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RBa2Cu3O7-d
Pulsed-neutron spectroscopy has been used by S. M. Hayden (Bristol) et al. to make absolute measurements of the dynamic magnetic susceptibility of insulating YBa2Cu3O6.15. Acoustic and optical modes, derived from in- and out-of-phase oscillations of spins in adjacent CuO2 planes, were found to dominate the spectra and were observed up to 250 meV. Linear spin-wave theory was found to give an excellent description of the data and yielded intra- and inter-layer exchange constants of J_|| = 125+-5 meV and J_[perp.] = 11+-2 meV, respectively, and a spin-wave intensity renormalization Z_[chi] = 0.4+-0.1.
Measurements of the copper isotope effect alpha_[Cu] = -Delta[lnTc]/Delta[lnm_[Cu]] for oxygen-depleted YBa2Cu3O7-d as a function of d are reported by J. P. Franck (Alberta). The author found that alpha_[Cu] is negative for all d. In the 60 K plateau, alpha_[Cu] values of -0.14 and -0.34 were found for two comparison pairs. Outside the 60 K plateau, the absolute value of alpha_[Cu] was found to increase. The author notes similarities with results on dTc/dP and suggests that alpha_[Cu] is related to mass-dependent ordering in the CuO chains.
Low-temperature thermal-expansion and specific-heat measurements in a series of nonrandom composites of YBCO/Ag x wt% (x = 6, 11, and 23) are reported by C. Haetinger (Porto Alegre) et al. A reference YBCO sample also was investigated. At the lowest temperatures, the expansivities and specific heat were analyzed as sums of an extrinsic T-linear term and a T^3-Debye contribution. The Grueneisen parameters were found to be almost constant for T >= 60 K and to be larger for composites with higher Ag content.
Using a double SQUID magnetometer, P. Pugnat (CNRS-Grenoble) et al. have simultaneously measured the angular dependence of the transverse (M_T) and longitudinal (M_L) magnetization components in a YBa2Cu3O7-d (Tc ~~ 91 K) single crystal. The angular variations of the ratio M_[Trev]/M_[Lrev] of the reversible components were measured and analyzed using the 3D anisotropic Ginzburg-Landau theory. The derived anisotropy factor gamma was found to depend on the applied field, an effect that is attributed to the field-induced reduction of the proximity effect of nonsuperconducting layers.
Two preprints by H. Kuepfer (Karlsruhe) et al. report studies of the anisotropy and field dependence of the irreversible magnetization in YBa2Cu3O7-d. At temperatures in the range 55-73 K and in fields B parallel to the CuO2 layers, the authors found (as observed by previous authors) that the irreversible magnetization exhibits a sequence of temperature-independent maxima as a function of B. These oscillations are attributed to matching (lock-in) peaks, at which the distance between adjacent planes of vortices is equal to an integral number of CuO2 bilayer lattice parameters.
Small particle sizes (1-2 micrometer) of Sm2BaCuO5 (Sm-211) were achieved by H.-W. Park (KEPRI) et al. in SmBa2Cu3O7-d (Sm-123) melttextured at oxygen pressures of 0.001 atm - 1 atm via 1 wt% CeO2 addition and size control of the precursor powder. The values of Tc, however, were below the values that have been reported previously (up to 94.5 K) for Sm-123 prepared at low oxygen pressures.
Circular and butterfly-like patterns in DyBa2Cu3O7-d (Dy-123) enriched with Dy2O3 are reported and explained by N. Vandewalle (Liege) et al. from the growth-condition hypotheses of nonseeded melt-textured growth. These hypotheses, which are confirmed via model simulations, are particle trapping and displacement along the surfaces of expanding pyramids or terraces.
Bi Cuprates
The normal-state in-plane resistivity rho_[ab] and out-of-plane resistivity rho_c in La-doped Bi2Sr2CuO6 (Bi-2201, Tc ~~ 13 K) have been measured by Y. Ando (Bell Labs) et al. by suppressing superconductivity with pulsed magnetic fields of 61 T. In the sample with the smallest rho_[ab] (133 micro-ohms-cm at 100 K), the authors found that metallic rho_[ab] coexists with semiconducting rho_c down to the lowest experimental temperature, 0.66 K (T/Tc = 0.05), thus providing evidence of the non-Fermi-liquid nature of the cuprates.
The resistivity and thermoelectric power of underdoped and overdoped samples of Bi1.8Pb0.2Sr2CuO6+d (Bi-2201) have been measured by MAO Zhiqiang et al. (Hefei). For the underdoped samples, the authors found anomalous behavior (similar to that found in underdoped samples of YBa2Cu3O7-d), which they attribute to a normal-state spin gap. The spin gap temperature increases as the oxygen content in Bi1.8Pb0.2Sr2CuO6+d decreases.
The temperature dependence of the anisotropic magnetic penetration depth lambda(T) in under- and over-doped single crystals of Bi2Sr2CaCu2O8+d (Bi-2212) has been obtained by T. Shibauchi et al. (Tokyo) from microwave surface-impedance measurements. At relatively low oxygen content, both the in-plane [lambda_[ab](T)] and out-of-plane [lambda_c(T)] penetration depths showed T-linear behavior at low temperatures, consistent with that expected for a clean d-wave superconductor. Overdoped samples, on the other hand, showed T^2 dependence in both lambda_[ab](T) and lambda_c(T), suggesting that the quasiparticle excitation spectrum changes with oxygen doping into that of a gapless state.
Surface-profile images of Bi2Sr2CaCu2O8+d (Bi-2212) have been obtained by W. Zhou (IRC-Cambridge) using high-resolution electron microscopy. The cleaved (001) surface of the crystals was found to terminate with a single BiO atomic layer. The (hk0) surfaces were found to decompose in air into an amorphous coating layer, which could be recrystallized into the original structure under electron-beam irradiation.
A preprint by M. Pekala (Warsaw) et al. reports magnetotransport measurements of Bi1.84Pb0.34Sr1.91Ca2.03Cu3.06O10+d (Bi-2223) ceramics. The authors found that the temperature percolation line depends upon whether the line is defined from electrical-resistivity or thermoelectric-power data. The authors also measured the field and temperature dependence of the electrothermal conductivity (thermoelectric power divided by resistivity) and compared their results at high temperatures (approaching Tc) with those expected for s-wave or d-wave order parameters. The results agreed with the d-wave description.
The blistering phenomenon in oxide-powder-in-tube (OPIT) (Bi,Pb)2Sr2Ca2Cu3O10+d [(Bi,Pb)-2223]/Ag composite tapes has been studied by V. Beilin et al. (Hebrew University of Jerusalem). Preliminary rolling of a blistered tape and annealing of the as-rolled tape at 500-700^oC prevented blistering during subsequent thermomechanical processing and resulted in Jcs exceeding 1 x 10^4 A/cm^2 at
A method for making high-Tc superconducting joints between Ag-clad Bi2223 tapes has been developed by K. Chen (MRL-ITRI) et al. for persistent-current applications. Two presintered tapes with one side of the silver stripped were lapped and then wrapped in silver foil. The complex was uniaxially pressed and then sintered to form a high-Tc superconducting tape joint. The authors measured I_c/I_c, the ratio of the critical current of the joint to that of the tape, as a function of the uniaxial pressure and sintering conditions. At 77 K, values of I_c/I_c = 99% and joint resistances of ~4 x 10^[-13] ohms were achieved.
A paper by B. Zeimetz et al. (Wollongong) reports that the critical current of Bi-2223/Ag tapes is improved when large (400 micrometers) silver particles are used during processing. The authors report that these particles are squeezed into long, flat layers, leading to better grain alignment, grain density, and phase purity of the 2223 phase. As a consequence, the critical current is increased by up to 60% in selffield, and by a larger factor in an applied magnetic field.
The influence of mechanical strain on the 77 K critical current density Jc of single- and multi-filament silver-sheathed Bi(Pb)-2223 superconducting tapes has been investigated by J.K.F. Yau (New South Wales) et al. The deterioration of Jc at large strain was found to be due to microstructural damage in the form of cracks.
Other Cuprates
A preprint by A. Fukuoka et al. (SRL, ISTEC) reports the synthesis of nearly single-phase HgBa2CuO4+d (Hg-1201) samples with various oxygen contents, and a systematic investigation of the relationships among the lattice parameters, the superconducting transition temperature Tc, and the oxygen content as determined by iodometry. The nominal coppervalence values were calculated from the oxygen-content data by assuming constant valence values of +2.00 for Hg and -2.00 for O. The Tc-versusCu valence curve exhibits a bell-shaped correlation with a Tc maximum at a Cu valence of +2.18.
A new oxychloride, Ba2CuO2Cl2, has been synthesized under high pressure of 6 GPa and 1000^oC by T. Tatsuki et al. (SRL-ISTEC) from BaCl2, BaO2, and Cu metal powders. Ba2CuO2Cl2 crystallizes in a tetragonal K2NiF4 structure. No superconductivity was found down to 5 K. The formal Cu valence was determined to be +1.8.
A nearly single-phase Pb-1223 sample with a nominal composition of Pb:Sr:Ca:Cu = 0.5:2.8:1.7:3.0 has been prepared by X.-J. Wu et al. (SRLISTEC) using a high-pressure technique. The sample showed superconductivity below 104 K. A micro-composition analysis by an energy dispersive x-ray (EDX) measurement indicated that the ratio of cations in the final product was Pb:Sr:Ca:Cu = 0.55:2.42:1.73:3.30.
