysik ETH, CH-8093 Zurich, SWITZERLAND. Key words: crystal growth, high pressure, Y2Ba4Cu6+nO14+n, HgBa2Can-1CunO2n+2+d.
Yong-Jihn Kim, "A Constraint on the Anomalous Green's Function." To be published in Mod. Phys. Lett. B. Department of Physics, Korea Advanced Institute of Science and Technology, Taejon 305-701, KOREA. 74.20.-z; 74.40.+k.
Yong-Jihn Kim, "Pairing Constraint on the Real Space Formalism of the Theory of Superconductivity." To be published in the Proc. of the Inaug. Conf. of the Asia-Pacific Ctr. for Theor. Phys. (APCTP), Seoul, Korea June 4 -10, 1996 (World Scientific, 1996). Department of Physics, Korea Advanced Institute of Science and Technology, Taejon 305-701, KOREA.
Yong-Jihn Kim, "Strong Coupling Theory of Impure Superconductors: Real Space Formalism." To be published in Mod. Phys. Lett. B, Vol 10, 1996. Department of Physics, Korea Advanced Institute of Science and Technology, Taejon 305-701, KOREA. 74.20.-z; 74.40.+k.
Richard A. Klemm, "Fluctuation Phenomena in Layered Superconductors." To be published in the Proc. of the Adriatico Res. Conf. on Fluctuation Phenomena in High Temp. Supercond., edited by M. Ausloos (Kluwer, The Netherlands). Contact Janice Coble, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439; telefax (708) 252-9595; e-mail janice_coble@qmgate.anl.gov.
Hans Koch, "Matured SQUID Systems and Their Application." Presented at the Appl. Supercond. Conf. (ASC'96), Pittsburgh, PA, Aug. 25-30, 1996. Physikalisch-Technische Bundesanstalt (PTB), Abbestr. 2-12, D-10587 Berlin, GERMANY.
Sergei P. Kruchinin and Stamatis K. Patapis, "Specific Heat of d-Wave Pairing in Cuprate Superconductors." Presented at the XXI Int. Conf. on Low Temp. Phys. (LT21), Prague, Czech Republic, Aug. 8-14, 1996; to be published in Czech. J. Phys. Bogolyubov Institute for Theoretical Physics, Ukrainian Academy of Sciences, Metrologicheskaya 14-b, 252143 Kiev, UKRAINE; telephone +380 44 266 5362; telefax +380 44 266 5998; email kruchitp@gluk.apc.org.
Sergei P. Kruchinin and Stamatis K. Patapis, "Thermodynamics of d-Wave Pairing in Cuprate Superconductors." Presented at the Int. Conf. on Phys. and Chem. of Molecular and Oxide Supercond. (MOS'96), Karlsruhe, Germany, Aug. 2-6, 1996; to be published in J. Low. Temp. Phys. Bogolyubov Institute for Theoretical Physics, Ukrainian Academy of Sciences, Metrologicheskaya 14-b, 252143 Kiev, UKRAINE; telephone +380 44 266 5362; telefax +380 44 266 5998; e-mail kruchitp@gluk.apc.org. 05.70.Ln; 05.70.Jk.
J. Langhorn, Y. J. Bi, and J. S. Abell, "Platinum Group Metals as Flux Pinning Additions in Screen Printed Superconducting YBa2Cu3O7-d Thick Films." To be published in Physica C (in press). Superconductivity Research Group, School of Metallurgy and Materials, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UNITED KINGDOM; telefax +44 121 414 5209. Key words: critical current density, flux pinning, platinum, YBCO.
G. A. Levin, "On the Theory of Measurement of Anisotropic Electrical Resistivity by Flux Transformer Method." To be published in J. Appl. Phys. Department of Physics, Kent State University, Kent, OH 44242; email levin@mustang.kent.edu.
J. W. Lynn, S. Skanthakumar, Q. Huang, S. K. Sinha, Z. Hossain, L. C. Gupta, R. Nagarajan, and C. Godart, "Magnetic Order and Crystal Structure in the Superconducting RNi2B2C Materials." Submitted to Phys. Rev. B. Reactor Radiation Division, Bldg. 235, E151, National Institute of Standards and Technology, Gaithersburg, MD 20899; telephone (301) 975-6246; telefax (301) 921-9847; e-mail jeff@rrdstrad.nist.gov. 75.25.+z; 74.72.Ny; 75.30.Kz; 61.12.-q.
