The High-Tc Update web page is located at the URL
http://www.iitap.iastate.edu/htcu/htcu.html
PLEASE NOTE: Issues of High-Tc Update from November 15, 1993, onward are also available in coded Word versions (BINHEX and RTF). (These versions preserve the Greek letters, special characters, accents, etc.) If you are interested in the alternate formats, contact the editor for information.
IBAD Mechanism
The fabrication of biaxially aligned yttria-stabilized zirconia (YSZ) buffer layers grown on polycrystalline metallic substrates using ionbeam-assisted deposition (IBAD) has raised considerable interest. Such buffer layers have been used as crystallographic templates for the deposition of thick YBa2Cu3O7-d (YBCO) films that have self-field, 77 K critical current densities in excess of 10^5 A/cm^2. It has been suggested that the mechanism by which IBAD leads to biaxial alignment is selective resputtering due to ion channeling.
Two preprints by K. G. Ressler et al. (MIT) describe studies of the mechanism of biaxial alignment for YSZ and La1-xCaxMnO3 (LCMO) films prepared by IBAD. The authors studied films deposited with both dual ion-beam deposition and ion-assisted electron-beam evaporation. The authors found that the film texture formation depends mostly on the ratio of ion bombardment to molecule arrival and the angle of the incident ions with respect to the substrate. The results were found not to depend on the deposition technique. The authors report that the biaxial alignment of YSZ and LCMO via IBAD is not due to ion channeling, nor is it due to anisotropic sputtering. Instead, the preferred film orientation develops because of anisotropy of ion-induced damage on various crystal surfaces.
The authors conclude that IBAD biaxial alignment occurs when damagetolerant crystallographic planes face the assisting ion beam. The accumulation of ion damage leads to changes in the growth direction of film grains. The growth direction of misaligned grains changes in discrete units corresponding to the introduction of low-angle grain boundaries and special boundaries in the crystal. Changes in growth direction occur with highest frequency for misaligned grains and with lowest frequency for grains with damage-tolerant planes exposed to the assisting ion beam. The length scale over which biaxial alignment is established depends on the relative damage tolerance of different crystal planes, the deposition rate relative to the defect introduction rate, the nucleation density and island orientation, and the rate at which defects are annealed by atom mobility.
Homologous Series
A preprint by H. Yamauchi (Tokyo Tech) and M. Karppinen (Helsinki University of Technology) discusses how to classify the known superconducting cuprates as members of homologous series. The authors use the general expression MmA2Qn-1CunOm+2+2n+-d [M-m2(n-1)n]. In this designation the MmOm+-d unit refers to the charge-reservoir block between adjacent Qn-1CunO2n blocks, and A2O2 indicates the alkalineearth oxide layers between the charge-reservoir and CuO2 layers. Each member of a homologous series thus has the same charge-reservoir block (M and m are fixed), but the number n of CuO2 planes is different. The authors also suggest using the term homologous series only if the members with n up to 3 have been found experimentally.
For the case of structures containing fluorite blocks, the structure is expressed by MmA2kBsCu1+kOm+4k+2s [M-m(2k)s(1+k)], where B metal atoms form the BsO2s fluorite block unit. The authors note that the infinitelayer compounds, such as (Sr,Nd)CuO2, are described by this formula with m = k = 0 and s = 1, and thus should be designated as 0011 compounds. Similarly, the T' structure, as in (Nd,Ce)2CuO4, corresponds to m = k = 0 and s = 2, and hence should be identified as the 0021 structure.
The authors also discuss hole-doping mechanisms, charge transfer, and bond-valence sums. They conclude that for n >= 3, net holes are concentrated and/or confined in the innermost CuO2 planes, and they note that this is an important consideration for the determination of Tc.
RBa2Cu3O7-d
The [169]^Tm nuclear magnetic relaxation in TmBa2Cu3O6+x (x = 0.1 - 1.0, Delta-x = 0.1) and TmBa2Cu4O8 has been studied by O. N. Bakharev (Kazan State) et al. at temperatures below 5 K. In all samples, the Tm spinlattice relaxation proceeds via intrinsic paramagnetic centers (PCs), such as Cu^[2+] or Cu-O spin-polarized clusters. The data for TmBa2Cu3O6+x support the idea of structural microphase separation in oxygen-deficient compounds. The samples with x >= 0.4 contain both hole-poor nonsuperconducting regions enriched with PCs and hole-rich (PC-poor) superconducting regions.
An analysis of the specific heat data near Tc has been carried out by T. Plackowski (Wroclaw) for three SmBa2Cu3O7-d samples processed differently under an oxygen pressure of 250 bar. Both the mean-field BCS-like contribution and 3D Gaussian fluctuations were taken into account, and values of the coherence length xi_[GL] were determined.
A novel experimental approach, based on electron diffraction, has been used by Y. Zhu (Brookhaven) and J. Tafto (Oslo) to determine the amplitudes and phases of Bragg reflections at low angles. The authors used this technique to measure charge transfer in YBa2Cu3O7. They found that the structure factor of the (001) reflection, which is very sensitive to the distribution of valence electrons within the unit cell, corresponds in the purely ionic model to (76+-8)% of the electron holes being located in the CuO2 planes of the fully oxygenated samples.
The domain structure and Y2BaCuO5 (211) distribution in single- and multiple-domain melt-textured YBa2Cu3O7-d (123) have been studied by P. Diko (Kosice) et al. The authors explain the subgrain (SG) formation in terms of the transition from planar to cellular growth. The subgrains were classified according to their origin as a-SGs (formed by a-growth), c-SGs (formed by c-growth), and a-c SGs (formed by a combination of aand c-growth). The observed inhomogeneity of 211 particle distribution was explained by pushing/trapping theory. Pushing of the 211 particles by c-growth 123 domains leads to a deficiency of 211 in the central parts of the sample and an excess of 211 at the rim.
Bi Cuprates
A recent paper by P. Yang and C. M. Lieber (Harvard) [Science 273, 1836 (1996)] describes significant enhancements of Jc and the irreversibility line resulting from the introduction of nanorods of MgO (diameters 5-50 nm) into Bi2Sr2CaCu2O8+d (Bi-2212). The authors note that these enhancements are comparable with those observed previously with columnar defects in heavy-ion-irradiated samples. The maximum density of nanorod defects achieved, however, corresponds to a matching field of B_[phi] = 0.25 T, which is much lower than that produced by ion irradiation. The authors thus note that the nanorod density will need to be increased to extend the range of fields for which strong pinning is observed.
As reported by Q. Wang (Bath) et al., measurements have been made of ultrasonic shear-wave attenuation and sound velocity in highly textured polycrystalline samples of Bi2Sr2CaCu2O8+d (Bi-2212) in magnetic fields up to 9 T and at temperatures down to 4.2 K. Magnetic-field-dependent attenuation peaks and velocity enhancements were found to be in good agreement with theoretical predictions [J. Pankert, Physica C 168, 335 (1990)] based on the assumptions of the thermally assisted flux-flow (TAFF) model of the mixed state [P. H. Kes et al., Supercond. Sci. Technol. 1, 242 (1989)]. The flux-line lattice was found to be fully pinned at the lowest temperatures.
Silver-sheathed BSCCO conductors prepared by B. Lehndorff (Wuppertal) et al. using profile rolling achieved Jc values of 2.5 x 10^4 A/cm^2 for Bi-2223 tapes and 5 x 10^3 A/cm^2 for Bi-2212 wires. The authors measured current-voltage characteristics at temperatures between 4.2 K and 100 K in magnetic fields up to 8 T and found the anisotropy of Jc with different orientations of the magnetic field to be strongly temperature dependent in Bi-2223. Below 40 K the anisotropy is weak because of the more three-dimensional behavior of this material.
By manipulating the cooling rate after the final heat treatment, J. A. Parrell (Wisconsin) et al. have raised the 77 K, self-field critical current density Jc of multifilamentary (Bi,Pb)2Sr2Ca2Cu3O10+d [(Bi,Pb)2223] tapes by a factor of three, and the irreversibility field H* by more than 50%. The Jc of samples cooled in 7.5% O2 from their reaction temperature of 825^oC increased from ~8 x 10^3 A/cm^2 to ~2.4 x 10^4 A/cm^2, and H*(77K) increased from ~120 mT to ~200 mT, as the cooling rate was decreased from 5^oC/min to 0.016^oC/min. As stressed by the authors, these results unambiguously show that the flux-pinning properties of (Bi,Pb)-2223 tapes can be improved by simple changes in wire processing.
A preprint by W. R. Blumenthal (Los Alamos) et al. reports improvements in Jc generated by modifying the strain state during rolling of silversheathed Bi2Sr2Ca2Cu3O10+d (Bi-2223). Tapes deformed with combined shear and compression exhibited higher Jc values than tapes subjected to pure compression, yet their microstructures showed little difference in the amount of nonconducting (including porosity) phase content. Constraining the tape width resulted in the most significant increase in Jc, which corresponded to a much lower porosity and nonconducting phase volume in the oxide near the tape edge.
As found by N. V. Vo et al. (Wollongong), for a given precursor with a particular nominal composition there is an optimal sintering period for a particular temperature and deformation between sintering stages for short single-core silver-clad (Bi,Pb)-2223 tapes. SEM images of the superconductors' cross sections after each sintering period reveal better core morphology and density with a much smoother superconductor/silver interface for this particular sintering period. Prolonged sintering generally leads to greater porosity, while shortduration sintering inhibits grain growth and is thus of no assistance to the healing of cracks induced during the intermediate deformation between sintering periods. The phase development of the high-Tc 2223 phase is at its greatest growth rate, and the electrical properties are enhanced, when the connectivity and density of the ceramic core are at their highest.
Other Cuprates
The magnetoresistance of underdoped La2-xSrxCuO4 films with x = 0.048 and 0.051 has been studied by K. Karpinska (Warsaw) et al. in magnetic fields up to 8.5 T and at temperatures down to 30 mK. The results indicate that the magnetic-field-induced superconductor-insulator (SI) transition is qualitatively different from the reentrant transition first described for indium oxide and interpreted as leading to a bosonic insulator phase. The ground state in the absence of superconductivity appears to be insulating. The superconducting transitions become narrower below 1 K and show that the resistive critical field diverges with the approach to zero temperature, as has been observed in some other high-Tc systems.
