High Tc Superconductors

Abstract

Section 1: Overview.- The solid state chemistry of mixed valence copper oxide high Tc superconductors (invited).- Critical overview of theories for high temperature superconductors (invited).- Section 2: Materials-Structure.- Some effects of chemical substitution and applied pressure on high Tc copper oxide superconductors (invited).- Defect chemistry of oxide superconductors (invited).- Deviation from linearity of the Cu-O chains in orthorhombic YBa2Cu3O7 by high-resolution neutron powder diffraction.- Electron irradiation effects in YBa2Cu3O7?? single crystals.- Physical properties and structural chemistry of YBa2Cu3Ox prepared by a defined oxygen sorption procedure.- Correlation of Tc with the rare earth size in (Ln)Ba2Cu3O6+x superconductors (Ln = La,Nd,Sm,Eu,Yb Cocktails). Single crystal x-ray diffraction and electron microscopy studies.- Electrical resistivity, magnetic susceptibility, and infrared spectra of superconducting RBa2Cu3O7 with R = Y,Sc,Tm, Ho,Eu,Nd,Gd.- Heat capacity measurements on some high-Tc superconductors.- Specific heat of the superconducting compound YBa2Cu3O7?x in magnetic fields.- Effect of Cu/Zn substitution upon superconductivity in YBa2(Cu1?xZnx)3O7?? and La1.85Sr0.15Cu1?xZnxO4??.- Effect of composition and atomic substitutions on structure and superconductivity of Y1Ba2Cu3Ox.- Transport and spectroscopic properties of undoped and Zndoped ceramic superconductors.- Raman investigations of the Y-Ba-Cu-O-system.- Difference of thermoelectric power in single and multiple phase Y-Ba-Cu-O superconductors.- Apatite as a promising source of rare earths, strontium and barium for high temperature superconductors.- Section 3: Theory-Mechanisms.- Boson exchange mechanisms and the high Tc oxides (invited).- Mechanisms of high-Tc superconductivity (invited).- Anisotropy effects in the system La-Sr-Cu-O.- Influence of pressure and substitution of copper by transition metals on high-Tc superconductors.- Test of phonon mediated pairing from Raman scattering on high-temperature superconductors.- Are one-dimensional structural features essential for superconductivity at 90 K?.- Theory of oxygen ordering and absorption in 1,2,3 high-Tc superconductors.- Cu d-d orbital transitions and charge-transfer excitations in high-Tc superconductors.- Electronic structure of La2?xSrxCuO4 and YBa2Cu3O7?y.- Susceptibility and Moessbauer studies of orthorhombic and tetragonal EuBa2(Gu1?x57Fex)3O7??.- Search for barium isotope effect in the high-Tc superconductor YBa2Cu3O7?x.- Pure metallic bridge and point-contact tunneling into single- and polycrystalline YBa2Cu3O7?y.- Section 4: Critical Fields-Critical Currents.- Upper critical field of grain oriented cuprate superconductors (invited).- Critical fields and characteristic lengths in copper oxide superconductors (invited).- Critical current densities of oxide superconductors (invited).- Anisotropy of the lower critical field in YBa2Cu3O7??.- Crystal growth and some magnetic properties of YBa2Cu3O7??.- Flux pinning in Y1Ba2Cu3O7?? single crystals.- Effect of neutron irradiation on critical magnetization current in single crystal YBa2Cu3O7??.- Magnetization and x-ray studies of YBa2Cu3O7?x irradiated by fast neutrons.- Superconducting properties of oxygen deficient YBa2Cu3O7??.- Ac susceptibility and inductive critical current measurements in polycrystalline YBa2Cu3O7.- The complex ac susceptibility - critical current relationship in oxide superconductors.- Josephson phase coherence and coupling in high Tc granular superconductors.- Electronic and magnetic properties of YBa2Cu3O7?x uperconductor.- Coexistence of magnetism and superconductivity in a YBa2Cu3O7?x compound.- Studies of HTS ceramics - copper interaction.- Section 5: Thin Films.- High Tc superconducting oxide thin films: fabrication, application, and characterization (invited) Abstract only.- Stoichiometry and deposition rate of dc magnetron sputtered Y-Ba-Cu-O thin films as a function of target presputtering time.- Superconducting films of YBaCuO.- Participants.- Author index.