P. Majewski, A. Sotelo, H. Szillat, S. Kaesche, and F. Aldinger, "Phase Diagram Studies in the System Ag-Bi2Sr2CaCu2O8." Submitted to Physica C. Max-Planck-Institut fuer Metallforschung, Pulvermetallurgisches Laboratorium, Heisenbergstr. 5, D-70569 Stuttgart, GERMANY.
M. Medarde and J. Rodriguez-Carvajal, "Oxygen Vacancy Ordering in La2xSrxNiO4-d (0<=x<=0.5): The Crystal Structure and Defects Investigated by Neutron Diffraction." To be published in Z. Phys. B. Laboratorium fuer Neutronenstreuung, Eidgenoessische Technische Hochschule Zurich and Paul Scherrer Institut, CH-5232 Villigen PSI, SWITZERLAND; telephone +41 56 310 20 91; telefax +41 56 310 29 39; e-mail medarde@psi.ch. 61.12.q; 61.72.Dd; 61.72.Ji.
T. Mertelj, J. Demsar, B. Podobnik, I. Poberaj, and D. Mihailovic, "A Study of Photoexcited Carrier Relaxation in YBa2Cu3O7-d by Picosecond Resonant Raman Spectroscopy." Submitted to Phys. Rev. B. Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, SLOVENIA; D. Mihailovic's telephone +386 61-177 3729; telefax +386 61-125 1077 or -219 385 or -123 5400; e-mail dragan.mihailovic@ijs.si.
C. Michel, M. Hervieu, C. Martin, A. Maignan, M. Huve, and B. Raveau, "Modulated Ordering of Bismuth and Strontium in the '1201' Cuprate (Tl2/3Bi1/3)0.97Sr1.86Bi0.14CuO5-d." To be published in Physica C (in press). Laboratoire CRISMAT, CNRS URA 1318, ISMRA and Universite de Caen, Bd. du Marechal Juin, F-14050 Caen Cedex, FRANCE; telefax +33 31 95 1600.
L. Mieville, T. H. Geballe, L. Antognazza, and K. Char, "Ti- and CaSubstitution in SrRuO3 Thin Films by Sequential Deposition Process." To be published in Appl. Phys. Lett., Oct. 1996. Edward L. Ginzton Laboratory, Stanford University, Stanford, CA 94305-4085; telephone (415) 725-1822; telefax (415) 725-2189; e-mail mieville@loki.stanford.edu; web site http://loki.stanford.edu/~mieville/.
P. N. Mikheenko, S. X. Dou, S. J. Lewandowski, and I. S. Abaliosheva, "Quasi-2D Behavior of HTSCs: The Consequence of the Small Effective Thickness of Superconducting Layers." To be published in Supercond. Sci. & Technol., Vol. 9 (1996). Center for Superconducting and Electronic Materials, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, AUSTRALIA; telephone +61 42 21 4594; telefax +61 42 21 4557; e-mail mikhe@uow.edu.au.
P. N. Mikheenko, J. Horvat, M. Ionescu, and S. X. Dou, "Two-Dimensional Effects in ac Losses of Bi2Sr2Ca2Cu3Ox Tapes." Submitted to Physica C. Center for Superconducting and Electronic Materials, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, AUSTRALIA; telephone +61 42 21 4594; telefax +61 42 21 4557; e-mail mikhe@uow.edu.au. Key words: ac susceptibility of superconductors, CuO planes, grain boundaries, interlayer pairing, multilayers.
P. N. Mikheenko, M. Ionescu, J. Horvat, and S. X. Dou, "Second Peak in ac Losses of Bi2Sr2Ca1Cu2Ox Tapes." Submitted to Physica C. Center for Superconducting and Electronic Materials, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, AUSTRALIA; telephone +61 42 21 4594; telefax +61 42 21 4557; e-mail mikhe@uow.edu.au.
J. Mucha, M. Ausloos, H. Bougrine, R. Cloots, M. Houssa, S. Stassen, and M. Pekala, "Magnetotransport Studies of Polycrystalline Bi2223 Superconductors." To be published in the Proc. of the Seminar on HTSC, Poland, Sept. 22-27, 1996. SUPRAS, Insitut d'Electricite Montefiore, Universite de Liege, B28, Liege, BELGIUM.
Paul Muzikar, "Unconventional Superconductivity." Department of Physics, Purdue University, West Lafayette, IN 47907. 74.20.De; 74.20.Fg; 74.70.Tx; 74.72.-h.