Pure electronic Raman spectra with no phonon structures superimposed on the low-energy electronic continuum are reported by A. Sacuto (Paris) et al. in optimally doped HgBa2CaCu2O6+d (Hg-1212) single crystals (Tc = 126 K). The authors' low-temperature (15 K) spectra for the A_[1g], B_[1g], and B_[2g] symmetries exhibit striking differences from previous data in Bi2Sr2CaCu2O8+d (Bi-2212). The shapes of the spectra for the various symmetries cannot be fitted by Devereaux's d_[x^2-y^2] calculations but strongly suggest a d_[xy] gap with minima along the [100] and [010] directions.
Single crystals of Hg0.8Bi0.2Ba2Can-1CunO2n+2+d [(Hg,Bi)-12(n-1)n] with n =2 and 3 have been grown by D. Pelloquin et al. (Caen) using Bi2O3 as a flux during growth. The Bi cations act as stabilizers of the structure, so that neither a dry box nor high pressure is required. The as-grown crystals exhibit critical temperatures of 121 K and 130 K for the 1212 and 1223 phases, respectively. The irreversibility lines and fishtail lines of (Hg,Bi)-1223 were found to lie above those of (Hg,Bi)1212, suggesting that 1223 is less anisotropic than 1212.
As reported in a preprint by I. F. Schegolev et al. (ISSP- Chernogolovka), the magnetic susceptibility and [63]^Cu and [205]^Tl nuclear spin-lattice relaxation rates have been measured in the hightemperature superconductor Tl2Ba2CuO6+d (Tl-2201) to learn why Tc decreases with oxygen doping. The experiments revealed the presence of localized paramagnetic centers, whose concentration grows with increasing oxygen content. The authors suggest that these centers give rise to magnetic scattering of the Cooper pairs and thus suppress Tc. This idea is supported by the observation of pair-breaking effects in the NMR Knight-shift and relaxation-rate behavior in the superconducting state.
Magnetic irreversibility data have been obtained by I. K. Gopalakrishnan and J. V. Yakhmi (Bhabha Atomic Research Center) for the Tl-monolayer superconductor TlBaSrCaCu2O7 (Tc = 104 K) from dc magnetization measurements at several applied magnetic fields. The irreversibility line (IL) in the (H,T) plane follows the power law H = A(1-T/Tc)^n with n = 2.31. The IL is close to those of other Tl monolayer cuprates but above those of Tl bilayer phases.
A preprint by J. T. Markert et al. (Texas-Austin) reports results of recent research on electron-doped infinite-layer compounds (e.g., Sr1xLaxCuO2), T'-phase compounds (e.g., Nd2-xCexCuO4), and spin-1/2 quasi1D ladder compounds (e.g., Sr14Cu24O41), including structural and magnetic measurements. Studies of steric effects indicate that superconductivity disappears in both electron-doped systems for values of the in-plane lattice constant below a critical value, a_[cr] ~~ 3.92 Angstroms. The authors also describe attempts to hole-dope the infinite-layer and T' phases.
Vortices
A preprint by M. A. Moore (Manchester) casts doubt on the idea that there is a well-defined vortex-lattice liquid-to-solid phase transition as the temperature is lowered. Instead, the author argues that at all nonzero temperatures the system is in the vortex-liquid state and that it is only finite-size effects that produce the semblance of a phase transition. He thus explains the experimental observations as a crossover between three-dimensional behavior at high temperatures to two-dimensional behavior at low temperatures, an apparent transition occurring when the phase coherence length in the liquid becomes comparable with the sample thickness. The author estimates the width of the crossover region, the phase-coherence length, and the entropy change Delta-S and finds these to be in agreement with experiment.
Multi-terminal measurements have been made by D. T. Fuchs (Weizmann Institute) et al. on Bi2Sr2CaCu2O8+d (Bi-2212) crystals to investigate the vortex dimensionality at the fields and temperatures where the first-order transition takes place in the vortex lattice. The authors find a sharp hysteretic transition in transport properties with current injected either parallel or perpendicular to the ab planes. The data indicate that both resistivity components disappear concurrently, and that the melting and c-axis decoupling transitions occur simultaneously at a sublimation transition of the vortex lattice.
High-resolution adiabatic specific-heat measurements have been carried out by M. Roulin et al. (Geneve) on YBa2Cu3O7-d (0 <= d <= 0.05) in magnetic fields from 0 to 14 T (B||c and B perp. to c). In a 0.3 g twinned crystal with strong pinning, the authors consistently observed a step at the melting temperature T_m of the vortex solid up to a critical point that depends on d. The field B_m and step temperature T_m were found to obey the relation B_m = B_[m0](d)(1-T_m/Tc)^n, with an exponent n ~~ 4/3. The anisotropy of B_m was found to be the same as that of the upper critical field B_[c2]. In an 18 mg twinned crystal of high purity with low pinning, the authors observed first-order-like specific heat peaks on the melting line from 8 T to 14 T. The entropy under these peaks was found to be ~~0.5 k_B per vortex per bilayer. The authors attribute these characteristic features to the melting of a vortex glass in the former case and that of a vortex lattice in the latter case.
Simulations of B(x,y,H), M(H), and Jc(H), where H is a function of time, have been carried out by J. Groth et al. (Michigan) for hard superconductors containing both uncorrelated pinning sites and twinboundary pinning. The authors numerically solve the overdamped equations of motion of up to 10^4 flux-gradient-driven straight vortices, which can be temporarily trapped at ~10^6 pinning centers. The simulations relate macroscopic measurements [e.g., M(H) and flameshaped B(x,y) profiles] with the underlying microscopic pinning landscape and the plastic dynamics of individual vortices.
Films
A preprint by M. Covington and L. H. Greene (Illinois-Urbana) describes experiments on Y1-xPrxBa2Cu3O7/Pb planar tunnel junctions showing that the energy of a gap-like feature decreases as Tc decreases, and that the zero-bias conductance peak disappears for the highest Pr concentration studied. This reproducible behavior was observed only for junctions fabricated on (100)-, (110)-, and (103)-oriented (non-c-axis) YPBCO superconducting thin films. In contrast, junctions fabricated on (001)oriented (c-axis) films displayed a qualitatively different gap-like feature at an energy that is independent of Tc. The authors note that these results are consistent with, but do not prove, d-wave superconductivity.
Experimental evidence for infrared-quenched photoinduced persistent conductivity in oxygen-deficient YBa2Cu3O6+x is presented in a paper by D. C. Chew (New Jersey Institute of Technology) et al. The authors interpret the results in terms of both a charge-transfer model, in which photogenerated electrons are trapped in oxygen-vacancy defects, and a photoassisted oxygen-ordering model. Infrared illumination of the photoinduced state results in detrapping of electrons, a recombination of the photogenerated holes and electrons, and a partial quenching of the photoinduced state. The authors suggest the possibility of optically controlled superconducting devices in which the superconducting state is generated and quenched with different colors of light.
Two papers by S. C. Tidrow et al. (Fort Monmouth) reports progress in the search for new substrates for high-temperature superconductors at microwave frequencies. One of these describes a new substrate material, LSAT, a 30/70 mole% solid solution between LaAlO3 and Sr2AlTaO6, which eliminates the twinning, strain, and nonisotropic microwave properties of pure LaAlO3. At 10 GHz and 300 K, these substrates have dielectric constant 22.5 and loss tangent tand ~~ 10^[-3]. In another paper, the authors report the 10 GHz and 300 K dielectric properties of numerous perovskite antimonates of the form A2MeSbO6, where A = Ba or Sr, Me = a rare earth, Y, Sc, Ga, or In, or A4MeSb3O12, where A = Ba or Sr and Me = Li, Na, or K. Further details on the latter materials are given in two preprints by A. Tauber (Geo-Centers) et al.
The structure of a stable vicinal SrTiO3 (001) surface has been studied by T. Haage et al. (MPI-Stuttgart) using UHV scanning tunneling microscopy. The authors find that the regular nanoscale step structure on the vicinal surface strongly influences the growth of c-axis-oriented YBa2Cu3O7-d (YBCO) thin films. It generates an almost periodic surface structure on the YBCO films. This substrate-mediated control of the film growth is especially important because the resulting YBCO microstructure leads to in-plane anisotropy of the transport properties
As described in a paper by A. Ignatiev et al. (TCSUH), thick superconducting YBa2Cu3O7-d films grown by photo-assisted metalorganic chemical vapor deposition, which have shown a decrease of Jc with increasing thickness greater than 1 micrometer, have been exposed to ion irradiation in an attempt to enhance Jc. The authors report that a 4.5 micrometers film irradiated with 1 MeV protons at a dose of 3 x 10^[14]/cm^2 showed an increase in Jc by a factor of nearly 20 to 1.7 x 10^6 A/cm^2. The results support the idea that a lack of pinning centers in the grown thick films with high crystalline quality contributed to the observed decrease of Jc with increasing film thickness.
A critical-state model has been developed by J. McDonald (Ames Lab Iowa State) et al. for calculating the power-dependent resistance, reactance, and harmonic generation in superconducting microwave resonators of elliptical and rectangular thin-film cross section.
Applications
A preprint by M. Schilling et al. (Hamburg) reports that biomagnetic measurements of the human heart beat have been obtained using an integrated YBa2Cu3O7-d magnetometer mounted in a hand-held cryostat containing 100 cm^3 of liquid nitrogen. The authors compare the measurements and noise properties with those made in a conventional cryostat. The low-noise magnetometer consists of a multiloop pickup coil coupled inductively via a five-turn flux transformer to a dc SQUID based on ramp-type Josephson junctions with PrBa2Cu3O7-d barriers. The design and performance of the magnetometer are described in a preprint by R. Scharnweber and M. Schilling (Hamburg), and the electrical and noise properties of the YBCO ramp-type junctions are reported in a preprint by M. Schilling.
