Ebook: Oxygen Disorder Effects in High-T c Superconductors
- Tags: Characterization and Evaluation of Materials
- Year: 1990
- Publisher: Springer US
- Edition: 1
- Language: English
- pdf
The papers in this book represent the proceedings for the International Conference on Oxygen Disorder Effects in High~Tc Superconductors, held April 18-21, 1989 at the International Centre for Theoretical Physics, Trieste, Italy. It was recognized very early in the field of ceramic superconductors that oxygen plays a crucial role as far as the physical properties of these ma terials are concerned. The preparation requires special heating and cooling cycles which allow proper uptake of oxygen, relationships were found between the oxygen concentration and the superconducting transition temperature in many of the compounds and quite recently it was recognized that many (if not all) of the compounds present oxygen ordering in the intercalating planes. Moreover, it seems that the presence of superconductivity is strongly correlated with the presence of orthorhombic phases although several groups have also claimed the presence of superconductivity in tetragonal phases. Whether oxygen ordering plays or not a crucial role for the superconductivity remains to be seen. However it is clear that the ordering of oxygens and their thermodynamic properties is an interesting subject on its own right. All these reasons led us to organize a Conference on Oxygen Disorder Effects in High-Tc Superconductors in attempt to identify unsolved problems and to have an open discussion of the presently known facts.
Content:
Front Matter....Pages i-ix
Powder Neutron Diffraction Study of the Structural Phase Diagram of the Ba1?xKxBiO3 System....Pages 1-7
Electron Microscopic Studies of Oxygen Ordering Phenomena in YBa2Cu3O7-? ....Pages 9-45
Local Atomic Displacements in High Tc Oxides Studied by Pulsed Neutron Scattering....Pages 47-54
Oxygen Stoichiometry and Superconductivity in Ceramics....Pages 55-62
Oxygen Ordering in YBa2Cu3O6+? : A Phase Diagram Calculation....Pages 63-73
States of Oxygen Ordering in YBa2Cu3Oz ....Pages 75-88
Effects of Correlation and Disorder on the Electronic Properties of RBa2 Cu3 O6+x ....Pages 89-99
Tight-Binding Investigation of the Electronic Properties of Ordered and Disordered Defects in the YBaCuO System....Pages 101-116
Electronic Structure of the Cuprate and Bismuthate Superconductors....Pages 117-125
Flux Pinning and Thermally Activated Flux Flow Behavior in Single Crystalline YBa2Cu3O7 and Bi2Sr2CaCu2O8 ....Pages 127-139
Superconducting Phase Diagram of a High Tc Ceramic....Pages 141-149
Magnetic Ordering of Rare Earth (R) Ions in RBa2Cu3O7?? Compounds (R = Nd, Sm, Dy, Er; 0 ? ? ? 1)....Pages 151-162
Spin and Hole Dynamics in Doped Anisotropic Heisenberg Antiferromagnets....Pages 163-167
Spin-Hole Model with Magnetic Vortex-Antivortex Pairing Mechanism for Doped La2CuO4 ....Pages 169-179
Study of Superconducting ANsD Parent Phases by Chemical Modifications....Pages 181-188
Experimental Study of High Temperature Superconductors through Substitution....Pages 189-200
Theoretical Study of Oxygen Disorder Effects in YBa2(Cu1?xMx)3O7+y (M = Al, Co, Fe, Ga)....Pages 201-209
Characterization of Twins and Twin Domains of YBaCuO Single Crystals by Micro-Raman Scattering....Pages 211-220
Oxygen Disorder Effects in High Tc Superconductors, 1989....Pages 221-225
Back Matter....Pages 227-231
Content:
Front Matter....Pages i-ix
Powder Neutron Diffraction Study of the Structural Phase Diagram of the Ba1?xKxBiO3 System....Pages 1-7
Electron Microscopic Studies of Oxygen Ordering Phenomena in YBa2Cu3O7-? ....Pages 9-45
Local Atomic Displacements in High Tc Oxides Studied by Pulsed Neutron Scattering....Pages 47-54
Oxygen Stoichiometry and Superconductivity in Ceramics....Pages 55-62
Oxygen Ordering in YBa2Cu3O6+? : A Phase Diagram Calculation....Pages 63-73
States of Oxygen Ordering in YBa2Cu3Oz ....Pages 75-88
Effects of Correlation and Disorder on the Electronic Properties of RBa2 Cu3 O6+x ....Pages 89-99
Tight-Binding Investigation of the Electronic Properties of Ordered and Disordered Defects in the YBaCuO System....Pages 101-116
Electronic Structure of the Cuprate and Bismuthate Superconductors....Pages 117-125
Flux Pinning and Thermally Activated Flux Flow Behavior in Single Crystalline YBa2Cu3O7 and Bi2Sr2CaCu2O8 ....Pages 127-139
Superconducting Phase Diagram of a High Tc Ceramic....Pages 141-149
Magnetic Ordering of Rare Earth (R) Ions in RBa2Cu3O7?? Compounds (R = Nd, Sm, Dy, Er; 0 ? ? ? 1)....Pages 151-162
Spin and Hole Dynamics in Doped Anisotropic Heisenberg Antiferromagnets....Pages 163-167
Spin-Hole Model with Magnetic Vortex-Antivortex Pairing Mechanism for Doped La2CuO4 ....Pages 169-179
Study of Superconducting ANsD Parent Phases by Chemical Modifications....Pages 181-188
Experimental Study of High Temperature Superconductors through Substitution....Pages 189-200
Theoretical Study of Oxygen Disorder Effects in YBa2(Cu1?xMx)3O7+y (M = Al, Co, Fe, Ga)....Pages 201-209
Characterization of Twins and Twin Domains of YBaCuO Single Crystals by Micro-Raman Scattering....Pages 211-220
Oxygen Disorder Effects in High Tc Superconductors, 1989....Pages 221-225
Back Matter....Pages 227-231
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