Masayuki Okuya, Takao Sasagawa, Tsuyoshi Kimura, Jun-ichi Shimoyama, Koichi Kitazawa, and Kohji Kishio, "The Second Peak Effect Observed in Sr-Overdoped (La1-xSrx)2CuO4-d Single Crystals with Various Oxygen Deficiencies d." To be published in Physica C (in press). Department of Applied Chemistry, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, JAPAN. Key words: (La1-xSrx)2CuO4-d, single crystal, oxygen deficiency, second peak field, irreversibility field.
M. Pekala and M. Ausloos, "Magnetotransport Studies of Bi-Based High TcSuperconductors." Presented at the NATO Adv. Research Workshop on Phys. and Mater. Sci. of High Temp. Supercond. IV, Slovak Republic, July 2127, 1996. Department of Chemistry, University of Warsaw, Al. Zwirki i Wigury 101, PL-02-089 Warsaw, POLAND.
A. K. Pradhan, K. Kuroda, K. Nakao, and N. Koshizuka, "Magnetoresistance and Magnetization Studies of Nd1+xBa2-xCu3O7-d Single Crystals." To be published in Physica C. 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: magnetotransport, flux pinning, irreversibility line, magnetic relaxation.
A. K. Pradhan, B. K. Roul, S. B. Roy, P. Chaddah, D. Kanjilal, C. Chen, and B. M. Wanklyn, "Effects of Grain Boundaries and Columnar Defects on Magnetic Hysteresis of Bi2Sr2CaCu2O8+y Crystals." To be published in Solid State Commun. Low Temperature Physics Group, Centre for Advanced Technology, Indore 452013, INDIA.
A. V. Puchkov, D. N. Basov, and T. Timusk, "Pseudogap State in High-Tc Superconductors: An Infrared Study." Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, CANADA L8S 4M1. 74.25.Gz; 74.25.-q; 74.25.Fy.
X. D. Qiu, L. Gao, Q. M. Lin, Y. Y. Xue, and C. W. Chu, "QuasiHydrostatic Pressure Dependence of Tc in HgBa2Ca3Cu4O10+d and HgBa2Ca4Cu5O12+d." Submitted to Mod. Phys. Lett. B. Texas Center for Superconductivity, University of Houston, Houston, TX 77204-5932; telephone (713) 743-8200; telefax (713) 743-8201; e-mail preprints@www.tcs.uh.edu. Key words: high-temperature superconductor, pressure effects, mercury compound. 74.72.Jt; 74.62.Fj.
M. Ricco, M. Bisbiglia, R. De Renzi, and F. Bolzoni, "Observation of Superconductivity in TDAE-C60." To be published in Solid State Commun. Dipartimento di Fisica, Istituto Nazionale di Fisica della Materia, Universita di Parma, I-43100 Parma, ITALY. Key words: fullerenes, magnetically ordered materials, superconductors.
E. F. Righi, S. A. Grigera, G. Nieva, D. Lopez, and F. de la Cruz, "Finite Vortex Correlation in the c Direction in YBa2Cu3O7-d above the First Order Melting Transition." Submitted to Phys. Rev. Lett. Centro Atomico Bariloche and Instituto Balseiro, Comision Nacional de Energia Atomica, 8400 San Carlos de Bariloche, ARGENTINA.
S. B. Roy, A. K. Pradhan, and P. Chaddah, "On the Anomalous Magnetic Properties of Superconducting CeRu2." To be published in Physica C (in press). Low Temperature Physics Group, Centre for Advanced Technology, Indore 452013, INDIA; telefax+91 731 481 426; e-mail sbroy@cat.ernet.in.
S. Salib, M. K. Mironova, C. Vipulanandan, and K. Salama, "Mechanical Properties and TEM Studies on BPSCCO-2223/Ag Composite Tapes." To be published in Supercond. Sci. & Technol. Contact C. Vipulanandan, Texas Center for Superconductivity, University of Houston, Houston, TX 772045932; telephone (713) 743-8200; telefax (713) 743-8201; e-mail preprints@www.tcs.uh.edu.