The fabrication and characterization of melt-processed YBCO for magnetic levitation applications are described in a preprint by S. Sengupta (Superconductive Components). Seeds of Nd1+xBa2-xCu3O7-d were used to initiate grain growth and control the orientation of YBCO grains. Samples with diameter as large as two inches have been grown. Models for the magnetic levitation force and magnetic stiffness are presented in preprints by B. Lehndorff (Wuppertal) et al. and by T. Hikihara and G. Isozumi (Kansai).
Theory
The Josephson plasma mode in the mixed state of a single Josephson junction and of a layered superconductor is considered in a preprint by L. N. Bulaevskii (Los Alamos) et al. The authors calculate the frequencies and optical weights of plasma modes that can be excited by an external spatially homogeneous ac electric field in the mixed state. For layered superconductors, the authors discuss qualitatively the angular dependence of the plasma frequency for a tilted magnetic field using an interpolation formula between results known for perpendicular and parallel fields. The authors predict that two plasma peaks may be observed in magnetic fields of the order of phi_0/gamma_s^2 oriented close to the ab plane, and that the plasma frequency increases with increasing magnetic field applied parallel to the layers.
A preprint by J. Maly et al. (Chicago) extends previous work on preformed pair models of superconductivity to incorporate Coulomb correlation effects. For neutral systems, these models have provided a useful scheme that interpolates between BCS and Bose-Einstein condensation with increasing coupling and thereby describes some aspects of pseudogap phenomena. However, charge fluctuations (via the plasmon, omega_p) significantly modify the collective modes and therefore the interpolation behavior. The authors discuss the resulting behavior of the pseudogap and thermodynamic quantities such as Tc, chi, and C_v as a function of omega_p.
Temperature crossovers seen in the magnetic and transport properties of the cuprates have been studied by A. V. Chubukov (Wisconsin) et al. using a nearly antiferromagnetic Fermi-liquid model. The authors distinguish between underdoped and overdoped systems on the basis of their low-frequency magnetic behavior and so classify the optimally doped cuprates as a special case of the underdoped cuprates. For the underdoped cuprates, the authors argue that the sequence of crossovers identified by Barzykin and Pines in the low-frequency magnetic behavior (from mean-field z = 2 at high temperatures, T > T_[cr], to nonuniversal z = 1 scaling behavior at intermediate temperatures, T_* < T < T_[cr], to pseudogap behavior below T_*) reflects the development in the electronic structure of a precursor to a spin-density-wave state.
A preprint by B. P. Stojkovic and D. Pines (Illinois-Urbana) establishes the applicability to transport phenomena in the cuprate superconductors of a nearly antiferromagnetic Fermi-liquid description of the magnetic interaction between planar quasiparticles by using it to obtain the doping- and temperature-dependent resistivity and Hall conductivity in the normal state. The authors numerically solve the Boltzmann equation for YBa2Cu3O6+x, YBa2Cu4O8, and La2-xSrxCuO4 and obtain results for the transport properties in quantitative agreement with experiment.
The behavior of de Haas-van Alphen (dHvA) oscillations in the mixed state of a type-II two-dimensional superconductor has been investigated by G. M. Bruun et al. (Oxford) using the Gor'kov perturbation scheme. Contrary to earlier calculations by other authors, the present authors do not find that the perturbative scheme predicts any maximum of the dHvA oscillations below H_[c2]. Instead, they obtain a substantial damping of the magnetic oscillations in the mixed state relative to the behavior in the normal state. The temperature and spin dependencies of the oscillations in the mixed state were found to be the same as in the normal state. Moreover, the authors investigated the recently debated issue of the possibility of a sign change in the fundamental harmonic of the magnetic oscillations, and concluded that within both perturbation theory and the exact solution there is no such effect.
The Raman scattering response in a 2D d_[x^2-y^2] superconductor has been analyzed by F. Wenger (NEC and Chalmers) and M. Kaell (Riso and Chalmers). The authors point out a strong suppression of relative intensity in the screened A_[1g] channel compared with the B_[1g] channel for a generic tight-binding model. This is in contrast with the observed behavior in high-Tc superconductors.
Other Activities
The development of a near-field scanning microwave microscope with 100 micrometers resolution is described in a preprint by C. P. Vlahacos et al. (Maryland). The probe is constructed from an open-ended resonant coaxial line, which is excited by an applied microwave voltage in the frequency range of 7.5-12.4 GHz. The images demonstrate that the smallest resolvable feature is determined by the diameter of the inner wire of the coaxial line and the separation between the sample and probe. Further improvements to image features with a 20 micrometers spatial resolution are reported in a preprint by S. M. Anlage et al. (Maryland). This system has been used not only to image the passive response of a material to microwave fields but also to actively measure the fields emitted by a high-frequency circuit.
A preprint by M. Hayashi (SRL-ISTEC and Delft) and H. Yoshioka (Nagoya) discusses the possibility of a mixed state in incommensurate chargedensity-wave materials with three-dimensional order. The mixed state is created by applying an electric field perpendicular to the chains. The authors suggest that this state should consist of topological dislocations induced by the external field and would therefore be similar to the mixed states of type-II superconductors and liquid helium II.
Overviews
A brief overview of d-wave superconductivity, chiefly from a theoretical perspective, has been prepared by K. Maki (USC) and H. Won (Hallym). The authors review the consequences for the temperature dependence of the gap parameter, specific heat, penetration depth, and NMR Knight shift. They also discuss the properties of the vortex state for B ~~ H_[c2] and B << H_[c2] (71 refs.).
Phase-sensitive experiments to determine the symmetry of the order parameter in YBa2Cu3O7-d are reviewed in a preprint by Y. Gim (Maryland) et al. The authors present evidence that the order parameter has d_[x^2-y^2] symmetry, with perhaps a small s-wave component (40 refs.).
A preprint by K. K. Likharev (SUNY-Stony Brook) gives a brief review of the rapid single-flux-quantum (RSFQ) logic family, which leads in the race to practical ultrafast superconductor digital electronics. The author also sketches a roadmap for RSFQ technology and compares it with the National Technology Roadmap for Semiconductors (22 refs.).
A step-like Hall voltage behavior in the strongly anisotropic quasi-onedimensional compound (TMTSF)2ClO4 has been interpreted in terms of the quantum Hall effect. P. Lederer (Orsay) has prepared a theoretical review paper describing this phenomenon and the physics of field-induced spin-density-wave phases (56 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.
Steven M. Anlage, C. P. Vlahacos, Sudeep Dutta, and F. C. Wellstood, "Scanning Microwave Microscopy of Active Superconducting Microwave Devices." Presented at the Appl. Supercond. Conf. (ASC'96), Pittsburgh, PA, Aug. 25-30, 1996. 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, microscopy, microwave properties, near-field imaging.
P. Auban-Senzier, D. Jerome, F. Rachdi, G. Baumgartner, and L. Forro, "Rb1C60 Under Pressure: An NMR and ESR Study." Manuscript #6.1158; to be published in Schegolev Memorial Vol. of J. de Physique I. Contact D. Jerome, Laboratoire de Physique des Solides (associe au CNRS), Universite Paris-Sud, F-91405 Orsay, FRANCE; telephone +33 1 69 41 53 01; telefax +33 1 69 28 86 80; e-mail jerome@lps.u-psud.fr. 61.48.+c; 76.60.Es.
V.P.S. Awana and J. Albino Aguiar, "Comment on 'Occurrence of Superconductivity in Ca- and Sr-Doped PrSr2Cu2.7Mo0.3O7-d.'" Submitted to Phys. Rev. B. Departamento de Fisica, Universidade Federal de Pernambuco, 50670-901 Recife-PE, BRAZIL; telefax +55 81 271 0359; e-mail awana@npd.ufpe.br.
V.P.S. Awana, S. K. Malik, and W. B. Yelon, "Effect of Ca Substitution of the Superconductivity in Y1-xBa2CaxCu3O7-y (y ~~ 0) System: A Neutron Diffraction Study." To be published in Mod. Phys. Lett. B. Departamento de Fisica, Universidade Federal de Pernambuco, 50670-901 Recife-PE BRAZIL; telefax +55 81 271 0359; e-mail awana@npd.ufpe.br.
O. N. Bakharev, A. V. Dooglav, A. V. Egorov, E. V. Krjukov, Yu. A. Sakhratov, M. A. Teplov, H. B. Brom, and J. Witteveen, "Comparative Studies of the Tm NMR in Thulium 123 and 124 Compounds: Evidence for Structural and Electronic Phase Separation." To be published in JETP Lett. Contact M. A. Teplov, Kazan State University, 420008 Kazan, RUSSIA; e-mail mikhail.teplov@ksu.ras.ru. 61.72.Hh; 74.72.Bk; 74.80.Bj; 76.60.Lz.
M. Ban, Y. Mizuno, K. Suzuki, and Y. Enomoto, "Stability of NdBa2Cu3O7-x Based Resonators in Humid Conditions." To be published in Physica C (in press). Kanto Technical Institute, Kawasaki Heavy Industries, Ltd., 118 Futatsuzuka, Noda, Chiba 278, JAPAN; telefax +81 471 24 5917. Key words: NdBa2Cu3O7-x , surface stability, surface resistance, accelerated humidity testing, resonator.
W. R. Blumenthal, Y. T. Zhu, R. J. Sebring, T. C. Lowe, and R. J. Asaro, "Quantitative Analysis of the Effects of Strain State on the Microstructure and Jc of BSCCO Tapes." Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM 87545; Y. T. Zhu's telephone (505) 667-4029; telefax (505) 667-8021; e-mail yzhu@lanl.gov.
Stephen J. Blundell and John Singleton, "Angle Dependent Magnetoresistance in Organic Metals." Manuscript #6.1073; to be published in Schegolev Memorial Vol. of J. de Physique I. Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, UNITED KINGDOM; telephone +44 1865-272 310 or -272 200; telefax +44 1865 272 400; e-mail sjb@vax.ox.ac.uk or stephen.blundell@merton.ox.ac.uk. 71.20.Rv; 71.18.+y; 72.15.Gd.
