Electronic Properties of High-Tc Superconductors

The International Winter School on Electronic Properties of High-Temperature Superconductors, held between March 7-14, 1992, in Kirchberg, (Tyrol) Austria, was the sixth in a series of meetings to be held at this venue. Four of the earlier meetings were dedicated to issues in the field of conducting polymers, while the winter school held in 1990 was devoted to the new discipline of high-T c superconductivity. This year's meeting constituted a forum not only for the large number of scientists engaged in high-Tc research, but also for those involved in the new and exciting field of fullerenes. Many of the issues raised during the earlier winter schools on conducting polymers, and the last one on high-T c superconductivity, have taken on a new significance in the light of the discovery of superconducting C materials. 60 The Kirchberg meetings are organized in the style of a school where expe­ rienced scientists from universities, research laboratories and industry have the opportunity to discuss their most recent results, and where students and young scientists can learn about the present status of research and applications from some of the most eminent workers in their field. In common with the previous winter school on high-Tc superconductors, the of the cuprate superconductors. present one focused on the electronic properties In addition, consideration was given to related compounds which are relevant to the understanding of the electronic structure of the cuprates in the normal state, to other oxide superconductors and to fulleride superconductors.

Contenu

High-Temperature Superconductors in 1992 Welcome Address.- I General Properties, Preparation, Structure.- Charge Dynamics in Metallic CuO2 Layers.- Superconductivity in the Infinite-Layer Phase Stabilized Under High Pressure.- Crystal Chemistry and Superconductivity in M(Ba1?ySry)2RECu2Ox.- Superconducting Mixed-Metal Oxide Compounds of the Type Sr2Ln1.5Ce0.5MCu2O10??, Ln = Sm, Eu, M = Nb, Ta.- II Applications, Film Preparation.- High-Tc Superconductivity: Present Status of Applications.- Recent High-Tc-SQUID Developments.- Epitaxial YBCO Films on MgO, SrTiO3, Si, and GaAs by Thermal Coevaporation.- Preparation and Patterning of (110) Oriented YBaCuO Thin Films.- YBa2Cu3O7/PrBa2Cu3O7 Superlattices: Properties of Ultrathin YBa2Cu3O7 Layers.- Synthesis of New HTS by Pulsed Laser Deposition.- Epitaxial Growth of Thin-Film Bi2Sr2CaCu2O8+x on LaA1O3(001), NdGaO3(001) and MgO(001).- III Transport Properties, Thermal Properties.- Aspects of Quantum Coherence in Superconducting Rings: Flux Quantisation in a Heavy Fermion/Niobium Hybrid Ring and the Origin of Noise in a HTC DC SQUID.- Effect of Thermodynamic Fluctuations on the Transport Properties in YBaCuO Thin Films.- Metallic Weak-Link Character of Grain Boundaries in High-Tc Materials.- The Chemical Potential and Thermodynamic Properties of Narrow-Band Superconductors.- Nonequilibrium Properties of HTSC Under Microwave Irradiation.- Hall Effect of Epitaxial YBa2Cu3O7?x and Bi2Sr2CaCu2Oy Films.- Anomalous Thermoelectric Power of the High-Tc Materials in Normal State: Both Copper Oxides and C60 Fullerene.- On the Valency of Pr in (Y1?xPrx)Ba2Cu3O7.- Anisotropy of Transport Properties of HTSC Monocrystals.- IV High-Energy Spectroscopies.- On the Surface-Derived State of Cleaved YBa2Cu3O7?? Single Crystals.- Investigation of the Electronic Structure of High-Temperature Superconductors by Polarized X-Ray Absorption Spectroscopy.- Unusual Temperature-Dependent Behavior of the Bi2Sr2CaCu2O8+? Energy Gap.- Metal and Semiconductor Overlayers on Bi2Sr2CaCu2O8+?.- Electronic Properties of T*-Nd1.4Ce0.2Sr0.4CuO4??.- V Hyperfine Interactions, Magnetic Properties.- to the Nuclear Magnetic Resonance (NMR) in High-Tc Superconductors.- Probing the Electronic Structure of Y-Ba-Cu-O Superconductors by Cu, O and Ba NQR and NMR.- NMR Investigation of Low-Energy Excitations in YBa2Cu3O6+x Single Crystals.