M. Sato, J. Akimitsu, H. Takahasi, and N. Mori, "Effect of High Pressure on Tc of a Homologous Series of Oxycarbonate Superconductors Sr2(Ca,Sr)n-1Cun(CO3)1-x(BO3)xOy (n=1,2) and Ba2Ca2Cu3(CO3)1-x(BO3)xOy." To be published in Physica C (in press). Contact J. Akimitsu, Institute for Solid State Physics, University of Tokyo, Minato-ku, Tokyo 106, JAPAN; telefax +81 3 5384 6100; e-mail jun@phys.aoyama.ac.jp. Key words: high pressure, high-Tc superconductor, oxycarbonate superconductor.
Zhi-Yuan Shen, Charles Wilker, Philip Pang, Dean W. Face, Charles F. Carter III, and Camille M. Harrington, "Power Handling Capability Improvement of High-Temperature Superconducting Microwave Circuits." To be published in IEEE Trans. Appl. Supercond. DuPont Superconductivity, Experimental Station, Wilmington, DE 19880-0304.
M. V. Simkin and J. M. Kosterlitz, "Finite Size and Current Effects on IV Characteristics of Josephson Junction Arrays." Department of Physics, Brown University, Providence, RI 02912-1843; e-mail simkin@barus.physics.brown.edu. 74.25.Fy; 74.50.+r.
A. W. Smith, T. W. Clinton, Wu Liu, C. C. Tsuei, A. Pique, Qi Li, and C. J. Lobb, "Pinning and the Intrinsic Magnetic Field Dependence of the Mixed-State Hall Conductivity in Amorphous Mo3Si and YBa2Cu3O7-d." Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, MD 20742-4111. 74.25.Fy; 74.60.Ge.
J. C. Soret, L. Ammor, A. Smina, B. Martinie, A. Ruyter, J. Lecomte, Ch. Gasser, Ch. Goupil, and Ch. Simon, "Kosterlitz-Thouless Behavior in TI2212 Granular Thin Films." To be published in J. Phys. Laboratoire de Physique Electronique et Thermodynamique des Oxydes, Universite de Tours - UFR Sciences et Techniques, F-37200 Tours, FRANCE. 74.40.+k; 74.50.+r.
V. V. Srinivasu, R. Pinto, and M. D. Sastry, "Magnetic Shielding Effects in Ag-Doped and Pure YBa2Cu3O7-x Thin Films Probed by Non-Resonant Microwave Absorption." To be published in Appl. Supercond. Solid State Electronics Group, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, INDIA; telephone +91 22 215-2971 or -2979; telefax +91 22 215 2110; e-mail vvs@tifrvax.tifr.res.in. 74.76.Bz; 74.72.Bk; 74.25.Nf; 74.50.+r; 74.25.Ha.
C. J. Stevens, D. Smith, C. Chen, J. F. Ryan, B. Podobnik, D. Mihailovic, G. A. Wagner, and J. E. Evetts, "Evidence for Two-Component High-Temperature Superconductivity in the Femtosecond Optical Response of YBa2Cu3O7-d." Submitted to Phys. Rev. Lett. Department of Physics, Clarendon Laboratory, Oxford University, Oxford OX1 3PU, UNITED KINGDOM; D. Mihailovic's telephone in Ljubljana, Slovenia +386 61-177 3729; telefax +386 61-125 1077 or -219 385 or -123 5400; e-mail dragan.mihailovic@ijs.si.
Katsumi Tanigaki and Otto Zhou, "Conductivity and Superconductivity in C60 Fullerides." Manuscript #6.1174; to be published in Schegolev Memorial Vol. of J. de Physique I. Fundamental Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba 305, JAPAN; telefax +81 298 56 6136; e-mail kat@exp.cl.nec.co.jp; Otto Zhou's telefax in Chapel Hill, NC (919) 962-0480; e-mail zhou@physics.unc.edu. 74.70.Wz; 61.10.-i; 75.20.-g.
B. P. Thrane, J. Dumas, C. Schlenker, and R. Buder, "Field Modulated Microwave Absorption and Irreversibility Line in YBa2Cu3O7 Thin Films." To be published in Physica C (in press). Contact J. Dumas, Laboratoire d'Etudes des Proprietes Electroniques des Solides, CNRS, BP 166, F-38042 Grenoble Cedex 9, FRANCE; telefax +33 76 88 79 88; e-mail dumas@lepes.polycnrs-gre.fr. Key words: microwave absorption, mixed state, flux lattice, flux pinning. 74.72.Bk; 74.25.Nf; 74.60.Ge.