J. P. Boucher and L. P. Regnault, "The Inorganic Spin-Peierls Compound CuGeO3." Manuscript #6.1121; to be published in Schegolev Memorial Vol. of J. de Physique I. Unite Mixte de Recherche No. C5588 du Centre National de la Recherche Scientifique, Universite Joseph Fourier Grenoble I, BP 87, F-38402 Saint Martin d'Heres Cedex, FRANCE; telephone +33 76 51 43 38; telefax +33 76 51 45 44; e-mail boucher@labs.polycnrsgre.fr. 64.70.Rh; 75.40.Gb.
C. Bourbonnais and B. Dumoulin, "Theory of Lattice and Electronic Fluctuations in Weakly Localized Spin-Peierls Systems." Manuscript #6.1153; to be published in Schegolev Memorial Vol. of J. de Physique I. Centre de Recherche en Physique du Solide et Departement de Physique, Universite de Sherbrooke, Sherbrooke, Quebec, CANADA J1K 2R1; telefax (819) 821-8046; e-mail cbourbon@physique.usherb.ca. 71.20.Rv; 64.60.Ht; 75.40.-s.
G. M. Bruun, V. Nikos Nicopoulos, and N. F. Johnson, "Ginzburg-LandauGor'kov Theory of Magnetic Oscillations in a Type-II 2-Dimensional Superconductor." Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, UNITED KINGDOM; e-mail g.bruun1@physics.oxford.ac.uk; preprint also available at suprcon@xxx.lanl.gov (#9608004). 74.25.Ha; 74.60.-w.
L. N. Bulaevskii, D. Dominguez, M. P. Maley, and A. R. Bishop, "Josephson Plasma Mode in the Mixed State of Long Junction and Layered Superconductors." Preprint #LA-UR-96-3263. Los Alamos National Laboratory, Los Alamos, NM 87545.
N. Cao, T. Timusk, and K. Bechgaard, "Unconventional Electrodynamic Response of the Quasi-One-Dimensional Organic Conductor (TMTSF)2CIO4." Manuscript #6.1129; to be published in Schegolev Memorial Vol. of J. de Physique I. Contact T. Timusk, Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, CANADA L8S 4M1; telephone (905) 529-7070; telefax (905) 546-1252; e-mail timusk@mcmaster.ca. 78.30.-j; 75.30.Fv.
E. V. Charnaya, C. Tien, C. S. Wur, and Yu. A. Kumzerov, "Superconductivity of Gallium in Porous Glass." To be published in Physica C (in press). Institute of Physics, St. Petersburg State University, St. Petersburg, 198904 RUSSIA; telefax +7 812 428 7240. Key words: superconductivity, magnetization, SQUID, porous glass, gallium.
J. L. Chen and T. Y. Tseng, "The Interaction Between a Single Vortex and a Columnar Defect in the Superconducting Multilayers." To be published in Physica C (in press). Contact T. Y. Tseng, Department of Electronics Engineering and Institute of Electronics, National Chiao-Tung University, Hsinchu, Taiwan, REPUBLIC OF CHINA; telefax +866 35 724 361. Key words: London penetration depth, multilayers, thin films, type-II superconductors. 74.60.Ge; 74.80.Dm.
W. M. Chen, C. C. Lam, J. F. Geng, L. Y. Li, K. C. Hung, and X. Jin, "A New Calculating Formula of Iodometric Titration for High Tc Superconductors." 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.
B. Chesca, "Theory of a UHF Pumped Double SQUID." To be published in Physica C (in press). Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, RUSSIA; telefax +7 096 21 65085.
D. C. Chew, J. F. Federici, J. Gutierrez-Solana, G. Molina, W. Savin, and W. Wilber, "Infrared Quenching of Photoinduced Persistent Conductivity in YBa2Cu3O6+x ." To be published in Appl. Phys. Lett. Department of Physics, New Jersey Institute of Technology, Newark, NJ 07102; J. F. Federici's telephone (201) 596-8482; telefax (201) 5965794.
C. H. Choi, Y. Zhao, C. C. Sorrell, M. La Robina, and C. Andrikidis, "The Increase of the Critical Current Density of YBa2Cu3O7-y by a Modified Melt-Textured-Growth Method." To be published in Physica C (in press). Contact Y. Zhao, Superconductivity Research Group, School of Materials Science and Engineering, University of New South Wales, Sydney, NSW 2052, AUSTRALIA; telefax +61 2 385 5956; e-mail y.zhao@unsw.edu.au.
Andrey V. Chubukov, David Pines, and Branko P. Stojkovic, "Temperature Crossovers in Cuprates." Contact Branko P. Stojkovic, Department of Physics, University of Illinois, Urbana, IL 61801; telephone (217) 2446242; telefax (217) 244-7559; e-mail branko@uiuc.edu; preprint also available at cond-mat@xxx.lanl.gov (#9606208).
M. Covington and L. H. Greene, "Planar Tunneling in Y1-xPrxBa2Cu3O7 as a Function of Crystallographic Orientation." Submitted to Phys. Rev. Lett. Contact L. H. Greene, Department of Physics, Loomis Laboratory of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, IL 61801-3080; telephone (217) 333-7315; telefax (217) 244-7187; e-mail lhg@uiuc.edu. 74.50.+r; 74.72.-h; 74.25.Fy.
Manfred Daeumling, "Spatial Distribution of Transport Current in Low and Self Field in BSCCO Tapes." Presented at the Appl. Supercond. Conf. (ASC'96), Pittsburgh, PA, Aug. 25-30, 1996. Forschungszentrum Karlsruhe, Institut fuer Technische Physik, D-76021 Karlsruhe, GERMANY; e-mail manfred.daumling@itp.fzk.de.
Pavel Diko, Thomas Klupsch, Insa Sonntag, Thorsten Strasser, Thobias Habisreuther, Wolfgang Gawalek, and Peter Gornert, "Microstructure, Grain Orientation and Trapped Field Profile of Multigrain Melt-Grown YBaCuO Sample." Presented at the 5th World Congress on Superconductivity, Budapest, Hungary, July 7-11, 1996. To be published in J. Microstructures & Superlattices. Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04353 Kosice, SLOVAKIA; e-mail dikos@rs530h.iepsaske.sk.
Pavel Diko, Volker R. Todt, Dean J. Miller, and Kenneth C. Goretta, "Domain Structure and Y2BaCuO5 Distribution in Single- and Multiple Domain Melt-Textured YBaCuO." Presented at the 5th World Congress on Superconductivity, Budapest, Hungary, July 7-11, 1996. To be published in J. Microstructures & Superlattices. Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04353 Kosice, SLOVAKIA; e-mail dikos@rs530h.iepsaske.sk.
S.-L. Drechsler, J. Malek, and H. Eschrig, "Exact Diagonalization Study of the Hole Distribution in CuO3 Chains Within the Four-Band dp-Model." Institut fuer Festkoerper- und Werkstofforschung Dresden e.V., Postfach, D-01171 Dresden, GERMANY. 31.25.Qm; 61.46.+w; 71.28.+d; 74.25.Jb; 74.72.Bk.
T. Egi, J. G. Wen, K. Kuroda, H. Mori, H. Unoki, and N. Koshizuka, "Field-Induced Pinning Effect of Nd(Ba1-x,Ndx)2Cu3O7-d Single Crystals Grown by the Traveling-Solvent Floating-Zone Method." 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; telephone +81 3 3536-5703 through -5705; telefax +81 3 3536-5714 or -5717. Key words: NdBa2Cu3O7-d single crystal, peak effect, pinning center, high critical current density, substitution.
P. Fabbricatore, C. Priano, A. Sciutti, G. Gemme, R. Musenich, R. Parodi, F. Goemoery, and J. R. Thompson, "Flux Pinning in Bi-2212/Ag Based Wires and Coils." To be published in Phys. Rev. B. Istituto Nazionale di Fisica Nucleare, Sezione di Genova, Via Dodecaneso 33, I16146 Genova, ITALY; telephone +39 10 353 6340; telefax +39 10 313 358; e-mail fabbric@ge.infn.it.
D. T. Fuchs, R. A. Doyle, E. Zeldov, D. Majer, W. S. Seow, R. J. Drost, T. Tamegai, S. Ooi, M. Konczykowski, and P. H. Kes, "Resistive Evidence for Vortex-Lattice Sublimation in Bi2Sr2CaCu2O8." Department of Condensed Matter Physics, The Weizmann Institute of Science, Rehovot 76100, ISRAEL. 74.25.Dw; 74.25.Fy; 74.60.Ge; 74.72.Hs.
Y. Fukumoto, H. J. Wiesmann, M. Suenaga, and P. Haldar, "Comparison of Magnetically Induced and Transport Current ac Losses in Silver-Sheathed (Bi,Pb)2Sr2Ca2Cu3O10 Tapes." To be published in Physica C (in press). Contact M. Suenaga, Department of Applied Science, Brookhaven National Laboratory, Upton, NY 11973; telefax (516) 344-4071; e-mail mas@bnlux1.bnl.gov. Key words: critical current density, flux pinning, applications of high-Tc superconductors.
R. Gerber, T. Nissel, H.-G. Wener, A. Willmann, and R. P. Huebener, "Liquid Nitrogen Cooled Sample Stage for Scanning Electron Microscopy Using a Superconducting YBa2Cu3O7-d Shield." To be published in Cryogenics. Physikalisches Institut, Lehrstuhl Experimentalphysik II, Universitaet Tuebingen, Morgenstelle 14, D-72076 Tuebingen, GERMANY; telephone +49 7071 29 76320; telefax +49 7071 29 6322; e-mail gerber@brahms.pit.physik.uni-tuebingen.de.