The stability of Hg1-xBa2Can-1CunO2n+2+d [Hg-12(n-1)n] and its competing phase, HgCaO2, has been studied by Y. Y. Xue et al. (TSCUH) as a function of their equilibrium Hg vapor pressures P_[Hg] at synthesis temperatures. The authors found that the stability of Hg-12(n-1)n varies systematically with n. They also found that traces of moisture or carbon dioxide reduce the P_[Hg] of HgCaO2, and that partially substituting Re, Pb, and Mo for Hg suppresses the P_[Hg] of Hg-12(n-1)n.
The synthesis of a new barium-free mercury-based superconducting cuprate, Hg0.7V0.3Sr2-xLaxCuO4+d, is reported by J. B. Mandal (SINR, Calcutta) et al. The onset Tc of this compound is about 50 K and does not vary appreciably with x.
Anisotropy with four-fold symmetry in the ab-plane of the upper critical field in single-crystal Pb2Sr2Y0.62Ca0.38Cu3O8 is reported by Y. Koike et al. (Tohoku). The authors attribute this to anisotropy of the superconducting energy gap with d_[x^2-y^2] symmetry.
Vortices
An exact solution for the magnetic field generated by a pancake vortex near the sample surface has been obtained by R. G. Mints (Tel Aviv) et al. The authors solve for the magnetic field inside and outside the sample, which is assumed to consist of an infinite set of superconducting layers with vanishing interlayer Josephson coupling. The surface intersects the sample in a plane perpendicular to the layers. Using the principle of linear superposition, the authors calculate the stray field generated by a randomly distorted Abrikosov vortex, which is generally parallel to the sample surface and perpendicular to the layers.
A preprint by J. P. Rodriguez (Los Alamos) calculates the entropic corrections to the flux-line energy of extreme type-II superconductors using a schematic dual Villain-model description of the flux quanta. The author calculates the temperature dependence of the lower critical field and finds that H_[c1](T) vanishes as (Tc - T)^[2/3] in the isotropic case and that it exhibits an inflection point for weakly coupled superconducting layers in a parallel magnetic field. The author argues that vestiges of both these effects already have been observed in high-temperature superconductors.
A second preprint by J. P. Rodriguez (Los Alamos) addresses the decoupling of extreme type-II superconducting thin films with weakly Josephson-coupled layers in a parallel magnetic field. The author uses the frustrated XY model to describe the mixed phase in the critical regime. In the limit of weak interlayer coupling, the author finds, for arbitrary field orientations, interpenetrating parallel and perpendicular vortex lattices for low enough perpendicular field. For the double-layer case, the author computes the parallel lower critical field, including entropic effects, and finds that H_[c1] vanishes exponentially as the temperature approaches the layer decoupling transition in zero field.
Flux Penetration
Experimental and theoretical investigations of the penetration of magnetic flux into flat type-II superconductors of various shapes in an increasing perpendicular magnetic field are reported in a preprint by T. Schuster et al. (MPI-Stuttgart). The authors observed the magnetic field distribution at the sample surface by the magneto-optical Faraday effect and calculated it from first principles. The investigations were performed on DyBa2Cu3O7-d and YBa2Cu3O7-d samples that were shaped into a cross or an indented rectangle by a laser-cutting technique. The authors show that a surprisingly large concentration of magnetic flux and electric field and a high vortex velocity occur at concave sample corners. Very large jumps of the electric field occur where the current flow changes from a straight to a circular path, and the magnitude of the electric field diverges as 1/x, where x is the distance to the concave corner or sharp indent. This large electric field and related energy dissipation may be particularly relevant for superconducting tapes, in which sausaging effects reduce the tape's performance as an ideal conductor.
The field distribution in a Bi-2212 rectangular strip placed in a perpendicular magnetic field has been studied by R. I. Khasanov (Kazan) et al. using an ESR (electron-spin-resonance) microprobe scanned over the sample surface. As the temperature was varied, the authors observed a crossover of the magnetic field profile from a dome shape, which is characteristic of behavior dominated by the geometrical barrier (T > 30 K), to bulk-pinning-dominated behavior (T < 25 K). The authors also determined the temperature dependence of the lower critical field.
A preprint by S. Senoussi (Orsay) et al. reports magnetization measurements on high-quality single crystals of YBa2Cu3O7-d. The authors show that the vortex-entry and vortex-exit branches of the hysteresis cycle exhibit very different pinning and creep behaviors at low temperature near the critical state. Moreover, this asymmetry effect depends strongly on the angle theta of the applied field relative to the c axis; it is highest at theta and T close to zero and increases with the magnitude of the applied field. The authors present evidence that this is a twin-boundary effect, which is suppressed by inhomogeneities in less perfect YBCO materials.
Thin Films
A near-field resistivity microscope has been developed by M. Golosovsky et al. (Hebrew University of Jerusalem) for millimeter-wave resistivity mapping of large-area conducting films. The microscope is based on the idea that electromagnetic waves are transmitted through a narrow resonant slit with high efficiency. By scanning this slit at fixed height above an inhomogeneous conducting surface and measuring the intensity and phase of the reflected wave, the authors determine the resistivity of this surface with 10-100 micrometers spatial resolution using 80 GHz radiation. The authors have mapped the normal-state resistivity of 1 in x 1 in YBCO films at room temperature. In some films, the inhomogeneities in the normal-state sheet resistance were of the order of 10-20%.
Using a parallel-plate resonator technique, A. T. Findikoglu et al. (Los Alamos) have measured the 10 GHz microwave surface resistance R_s of YBa2Cu3O7-d films on buffered ceramic substrates and have examined the correlation between R_s and materials properties. For example, a 0.4 micrometer thick YBCO film with an in-plane mosaic spread of 7 degrees, grown on a polycrystalline alumina substrate with an ion-beam-assisteddeposited (IBAD) yttria-stabilized zirconia (YSZ) buffer layer, had an R_s of 1.89 micro-ohms at 76 K and 0.21 micro-ohms at 4 K. The authors observed a strong correlation between the R_s of the samples and the inplane mosaic spread of the YBCO films. This correlation can be explained qualitatively in terms of a model in which the weak links between the grains of a YBCO film form a network of Josephson junctions.
The average grain size, nonuniform lattice distortion, and orthorhombic lattice parameters have been measured by A. G. Zaitsev (Juelich) et al. using x-ray diffraction for a series of YBCO thin films. The films exhibited a microwave surface resistance ranging from less than 0.05 ohm to 0.8 ohm (measured at 60 GHz and 77 K) and had Tc = 89-90 K and Jc(77K,0T) > 2 x 10^6 A/cm^2. The authors found that a decrease of the orthorhombic splitting, which results from the lattice distortion in the ab plane, correlates with an increase of surface resistance. On the other hand, the perfection of the YBCO lattice along the c axis does not affect the microwave losses in these films. The microwave losses in the YBCO films also were found to be correlated with the film surface morphology.
A process combining hydrofluoric acid (HF) and Ar^+ ion milling has been used by H. Q. Li et al. (NIST-Boulder) to make YBa2Cu3O7/SrTiO3/YBa2Cu3O7 (YBCO/STO/YBCO) multilayer test circuits. Low-angle steps can be readily etched in STO and YBCO films with this process. YBCO lines crossing 5 degrees steps have about the same critical temperature Tc (89-90 K) and critical current density Jc (>1 x 10^6 A/cm^2 at 86 K) as lines on planar surfaces. Via connections have the same Tc as other circuit components and adequate critical currents for most circuit designs.
Applications
Ion-implantation inhibit patterning has been applied by D. C. DeGroot (NIST-Boulder) et al. to fabricate low-loss microwave transmission lines in high-temperature superconductor thin films. To determine the effectiveness of this technique, the authors fabricated coplanar waveguide transmission lines in YBa2Cu3O7-d thin films that had been deposited on LaAlO3 substrates using pulsed laser deposition. Microwave characterizations of these lines were compared with those of a reference line fabricated by conventional ion milling. At 76 K and 12 GHz, the attenuation constants of the ion-implanted transmission lines were approximately 0.02 dB/mm, and the overall loss response was indistinguishable from that of the ion-milled device.
The excess voltage noise in high-Tc superconducting Josephson junctions and devices has been measured by L. Hao et al. (Strathclyde). Several types of grain-boundary junctions, prepared in different ways in four separate laboratories, were fully characterized in terms of their electrical and noise properties over a range of temperatures, frequencies, and magnetic fields. Similar characterizations were carried out for multi-junction Josephson flux-flow arrays and biepitaxial SQUIDs.
A theoretical model of high-Tc Josephson field-effect transistors (JoFETs) has been developed by J. J. Betouras (Wisconsin) et al. The model is based on a Ginzburg-Landau free-energy expression whose parameters are field and spatially dependent. The authors have used this model to explain experimental data on JoFETs made with holeoverdoped Sm1-xCaxBa2Cu3O7-d bicrystal junctions (three-terminal devices).