G. Triscone, R. E. Gladyshevskii, S. H. Han, J. Herrmann, and M. B. Maple, "Effect of Pressure on the Electrical Resistivity of a 116 K Tl1223 Superconducting Ceramic." To be published in Physica C. Department of Physics and Institute for Pure and Applied Physical Sciences, University of California at San Diego, La Jolla, CA 92093; email triscone@physics.ucsd.edu. Key words: Tl-1223, resistivity, pressure effect, fluctuations.
A. Veneva, D. K. Petrov, P. Dittrich, and M. J. Naughton, "ac Susceptibility and Microstructure of Alkali Doped Polycrystalline YBCO HTSC Materials." To be published in Physica C (in press). Institute of Electronics, Bulgarian Academy of Sciences, Blvd. Tzarigradsko Chaussee 72, Sofia 1784, BULGARIA; telefax +359 2 80 00 34; e-mail angela@phys.acad.bg. Key words: ac susceptibility of superconductors, critical current density, grain boundaries, substitution effects, weak links, microstructure.
N. V. Vo, H. K. Liu, S. X. Dou, I. Kusevic, E. Babic, and J. E. Ostenson, "Processing Related Issues on the Enhancement of Critical Current Density of Bi(Pb)-2223/Ag Multifilamentary Tapes." To be published in the Proceedings of the Eighth Int. Workshop on Critical Currents in Supercond., (8th IWCC), Kitakyushu, Japan, May 27-29, 1996. Center for Superconducting and Electronic Materials, Institute of Materials Technology and Manufacturing, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, AUSTRALIA; e-mail nvv01@uow.edu.au.
G. E. Volovik, "Poisson Brackets Scheme for Vortex Dynamics in Superfluids and Superconductors and Effect of Band Structure of Crystal." 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 (#9610157).
I. von Lampe, A. Schmalstieg, S. Goetze, J.-P. Mueller, F. Zygalsky, H.J. Lorkowski, and M. Matalla, "Patterning Polymer Metal Precursor for High Temperature Superconductor Films." To be published in J. Mater. Sci. Lett. Technische Universitaet Berlin, Institut fuer Anorganische Chemie, Rudower Chaussee 5, Geb. 12.5, D-12489 Berlin, GERMANY.
A. Wahl, "Scaling Behavior of Conductivity and Magnetization in High Temperature Superconductors." To be published in Phys. Rev. B. Universite de Tours, Laboratoire d'Electrodynamique des Materiaux Avances (LEMA), UFR de Sciences, Parc Grandmont, F-37200 Tours, FRANCE. 74.40.+k; 73.50.Fq.
B. N. Wani, L. L. Miller, B. J. Suh, and F. Borsa, "Fluorination of Sr2CuO3 and High Temperature Superconducting Oxides." To be published in Physica C (in press). Ames Laboratory, Iowa State University, Ames, IA 50011; L. L. Miller's e-mail miller@ameslab.gov. Key words: synthesis of Sr2CuO2F2+x, magnetization, [19]^F NMR.
J. O. Willis, T. G. Holesinger, J. Y. Coulter, and M. P. Maley, "Magnetic Field and Field Orientation Dependence of the Critical Current Density in Bi-2212 Round Wires and Other HTS Conductors." Presented at the Appl. Supercond. Conf. (ASC'96), Pittsburgh, PA, Aug. 25-30, 1996; submitted to IEEE Trans. Appl. Supercond. MS-K763, MST-STC, Los Alamos National Laboratory, Los Alamos, NM 87545; telephone (505) 665-1320; telefax (505) 665-3164; e-mail jwillis@lanl.gov.
Jaroslaw Wosik, Lei-Ming Xie, John H. Miller, Jr., Stuart A. Long, and Krzysztof Nesteruk, "Thermally-Induced Nonlinearities in the Surface Impedance of Superconducting YBCO Thin Films." Preprint No. 96:108; presented at the Appl. Supercond. Conf. (ASC'96), Pittsburgh, PA, Aug. 25-30, 1996, to be published in IEEE Trans. Appl. Supercond. Texas Center for Superconductivity and Department of Electrical and Computer Engineering, University of Houston, Houston, TX 77204; telephone (713) 743-8200; telefax (713) 743-8201; e-mail preprints@www.tcs.uh.edu.
J. Z. Wu, S. H. Yun, S. C. Tidrow, and D. W. Eckart, "Microstructures of Mercury-Based Cuprate Thin Films." To be published in Physica C (in press). Department of Physics and Astronomy, University of Kansas, Lawrence, KS 66045; telefax (913) 864-5262; e-mail jwu@kuphsx.phsx.ukans.edu.