Y. Gim, A. Mathai, R. C. Black, A. Amar, and F. C. Wellstood, "Symmetry of the Phase of the Order Parameter in YBa2Cu3O7-d." Manuscript #6.1100; to be published in Schegolev Memorial Vol. of J. de Physique I. Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, MD 20742-4111; telephone (301) 405-7581; telefax (301) 314-9541; e-mail yggim@squid.umd.edu. 74.50.+r; 74.20.Mn; 74.72.Bk.
I. K. Gopalakrishnan and J. V. Yakhmi, "Irreversibility Line of Tl Monolayer Superconductor TlBaSrCaCu2O7." To be published in Phil. Mag. B. Chemistry Division, Bhabha Atomic Research Center, Bombay 400 085, INDIA; J. V. Yakhmi's telephone +91 22 556-9339 or -3060, Ext. 2232; telefax +91 22 556-0750 or -0534; e-mail yakhmi@magnum.barct1.ernet.in.
D. P. Grindatto, B. Hensel, G. Grasso, H.-U. Nissen, and R. Fluekiger, "TEM Study of Twist Boundaries and Colony Boundaries in (Bi,Pb)2Sr2Ca2Cu3Ox Silver-Sheathed Tapes." To be published in Physica C. Laboratorium fuer Festkoerperphysik, HPF D13, ETH Hoenggerberg, CH8093 Zurich, SWITZERLAND; telephone +41 1 633 2263; telefax +41 1 633 1077; e-mail grindatto@solid.phys.ethz.ch. Key words: (Bi,Pb)2Sr2Ca2Cu3Ox, transmission electron microscopy (TEM), grain boundaries, superconducting tape, critical current density.
J. Groth, C. Reichhardt, C. J. Olson, Stuart Field, and Franco Nori, "Vortex Plastic Motion in Twinned Superconductors." Department of Physics, University of Michigan, 500 E. University Ave., Ann Arbor, MI 48109-1120; preprint also available at cond-mat@xxx.lanl.gov (#9607182). 74.60.Ge.
R. A. Gunasekaran, B. Hellebrand, and P. L. Steger, "Crystal Structure, Oxygen Stoichiometry and Superconducting Properties of GdBa2-xSrxCu3O7-d (0.0 <= x <= 1.6)." To be published in Physica C (in press). Angewandte Physik, Johannes-Kepler Universitaet, A-4040 Linz, AUSTRIA; telefax +43 732 2468 9242; e-mail a.gunasekaran@jk.uni.linz.ac.at.
T. Haage, H.-U. Habermeier, and J. Zegenhagen, "Periodic Step Structure of Clean and YBa2Cu3O7-d-Covered Vicinal SrTiO3 (001) Surfaces." To be published in Surface Sci. Lett. Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstr. 1, D-70569 Stuttgart, GERMANY; telephone +49 711 68 9-0; telefax +49 711 6 89 1010; e-mail haage@servix.mpi-stuttgart.mpg.de. Key words: scanning tunneling microscopy, growth, surface structure, morphology, roughness, topography, SrTiO3, YBa2Cu3O7-d, superconducting films. 68.55.Jk, 74.76.Bz, 81.15.Fg.
Masahiko Hayashi and Hideo Yoshioka, "Topological Dislocations and Mixed State of Charge Density Waves." To be published in Phys. Rev. Lett. 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. 71.45.Lr.
Takashi Hikihara and George Isozumi, "Modeling of Lateral ForceDisplacement Hysteresis Caused by Local Flux Pinning." To be published in Physica C (in press). Department of Electrical Engineering, Kansai University, Yamate-cho 3-3-35, Suita, Osaka 564, JAPAN; telefax +81 6 388 8843; e-mail hikihara@ipcku.kansai-u.ac.jp. Key words: high-Tc superconductor, lateral force-displacement hysteresis, hysteresis model, flux pinning, drift.
M. Houssa and M. Ausloos, "Influence of a Magnetic Field on the Thermal Conductivity of d-wave High-Tc Superconductors." To be published in J. Phys. C. S.U.P.R.A.S., Institut de Physique B5, Universite de Liege, Sart-Tilman, B-4000 Liege, BELGIUM; telefax +32 41 66 2990; e-mail houssa@gw.unipc.ulg.ac.be. 74.25.Fy; 74.60.Ec; 74.72.Bk.
A. Ignatiev, Q. Zhong, P. C. Chou, X. Zhang, J. R. Liu, and W. K. Chu, "Large Jc Enhancement by Ion-Irradiation for Thick YBCO Films Prepared by Photo-Assisted MOCVD." Preprint #96:104; submitted to Appl. Phys. Lett. Texas Center for Superconductivity, University of Houston, Houston, TX 77204-5932; telephone (713) 743-8200; telefax (713) 7438201; e-mail preprints@www.tcs.uh.edu.
S. T. Johnson and P. D. Hatton, "An in situ X-ray Scattering Study of High-Temperature Structural Changes in Bi2Sr2CaCu2O8+d." To be published in Physica C (in press). Department of Physics and Astronomy, University of Edinburgh, Kings Buildings, Edinburgh EH9 3JZ, Scotland, UNITED KINGDOM; telefax +441 131 662 4712; e-mail stj@castle.ed.ac.uk. Key words: x-ray diffraction, structure of Bi2Sr2CaCu2Od, modulated structures, oxygen vacancies, structural phase transformation.
W. N. Kang, S. H. Yun, J. Z. Wu, and D. H. Kim, "Scaling Behavior and Mixed-State Hall Effect in Epitaxial HgBa2CaCu2O6+d Thin Films." To be published in Phys. Rev. B. Department of Physics and Astronomy, University of Kansas, Lawrence, KS 66045. 74.60.Ge; 72.15.Jf; 74.72.Gr.
K. Karpinska, A. Malinowski, Marta Z. Cieplak, S. Guha, S. Gershman, G. Kotliar, T. Skoskiewicz, W. Plesiewicz, M. Berkowski, and P. Lindenfeld, "Magnetic-Field Induced Superconductor-Insulator Transition in the La2xSrxCuO4 System." To be published in Phys. Rev. Lett. Institute of Physics, Polish Academy of Sciences, PL-02 668 Warsaw, POLAND; P. Lindenfeld's telephone at Piscataway, NJ (908) 445-2536; telefax (908) 445-4343; e-mail lindenf@physics.rutgers.edu. 74.72.Dn; 74.76.Bz; 74.20.Mn; 74.60.Ec; 74.25.Fy.
Mukul Kelkar, Patrick E. Phelan, and Bei Gu, "Thermal Boundary Resistance for Thin-Film High-Tc Superconductors at Varying Interfacial Temperature Drops." To be published in Int. J. Heat and Mass Transfer. Contact Patrick E. Phelan, Department of Mechanical and Aerospace Engineering, Arizona State University, P.O. Box 876106, Tempe, AZ 852876106; telephone (602) 965-1625; telefax (602) 965-1384; e-mail phelan@asu.edu.
Ivan Kupcic, Slaven Barisic, and Eduard Tutis, "The EFG Analysis of La2CuO4 and YBa2Cu3O7 Based Superconductors." Manuscript #6.1172; to be published in Schegolev Memorial Vol. of J. de Physique I. Contact Eduard Tutis, Institute of Physics of the University, POB 304, Zagreb, CROATIA; telephone and telefax +385 1 430 432; e-mail edo@ifs.hr. 76.60.-k; 74.72.Bk; 74.72.Dn.
L. A. Kushch, S. V. Konovalikhin, L. I. Buravov, A. G. Khomenko, G. V. Shilov, K. Van, O. A. Dyachenko, E. B. Yagubskii, C. Rovira, and E. Canadell, "Stable Molecular Metal [Pd(dddt)2]Ag1.54Br3.50: Synthesis, Crystal Structure, Transport Properties and Electronic Band Structure." Manuscript #6.1040; to be published in Schegolev Memorial Vol. of J. de Physique I. Contact E. Canadell, Institut de Ciencia de Materials de Barcelona (CSIC), Campus de la UAB, ES-08193 Bellaterra, SPAIN; telephone +34 3 580 18 53; telefax +34 3 580 57 29; e-mail canadell@zas.qf.ub.es. 71.20.Be; 72.15.Eb; 61.66.Hq.
T. Le Bihan, G. Andre, F. G. Aliev, H. Noel, Yu. K. Gorelenko, V. V. Moshchalkov, and Y. Bruynseraede, "Magnetic Structure of Antiferromagnetic Superconductor Tb2Mo3Si4." To be published in Physica C (in press). Contact F. G. Aliev, Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven, B-3001, Leuven, BELGIUM; telefax +32 16 327983; e-mail aliev.farkhad@fys.kuleuven.ac.be. Key words: magnetic order, superconductivity.
Pascal Lederer, "The Quantum Hall Effect of Field Induced Spin Density Wave Phases: The Physics of the Ultra Quantum Crystal." Manuscript #6.1115; to be published in Schegolev Memorial Vol. of J. de Physique I. Laboratoire de Physique des Solides, Universite Paris-Sud, Batiment 510, F-91405 Orsay Cedex, FRANCE; telephone +33 1 69 41 67 50; telefax +33 1 69 41 60 86; e-mail pascal@sorlt.lps.u-psud.fr. 72.15.Nj; 73.40.Hm; 75.30.Fv.
B. Lehndorff, H. Piel, M. Hortig, G. W. Schulz and R. Theisejans, "Microstructural Analysis of BSCCO-2212 Wires for Magnet Application." Presented at the Appl. Supercond. Conf. (ASC'96), Pittsburgh, PA, Aug. 25-30, 1996; submitted to IEEE Trans. Appl. Supercond. Institute of Material Science, Dept. of Physics, Bergische Universitaet Wuppertal, D42097 Wuppertal, GERMANY. Key words: BSCCO-2212 wire, phase formation, cryogen-free magnet.
Beate Lehndorff, Bernhard Fischer, Michael Hortig, Jens Mueller, Helmut Piel, and Rainer Theisejans, "Critical Current Anisotropy and Vortex Glass Scaling in Silver Sheathed BBSCCO-2212 Wires and BSCCO-2223 Tapes." Submitted to Adv. in Supercond. Institute of Material Science, Dept. of Physics, Bergische Universitaet Wuppertal, D-42097 Wuppertal, GERMANY. Key words: BSCCO-2212 wires, BSCCO-2223 tapes, powder-intube, I/U-characteristics, vortex-glass scaling.