- Vortex Lattice and Vortex Motion in YBa2Cu3O7?? and YBa2Cu4O8 Superconductors from 89Y NMR.- Neutron Scattering Investigation of the Spin Dynamics in the High-Temperature Superconducting System YBa2Cu3O6+x.- 205Tl NMR in the High-Tc Superconductor T12Ba2CaCu2O8??.- Effects of Ni to Cu Substitution in La2CuO4 from 139La NQR and Relaxation.- 1H-NMR in YBa2Cu3O7??Hx.- Probing the Flux Distribution of Thin Films by Surface Spin Probes.- VI Optical Spectroscopy, Raman Scattering.- Possible Origins of the Continuum in the Cu-O Plane-Polarized Raman Spectra of Copper-Oxide Superconductors.- Phonon Self-Energy Effects in YBa2Cu3O7?? Below Tc: The Role of Oxygen Disorder.- Normal-State Conductivity of Cuprate Superconductors: One-Component and Two-Component Viewpoints.- Resonant Raman Scattering in Bi2Sr2Ca1?zYzCu2O8+? Single Crystals.- Normal-State Infrared Response from Ellipsometric Measurements: YBa2Cu3O7 and PrBa2CU3O7.- Change of Electronic Structures with Varying Lattice Distortion and Metal Valence in Titanium and Vanadium Oxides.- Tests for Nonreciprocal Optical Effects in High-Temperature Superconductors.- Search for Time Reversal Symmetry Violation in High-Temperature Superconductors.- Far-Infrared Applications of High-Temperature Superconductors: Fabry-Pérot Resonators and Fast Detectors.- Application of YBa2Cu3O7?? Thin Films on Silicon Substrates for Far-Infrared Fabry-Pérot Resonators.- Giant Voltages Upon Surface Heating in Normal YBa2Cu3O7?? Films Explained by an Atomic-Layer Thermopile.- Study of Residual Absorption of High-Tc Thin Films by Means of Photothermal Interference Spectroscopy.- Damping of Spin Excitations in the HTC-Cuprates: Undoped and Lightly Doped Material.- Raman Study of the Order Parameter in Oxide Superconductors.- Impurities and Raman Scattering in High-Tc Superconductors.- Polarization-Dependent Electronic Raman Scattering in Single Crystals of REBa2Cu3O7?x.- Chain-Oxygen Vibrations and Phonon Anomalies Above Tc in RBa2Cu3O7 and YBa2Cu4O8.- Phonon Softening and Electron-Phonon Interaction in YBa2Cu3O7??.- Phonon Behavior in the Bi-Sr-Ca-Cu-O-System.- Optical and Electrical Properties of Rare-Earth Substituted Ceramic Samples of the Y-Ba-Cu-O-System.- Far-Infrared Properties of Y1?xPrxBa2Cu3Oy Ceramics.- Influence of the Oxygen Content on the Optical Conductivity Function of YBa2Cu3Ox (6 ? X ? 7).- Effect of Cu-O Planes and Oxygen Content on Optical Properties of BISCO Crystals.- Optical Anisotropy and Electron-Phonon Coupling in Bi2Sr2CaCu2O8 Single Crystals.- Midgap Electronic States in Semiconducting YBa2Cu3O6+x: A NIR Excited Raman Investigation.- Optical Absorption due to Pr3+ 4f-4f Transitions in PrBa2Cu3Ox (x ? 6).- VII Theory.- One- and Two-Particle Excitations in Doped Mott-Hubbard Insulators.- Consistent Description of High-Tc Superconductors with the Three-Band Hubbard Model: Quantum Monte Carlo Studies.- Relation Between Transition Temperature, London Penetration Depth and Kosterlitz-Thouless Behavior in Superconductors.- "Small" Masses and Strong Coupling in High-Tc Superconductors and in Heavy-Fermion Compounds.- Electronic Structure and Superconductivity in YBa2Cu3O7/PrBa2Cu3O7 Superlattices.- Intermediate Range Order in the Possibility of Nonlinear Excitations in the Doping Subsystems of Cuprates.- Phase Separation and High-Tc Superconductivity.- Temperature-Dependent Phase Separation in the Emery Model.- Pairing Interaction Induced by Distortive Electron-Lattice Coupling.- Cooperative Electronic Phenomena in High-Tc Superconductors.- Calculation of Electronic Excitation and Ionization Process in High-Tc Superconductors.- Investigation of Tunneling, Linear and Nonlinear Optical Properties of Negative-U Local-Pair Model for Oxide High-Tc Superconductors.- Electric Field Gradient Calculations of PrBa2Cu3O7.- Are There Ordering Effects in Ba(Pb,Bi)O3 and (Ba,K)BiO3?.- Constraint-FLAPW Calculations and Determination of Hubbard Model-Parameters for BaBiO3.- Electronic Structure Aspects of the Pressure Dependence of…