M. K. Wu, D. Y. Chen, F. Z. Chien, S. R. Sheen, D. C. Ling, C. Y. Tai, G. Y. Tseng, D. H. Chen, and F. C. Zhang, "Anomalous Magnetic and Superconducting Properties in a Ru-Based Double Perovskite." To be published in Z. Phys. B. Materials Science Center and Department of Physics, National Tsing Hua University, No. 101, Sec. 2, Kuang Fu Road, Hsinchu, Taiwan, REPUBLIC OF CHINA; telephone +886 3 5717470; telefax +886 3 5729115; e-mail mkwu@phys.nthu.edu.tw. 74.72.-h; 74.25.Ha; 75.40.Gb; 75.30.Et.
A. M. Yaremko and S. P. Kruchinin, "Coupled States and Many Zone Effects in Problem of HTSC in Crystals." To be published in the Proc. of the XXI Int. Conf. on Low Temp. Phys. (LT21), Prague, Czech Republic, Aug. 8-14, 1996. Institute of Semiconductor Physics, Ukrainian National Academy of Sciences, Prospect Nauki, 45, 252028 Kiev, UKRAINE; S. P. Kruchinin's telephone +380 44 266 5362; telefax +380 44 266 5998; e-mail kruchitp@gluk.apc.org.
R. Yoshizaki and H. Ikeda, "Negative Out-of-Plane Magnetoresistance of Bi2(Sr,La)2CuO6+d Single Crystals." To be published in Physica C (in press). Institute of Applied Physics and Cryogenics Center, University of Tsukuba, Tsukuba, Ibaraki 305, JAPAN; telefax +81 298 53 2482; e-mail yoshizak@bk.tsukuba.ac.jp. Key words: Bi-2201, negative magnetoresistance, out-of-plane resistance, magneto-transport, spin gap. 74.25.-q; 74.25.Fy; 74.72.-h; 74.72.Hs; 72.15.Gd.
Andrei D. Zaikin, Dmitrii S. Golubev, Anne van Otterlo, and Gergely T. Zimanyi, "Quantum Fluctuations and Resistivity of Thin Superconducting Wires." Preprint #ETH-TH/96-36. Institute fuer Theoretische Festkoerperphysik, Universitaet Karlsruhe, D-76128 Karlsruhe, GERMANY; preprint also available at cond-mat@xxx.lanl.gov (#9609139).
Z. Zeng, Diana Guenzburger, D. E. Ellis, and E. M. Baggio-Saitovitch, "Effect of Magnetism on Superconductivity in Rare-Earth Compounds RENi2B2C." To be published in Physica C (in press). Centro Brasileiro de Pesquisas Fisicas - CBPF, Rua Dr. Xavier Sigaud, 150, 22290-180, Rio de Janeiro, RJ, BRAZIL. Key words: superconductors, rare earth, antiferromagnetic.
Q. M. Zhang, H. M. Shao, Y. N. Huang, Q. Chen, H. M. Shen, and Y. N. Wang, "Elastic Anomalies in Single-Phase HgBa2Ca2Cu3O8+d." To be published in Physica C (in press). Department of Physics, National Laboratory of Solid State Microstructures, Institute for Solid State State Physics, Nanjing University, Nanjing 210093, PEOPLE'S REPUBLIC OF CHINA.
Anatoley T. Zheleznyak, Victor M. Yakovenko, and Igor E. Dzyaloshinskii, "Parquet Solution for a Flat Fermi Surface." To be published in Phys. Rev. B. Department of Physics and Center for Superconductivity Research, University of Maryland, College Park, MD 20742; preprint also available at cond-mat@xxx.lanl.gov. (#9609118). 74.25.-q; 74.25.Dw; 74.72.-h; 75.30.Fv.
X. G. Zheng, M. Suzuki, C. Xu, H. Kuriyaki, and K. Hirakawa, "Synthesis of Ca-Substituted Y1-xCaxBa2Cu4O8 at Ambient Pressure Using CuI." To be published in Physica C (in press). Department of Physics, Faculty of Science and Engineering, Saga University, Saga 840, JAPAN. Key words: Y1-xCaxBa2Cu4O8, CuI, synthesis process.
