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In the past two years conferences on superconductivity have been characterized by the attendance of hundreds of scientists. Consequently, the organizers were forced to schedule numerous parallel sessions and poster presentations with an almost unsurveyable amount of information. It was, therefore, felt that a more informal get-together, providing ample time for a thourough discussion of some topics of current interest in high-temperature superconductivity, was timely and benefitial for leading scientists as well as for newcomers in the field. The present volume contains the majority of papers…mehr
In the past two years conferences on superconductivity have been characterized by the attendance of hundreds of scientists. Consequently, the organizers were forced to schedule numerous parallel sessions and poster presentations with an almost unsurveyable amount of information. It was, therefore, felt that a more informal get-together, providing ample time for a thourough discussion of some topics of current interest in high-temperature superconductivity, was timely and benefitial for leading scientists as well as for newcomers in the field. The present volume contains the majority of papers presented at the International Discussion Meeting on High-Tc Superconductors held at the Mauterndorf Castle in the Austrian Alps from February 7 to 11, 1988. Each subject was introduced in review form by a few invited speakers and then discussed together with the contributed poster presentations. These discussion sessions chaired by selected scientists turned out to be the highlights of the meeting, not only because all the participants truly appreciated the possibility of an information exchange, but mainly because of the magnificent job done by the discussion chairmen, John A. Mydosh (Leiden), Martin Peter (Geneva) and Ken E. Gray (Argonne). First results on the just discovered Bi-superconductors and the clarification of electron resonance experiments on (123)-compounds should be mentioned in particular. The relaxed atomosphere favoring free discussions was certainly promoted by the surroundings offered in the Mauterndorf Castle, which dates back to 1253. Poster presentations and a conference banquet in historic knight's halls are certainly not found everyday in conference routines.
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Inhaltsangabe
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-Tcsuperconductivity (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 Mössbauer 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.
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-Tcsuperconductivity (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 Mössbauer 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.
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