Theory
A model for high-Tc superconductivity in which electrons are scattered by atoms in a two-level (or multi-level) potential, denoted as a tunneling unit (TU), is presented in a paper by S. B. Simanovsky and M. W. Klein (Worcester Polytechnic Institute). For YBa2Cu3O7-d, the authors suggest that the tunneling unit is associated with transitions of CuO-chain-layer oxygen atoms between asymmetric potential wells of unequal depth. Similar tunneling units have been reported in Bi2Sr2CaCu2O8+d (Bi-2212), Tl2Ba2CuO6+d (Tl-2201), Tl2Ba2CaCu2O8+d (Tl2212), and Tl2Ba2Ca2Cu3O10 (Tl-2223). The tunneling units interact via a strain-like interaction and give rise to strongly anisotropic scattering of the conduction electrons. The model produces a high Tc and a superconducting gap function Delta(k) with nodes and a combination of s-wave and d_[x^2-y^2]-wave components. The authors calculate the isotope effect exponent alpha, whose value depends on the asymmetry of two wells of the tunneling unit. With increased asymmetry, alpha becomes positive, as found experimentally. Since the superconductivity depends on the strain interaction in this model, the authors also expect Tc to be strongly pressure dependent, as observed in experiment.
A mechanism for the pseudo-spin-gap anomaly in magnetically coupled bilayer cuprates without any fermion pairing instability is proposed by J. Kishine (Tokyo). The low-energy magnetic excitations are governed mainly by the itinerant nature of the intralayer system and the interlayer antiferromagnetic coupling. No matter how weak the bare interlayer coupling is, it can be dramatically enhanced by the intralayer spin fluctuations. As the temperature decreases near the antiferromagnetic phase boundary, the strongly enhanced interlayer correlation induces interlayer particle-hole exchange scattering processes, which enhance interlayer spin-singlet formation and kill triplet formation. The author proposes that the coupling of spin fluctuations on adjacent layers via the strong repulsive interaction between parallel spins traveling on each layer gives rise to dynamical screening effects. As a result, the low-energy part of the spin excitation spectrum is strongly suppressed as the temperature decreases.
The effects of fluctuations on the ac conductivity of a layered superconductor have been studied by F. Federici and A. I. Varlamov (Firenze) as a function of frequency and temperature for both c-axis and ab-plane electromagnetic wave polarizations. The authors find that the fluctuation contributions of different physical nature and signs (paraconductivity, Maki-Thompson anomalous contribution, and oneelectron density of states renormalization) are suppressed by the external field at different characteristic frequencies. The authors predict the appearance of a nonmonotonic frequency dependence (pseudogap) in the infrared optical conductivity of high-temperature superconducting films. The effect is expected to be especially pronounced when the electric field is polarized along the c axis.
A theory of electron transport including the polaronic and magnetic exchange character of mixed-valence transition-metal oxides has been formulated by G. F. Dionne (Lincoln Laboratory). The author notes that a similarity exists between the metallic resistivity of the multivalent manganites at low temperatures and that of the superconducting cuprates. The manganites and the cuprates differ, however, in the magnetic exchange contribution to the activation energy E_[hop] for electron hopping.
Other Activities
A preprint by H. A. Blackstead (Notre Dame) and J. D. Dow (Arizona State) examines Ni- and Zn-doping data in a number of cuprates and arrives at a consistent explanation if (a) superconductivity originates in the charge-reservoir or dopant-oxygen regions of each unit cell and not in the CuO2 planes, (b) short-range exchange scattering by magnetic Ni readily breaks Cooper pairs whose holes are located on nearestneighbor oxygen ions only, (c) a longer-range interaction is responsible for the degradation of Tc by Zn and by Ni distant from the superconducting condensate, and (d) polarization fluctuations are responsible for the Cooper pairing. The authors assert that the pairbreaking data contradict not only the spin-fluctuation d-wave-pairing model, but also all models with the superconductivity originating in the CuO2 planes.
As reported by H. A. Blackstead (Notre Dame) et al., inhomogeneous superconductivity has been observed in PrBa2Cu3O7-d at 92 K in surface resistance measurements at microwave frequencies and in diamagnetism detected by ESR of trace amounts of Cu impurity spins. The observations are interpreted in terms of a model that predicts inhomogeneous superconductivity in the vicinity of CuO chain layers of small regions of PrBa2Cu3O7-d that have no Ba-site Pr.
A preprint by A. I. Romanenko (Novosibirsk State) et al. reports the use of voltammetric methods to determine that Pr is only in the three-valent state (Pr^[3+]) in PrBa2Cu3O6+x in the oxygen-content range 0.4 <= x <= 0.6 but is only in the state Pr^[4+] outside this range. The authors assert that the reason for the absence of a metallic and superconducting state in PrBa2Cu3O6+x is the presence of Pr^[4+] associated with disorder; they suggest that metallic and superconducting behavior might occur if one could remove the disorder in the PrBa2Cu3O6+x lattice.
A virtual additive magnetic moment has been observed by L. Pust et al. (Institute of Physics, Praha) in a series of YBCO thin films in an external field perpendicular to the film plane. Magnetic hysteresis loops measured by the vibrating-sample magnetometer PAR 155 up to fields of +-2 T were symmetrical at high field-sweep rates, but at low sweep rates they exhibited a large additive offset of the reversible magnetic moment. The authors identified this phenomenon as an artifact originating from vibrations of a sample possessing high differential susceptibility in a slightly inhomogeneous field.
The extraction of the antiferromagnetic (AF) exchange constants J and J' in two-leg spin-1/2 nearest-neighbor (nn) Heisenberg ladders from experimental magnetic spin-susceptibility data has been studied by D. C. Johnston (Ames Lab, Iowa State), where J' is the nn exchange constant in the rungs and J is that in the legs. The author's analysis suggests that J'/J ~ 0.5 in SrCu2O3, contrary to the expectation that J'/J ~~ 1, and that J/k_B is very large (~2000 K), similar to the value of J in the linear-chain cuprate Sr2CuO3.
Overview
A lengthy article on the two-subsystem, negative-U interpretation of high-temperature superconducting behavior in the mixed-valent squareplanar cuprate metals has been prepared by J. A. Wilson and A. Zahrir (Bristol). The authors stress that these systems are microinhomogeneous because of charge segregation, and that questions of local-moment seeding, local trapping of carriers, on-site Jahn-Teller and bonding distortions are intertwined with delocalized aspects, such as spindensity waves (SDWs), charge-density waves (CDWs), and the resonatingvalence-bond (RVB) state. The authors also note that the order parameter is composite, including s- and d-wave components (250 refs.).
Ph.D. Thesis
New synthesis processes for Bi-2212 and Bi-2223 high-Tc superconducting ceramics are described in the Liege Ph.D. thesis of S. Stassen. Included are discussions of general features about Bi-based superconducting ceramics, magnetic grain alignment in 2212 materials, nonisovalent alkaline-metal substitution in 2212 materials, 2223 materials prepared by the glassy-matrix-precursor method, and nonisovalent rare-earth substitution in 2223 materials (352 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.
Farhat Abbas, "Two-Fluid Model for Superconductors as a Quantum Statistics Approach." To be published in Physica C (in press). National Physical Laboratory, Teddington, Middlesex TW11 0LW, UNITED KINGDOM; e-mail fa@newton.npl.co.uk.
Yoichi Ando, G. S. Boebinger, A. Passner, N. L. Wang, C. Geibel, and F. Steglich, "Metallic In-Plane and Divergent Out-of-Plane Resistivity of a High-Tc Cuprate in the Zero-Temperature Limit." Submitted to Phys. Rev. Lett. Bell Laboratories, Lucent Technologies, 700 Mountain Avenue, Murray Hill, NJ 07974. 74.25.Fy; 74.20.Mn; 74.72.Hs; 71.10.Hf.
G. Balestrino, E. Milani, C. Aruta, and A. A. Varlamov, "On the Nature of the c-Axis Resistance Peak Observed Above the Critical Temperature in Layered Superconductors." To be published in Phys. Rev. B. Contact E. Milani, Dipartimento di Scienze e Tecnologie Fisiche ed Energetiche, Istituto Nazionale de Fisica Della Materia, Universita di Roma "Tor Vergata," Via della Ricerca Scientifica, I-00133 Roma, ITALY; telefax +39 6 2021351; e-mail milani@utovrm.it. 74.40.+k; 74.70.Vy; 74.75.+t.
C. D. Batista and A. A. Aligia, "Indications for RVB Superconductivity in a Generalized t-J Model for the Cuprates." To be published in Physica C (in press). Centro Atomico Bariloche and Instituto Balseiro, Comision Nacional de Energia Atomica, 8400 Bariloche, ARGENTINA; telefax +54 9444 61006; e-mail batista@cab.cnea.edu.ar. 74.20.Mn; 57.10.Jm; 75.40.Mg.
V. Beilin, A. Goldgirsh, M. Schieber, and H. Harel, "The Blistering Phenomenon in BiSCCO-2223 High Tc Superconducting Tapes." To be published in Supercond. Sci. & Technol. School of Applied Science, Hebrew University of Jerusalem, Jerusalem 91904, ISRAEL; telephone +972 2 658-6414 or -4712; telefax + 972 2 6586412; e-mail beilin@shum.cc.huji.ac.il.