*Feb. 28 - March 4, 1997: Fifth International Conference on Materials and Mechanisms of Superconductivity and High-Temperature Superconductors (M2S-HTSC-V), Beijing, China. Two plenary sessions, 30-33 microsymposia and oral sessions (three or four parallel sessions, at least two sessions to be reserved for latest new results and outstanding post deadline contributions), three tutorial sessions, and poster sessions. Topics include high-Tc materials; physical properties of high-Tc materials; magnetism and superconductivity; vortices, pinning, and flux melting; thin films and multilayers; Josephson junctions; applications; heavy fermions; organic superconductors; fullerenes; and theory. Exhibition of high-Tc superconducting materials, low-temperature experimental appliances, and cryogenic engineering and refrigeration instruments. Conference language is English. Abstract and manuscript deadline, January 31, 1997.** For information, contact D. Jin, M2SHTSC-V Secretariat, Cryogenic Laboratory, Chinese Academy of Sciences, P.O. Box 2711, Beijing 100 080, People's Republic of China; telephone +86 10 255 1143; telefax +86 10 256 4049; e-mail djin@cl.cryo.ac.cn; Web site http://sun1.bham.ac.uk/hey/conferences/. **Note revised abstract deadline.
*March 17 - 21, 1997: APS March Meeting -- Focussed Session on Industrial Applications of High-Temperature Superconductor Materials, Kansas City, MO. Sponsored by the APS Forum on Industrial and Applied Physics. Appropriate topics for this session include the following: passive microwave devices for cellular and PCS applications; ferroelectric/HTS tunable microwave devices; junction-based electronics; magnetic-field sensing with SQUIDs, scanning SQUID magnetometers, and SQUID-based picovoltmeters; and HTS tapes, cables, and coils. Papers are solicited. Abstract deadline December 6, 1996. For further information, contact Eric Moser, USAF Wright Laboratory, Electromagnetic Materials Devision (WL/MLPO), Wright-Patterson AFB, OH 45433; telephone (513) 255-4474, ext. 3255; telefax (513) 255-4913; e-mail moserek@ ml.wpafb.af.mil.
April 27 - 29, 1997: Free Boundary Problems in Superconductivity: Device & Process Modeling, SPA, Belgium. For information, contact Marcel Ausloos, Chair, S.U.P.R.A.S. Institut de Physique B5, Universite de Liege, Sart Tilman, B-4000 Liege, Belgium, telephone +32 4 366 37 52; telefax +32 4 366 29 90; web site http://www.phe.ulg.ac.be/supras.html.
May 26 - 28, 1997: International Workshop on Tl and Hg Based Superconducting Materials, University of Cambridge, Cambridge, United Kingdom. Objective is to provide a comprehensive overview of research and development activities in these materials. Main topics include: processing, physical properties, critical currents and microstructure of single crystals, thick and thin films, and wires and tapes. Oral and poster papers; proceedings to be published. For further information, contact Shiming Wu, IRC in Superconductivity, University of Cambridge, Cambridge CB3 0HE, United Kingdom; telefax +44 1223 33 7074; e-mail sw204@cus.cam.ac.uk.
July 14 - 16, 1997: Symposium on Synthesis, Properties and Applications of High Temperature Superconductors, Gold Coast, Queensland, Australia. Topics include (but are not limited to): powder synthesis and novel processing; chemistry, phase relationships, and nonstoichiometry; relationships between microstructures and properties; flux pinning and weak links; anisotropy and two-dimensional behavior; transport and magnetic properties; mechanical properties; processing for the development of flux pinning centers; fabrication of wires, tapes, magnets, and bulk materials; and applications and future trends. Abstracts (250 words) are solicited. Abstract deadline, January 5, 1997. Contact T. Chandra, Department of Materials Engineering, University of Wollongong, Wollongong 2522, Australia; telefax +61 42 213-112 or -214-921; e-mail t.chandra@uow.edu.au.
*Aug. 25 - 28, 1997: 16th General Conference of the Condensed Matter Division of the European Physical Society, Katholieke Universiteit Leuven, Leuven, Belgium. Particular emphasis on the following areas: low-temperature physics and superconductors, magnetism and metals, semiconductors and insulators, soft matter and statistical mechanics, and surfaces and interfaces. Special symposium "Forty Years of the Vortex State" by A. A. Abrikosov. For further information, contact The Secretary-General, 16th CMD-General Conference, Department Natuurkunde K. U. Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium; telephone +32 16 32 71 75; telefax +32 16 32 79 83.
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. 10, #22, November 15, 1996.