Beate Lehndorff, Hans-Gerd Kuerschner, Bernhard Luecke, and Alan M. Portis, "The Physics of Superconducting Levitation." Submitted to Adv. in Supercond. Institute of Material Science, Dept. of Physics, Bergische Universitaet Wuppertal, D-42097 Wuppertal, GERMANY. Key words: melt-textured YBa2Cu3O7-d superconductor, YBa2Cu3O7-d films, levitation force, vertical magnetic stiffness, model calculations.
Konstantin K. Likharev, "Ultrafast Superconductor Digital Electronics: RSFQ Technology Roadmap." Presented at the XXI Int. Conf. on Low Temperature Phys. (LT21), Prague, Czech Republic, Aug. 8-14, 1996. Department of Physics, State University of New York, Stony Brook, NY 11794-3800; telephone (516) 632-8159; telefax (516) 632-8774; e-mail klikharev@ccmail.sunysb.edu.
V. M. Loktev and S. G. Sharapov, "Bose Fluctuations and Paramagnetic Susceptibility of 2D Metal with Attraction Between Carriers: Spin Gap?" Preprint #ITP-96-11R; submitted to Low Temp. Phys. Bogolyubov Institute for Theoretical Physics, Kiev 143, 252143, UKRAINE; e-mail vloktev@gluk.apr.org.
E. B. Lopes, M. J. Matos, R. T. Henriques, M. Almeida, and J. Dumas, "Charge Density Wave Dynamics in Quasi-One Dimensional Molecular Conductors: A Comparative Study of (Per)2M(mnt)2 with M=Au,Pt." Manuscript #6.1104; to be published in Schegolev Memorial Vol. of J. de Physique I. Contact Jean Dumas, Laboratoire d'Etudes des Proprietes Electroniques des Solides, CNRS, B.P. 166, F-38042 Grenoble Cedex 9, FRANCE; telephone +33 76 88 74 60; telefax +33 76 88 79 88; e-mail dumas@lepes.polycnrs-gre.fr. 71.45.Lr; 72.15.Nj; 72.20.Ht.
LU Jing and ZHANG Li-yuan, "Two Component Superconductivity for Doped Fullerenes." To be published in Mod. Phys. Lett. B. Contact ZHANG Liyuan, Department of Physics, Peking University, Beijing 100871, PEOPLE'S REPUBLIC OF CHINA; telephone +86 1 627 523 69. 74.20.-z; 74.70.Wz.
LU Jing, ZHANG Li-yuan, and FENG Xiao-bing, "Effects of Pairing Correlations on the Korringa Relation in Doped Fullerenes." To be published in Chin. Phys. Lett. Contact ZHANG Li-yuan, Department of Physics, Peking University, Beijing 100871, PEOPLE'S REPUBLIC OF CHINA; telephone +86 1 627 523 69. 71.27.+a; 76.60.-k; 76.60.Cq.
LUO Hongmei, CHEN Zuyao, and LI Rukang, "New Cuprates with the 1222 Structure: (Ce,M)Sr2(Gd,Ce)2Cu2Oy (M=Zn,Ni)." To be published in Physica C (in press). Department of Applied Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, CHINA.
R. B. Lyubovskii, R. N. Lyubovskaya, and O. A. Dyachenko, "Physical Properties of Some ET-Based Organic Metals and Superconductors with Mercury Containing Anions." Manuscript #6.1097; to be published in Schegolev Memorial Vol. of J. de Physique I. Institute of Chemical Physics RAS, Chernogolovka, Moscow Region 142432, RUSSIA; e-mail rustem@icp.ac.ru. 72.15.Gd; 74.70.Kn.
R. B. Lyubovskii, S. I. Pesotskii, A. Gilevski, and R. N. Lyubovskaya, "Shubnikov-de Haas Oscillations in New Organic Conductors (ET)8[Hg4Cl12(C6H5Cl)2] and (ET)8[Hg4Cl12(C6H5Br)2]." Manuscript #6.1096; to be published in Schegolev Memorial Vol. of J. de Physique I. Institute of Chemical Physics RAS, Chernogolovka, Moscow Region 142432, RUSSIA; e-mail rustem@icp.ac.ru. 72.15.Gd; 74.70.Kn.
Kazumi Maki and Hyekyung Won, "Why d-wave Superconductivity?" Manuscript #6.1162; to be published in Schegolev Memorial Vol. of J. de Physique I. Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089-0484; e-mail physdept@usc.edu.
Jiri Maly, K. Levin, and D. Z. Liu, "Coulomb Correlations and Pseudo-Gap Effects in a Pre-Formed Pair Model for the Cuprates." Submitted to Phys. Rev. B. James Franck Institute, University of Chicago, Chicago, IL 60637.
J. T. Markert, K. Mochizuki, and A. V. Elliott, "Infinite-Layer, T'Phase, and 1-D-Ladder Copper Oxide Compounds." Presented at the Int. Conf. on Physics and Chemistry of Molecular and Oxide Superconductors (MOS'96), Karlsruhe, Germany, Aug 2-6, 1996; to be published in J. Low Temp. Phys. Department of Physics, University of Texas, Austin, TX 78712-1081; telephone (512) 471-1153. 74.62.Dh; 74.25.Ha; 74.72.Jt.
E. Martinez, L. A. Angurel, J. C. Diez, F. Lera, and R. Navarro, "Magnetic Relaxation of Highly Textured Bi2Sr2CaCu2O8+d Polycrystalline Fibers." To be published in Physica C (in press). Contact L. A. Angurel, I.C.M.A., Departamento de Ciencia y Tecnologia de Materiales y Fluidos, Centro Politecnico Superior, Universidad de Zaragoza; C/Maria de Luna 3, 50015 Zaragoza, SPAIN; telephone +34 76 761 958 or -000, ext 5140; telefax +34 76 761 957; e-mail luis_a_angurel@mcps.unizar.es. Key words: BSCCO, magnetic relaxation, superconductivity.
O. Martinez, J. Jimenez, P. Martin, A. C. Prieto, S. Degoy, D. Chambonnet, C. Belouet, S. Nicoletti, and L. Correra, "A Micro Raman Study of the Structural Properties of PLD High Tc Superconducting Thin Films." To be published in Physica C (in press). Contact J. Jimenez, Fisica de la Materia Condensada, ETSII and Facultad de Ciencias, 47011 Valladolid, SPAIN; telefax +34 83 42 3192; e-mail jimenez@hp9000.cpd.uva.es.
J. McDonald, John R. Clem, and D. E. Oates, "Critical-State Model for Harmonic Generation in a Superconducting Microwave Resonator." A512 Physics, Department of Physics, Iowa State University, Ames, IA 50011; telephone (515) 294-9361; e-mail mrjinx@iastate.edu.
A. Mogro-Campero, P. J. Bednarczyk, Y. Gao, R. B. Bolon, J. E. Tkaczyk, and J. A. DeLuca, "Critical Current Density and Microstructure of 7-8 micrometer Thick Spray Pyrolyzed Films of TlBa2Ca2Cu3Oy." To be published in Physica C (in press). GE Research and Development Center, Schenectady, NY 12301; telefax (518) 387-7563. Key words: applications of high-Tc superconductors, critical current density, thick films.
M. A. Moore, "Is there a Phase Transition to the Flux Lattice State?" Submitted to Phys. Rev. Lett. Department of Physics, University of Manchester, Manchester, M13 9PL, UNITED KINGDOM; e-mail m.a.moore@man.ac.uk. 74.60.Ge; 74.20.De.
Keizo Murata, "Hall Effect Anomalies and Phase Transitions in the Organic Superconductors, kappa-(BEDT-TTF)2Cu(NCS)2 and beta-(BEDTTTF)2I3." Manuscript #6.1103; to be published in Schegolev Memorial Vol. of J. de Physique I. Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba Ibaraki 305, JAPAN; telephone +81 298 58 5382; telefax +81 298 58 5187; e-mail k.murata@etl.go.jp. 74.70.Kn; 72.15.Lh; 72.15.Eb.
Akira Ono, "Large Critical-Temperature Depression in Ga-1212 Cuprate Ba2YCu2.85Ga0.15Oz by Annealing at High Pressures of Oxygen." To be published in Physica C (in press). National Institute for Research in Inorganic Materials, 1-1 Namiki, Tsukuba 305, JAPAN; telefax +81 298 52 7449; e-mail ono@nirim.go.jp. Key words: high oxygen pressure, Ga1212, substitution, CuO2 sheet; Tc depression.
A. Oota, T. Fukunaga, and T. Ito, "ac Transport Losses in Ag Sheathed (Bi,Pb)2Sr2Ca2Cu3Ox Tapes." To be published in Physica C (in press). Toyohashi University of Technology, Tempaku-cho, Toyohashi, Aichi 441, JAPAN; telefax +81 532 44 6732; e-mail oota@eee.tut.ac.jp. Key words: Bi2223, Ag-sheathed tape, multifilamentary tape, twist, ac transport losses, self-fields. 74.60.Ge; 74.60.Jg; 74.70.-b.
J. A. Parrell, D. C. Larbalestier, G. N. Riley, Jr., Q. Li, R. D. Parrella, and M. Teplitsky, "Enhancement of the 77 K Irreversibility Field and Critical Current Density of (Bi,Pb)2Sr2Ca2Cu3Ox Tapes by Manipulation of the Final Cooling Rate." To be published in Appl. Phys. Lett. Applied Superconductivity Center and Materials Science Program, University of Wisconsin, Madison, WI 53706; web site http://www.cae.wisc.edu/~parrell.