Joseph J. Betouras, Robert Joynt, Zi-Wen Dong, T. Venkatesan, and Peter Hadley, "Ginzburg-Landau Theory of Josephson Field Effect Transistors." Department of Physics and Applied Superconductivity Center, University of Wisconsin-Madison, 1150 University Avenue, Madison, WI 53706.
H. A. Blackstead, John D. Dow, D. B. Chrisey, J. S. Horwitz, M. A. Black, P. J. McGinn, A. E. Klunzinger, and D. B. Pulling, "Observation of Superconductivity in PrBa2Cu3O7." Ref. No. expr341pre.rno; to be published in Phys. Rev. B. 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, PrBa2Cu3O7. 74.20.Fg; 74.70.Vy.
Howard A. Blackstead and John D. Dow, "Ni and Zn Doping of Cu Sites in Superconducting Nd2-zCezCuO4, La_[2-beta]Sr_[beta]CuO_4, Bi2Sr2CaCu2O8, Bi1.8Pb0.2Sr2Ca2Cu3O10, YBa2Cu3O7, La0.6Ca0.4Ba1.35La0.65Cu3Ox, and YBa2Cu4O8." Ref. No. nizn344pre.rno; to be published in Phil. Mag. Department of Physics, University of Notre Dame, Notre Dame, IN 46556; telephone (219) 631-7078; telefax (219) 631-5952; e-mail blackstd@rems1.phys.nd.edu. Key words: superconductivity, Zn doping, Ni doping. 74.20.Fg; 74.70.Vy.
Zeynep Celik-Butler, Pao Chuan Shan, Donald P. Butler, Agha Jahanzeb, Christine M. Travers, Witold Kula, and Roman Sobolewski, "Charge Transport in Amorphous and Tetragonal Semiconducting YBaCuO Films." Submitted to Phys. Rev. B. Department of Electrical Engineering, Southern Methodist University, P.O. Box 750338, Dallas, TX 75275-0338; e-mail zcb@seas.smu.edu.
K. Chen, C. H. Tai, and L. Horng, "Development of High-Tc Superconducting Bi-2223 Tape Joints." To be published in J. Supercond., Vol. 9, No. 3 (1996). Materials Research Laboratories, Industrial Technology Research Institute, 195-5 Chung-Hsing Rd. Sec. 4, Chutung, Hsinchu 310, Taiwan, REPUBLIC OF CHINA; telephone +886 35 91 5203; telefax +886 35 820206. Key words: Bi-2223, tape joints.
Shi Daning and Li Zheng-Zhong, "The Effect of Hybridization Disorder on the d Wave Heavy-Fermion Superconductivity." To be published in Physica C (in press). College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing, PEOPLE'S REPUBLIC OF CHINA.
D. C. DeGroot, D. A. Rudman, Kuan Zhang, Q. Y. Ma, H. Kato, and N.A.F. Jaeger, "Planar Microwave Devices Fabricated by Ion-Implantation Patterning of High-Temperature Superconductors." Division 813.00, National Institute of Standards and Technology, 325 Broadway, Boulder, CO 80303; telephone (303) 497-7212; telefax (303) 497-3970; e-mail degroot@boulder.nist.gov.
G. F. Dionne, "Anomalous Magnetoresistance in the Lanthanide Manganites and Its Relation to High-Tc Superconductivity." Technical Report No. 1029. Lincoln Laboratory, Massachusetts Institute of Technology, 244 Wood Street, Lexington, MA 02173.
S. G. Doettinger, R. P. Huebener, and S. Kittelberger, "Damping of the Vortex Motion in the Cuprate Superconductors." Submitted to the XXI Int. Conf. on Low Temperature Physics (LT 21), Prague, Czech Republic, Aug. 8-14, 1996. Physikalisches Institut, Lehrstuhl Experimentalphysik II, Universitaet Tuebingen, D-72076 Tuebingen, GERMANY.
A. V. Dotsenko and O. P. Sushkov, "Temperature Dependence of the Electron Chemical Potential in YBa2Cu3O6+d." To be published in Physica C (in press). School of Physics, University of New South Wales, Sydney 2052, AUSTRALIA; telefax +61 2 385 6060; e-mail dav@newt.phys.unsw.edu.au. Key words: superconductivity, chemical potential, chains. 71.27.+a; 74.25.Jb; 74.72.Bk.
L. A. Falkovsky and S. Klama, "Fluctuations in Coupled Electron-Phonon System and Raman Light Scattering." To be published in Physica C (in press). Contact S. Klama, Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, PL-60179, Poznan, POLAND; telefax +48 61 684 524; e-mail klama@ifmpan.poznan.pl. Key words: Raman scattering, Fano resonance, surface effect. 73.20.Mf; 74.25.-q; 78.30.-j.
Francesca Federici and Andrew Varlamov, "The Fluctuation Induced Pseudogap in the Infrared Optical Conductivity of High Temperature Superconductors." Laboratorio 'Forum' dell'Istituto Nazionale di Fisica della Materia, Dipartimento di Fisica, Universita di Firenze, Largo E. Fermi 2, I-50125 Firenze, ITALY; telephone +39 55 230751; telefax +39 55 229330; e-mail federici@fi.infn.it.
A. T. Findikoglu, S. R. Foltyn, P. N. Arendt, J. R. Groves, Q. X. Jia, E. J. Peterson, X. D. Wu, and D. W. Reagor, "Microwave Surface Resistance of YBa2Cu3O7-x Films on Polycrystalline Ceramic Substrates with Textured Buffer Layers." Submitted to Appl. Phys. Lett. Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM 87545; findik@lanl.gov. 74.76.Bz; 74.80.Dm; 85.25.Jw; 81.15.-z.
J. P. Franck, "Experimental Investigations of the Isotope Effect in High Tc Superconductors." Submitted to the Proc. of the 15th Gen. Conf. of the Condensed Mat. Div., European Physical Society, Baveno, Italy, April 22-25, 1996; to be published in Physica Scripta. Dept. of Physics, U. of Alberta, Edmonton, Alberta T6G 2J1, CANADA. 74.72.Bk; 74.62.Bf.
A. Fukuoka, A. Tokiwa-Yamamoto, M. Itoh, R. Usami, S. Adachi, H. Yamauchi, and K. Tanabe, "Dependence of Superconducting Properties on the Cu-Valence Determined by Iodometry in HgBa2CuO4+d." To be published in Physica C. Frontier Technology Research Institute, Toyko Gas Co., Ltd., 7-7, Suehiro-cho, 1-chome, Tsurumiku, Yokohama 230, JAPAN.
A. K. Ghosh, S. K. Bandyopadhyay, P. Barat, Pintu Sen, and A. N. Basu, "Fluctuation-Induced Conductivity of Polycrystalline Y1-xCaxBa2Cu3O7-d Superconductors." To be published in Physica C (in press). Contact S. K. Bandyopadhyay, Variable Energy Cyclotron Centre, 1/AF Bidhan Nagar, Calcutta-700 064, INDIA; telefax +91 33 3346871.
Michael Golosovsky, Alexander Galkin, and Dan Davidov, "High-Spatial Resolution Resistivity Mapping of Large-Area YBCO Films by a Near-Field Millimeter-Wave Microscope." To be published in IEEE Trans. Microwave Theory Tech., Vol. 44, No. 7, July 1996. Racah Institute of Physics, Hebrew University of Jerusalem, Jerusalem 91904, ISRAEL; e-mail golos@vms.huji.ac.il.
C. Haetinger, I. Abrego Castillo, J. V. Kunzler, L. Ghivelder, P. Pureur, and S. Reich, "Thermal Expansion and Specific Heat of Nonrandom YBCO/Ag Composites." To be published in Supercond. Sci. & Technol. Contact P. Pureur, Instituto de Fisica, Universidade Federal do Rio Grande do Sul, P.O. Box 15051, 91501-970 Porto Alegre, BRAZIL; telefax +55 51 336 17 62; e-mail ppureur@if.ufrgs.br.
L. Hao, J. C. Macfarlane, and C. M. Pegrum, "Excess Noise in YBa2Cu3O7 Thin Film Grain Boundary Josephson Junctions and Devices." To be published in Supercond. Sci. & Tech. Basic Metrology Group, National Physical Laboratory, Teddington TW11 0LW, UNITED KINGDOM.
S. M. Hayden, G. Aeppli, T. G. Perring, H. A. Mook, and F. Dogan, "HighFrequency Spin Waves in YBa2Cu3O6.15." H. H. Wills Physics Laboratory, University of Bristol, Royal Fort, Tyndall Avenue, Bristol BS8 1TL, UNITED KINGDOM; telephone +44 117 928 8715; telefax +44 117 925 5624; email s.hayden@bris.ac.uk. 74.72.Bk; 61.12.-q; 74.25.Ha; 75.30.Ds.
J. Hejtmanek, M. Nevriva, E. Pollert, D. Sedmidubsky, and P. Vasek, "Superconductivity and Electric Transport of Bi2+xSr2-yCuO6+d Single Crystals." To be published in Physica C (in press). Institute of Physics, Cukrovarnicka 10, Praha 6, 162 00, CZECH REPUBLIC; telefax +42 02 312 31 84; e-mail hejtman@sun2.fzu.cz.
