Physics And Materials Science Of High Temperature Superconductors, Iv (nato Science Partnership Subseries: 3)

Five questions dominated the ARW on __Physics and Materials Science of____High Temperature Superconductors__, of which this book forms the permanent record. Briefly, these are: (i) How close are we to a unified theory? The consensus is that we are not. (ii) Flux pinning: can it be achieved in bulk materials? Still an open question. The following three questions are related. (iii) Can grain boundary contributions be brought under control? (iv) What is the real requirement for purity and general chemistry control? (v)What is the practical outlook for bulk products - tapes and wires? One of the conclusions is that the geometry and dimensions in thin films are the key parameters that facilitate the realization of high current densities and, consequently, their commercial application. On the other hand, the very large number of poorly understood microstructural, chemical and mechanical variables involved in the preparation of bulk materials are currently prohibiting large scale commercialization of wires and tapes. Front Matter....Pages i-xii Front Matter....Pages 1-1 Abrikosov Vortices Behavior in Different Pinning Potential for Moderately Anisotropic High-T c Superconductors....Pages 3-25 Microwave Dissipation and the Structure of the Vortex Lattice in Bi 2 Sr 2 CaCu 2 O 8+δ Single Crystals....Pages 27-43 The Flux Line Lattice States in Single-Crystalline Superconductors with Weak Pinning....Pages 45-55 Can We Achieve High In-Field J c at 77 K in Bi-Sr-Ca-Cu-O?....Pages 57-69 The Violation of the BCS Theory and the Extensions required to include the Effects of a nearby Phase Transition....Pages 71-92 Correlations Between Magnetostriction Jumps and Flux Instabilities in La 1.85 Sr 0.15 CuO 4 Single Crystal....Pages 93-100 Spin-Phonon Correlations and Optical Excitations in Oxides....Pages 101-113 Anisotropic Josephson Junctions on Stepped Surfaces of Bi 2 Sr 2 CaCu 2 O 8 Crystals: Evidence for the Symmetry of the Pair Wave Function....Pages 115-126 Front Matter....Pages 127-127 Material Science Aspects of HTS Technical Superconductors....Pages 129-150 Studies of Infinite-Layer, T’ -Phase, and 1-D-Ladder Copper-Oxide Compounds....Pages 151-160 Low-Temperature H-T Phase Diagram of Nd 1.85 Ce 0.15 CuO 4±δ ....Pages 161-178 Superconductivity in the La 2 CuO 4.03 Single Crystal System....Pages 179-185 Residual Microstresses, a-b Microcracking and Twin Structure in Oxygen Controlled Melt Grown NdBaCuO Superconductors....Pages 187-197 Microstructure and Superconducting Characteristics of Hg m Pb n Ba 2 Ca 2 Cu 3 O 8+δ ....Pages 199-204 Problems of Searching for Copper-Free HTSC Compositions....Pages 205-211 Front Matter....Pages 213-213 Pulsed Laser Deposition of Thin Films....Pages 215-231 Study of A-Axis Oriented YBa 2 Cu 3 O x Superconducting Thin Films on Y 2 O 3 /YSZ/Si Substrates....Pages 233-237 Structural Disorder Investigations of YBCO Thin Films Using Raman Microscopy....Pages 239-247 Penetration Depth Measurements in Epitaxiel YBCO Thin Films by the ESR Technique....Pages 249-256 Front Matter....Pages 257-257 HTS Multilayer Process Development for Digital Circuits....Pages 259-283 Front Matter....Pages 257-257 Evaluation of the Magnetic Properties of Nd-Based Superconductors....Pages 285-293 Noise Properties of HTSC Films for Bolometers on Si Membranes....Pages 295-309 Application of Ion Beam Etching to Investigate the Electrical Behaviour of Josephson Junctions....Pages 311-322 Synthesis of Bi-Sr-Ca-Cu-O Wires for Perspective Applications....Pages 323-334 Front Matter....Pages 335-335 Electron-Density Distribution and Valence-Bond Structure in Copper-Oxygen Linkage in YBa 2 Cu 3 O 6.9 and CuGeO 3 ....Pages 337-349 Back Matter....Pages 351-360 Five questions dominated the ARW on Physics and Materials Science of High Temperature Superconductors , of which this book forms the permanent record. Briefly, these are: (i) How close are we to a unified theory? The consensus is that we are not. (ii) Flux pinning: can it be achieved in bulk materials? Still an open question. The following three questions are related. (iii) Can grain boundary contributions be brought under control? (iv) What is the real requirement for purity and general chemistry control? (v)What is the practical outlook for bulk products - tapes and wires? One of the conclusions is that the geometry and dimensions in thin films are the key parameters that facilitate the realization of high current densities and, consequently, their commercial application. On the other hand, the very large number of poorly understood microstructural, chemical and mechanical variables involved in the preparation of bulk materials are currently prohibiting large scale commercialization of wires and tapes. Proceedings of the NATO Advanced Research Workshop, Strbske Pleso, Slovak Republic, July 21-27, 1996