Since the discovery of high temperature superconductivity, a tidal wave of res­ earch into the newly found phenomena took off in several directions. The theor­ ists began to examine BSC and its implications. Mostly everyone was syn­ thesizing materials.The experimentalists were studying relations among electri­ cal and magnetic properties while the pure materials scientists began to exam­ ine the microstructures, and the relations of processing to one or two measurab­ le parameters. The engineering and systems community were preparing real conductors and designing the needed components. Each of the communities was holding between two and three annual meetings to discuss most recent re­ sults. As work progressed, and promised applications did not materialize, it became apparent to us that the physics and materials science communities needed to establish solid communication lines. This NATO Advanced Study Institute was thus conceived and organized. This was a two week summer school, which 15 internationally acclaimed physicists and material scientists were invited to par­ ticipate in the capacity of Lecturers. Eighty students, from 12 different countries, also attended.

PREFACE.- Opening Remarks.- The Renaissance of Superconductivity.- Theory.- Properties of the High Tc Superconductors.- Fluctuational Torque for High Temperature Superconductors in Strong Magnetic Field.- A Jahn-Teller Theory for Superconductivity of the Cuprates.- Magnetic Properties of the High-Temperature Superconductors.- Superconducting and Antiferromagnetic Instabilities in the Slave Boson: Approach to the Hubbard Model: Functional Integral Formulation.- High-Temperature Superconductivity in Light of Bisoliton Model.- Open Orbit and Magnetic Breakdown Effect.- Visualization of Magnetic Flux Penetration and Trapping in High-Temperature Superconductors.- Persistent Currents in Mesoscopic Rings.- Possible Interplay of Intrinsic Doping and Lattice Anharmonicity in High Temperature Superconductors.- Materials Science and Chemistry.- Microstructure Property Relationships for High Tc Superconductors.- Electron Microscopic Studies of High Tc-Superconductors.- First Co-Ordination Symmetry in the Structure of High Critical Temperature Superconductors.- The Growth of Large Single Crystals, Textured Materials and the Electromagnetic Shielding Effectiveness of High Tc Superconductors.- Structure-Property Relationships in High Tc Copper Oxides Containing Thallium, Bismuth and Lead.- Oxygen Stoichiometry, Structural Transitions, and Thermodynamic Behavior in the YBa2Cu3Ox System.- Preparation of Bi-Sr-Ca-Cu-O Superconducting Materials: Glass Crystallisation Route Versus Solid State Reaction and Sintering Route.- Oxygen Evolution in High Tc Superconductors.- Effects of Oxygen Stoichiometry on Superconducting Properties of the ceramics ABa2Cu3O7-? with A=Yb, Y, Gd and La.- Thin Film Superconductors.- The Sputter Deposition of Superconducting Ceramics.- Properties of YBa2Cu3O7Thin Films.- Thin-Films Bi-Sr-Ca-Cu-0 Superconductors Preparation using Single Resistive Evaporation Source.- YBaCuO Thin Film Preparation by Laser Ablation and Sputtering.- Silver Doped YBa2Cu3O7-x in Films Prepared by Sequential Evaporation of CuOX/Y2O3/BaF2/Ag.- Anisotropy of the Optical Properties of YBa2Cu3O7-x and Bi2(Sr1-xCax)Cu2O8+? Single Crystals and Thin Films.- Microwave Properties of High Tc Microbridges.- YBACUO Thin Films Prepared by Organornetallic Aerosol Deposition.- Crystal and Bulk Superconductors.- Systematics of ?Sr-Measured Penetration Depths in Bi-Sr-Ca-Cu-O.- Flux Distribution in a Single Crystal of YBa2Cu3O7.- Mid-Infrared Reflectivity of Single Crystal YBa2Cu3O7 and Related Compounds.- EPR and Microwave Absorption Measurements on Crystal Tl2Ca2Ba2Cu3O10.- Investigation of the Temperature and Small Field Dependence of the I-V Curves of the High Tc Superconductor YBa2Cu3O7-?.- Critical Current and Electronic Properties of YBaCuO-Ag Compounds.- Critical-Current Density Determination from Low-Field Magnetic Measurements for YBCO Superconductors.- Development of High-Tc-Superconductor Wires.- Hysteresis of Critical Current in YBa2Cu3O7-x-Ag.- Grain Connectivity and Superconductivity of Bulk High Temperature Superconductors.- Synthesis and Characterization of Composite (Ag/123) High Temperature Superconductor wires.- Electronic Structure of Twin Boundaries in YBa2Cu3O7.- Thermodynamic Fluctuations and Fractal Homogeneous Critical Behavior of Ceramic High Tc Superconductors Out of Electrical Resistivity and Thermoelectric Power Measurements.- Preparation and Magnetic Studies of Single Crystalline (Bi, Pb)SrCaCuO Superconductors.- Raman Scattering From Metal (Co, Ni and Zn)-Substituted YBa2Cu3O7-?.- NMR and NQR of HTc Superconductors.- Anisotropyof the Kinetic and Optical Properties of Bi2Sr2CaCu2O8 Single Crystals.- Elastic and Anelastic Effects in the Orthorhombic and Tetragonal Forms of GdBa2Cu3O7-x as a Function of Pressure and Temperature.- The Effect of Fast Neutron Irradiation Damage on the 110 K Phase of the Bi-Pb-Sr-Ca-Cu-O System.- Applications of Superconductivity.- Operation of Ceramic rf Squids and Dynamics of Magnetic Flux Vortices.- Superconductivity in Medicine.- Late Contributions.- Superconductivity by Quantum Size Effect.- Density and Texture Dependence of Grain Coupling in Sintered Y-Ba-Cu-O Superconductors.- A Model for the Bulk Processing of High Temperature Superconductive ceramic Powders and Parts.- LIST OF PARTICIPANTS.