Fusao Ichikawa, Bairu Zhao, Tetsuji Uchiyama, Ryohei Kawabata, Teruhide Koga, Takeshi Arai, Takeshi Fukami, Takafumi Aomine, Ji-Jun Sun, Bo Xu, and Lin Li, "Magnetic Field and Orientation Dependence of Vortex Motion in YBa2Cu3O7/PrBa2Cu3O7 Multilayers." To be published in Physica C (in press). Department of Physics, Kyushu University, Fukuoka 812-81, JAPAN; telefax +81 92 642 2553; e-mail fusa7scp@mbox.nc.kyushu-u.ac.jp. Key words: flux creep, multilayers, electrical resistivity.
D. C. Johnston, "Antiferromagnetic Exchange in Two-Leg Spin-1/2 Ladders." Submitted to Phys. Rev. B. Ames Laboratory-USDOE and Department of Physics, Iowa State University, Ames, IA 50011-3020; telephone (515) 294-5435; telefax (515) 294-0689; e-mail johnston@ameslab.gov. 74.25.Ha; 74.72.Jt; 75.40.Cx.
Y. Kanamori and Y. Shiohara, "Effect of Temperature Gradient in the Solution on the Growth Rate of YBa2Cu3O7-x Bulk Single Crystals." To be published in Physica C (in press). Superconductivity Research Laboratory, International Superconductivity Technology Center (ISTEC), 10-13 Shinonome 1-chome, Koto-ku, Tokyo 135, JAPAN; telephone +81 3 3536-5703 through -5705; telefax +81 3 3536-5714 or -5717. Key words: YBa2Cu3O7-x bulk single crystal, modified top-seeded solution growth method, growth rate.
M. Karppinen, H. Yamauchi, H. Suematsu, and O. Fukunaga, "Synthesis of Various LaCuO3-y Phases by a High-Pressure Technique and Subsequent Post-Annealing Treatments." To be published in Physica C (in press). Contact H. Yamauchi, Center for Ceramics Research, Research Laboratory of Engineering Materials, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama 226, JAPAN; telefax +81 45 921 6953.
Thomas M. Katona and Stephen W. Pierson, "Zero-Field Current-Voltage Characteristics in High-Temperature Superconductors." Submitted to Phys. Rev. B. Contact Stephen W. Pierson, Department of Physics, Worcester Polytechnic Institute, Worcester, MA 01609-2280; e-mail pierson@wpi.edu. 74.25.Dw; 74.25.Fy; 74.60.Jg; 74.62.-c.
R. I. Khasanov, Yu. I. Talanov, W. Assmus, and G. B. Teitel'baum, "Crossover From Bulk Pinning to Geometrical Barrier in Bi2Sr2CaCu2Ox Single Crystal as Revealed by Scanning ESR-Probe Method." Submitted to Phys. Rev. B. Contact Yu. I. Talanov, Kazan Institute for Technical Physics of Russian Academy of Sciences, 420029 Kazan, RUSSIA; e-mail talanov@ksc.iasnet.ru. 74.60.Ge; 74.60.Ec.
JunIchiro Kishine, "Spin Fluctuations in Magnetically Coupled Bi-Layer Cuprates." Department of Physics, Faculty of Science, University of Tokyo, 7-3-1 Hongo, Tokyo 113, JAPAN; e-mail kishine@watson.phys.s.utokyo.ac.jp. Key words: magnetically coupled bi-layer, itineracy, spin fluctuations, spin gap.
R. A. Klemm, "Comment on 'Evidence for d_[x^2-y^2] Pairing from the Magnetic Field Modulation of YBa2Cu3O7-Pb Josephson Junctions.'" Submitted to Phys. Rev. Lett. Contact Janice Coble, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439; telefax (708) 252-9595; e-mail janice_coble@qmgate.anl.gov.
Yoji Koike, Tsutomu Takabayashi, Takashi Noji, Terukazu Nishizaki, and Norio Kobayashi, "Fourfold Symmetry in the ab-Plane of the Upper Critical Field for Single-Crystal Pb2Sr2Y0.62Ca0.38Cu3O8: Evidence for d_[x^2-y^2] Pairing in the High-Tc Superconductivity." To be published in Phys. Rev. B (in press). Department of Applied Physics, Faculty of Engineering, Tohoku University, Aramaki Aoba, Aoba-ku, Sendai 980-77, JAPAN; telefax +81 22 217 7975; e-mail koike@mlab.apph.tohoku.ac.jp. Key words: Pb2Sr2Y0.62Ca0.38Cu3O8, anisotropy in the ab plane, fourfold symmetry, d_[x^2-y^2] pairing, upper critical field. 74.60.Ec; 74.72.h.
H. Kuepfer, Th. Wolf, A. A. Zhukov, A. Will, C. Lessing, and R. MeierHirmer, "Development of the Current Peak in Dependence on Temperature and Oxygen Content." Presented at the Eighth Int. Workshop on Critical Currents in Supercond., (8th IWCC), Kitakyushu, Japan, May 27-29, 1996. Forschungszentrum Karlsruhe, Institut fuer Technische Physik, Postfach 3640, D-76021 Karlsruhe, GERMANY; Th. Wolf's telephone +49 7247 82 4885; telefax +49 7247 82 2849.
H. Kuepfer, A. A. Zhukov, A. Will, W. Jahn, M. Klaeser, and Th. Wolf, "Irreversible Behavior in the Vicinity of B||a,b in YBa2Cu3O7-d Single Crystals."
Presented at the Eighth Int. Workshop on Critical Currents in Supercond., (8th IWCC), Kitakyushu, Japan, May 27-29, 1996. Forschungszentrum Karlsruhe, Institut fuer Technische Physik, Postfach 3640, D-76021 Karlsruhe, GERMANY; Th. Wolf's telephone +49 7247 82 4885; telefax +49 7247 82 2849.
H. Kuepfer, A. A. Zhukov, A. Will, W. Jahn, R. Meier-Hirmer, Th. Wolf, V. I. Voronkova, M. Klaeser, and K. Saito, "Anisotropy in the Irreversible Behavior of Pointlike Defects and Twins in YBa2Cu3O7-d Single Crystals with a Peak Effect." To be published in Phys. Rev. B, Vol. 54, 1996. Forschungszentrum Karlsruhe, Institut fuer Technische Physik, Postfach 3640, D-76021 Karlsruhe, GERMANY; Th. Wolf's telephone +49 7247 82 4885; telefax +49 7247 82 2849. 74.60.Ge; 74.60.Mj.
H. Q. Li, R. H. Ono, L. R. Vale, D. A. Rudman, and S. H. Liou, "A Novel Multilayer Circuit Process Using YBa2Cu3Ox/SrTiO3 Thin Films Patterned by Wet Etching and Ion Milling." Contact Ronald H. Ono, NIST - Division 814.10 - Annex C, 325 Broadway, Boulder, CO 80303; telephone (303) 4973762; telefax (303) 497-3042; e-mail ono@boulder.nist.gov. 74.72.Bk; 74.72.Bz; 85.25.Na.
Mei-Rong Li, Yong-Jun Wang, Chang-De Gong, and Z. D. Wang, "Longitudinal Acoustic Attenuation in Unusual Two-Dimensional Superconductors." To be published in Physica C (in press). National Laboratory of Solid State Microstructures, Institute for Solid State Physics, Nanjing University and Center for Advanced Studies in Science and Technology of Microstructures, Nanjing 210093, PEOPLE'S REPUBLIC OF CHINA. 74.20.-z; 63.20.Ls.
V. M. Loktev, "The Mechanisms of High Tc Superconductivity of Copper Oxides." Submitted to Sov. J. Low Temp. Phys. N. N. Bogolyubov Institute for Theoretical Physics, Metrologicheskaya Str. 14-b, 252143 Kiev-143, UKRAINE; telephone +7 44 266 91 85; telefax +7 44 266 59 98; e-mail vloktev@gluk.apc.org.
J. B. Mandal, B. Bandyopadhyay, F. Fauth, T. Chattopadhyay, and B. Ghosh, "A New Mercury-Based High-Tc Cuprate Hg0.7V0.3Sr2-xLaxCuO4+d." To be published in Physica C (in press). Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Calcutta 700 064, INDIA; telefax +91 33 374637.
L. Margulies, K. W. Dennis, R. J. Hofer, M. J. Kramer, and R. W. McCallum, "The Effect of Carbon on the Peritectic Melting of Bi2212 and Bi2212+Ag." To be published in Physica C (in press). Ames Laboratory, Iowa State University, Ames, IA 50011; telephone (515) 294-9559; telefax (515) 294-4291; e-mail hanuman@iastate.edu.
R. G. Mints, I. B. Snapiro, and E. H. Brandt, "A Pancake Vortex Near the Sample Surface." School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, ISRAEL. 74.60.Ec; 74.60.Ge.
Takehiko Mori, Akinori Fuse, Hatsumi Mori, and Shoji Tanaka, "Transport Properties of Organic Metal Containing Magnetic Ions (BEDTTTF)2CsCo(SCN)4." To be published in Physica C (in press). Department of Organic and Polymeric Materials, Tokyo Institute of Technology, Ookayama, Tokyo 152, JAPAN; telefax +81 3 5734 2876; e-mail takehiko@o.cc.titech.ac.jp. Key words: electrical resistivity, organic superconductor, metal-insulator transition.
