Researchers actively interested in high-Tc superconductivity will find in this book a very useful summary of the latest results and our current understanding of the field.

This volume contains the proceedings of the International Winter School on Electronic Properties of High Temperature Superconductors, which was held March 3-10, 1990, in Kirchberg (Tyrol), Austria. This course was a sequel to three meetings on the subject of conducting polymers held there one, three and five years previously. The new topic was taken up since many of the scientists working on conducting polymers are now also actively interested in high-Tc superconductors, a research area that continues to develop at a remarkable pace. There have been numerous specialist conferences on high-Tc superconductors since their discovery by Bednorz and Muller in 1986. The Kirchberg meetings are intended as a school where experienced scientists from universities, research laboratories, and industry have the opportunity to discuss their most recent results, and where young scientists and students can learn about the present status of research in this field. The 1990 winter school was again organized in cooperation with the "Bundesministerium fur Wissenschaft in Austria and with the "Bundesministerium fur Forschung und Forschung" und Technologie" in the Federal Republic of Germany. The scientific interest was focused on the electronic structure of high-Tc superconductors and related compounds. At the beginning of each session, tutorial contributions were presented as an introduction for non-specialists. These were followed by research contributions elucidating the current state of our know ledge about high-Tc superconductors.

Inhalt
I General Properties, Preparation, Doping, Structure.- Experimental Results on High-Tc Superconductors: A Critical Selection.- Double Chains in YBa2Cu4O8 (Tc = 80K) and Y2Ba4Cu7O15±x (14? Tc ? 70K) and Their Influence on the Physical Properties.- Constitution of the System Bi-Sr-Ca-Cu-O and Preparation of the Three Superconducting Compounds.- Optimization of the Laser Ablation Process for Epitaxial YBCO Thin Film Growth.- New Dielectric Substrates for Microwave and Far-Infrared Applications of High-Tc Thin Films.- On Incommensurate Phases in High-Tc Compounds.- Substitutional and Oxygen Doping in YBa2Cu3Oy.- The Effect of Cu/Zn Substitution upon Superconductivity in Nd1.85Ce0.15CuO4.- Hole Density in the High-Temperature Superconductor (Bi, Pb)SrCaCuO.- Influence of Pb Doping on the Physical Properties of the BiSrCaCuO System.- Spatial Inhomogeneity in Superconducting YBaCuO-Films.- II Transport, Tunneling, Thermal Properties.- Surface Impedance of High-Tc Superconductors.- Detection of Flux Creep by Microwave Absorption.- Magnetic Investigations of Grain and Weak Link Properties in Bi1-xPbxSrCaCu1.8Oy.- Size Dependence of the ac Susceptibility and Critical Current Densities of YBa2Cu3O7-? Superconductors.- Y1-xGdxBa2Cu3O7-? and YBa2Cu3-xGdx O7-?: Similarities and Differences.- Electron Tunneling into Y1Ba2Cu3O7 Thin Films.- Model for Field-Dependent Microwave Absorption in Granular High-Tc Superconductors.- The Tunneling Gaps of YBa2Cu3O x: High-Tc Superconductors.- Superconducting Pair Density from Specific Heat Measurements.- III High-Energy Spectroscopies.- Electron Energy-Loss Studies on High-Tc Superconductors.- Electronic Structure of Transition Metal Compounds.- Gap Measurements of High-Tc Superconductors by High Resolution Electron Spectroscopy.-Electronic Structure of Bi2Sr2CaCu2O8 by Angle-Resolved Photoemission.- The Influence of Hybridization on the Spin and Charge Distribution in High-Tc Superconductors.- Local Partial Electronic Structure of High-Tc Superconductors and Related Oxides by X-Ray Emission Spectroscopy.- Polarized Cu-LIII XAS: Relation Between the Symmetry of the d-Holes and the Critical Temperature.