D. Pelloquin, V. Hardy, and A. Maignan, "Single Crystals of the n=2 and 3 Superconductor Members Hg0.8Bi0.2Ba2Can-1CunO2n+2+d: Synthesis and Characterization." To be published in Phys. Rev. B. Contact A. Maignan, Laboratoire CRISMAT, ISMRA et Universite de Caen, URA 1318 associee au CNRS, Bd. du Marechal Juin, F-14050 Caen Cedex, FRANCE; email physol@crismat.ismra.fr. 61.10.My; 74.60.Ge; 81.10.Fq.
T. Plackowski, "Analysis of the Specific Heat Jump at Tc for SmBa2Cu3O7d." Submitted to Proc. of NATO Advanced Research Workshop, Trieste, Italy, Aug. 5-8, 1996. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 937, PL-50-950 Wroclaw 2, POLAND; telephone +48 71 35021, ext. 278; telefax +48 71 441029; e-mail plackow@highscreen.int.pan.wroc.pl.
V. Yu. Pomjakushin, A. A. Zakharov, A. Amato, V. N. Duginov, F. N. Gygax, D. Herlach, A. N. Ponomarev, and A. Schenck, "Study of Microscopic Phase Separation in La2CuO4+y by muSR." Submitted to Physica C (in press). Joint Institute for Nuclear Research, Dubna H.P.O. Box 79, 101000 Moscow, RUSSIA.
Kevin G. Ressler, Neville Sonnenberg, and Michael J. Cima, "The Development of Biaxial Alignment in YSZ Films Fabricated by Dual Ion Beam Deposition." Submitted to J. Am. Ceram. Soc. Ceramics Processing Research Laboratory, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139-4307. Michael J. Cima's telephone (617) 253-6877; telefax (617) 258-6936.
Kevin G. Ressler, Neville Sonnenberg, and Michael J. Cima, "The Mechanism of Biaxial Alignment of Oxide Thin Films During Ion Beam Assisted Deposition." Submitted to J. Am. Ceram. Soc. Ceramics Processing Research Laboratory, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139-4307. Michael J. Cima's telephone (617) 253-6877; telefax (617) 258-6936.
C. Rial, E. Moran, M. A. Alario-Franco, U. Amador, and N. H. Andersen, "On the Structural Properties and Superconductivity of Room-Temperature Chemically Oxidized La2-xBaxCuO4+y (0<=x<=0.15)." To be published in Physica C (in press). Contact U. Amador, Lab. Difraccion Rayos-X, F.C.C. Quimicas, Universidad Complutense, E-28040 Madrid, SPAIN; telefax +34 1 394 42 84. Key words: La2-x BaxCuO4+y, superconductor, neutron diffraction, phase transition, oxygen stoichiometry.
Marlyse Roulin, Alain Junod, Andreas Erb, and Eric Walker, "Melting of the Flux Line Lattice Observed by Specific Heat Experiments in YBa2Cu3O7-d." To be published in J. Low Temp. Phys.: Proc. of the Int. Conf. on Phys. and Chem. of Molecular and Oxide Supercond. (MOS'96), Karlsruhe, Germany, Aug. 2-6, 1996. Departement de Physique de la Matiere Condensee, Universite de Geneve, CH-1211 Geneve 4, SWITZERLAND. 74.25.Bt; 74.60.Ge; 74.72.Bk.
A. Sacuto, N. Bontemps, P. Monod, R. Combescot, V. Viallet, and D. Colson, "Symmetry of the Superconducting Gap in HgBa2CaCu2O6+d Single Crystals from Electronic Raman Scattering." Submitted to Phys. Rev. Lett. Laboratoire de Physique des Solides, Universite Pierre et Marie Curie, Tour 13, E-2, Case 79, 4, Place Jussieu, F-75252 Paris Cedex 05, FRANCE; telefax: +33 1 44 27 45 41; e-mail alsa@physique.ens.fr. 74.25.Gz; 74.72.Jt; 78.30.Er.
R. Scharnweber and M. Schilling, "A New Concept for Integrated YBa2Cu3O7 Magnetometers." Presented at the Appl. Supercond. Conf. (ASC'96), Pittsburgh, PA, Aug. 25-30, 1996. Institut fuer Angewandte Physik und Zentrum fuer Mikrostrukturforschung, Universitaet Hamburg, Jungiusstrasse 11, D-20355 Hamburg, GERMANY; telephone +49 40 4123 2032; telefax +49 40 4123 4368; e-mail scharnweber@physnet.uni-hamburg.de.
I. F. Schegolev, N. N. Kolesnikov, V. N. Kopylov, T. G. Togonidze, and O. M. Vyaselev, "On a Possible Reason of Tc Suppression with Oxygen Doping in Tl2Ba2CuO6+x." Manuscript #6.1084; to be published in Schegolev Memorial Vol. of J. de Physique I. Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow District, 142432, RUSSIA; telefax +7 096 576 4111; e-mail vyasel@issp.ac.ru. 74.25.Ha; 74.25.Nf; 74.62.Dh.
M. Schilling, "Electrical and Noise Properties of YBa2Cu3O7 Ramp-Type Josephson Junctions." Presented at the Appl. Supercond. Conf. (ASC'96), Pittsburgh, PA, Aug. 25-30, 1996. Institut fuer Angewandte Physik und Zentrum fuer Mikrostrukturforschung, Universitaet Hamburg, Jungiusstrasse 11, D-20355 Hamburg, GERMANY; telephone +49 40 4123 3629; telefax +49 40 4123 4368; e-mail schilling@physnet.uni-hamburg.de.
M. Schilling, S. Krey, and R. Scharnweber, "Biomagnetic Measurements with an Integrated YBa2Cu3O7 Magnetometer in a Hand-Held Cryostat." To be published in Appl. Phys. Lett. Institut fuer Angewandte Physik und Zentrum fuer Mikrostrukturforschung, Universitaet Hamburg, Jungiusstrasse 11, D-20355 Hamburg, GERMANY; telephone +49 40 4123 3629; telefax +49 40 4123 4368; e-mail schilling@physnet.uni-hamburg.de. 74.50.+r; 74.72.Bk; 85.25.Dq; 87.40.+w.
S. Sengupta, J. Corpus, J. R. Gaines, Jr., V. R. Todt, X. F. Zhang, D. J. Miller, C. Varanasi, and P. J. McGinn, "Fabrication and Characterization of Melt-Processed YBCO." Superconductive Components, 1145 Chesapeake Avenue, Columbus, OH 43212.
J. B. Shi, "Superconductivity and Magnetism of (Hg0.7Bi0.3)Sr2(Ca1xRx)Cu2O6+d System (R =Gd,Nd and Y)." To be published in Physica C (in press). Department of Electronic Engineering, Feng Chia University, Taichung, 407, TAIWAN; telefax +886 4 4510405; e-mail ece_shi@fcu.edu.tw.
S. Stassen, A. Rulmont, M. Ausloos, and R. Cloots, "Interdiffusion Between SrCuO2 and a Glassy Precursor: Toward the Understanding of the Mechanism of Formation of Bi Based 2223 Superconducting Bulk Ceramics." To be published in Physica C (in press). S.U.P.R.A.S., Chemistry Institute B6, Sart-Tilman, University of Liege, B-4000 Liege, BELGIUM; telefax +32 41 66 34 13; e-mail s871878@student.ulg.ac.be.
U. Staub, "Comment on 'Local Magnetism and Crystal Fields of Pr in PrBa2Cu3O7 Studied by [141]^Pr NMR.'" To be published in Phys. Rev. Lett. Swiss Light Source Project, Paul Scherrer Institute, CH-5232 Villigen PSI, SWITZERLAND; telephone +41 56 310 4494; telefax +41 56 310 3151; e-mail urs.staub@psi.ch.
Branko P. Stojkovic and David Pines, "A Theory of the Longitudinal and Hall Conductivities of the Cuprate Superconductors." Department of Physics and Materials Research Laboratory, 1110 West Green Street, University of Illinois, Urbana, IL 61801; telephone (217) 244-6242; telefax (217) 244-7559; e-mail branko@uiuc.edu.
R. Swietlik, A. Lapinski, L. A. Kushch, and E. B. Yagubskii, "Electronic and Vibrational Spectra of Et4N[Au(dmit)2TCNQ] Crystals." Manuscript #6.1025; to be published in Schegolev Memorial Vol. of J. de Physique I. Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, PL-60-179 Poznan, POLAND; telefax +48 61 684 524; email swietlik@ifmpan.poznan.pl. 78.30.Jw; 78.40.Me.
Kimihito Tagaya, Takayuki Yokoo, Takahiro Shibayama, Nobuo Fukuoka, L. Cohen, and A. D. Caplin, "Microwave Magnetoabsorptions of ErBa2Cu3Oy and HoBa2Cu3Oy Single Crystals." To be published in Physica C (in press). Department of Materials Science, University of Osaka Prefecture, Sakai, Osaka 593, JAPAN; telefax +81 722 55 2981; e-mail tagaya@cias.osakafu-u.ac.jp. Key words: microwave absorption, ErBa2Cu3Oy, HoBa2Cu3Oy, lower-critical field H_[c1], superparamagnetism.
Arthur Tauber, Steven C. Tidrow, Robert D. Finnegan, and William D. Wilber, "High Critical Temperature Superconductor Substrate and Buffer Layer Compounds, A2MeSbO6 (Where A=Ba and Sr; and Me=Sc, In and Ga)." U.S. Army Research Laboratory (ARL), Physical Sciences Directorate, Fort Monmouth, NJ 07703-5601; Steven C. Tidrow's telephone (908) 427-4422; telefax (908) 427-4758; e-mail stidrow@ftmon.arl.mil. Key words: highcritical-temperature superconductor, (HTSC), substrate, buffer, microwave equipment, Sr2MeSbO6, thin films, epitaxial growth, lattice parameter.
Arthur Tauber, Steven C. Tidrow, William D. Wilber, and Robert D. Finnegan, "New Substrate/Buffer Layer Compounds for High Temperature Superconductor Epitaxial Film Growth." Report No. ARL-TR-929. GeoCenters, Inc., 615 Hope Road, Eatontown, NJ 07703. Steven C. Tidrow's telephone (908) 427-4422; telefax (908) 427-4758; e-mail stidrow@ftmon.arl.mil. Key words: high-temperature superconductors, HTSC, microwave equipment, A4MeSb3O12 substrates, buffers, thin films, epitaxial growth.