J. G. Noudem, J. Beille, D. Bourgault, D. Chateigner, and R. Tournier, "Bulk Textured Bi-Pb-Sr-Ca-Cu-O (2223) Ceramics by Solidification in a Magnetic Field." To be published in Physica C (in press). EPMMATFORMAG, Laboratoire d'Elaboration par Procede Magnetique, CNRS, B.P. 166, F-38042 Grenoble Cedex 9, FRANCE. 81.20.Ev; 81.40.Rs.
T. Nurgaliev, R. A. Chakalov, T. Donchev, Z. Ivanov, and A. Spasov, "Microwave Properties of YBCO Thin Films on YSZ Substrates in the Coupled Grain Model Approach." To be published in Physica C (in press). Institute of Electronics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee, 1784 Sofia, BULGARIA; telefax +359 2 757053; e-mail cryo@bgearn.bitnet.
Hai-Woong Park, Ki-Baik Kim, Kyu-Won Lee, Il-Hyun Kuk, Gye-Won Hong, and Chan-Joong Kim, "Sm2BaCuO5 Refinement Via an Attrition Milling and CeO2 Addition in the Sm-Ba-Cu-O Systems Melt-Textured at Oxygen Partial Pressures of 0.001 atm - 1 atm." To be published in Supercond. Sci. & Technol. Contact Chan-Joong Kim, Superconductivity Research Laboratory, Korea Atomic Energy Research Institute, P.O. Box 105, Yusung, Taejon 305-600, SOUTH KOREA; telephone +82 42 868 8025; telefax +82 42 862 5496.
M. Pekala, A. Tampieri, G. Celotti, M. Houssa, and M. Ausloos, "MagnetoTransport Study of Bi2223 Superconductor Produced by High Pressure Method." To be published in Supercond. Sci. & Technol. Department of Chemistry, University of Warsaw, Al. Zwirki i wigury 101, PL-02-089 Warsaw, POLAND; e-mail pekala@chem.uw.ed.pl.
P. Pugnat, G. Fillion, H. Noel, and B. Barbara, "Field and Temperature Dependence of the Anisotropy Ratio in a High Tc Superconductor." To be published in Europhys. Lett. Laboratoire de Magnetisme Louis Neel, CNRS, 25 Avenue des Martyrs, BP 166, F-38042 Grenoble Cedex 9, FRANCE; telephone +33 76 88 11 93; telefax +33 76 88 11 91; e-mail wegrove@labs.polycnrs-gre.fr. 74.50; 75.30.Gw; 74.60.Ec.
P. Pugnat, K. Lebbou, M. T. Cohen-Adad, J. L. Jorda, M. Couach, and G. Fillion, "High Critical Current Densities in (Tl0.5Pb0.5)Sr2xBaxCa2Cu3O9-d." To be published in the Proc. of the XXI Int. Conf. on Low Temperature Physics (LT21), Prague, Czech Republic, Aug. 8-14, 1996. Laboratoire de Magnetisme Louis Neel, CNRS, 25 Avenue des Martyrs, BP 166, F-38042 Grenoble Cedex 9, FRANCE; telephone +33 76 88 11 93; telefax +33 76 88 11 91; e-mail wegrove@labs.polycnrs-gre.fr.
L. Pust, D. Dlouhy, and M. Jirsa, "Virtual Additive Moments Measured by a Vibrating Sample Magnetometer on Superconducting Thin Films." To be published in Supercond. Sci. & Tech. Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, CZ 180 40 Praha 8, CZECH REPUBLIC; telephone +42 2 6605-2617; telefax +42 2 821227; e-mail pust@fzu.cz. Key words: magnetometry, superconductors, thin films, critical currents. 07.55.+x; 74.76.-w; 74.60.Ge; 74.25.Ha.
*A. Revcolevschi and J. Jegoudez, "Growth of Large High-Tc Single Crystals by the Floating Zone Method: A Review." To be published in Coherence in High Temperature Superconductors, edited by G. Deutscher and A. Revcolevshi (World Sci., Singapore). Laboratoire de Chimie des Solides, Universite Paris-Sud, Batiment 414, F-91405 Orsay Cedex, FRANCE; telephone +33 1 69 41 61 07 or 70 18; telefax +33 1 69 85 54 22; e-mail revco@psisun.u-psud.fr. *Additional citation information.
J. P. Rodriguez, "Critical Behavior of the Flux-Line Tension in Extreme Type-II Superconductors." To be published in Phys. Rev. B. Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545; preprint also available at cond-mat@xxx.lanl.gov (#9604152). 74.20.De; 74.60.-w; 11.15.Ha; 75.10.Hk.
J. P. Rodriguez, "On the Decoupling of Layered Superconducting Films in Parallel Magnetic Field." Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545; preprint also available at condmat@xxx.lanl.gov (#9604182). 74.60.Ec; 74.20.De; 11.10.Lm; 75.10.Hk.
A. I. Romanenko, A. V. Chehovsky, and L. P. Kozeeva, "Evidence of CuOxChains Contribution in the Conductivity of PrBa2Cu3O6+x Single Crystals." Submitted to JETP Lett. Institute of Inorganic Chemistry, 3 Acads. Lavrent'ev Ave. Novosibirsk 630090, RUSSIA; e-mail romanenk@casper.che.nsk.su. 74.10.+v; 74.25.Fy.
A. I. Romanenko, N. F. Zakharchuk, N. G. Naumov, P. P. Samoilov, V. E. Fedorov, and U-Hyon Paek, "Valence States of Atoms and Localization of Conductivity Electrons in PrBa2Cu3O6+x." Submitted to Bull. Korean Chem. Soc. Institute of Inorganic Chemistry, 3 Acads. Lavrent'ev Ave. Novosibirsk 630090, RUSSIA; e-mail romanenk@casper.che.nsk.su. Key words: valence states of atoms, oxygen contents, polycrystals, electron localization, disorder.
Th. Schuster, H. Kuhn, and E. H. Brandt, "Flux Penetration into Flat Superconductors of Arbitrary Shape: Patterns of Magnetic and Electric Fields and Current." Max-Planck Institut fuer Metallforschung, Institute fuer Physik, Postfach 800665, D-70506 Stuttgart, GERMANY. 74.60.Ec; 74.60.Jg.
S. Senoussi, A. Kilic, P. Manuel, R. Gagnon, L. Taillefer, and H. Traxler, "Anomalous Flux Pinning and Flux Creep Near the Critical State." To be published in Physica C (in press). Laboratoire de Physique des Solides, Universite Paris Sud, F-91405 Orsay Cedex, FRANCE; telefax +33 1 69 41 60 86.
T. Shibauchi, N. Katase, T. Tamegai, and K. Uchinokura, "Temperature Dependence of Anisotropic Penetration Depth in Under- and Over-Doped Bi2Sr2CaCu2O8+y." To be published in Physica C (in press). Department of Applied Physics, University of Toyko, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, JAPAN; telefax +81 3 3816 7805; e-mail g31111@m-unix.cc.utokyo.ac.jp. Key words: penetration depth, Bi2Sr2CaCu2O8+y, d-wave superconductor, pair breaking, low-lying excitation.
Sergey B. Simanovsky and Michael W. Klein, "Electron Scattering from Interacting Tunneling Units: A Model for High Tc Superconductivity." To be published in Phys. Rev. B. Department of Physics, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609-2280; Michael Klein's telephone (508) 831-5258; telefax (508) 831 5886.
C. Soriano, G. Costabile, and R. D. Parmentier, "Coupling of Josephson Flux-Flow Oscillators to an External RC Load." Research Unit INFM and Department of Physics, University of Salerno, I-84081 Baronissi (SA), ITALY; preprint also available at supr-con@xxx.lanl.gov (#9605002). 74.50.+r; 85.25.Dq.
J. Sosnowski, "The Investigations of the Current-Voltage Characteristics of the High Temperature Superconductors and Their Applications." Submitted to Int. J. Theor. Electrotech. (IJTE). Electrotechnical Institute, ul. Meiczyslawa Pozaryskiego 28, PL 04-703 Warsaw, POLAND; telephone +48 22 12 00 21; telefax +48 22 12 75 35.
Sophie Stassen, "New Synthesis Processes for 2212 and 2223 Bi-Based High-Tc Superconducting Ceramics." Submitted as a Ph.D. thesis (Universite de Liege). SUPRAS, Faculte des Sciences, Universite De Liege, Laboratoire de Chimie Inorganique Structurale, Sart Tilman, B4000 Liege, BELGIUM; M. Ausloos's telephone +32 41 66 37 52; telefax +32 41 66 29 90; e-mail ausloos@gw.unipc.ulg.ac.be; http://www.phe.ulg.ac.be/.
P. A. Suzuki and R. F. Jardim, "On the Diffusion of Ce into Eu2CuO4-y Compounds." To be published in Physica C (in press). Departamento de Engenharia de Materiais, Faculdade de Engenharia Quimica de Lorena, CP 116, 12600-000 Lorena, SP, BRAZIL. Key words: sol gel, high-Tc oxides, x-ray diffraction, diffusion.
T. Tatsuki, A. Tokiwa-Yamamoto, T. Tamura, Y. Moriwaki, X.-J. Wu, S. Adachi, and K. Tanabe, "A New Oxychloride, Ba2CuO2Cl2, Prepared Under High Pressure." Submitted to 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.