- Calculation of Photoionization Cross Sections and Optical Conductivity for Models of High-Tc Superconductors.- Evidence for Jahn-Teller Distortions in Bi-Sr-Ca-Cu-O High-Tc Superconductors.- Electron Energy-Loss Studies on n-Type Doped Superconductors.- Does the Cu 4s Orbital Play a Role in Electron Doping of the Sm2-xCexCuO4-? Compound?.- Hole Doping in RE2NiO4+?.- Electron Energy-Loss Studies on La2-x.Srx CuO4.- Possible Sequence of Hole Injection in YBa2Cu3O6+y and Reverse Model of Metallization for La2CuO4/Nd2CuO4 by Impurity Hole/Electron Levels in the Band Gap.- IV Hyperfine Interactions, Magnetic Properties.- 205T1 NMR High-Tc Superconductors: Hyperfine Interactions of Localized and Delocalized Electrons.- Cu NQR and NMR Studies in Y-Ba-Cu-O Superconductors.- 89Y NMR Studies of the Electronic Properties of the 123 Compounds.- 17O NMR Investigation of the Electronic Structure of High-Tc Superconducting Oxides.- Magnetic Order in 123 Compounds as Seen by Cu NMR and NQR.- La and Cu NQR Relaxation in La2-xSrxCuO4: Cu2+ Localized Spin Dynamics and the Interplay with the O(2p) Holes.- Electric Field Gradient of Ba in YBa2Cu3Oy.- NQR Investigations on Oriented High-Tc Powder Samples.- A Local Method Study of the Magnetic Transition in YBa2(Cu1-xFex)3O6.- Electron Paramagnetic Resonance in Gd Doped YBa2Cu3O6.02.- EPR of a Paramagnetic Probe on the Surface of YBa2Cu3O7-?.- Pressure-InducedCharge Redistribution in ErBa2Cu3Ox Determined by Neutron Crystal-Field Spectroscopy.- Magnetic Anisotropy of High-Tc Superconductors in the Normal Phase.- V Optical Spectroscopy, Raman Scattering.- Optical Absorption in Non-BCS Superconductors.- Optical Reflectivity of Bi2Sr2CaCu2O8 Crystals.- Optical Excitations in Single Crystals of YBa2Cu3O7-? Between 5 meV and 6 eV.- Strong-Coupling Effects in the Infrared Conductivity of Superconductors.- Far-Infrared Excitations in YBa2Cu3O7-? Thin Films.- Low Energy Optical Excitations in High-Tc Superconducting Systems from Photomodulation Spectroscopy.- Raman Scattering and Infrared Spectroscopy of Substituted and Oxygen-Doped YBa2Cu3Oy.- Optical Investigation of the Superconducting Phase Transition in YBa2Cu3O7 Crystals.- FIR Measurements of Zn-Substituted YBCO Ceramics.- Anomalies of Infrared Active Phonons in Superconducting Tl2Ba2Ca2Cu3O10.- Probes of Superconductivity: Raman Scattering.- Theory of Raman Scattering in Superconductors.- A Comparative Raman Study of Classical and Oxide Superconductors.- Two-Magnon Scattering in the REBa2Cu3O6.- Resonant Raman Scattering in YBa2Cu3O7, YBa2Cu3O6 and YBa2Cu4O8.- FT Raman Scattering and Luminescence in BaBiO3.- VI Theory.- Charge Distribution and Electric Field Gradient Calculations for YBa2Cu3O7-x.- Total Energy Calculations of the Breathing Mode in BaBiO3.- Antiferromagnetism Beyond Band Theory.- Orbital Excitations in the Copper Oxides.- Orbital Dynamics and Jahn-Teller Coupling in the CuO2 Planes of the High-Tc Cuprates.- A Polaronic and Bipolaronic Theory of Superconductivity.- Magnetic Order and High-Tc Superconductivity.- Variational Monte Carlo Study for Generalized Flux Phases in the t-J Model.- Combined Phonon-Acoustic Plasmon Theory of High-Tc Copper Oxides.-Optical Phonons in High-Temperature Superconductors: Evidence for Strong Electron-Phonon Coupling.- Anharmonic Lattice Dynamics and Electron-Phonon Coupling in High-Tc Oxide Superconductors.- Energy Gap of Electronic Pair Formation in the One-Dimensional Attractive Hubbard Model.- The 2-D Hubbard-Peierls Model in the Self-Interaction Corrected Density Functional Formalism.- Observable Anomalies in Cuprate Superconductors Related to a Cross-Over from BCS Pairing to Bose-Einstein Condensation.- VII Related Topics.- Structural Aspects of Organic Superconductors.- Index of Contributors.