B. ten Haken and H.H.J. ten Kate, "Lattice Deformation in an Axially Strained BiSrCaCuO/Ag Tape Conductor Investigated by X-Ray Diffraction." To be published in Physica C (in press). University of Twente, P.O. Box 217, 7500 AE Enschede, THE NETHERLANDS; telephone +31 53 4893 889; telefax +31 53 4891 099; e-mail b.tenhaken@tn.utwente.nl. Key words: superconductivity, x-ray diffraction, BiSrCaCuO, deformation, critical current, polycrystalline.
Steven C. Tidrow, Richard T. Lareau, William D. Wilber, Arthur Tauber, Donald W. Eckart, Robert L. Pfeffer, and Robert D. Finnegan, "Oxygen Diffusion Through Ytterbium-Oxide/Yttrium-Barium-Cuprate Bilayers." U.S. Army Research Laboratory (ARL), Physical Sciences Directorate, Fort Monmouth, NJ 07703-5601; telephone (908) 427-4422; telefax (908) 4274758; e-mail stidrow@ftmon.arl.mil. Key words: high-criticaltemperature superconductors, HTSC, ytterbium oxide, oxygen diffusion, bilayers.
S. C. Tidrow, A. Tauber, W. D. Wilber, R. T. Lareau, C. D. Brandle, G. W. Berstresser, A. J. Ven Graitis, D. M. Potrepka, J. I. Budnick, and J. Z. Wu, "New Substrates for HTSC Microwave Devices." U.S. Army Research Laboratory (ARL), Physical Sciences Directorate, Fort Monmouth, NJ 07703-5601; telephone (908) 427-4422; telefax (908) 427-4758; e-mail stidrow@ftmon.arl.mil.
S. C. Tidrow, A. Tauber, W. D. Wilber, R. D. Finnegan, D. W. Eckart, and W. C. Drach, "Dielectric Properties of Perovskite Antimonates." U.S. Army Research Laboratory (ARL), Physical Sciences Directorate, Fort Monmouth, NJ 07703-5601; telephone (908) 427-4422; telefax (908) 4274758; e-mail stidrow@ftmon.arl.mil.
Ayako Tokiwa-Yamamoto, Atsushi Fukuoka, Makoto Itoh, Seiji Adachi, H. Yamauchi, Keiichi Tanabe, "Thermogravimetric Study on HgBa2Can1CunO2(n+1)+d (n=1,2,3) Superconductors at Various Oxygen Partial Pressures." 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; telephone +81 3 3536-5703 through -5705; telefax +81 3 3536-5714 or -5717.
U. Trapper, D. Ihle, and H. Fehske, "Theory of Magnetic Short-Range Order for Itinerant Electron Systems." Submitted to Int. J. Mod. Phys. B. Institut fuer Theoretische Physik, Universitaet Leipzig, D-04109 Leipzig, GERMANY; preprint also available at cond-mat@xxx.lanl.gov (#9609014). 75.10.-b; 71.28.+b; 71.45.-d.
A. Vailionis, A. Brazdeikis, and A. S. Flodstroem, "Observation of Local Oxygen Displacements in CuO2 Planes Induced by a Misfit Strain in Heteroepitaxially Grown Infinite-Layer Structure Ca1-xSrxCuO2 Films." Submitted to Phys. Rev. B. Contact A. Brazdeikis, Materials Physics, Department of Physics, Royal Institute of Technology S-100 44, Stockholm, SWEDEN; telephone +46 8 790 6058; telefax +46 8 24 91 31; email audrius@matphys.kth.se.
C. P. Vlahacos, R. C. Black, S. M. Anlage, A. Amar, and F. C. Wellstood, "Near-Field Scanning Microwave Microscope with 100 micrometers Resolution." Submitted to Appl. Phys. Lett. Contact S. 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. 07.79.Fc; 07.79.-v.
N. V. Vo, S. X. Dou, and H. K. Liu, "Phase Development and Microstructural Effect of Sintering Periods on Uniaxially Pressed HighTc Bi(Pb)-2223/Ag Tapes." To be published in the Proc. of TMS Conference on High-Temperature Supercond., Warrendale, PA, Feb. 4-8, 1996. Centre for Superconducting and Electronic Materials, Institute of Materials Technology and Manufacturing, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, AUSTRALIA.
B. V. Vuchic, K. L. Merkle, P. M. Baldo, K. A. Dean, D. B. Buchholz, R.P.H. Chang, H. Zhang, L. D. Marks, "The Formation, Transport Properties and Microstructure of 45 Degree [001] Grain Boundaries Induced by Epitaxy Modification in YBa2Cu3O7-x Thin Films." To be published in Physica C (in press). Contact K. L. Merkle, Materials Science Division, Argonne National Laboratory, Argonne, IL 60439; telefax (708) 252-4798; e-mail karl.merkle@qmgate.anl.gov. Key words: grain boundaries, critical current density, electrical resistivity, HREM, thin films.
N. V. Vuong, "Hysteresis of ac-Susceptibility by Cycling an External Field H_[dc] in High-Temperature Superconductors." Joint Institute for Nuclear Research, Dubna H.P.O. Box 79, 101000 Moscow, RUSSIA.
N. V. Vuong, E. V. Raspopina, and N. A. Yakovenko, "Resintering -- A Novel Approach for Preparing Massive YBa2Cu3O7-d Ceramics." Joint Institute for Nuclear Research, Dubna H.P.O. Box 79, 101000 Moscow, RUSSIA.
Q. Wang, D. P. Almond, G. A. Saunders, S. B. Palmer, C. M. Lim, and K. C. Goretta, "Ultrasonic Studies of Textured Superconducting Bi2Sr2CaCu2O8+y in Magnetic Fields." To be published in the Proc. 11th Int. Conf. Internal Friction and Ultrasonic Attenuation in Solids. Schools of Physics and Materials Science, University of Bath, Bath, BA2 7AY, UNITED KINGDOM.
X. L. Wang, J. Horvat, H. K. Liu, and S. X. Dou, "Enhanced Flux Pinning From CuO Inclusions in Bi2Sr2CaCu2Oy Crystals." To be published in J. Appl. Phys. Centre for Superconducting and Electronic Materials, University of Wollongong, Wollongong, NSW 2522, AUSTRALIA; S. X. Dou's telephone +61 42 21 4566; telefax +61 42 21 4577; e-mail s.dou@uow.edu.au.
Fabian Wenger and Mikael Kaell, "Screened Raman Response in 2D d_[x^2y^2] wave Superconductors: Relative Intensities in Different Symmetry Channels." NEC Research Institute, 4 Independence Way, Princeton, NJ 08540; telephone (609) 951-2507; telefax (609) 951-2496; e-mail fabian@research.nj.nec.com. 74.25.Gz; 74.72.Hs; 78.30.Er.
H. Yamauchi and M. Karppinen, "Homologous Series of Layered Cuprates and Superconductivity." Presented at the Int. Symp. on Adv. in Supercond: New Materials, Critical Currents & Devices, Mumbai, India, Sept. 17-20, 1996. Materials and Structures Laboratory, Tokyo Institute of Technology, Nagatsuta, Yokohama 226, JAPAN.
Peidong Yang and Charles M. Lieber, "Nanorod-Superconductor Composites: A Pathway to High Critical Current Density Materials." Contact Charles M. Lieber, Division of Applied Sciences and Department of Chemistry, Harvard University, Cambridge, MA 02138.
V. M. Yartsev, O. O. Drozdova, V. N. Semkin, and R. M. Vlasova, "Modelling kappa-Phase Organic Conductors." Manuscript #6.1018; to be published in Schegolev Memorial Vol. of J. de Physique I. Centro de Fisica, Instituto Venezolano de Investigaciones Cientificas, Apartado 21827, Caracas 1020-A, VENEZUELA; telefax +58 2 501 1148; e-mail syartsev@pion.ivic.ve. 71.10.-w; 78.30.Jw.
V. Yu. Yushankhai, R. Hayn, and D. Ihle, "Dynamic Spin Susceptibility in the t-J Model Near to the Localized Limit." Joint Institute for Nuclear Research, Dubna H.P.O. Box 79, 101000 Moscow, RUSSIA.
Yimei Zhu and J. Tafto, "Measurement of Charge Transfer in YBa2Cu3O7 Using a Novel Electron Diffraction Method." Department of Applied Science, Brookhaven National Laboratory, Upton, NY 11973.
-------------------------------CUT HERE--------------------------------Please help us improve the newsletter by filling out the survey below. (E-mail this survey to mitra@ameslab.gov)
Which sections of the newsletter do you read most frequently?
Nota Bene every issue occasionally seldom never Technology News every issue occasionally seldom never Preprints every issue occasionally seldom never Coming Events every issue occasionally seldom never Resources every issue occasionally seldom never FYI every issue occasionally seldom never
Have you browsed our World Wide Web site? YES NO
If yes, are there any other features you would like to see at our Web site?
Have you mailed us a preprint of your work in the past year? YES NO
Any comments? Suggestions?
If you are sending a donation with your renewal, please enter dollar amount here. Thank you! U.S. $_____________
Last year, several of you wanted us to send you an invoice for a voluntary subscription. Would you like us to send you an invoice? (If NO, skip the next questions.) YES NO
If yes, for what amount? U.S. $_______________
Would you like us to automatically send you an invoice every year until you ask us to stop? YES NO
YOUR CONTRIBUTIONS--financial (checks in U.S. dollars, made out to High-Tc Update ) and scientific--ARE GREATLY APPRECIATED!
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. Telex: 269266. E-mail: MITRA@AMESLAB.GOV or MITRA@IASTATE.EDU.
Project Director/Editor: Sreeparna Mitra
Science Editor: John R. Clem
High-Tc Update, Vol. 10, #20, October 15, 1996.