Sergey V. Uchaikin and Elena B. Ljapina, "Critical Current Meter for HTSC Ceramic." To be published in the Proc. of the 4th Int. Conf. Cryogenics '96, Praha, Czech Republic, April 22-26, 1996. Laboratory of Particle Physics, Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, RUSSIA; telephone +7 09621 6 48 54; e-mail uchaikin@se.jinr.dubna.su.
N. Vandewalle, M. Ausloos, N. Mineur, R. Cloots, Gwe-Won Hong, and ChanJoong Kim, "Dy2BaCuO5 Pattern Formation in Isothermally Non-Seeded MeltTextured DyBa2Cu3O7-d With 15% wt. Dy2O3 Addition." To be published in Supercond. Sci. & Technol. SUPRAS, Institute de Physique B5, Universite de Liege, Sart Tilman, B-4000 Liege, BELGIUM; e-mail vandewal@gw.unipc.ulg.ac.be. 74.72.Bk; 61.50.Cj.
E. L. Vavilova, N. N. Garif'yanov, E. F. Kukovitsky, and G. B. Teitel'baum, "Investigation of the Phase Separation in Superconducting Regions of La2CuO4+d." To be published in Physica C (in press). Kazan Institute for Technical Physics, 420029 Kazan, RUSSIA. Key words: phase separation, NQR, oxygen stoichiometry, magnetic susceptibility.
J. A. Wilson and A. Zahrir, "Simply High Tc: A Negative-U Interpretation of Cuprate Superconductivity, Incorporating Questions of Crossover, Microinhomogeneity and a Compound Order Parameter." Submitted to Adv. Phys. H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, UNITED KINGDOM. Key words: HTSC, cuprates, negative U, order parameter, mixed-valent microinhomogeneity.
X.-J. Wu, T. Tamura, S. Adachi, T. Tatsuki, and K. Tanabe, "X-ray Diffraction and Transmission Electron Microscopy Studies on the Structure of 'Pb'-1223 Superconductor." 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.
Y. Y. Xue, R. L. Meng, Q. M. Lin, B. Hickey, Y. Y. Sun, and C. W. Chu, "Hg Vapor Pressure, Phase Stability, and Synthesis of Hg1-xBa2Can1CunO2n+2+d with n <= 3." Preprint #96:064; to be published in Physica C. Texas Center for Superconductivity, University of Houston, Houston, TX 77204-5932; telephone (713) 743-8200; telefax (713) 743-8201; e-mail preprints@www.tcs.uh.edu. Key words: synthesis of, substitution effects, HgBa2Can-1CunO2n+2+d. 64.70.Hz; 74.72.Jt.
J.K.F. Yau, N. Savvides, and C. C. Sorrell, "Influence of Mechanical Strain on Critical Current Density and Microstructure of Silver-Sheathed Bi(Pb)2223 Superconducting Tapes." To be published in Physica C. School of Materials Science and Engineering, University of New South Wales, P.O. Box 1, Kensington, Sydney, 2052, AUSTRALIA; telephone +61 2 385 4436; telefax +61 2 385 5956; e-mail j.yau@unsw.edu.au. Key words: high-Tc superconductor, strain tolerance, critical current density, Bi(Pb)2223, superconducting tape.
Katsumi Yoshino, Anvar A. Zakhidov, Hirotake Kajii, Hisashi Araki, Kazuya Tada, Takanobu Noguchi, Toshihiro Ohnishi, and Kyuya Yakushi, "Multiphase Superconductivity in OO-PPV/C60 Composite Doped by Alkali Metals: Low-Field Microwave Absorption and SQUID Study." To be published in Physica C (in press). Department of Electronic Engineering, Faculty of Engineering, Osaka University, Yamada-Oka, Suita, Osaka 565, JAPAN.
J. Zhao, C. Dong, Y. X. Fan, F. Wu, H. Chen, G. C. Che, and Z. X. Zhao, "Determination of the Solid-Solution Region of Infinite-Layer Compound (Sr1-xCax)CuO2 Under Ambient Pressure by X-ray Diffraction." To be published in Physica C (in press). Department of Chemistry, State University of New York at Buffalo, Buffalo, NY 14260; e-mail jimzha@acsu.buffalo.edu.
A. G. Zaitsev, R. Woerdenweber, T. Koenigs, E. K. Hollmann, S. V. Rasumov, and O. G. Vendik, "Effect of Structural and Morphological Imperfections on the Microwave Surface Resistance of YBCO Thin Films." To be published in Physica C (in press). Institut fuer Schicht- und lonentechnik, Forschungszentrum Juelich, D-52425 Juelich, GERMANY. Key words: YBCO thin films, surface impedance, defect structures.
B. Zeimetz, S. X. Dou, and H. K. Liu, "Improved Critical Current of Superconducting Bi-2223/Ag Tapes for Current Lead Application by Addition of 'Large' Silver Particles." Submitted to Supercond. Sci. & Technol. Centre for Superconducting and Electronic Materials, University of Wollongong, Wollongong NSW 2522, AUSTRALIA; telephone +61 42 21 4731; telefax +61 42 21 4577; e-mail bzeimetz@uow.edu.au. 61.50.J; 74.00; 81.40.Rs.
Mao Zhiqiang, Xu Gaojie, Wang Ruiping, Tian Mingliang, and Zhang Yuheng, "Normal State Spin Gap in Bi-based 2201 Phase." Submitted to Phys. Rev. B. Structure Research Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, PEOPLE'S REPUBLIC OF CHINA. 74.72.Hs; 74.25.Fy.
W. Zhou, "HREM Surface Profile Images of Bi2Sr2CaCu2O8." To be published in J. Supercond., July 1996. IRC in Superconductivity and Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UNITED KINGDOM; telephone +44 1223 336486; telefax +44 1223 336362; e-mail wz100@cam.ac.uk. Key words: superconductor, Bi2Sr2CaCu2O8, surface structure, electron microscopy.
July 31 - Aug. 1, 1996: USDOE Superconductivity Program for Electric Systems: Annual Peer Review, Loews L'Enfant Plaza, Washington, DC. Intended for those interested in recent progress made in the federal effort to capture energy advantages of superconductivity. Meeting is open to the public. Objectives: to have leading experts review presentations of research results, performance, and proposals for future work; to learn status of major systems projects for development of super-efficient industrial motors, power cables, current limiters, and generators; and to offer a public forum to those wanting information about status of this emerging technology and future research priorities. For further information, contact Jim Daley, Program Manager, Department of Energy, telephone (202) 586-1165; Chris Platt, Program Manager, Department of Energy, telephone (202) 586-8943; or Craig Matzdorf, Energetics, telephone (410) 290-0370.
*Aug. 19 - 31,1996: Materials Aspects of High Tc Superconductivity: Ten Years after the Discovery, NATO Advanced Study Institute, European Cultural Center, Delphi, Greece. Purpose is to commemorate the 10th anniversary of this discovery by discussion of latest results in the HTS field. Particular emphasis on strong interaction between superconductivity and the materials properties of the cuprates. Lectures to include discussion of phase-separation problems and structural and electronic inhomogeneities (superstructures, staging, phase transitions, etc.). Lecturers will include G. Bednorz, Y. Berthier, A. Bianconi, M. C. Crawford, P. Edwards, A. Furrer, D. C. Johnston, M. Kastner, M. Marezio, K. A. Mueller, B. Raveau, H. Rietschel, Z. Schlesinger, and Z. X. Zhao. For information, contact Prof. E. Kaldis, Labor. fuer Festkoerperphysik ETH, CH-8093 Zurich, Switzerland; telephone +41 1 633 22 51; telefax +41 1 633 11 26; e-mail kaldis@solid.phys.ethz.ch.
Aug. 23 - 24, 1996: 2nd Canadian Applied Superconductivity Workshop, National Research Council of Canada, Institute for Microstructural Sciences, Ottawa, Canada. Aimed at researchers from industry, universities, and government working with the superconductivity industry in Canada. Second workshop in this series. Discussion on new market opportunities for HTS in electronics, microwave, and power applications. Several invited talks to provide a world view of the superconducting industry and, more specifically, to the niche markets targeted by Canadian industry. Registration fee: $195 (Canadian funds); $145 for students; includes lunch and dinner on Friday. For further information, contact Mike Denhoff, National Research Council of Canada, Ottawa, Canada K1A 0R6; telephone (613) 993-4042, telefax (613) 952-5711; e-mail mike.denhoff@nrc.ca; or Raafat Mansour at COM DEV, telephone (519) 6222300 ext. 246; telefax (519) 622-1691; e-mail raafat.mansour@comdev.ca.
*Aug. 25 - 30, 1996: The 1996 Applied Superconductivity Conference, Pittsburgh Convention Center, Pittsburgh, PA. Hosted by Westinghouse Science and Technology Center. Major areas: superconducting materials for a wide range of applications, superconducting electronics, and large-scale applications. Celebration luncheon commemorating the 10th anniversary of the discovery of HTS materials will feature distinguished speakers in the field. The 1996 meeting will use both oral and poster formats for invited presentations. Early registration deadline, August 1, 1996. Selected papers to be published in IEEE Transactions on Applied Superconductivity. For information, contact William Shoemaker, Conference Manager, AHI Conference Management, Hudsons Cross Roads, Selbyville, DE 19975; telephone (800) 788-7077; telefax (302) 436-1911; e-mail convene@ aol.com. Detailed information available at the WWW site http://www.essd.com/stc/asc/index.htm.
*Sept. 16 - 20, 1996: International Conference on Substrate Crystals and HTSC Thin Films, Jaszowiec, Poland. Aim is to provide an interdisciplinary forum for scientists amd engineers for an exchange of investigation, results, and and experience in the growth of substrate single crystals and thin films of HTSC. The following topics will be discussed: (1) substrate single crystals -- oxide crystals of perovskite- and pseudo-perovskite-type structure, crystal growth, and properties of crystals; (2) interface -- misfit between film and substrate, lattice constants and distances of ions, orientation, defect ordering, surface preparation, interdiffusion, structure compatibility, and thermal expansion; (3) thin films of HTSC -- surface reconstruction, in-situ observations of thin-film growth, physical and chemical properties of films related to substrate crystal, network of defects, and epitaxial tension. Invited lectures, contributed oral and poster sessions. Conference language is English. For information contact M. Berkowski, Secretary, ICSC-F'96, Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668 Poland; telephone +48 22 437001 ext. 344; telefax +48 22 430926; e-mail scf96@ifpan.edu.pl.
Oct. 1 - 4, 1996: Eighth National Congress on High Temperature Superconductivity (SATT 8), Como, Villa Olmo, Italy. Organized by CISE SpA, CNR-ITM, INFN-LASA, Pirelli Cavi SpA, and University of Milano. Aim is to discuss the latest developments on high-Tc and conventional superconductors, and to promote dialogue and cooperative activities among the national groups. Oral and poster sessions classified among the following themes: (1) superconducting materials and associated technologies; (2) electronic, optical, and acoustic spectroscopies; (3) electric, magnetic, mechanical, and thermal properties; (4) dynamics and pinning of fluxoids, and dissipative phenomena; (5) theories and mechanisms of HTS; (6) Josephson effect and devices; and (7) applications. Abstract deadline, July 10, 1996. Papers to be refereed and published in a special issue of Nuovo Cimento D. For further information, contact SATT 8 Secretariat, Centro di Cultura Scientifica "A. Volta," Villa Olmo, Via Cantoni, I-22100 Como, Italy; telephone +39 31-572213; telefax +39 31-573395; e-mail congress@icil64.cilea.it. Information also available at the homepage http://www.pirelli.com/village/news/news/news.htm.
*Nov. 12 - 15, 1996: 41st Annual Conference on Magnetism & Magnetic Materials, Atlanta Hilton Towers, Atlanta, GA. Sponsored jointly by the American Institute of Physics and the Magnetics Society of the IEEE. Conference will include all areas of basic and applied science and technology related to magnetism. Technical subject categories will include fundamental properties and cooperative phenomena, transport properties, computational magnetics and imaging, soft magnetic materials and applications, hard magnetic materials and applications, artificially structured materials, other magnetic materials, magnetic recording, applications, and interdisciplinary topics. Proceedings to be published in a special issue of J. Appl. Phys. Invited and contributed papers as well as an exhibition of services, equipment, and materials. For further information, contact Diane Suiters, Conference Coordinator, 655-15th St. N.W., Suite 300, Washington, DC 20005; telephone (202) 6395088; telefax (202) 347-6109; e-mail magnetism@mcimail.com. (Preliminary program and general conference information available after Sept. 15, 1996, at the URL address http://www.aip.org/edops/mmm96prog.html.)
*Dec. 2 - 6, 1996: MRS Fall Meeting: Symposium GG -- High-Temperature Superconductivity - Interplay of Fundamentals and Applications. This symposium will focus on two general problems of interest to both fundamental research and commercial applications: (1) critical currents in bulk high-temperature superconductor materials, and (2) superconductor interfaces in thin-film materials. Goal is also to foster interactions among researchers concerned with problems from both perspectives. Original experimental and theoretical papers on the following topics are requested: vortex structure, pinning, and dynamics; critical currents; wire and tape processing and properties; thin-film growth; heterostructures and interfaces; devices; and applications. Abstract deadline, June 21, 1996. Contact one of the symposium organizers: Charles M. Lieber, Department of Chemistry, Harvard University, 12 Oxford Street, Cambridge, MA 02138; telephone (617) 496-3169; telefax (617) 496-5442 or -6731; e-mail cml@cmliris.harvard.edu; or Ivan Bozovic, MS K-114, Edward Ginzton Research Center, Varian Associates, Inc., 3075 Hansen Way, Palo Alto, CA 94304-1025; telephone (415) 424-6358; telefax (415) 424-6988; e-mail ivan.bozovic@grc.varian.com. Information also available at the MRS homepage http://www.mrs.org.
*Feb. 23 - 25, 1997: 1997 International Symposium on Intrinsic Josephson Effect and THz Plasma Collisions in High Tc Superconductors, Institute of Materials Research, Tohoku University, Sendai, Japan. Topics will include cuprate superconductors, single crystals, highquality thin films, anisotropic electronic and magnetic properties, vortex flow in layered structures, high-frequency plasma oscillations, far-infrared properties, and high-frequency electronic devices. Invited, oral, and poster contributions. Abstract deadline, November 15, 1996. Official language is English. For further information, contact Kensuke Makajima or Sergei E. Shafranjuk, Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980, Japan; telephone +81 22 217-5472 or -5476; telefax +81 22 217-5473; e-mail knaka@riec.tohoku.ac.jp or sergei@riec.tohoku.ac.jp.
*Feb. 28 - March 4, 1997: Fifth International Conference on Materials and Mechanisms of Superconductivity and High-Temperature Superconductors (M2S-HTSC-V), Beijing, China. 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 deadline, September 1, 1996. For information, contact D. Jin, M2S-HTSC-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.
Information
New Volumes in Series: Studies of High Temperature Superconductors, Advances in Research and Applications, edited by Anant Narlikar. Volume 14: Field Penetration and Magnetization of High Temperature Superconductors, includes the following topics -- visualization of Shubnikov phase using the high-resolution Faraday effect, mechanism of microwave absorption and flux distribution in high-temperature superconductors, field penetration and magnetization of HTS materials, experimental aspects of magnetization studies in superconductors, recent developments of the critical-state model, anomalous magnetization in YBa2Cu4O8 single crystals (surface barrier and fishtail), low-field magnetic behavior of high-temperature superconductors, irreversible part of magnetization due to flux pinning, irreversibility line in hightemperature superconductors, non-linear flux-flow regime in hightemperature superconductors, and harmonic generation in high-temperature superconductors. Publ. 1995; 445 pp.; price $97; ISBN 1 56072 182 0. Volume 15: Electron Microscopy and Channeling Studies of High Temperature Superconductors, includes the following topics -- investigation of high-Tc cuprates using energetic ion channeling, contribution of TEM to the understanding of the structure, microstructure, and superconducting properties of Bi-compounds; highresolution electron microscopy of Tl- and Pb-based superconductors; structures of oxycarbonate superconductors examined by high-resolution TEM; chemistry and structure of surfaces of oxide superconductors by HREM; Z-contrast imaging and hole concentration mapping in YBCO thin films; TEM investigations of microstructural characteristics of hightemperature superconductors; and oxygen ordering in YBa2Cu3Oz (7 >= z > 6) superconductor studied by high resolution TEM. Publ. 1995; 315 pp.; price $98; ISBN 1 56072 219 3. Volume 16: Synthesis, High Pressure Effects and Some Miscellaneous Aspects, includes the following topics -- recent progress in high-pressure investigation for high-Tc superconductors, high-pressure synthesis of superconducting cuprates with 1212- and 1222-type structures, physico-chemical investigation of crystal growth of superconducting YBa2Cu3O7-y, phase evolution during the fabrication of bulk Bi-based superconducting glass ceramics, superconductivity and stoichiometry in the electron-doped L2-xMxCuO4 oxides, optical properties of Bi2Sr2Can-1CunO4+2n+d and the related compounds, and phenomenon of photoinduced superconductivity from theoretical prediction to experimental discoveries. Publ. 1995; 307 pp.; price $97; ISBN 1 56072 251 7.
Contact Nova Science Publishers, Inc., 6080 Jericho Turnpike - Suite 207, Commack, NY 11725; telephone (516) 499-3103; telefax (516) 4993146; e-mail Novasci1@aol.com.
New Book: Superconductivity in Metals and Cuprates, by J. R. Waldram (Cambridge). Covers both the theoretical and experimental aspects of basic physics of superconductivity. Designed to be accessible to senior undergraduate and graduate students, but also suitable for researchers in physics, materials science, engineering, physical chemistry, and those with an interest in superconductivity. Book concentrates more on facts and ideas and avoids lengthy presentations of theory. Publ. 1996; 220 pp.; price $120 (hardcover), $40 (paperback); ISBN 0 85274 335 1 (hardcover), 0 85274 337 8 (paperback). Contact John Long, Sales Manager, Institute of Physics (IOP) Publishing, Inc., The Public Ledger Bldg. Suite 1035, 150 South Independence Mall West, Philadelphia, PA 19106; telephone (215) 627-0880; telefax (215) 627-0879. URL http://www.iop.org.
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High-Tc Update, Vol. 10, #12, June 15, 1996.