Ebook: Dynamics of Magnetic Fluctuations in High-Temperature Superconductors

This NATO Advanced Research Workshop was held at a time when there was little consensus as to the mechanism for high temperature superconductivity, in the context of a world undergoing major changes in its political alignments and sense of the possibility for the future. It was characterized by generosity in the sharing of our uncertainties and speculations, as was appropriate for both the subject matter and the context. The workshop was organized, of necessity around the experimental work, as is this volume. Where the theoretical work is directly relevant to particular experiments, it is included in the appropriate sections with them. Most of the participants felt strongly that magnetic fluctuations played an important role in the mechanism for high T c, although with the exception of the IlS R work reported by Luke showing results inconsistent with the anyon picture, and the work on flux phases by Lederer, the mechanism remained an issue in the background. A major focus was the phenomenological interpretation of the NMR data.

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Content:
Front Matter....Pages i-xii
Antiferromagnetic Spin Fluctuations in Cuprate Superconductors....Pages 1-19
Neutron Scattering Measurements of the Magnetic Excitations of High-Temperature Superconducting Materials....Pages 21-34
Disordered, Low Energy Component of the Magnetic Response in Both Antiferromagnetic and Superconducting Y-Ba-Cu-O Samples....Pages 35-49
Local Hyperfine Interactions of Delocalized Electron Spins: 205TL Investigations in TL Containing High-Tc Superconductors....Pages 51-59
Weak Coupling Analysis of Spin Fluctuations in Layered Cuprates....Pages 61-71
Influence of the Antiferromagnetic Fluctuations on the Nuclear Magnetic Resonance in the CU-O High Temperature Superconductors....Pages 73-85
Microscopic Models for Spin Dynamics in the CuO2-planes with application to NMR....Pages 87-96
On the Phase Diagram of Bismuth Based Superconductors....Pages 97-109
Raman Scattering from Spin Fluctuations in the Cuprates....Pages 111-122
Electronic Structure of Bi2 Sr2 CaCu2 O8 Single Crystals at the Fermi Level....Pages 123-125
Calculation of Photoemission Spectra for the t-J Model and the Extended Hubbard Model....Pages 127-137
Microwave Absorption of Superconductors in Low Magnetic Fields....Pages 139-146
Magnetic Properties of a Granular Superconductor....Pages 147-157
Thermodynamic Fluctuations and their Dimensionality in Ceramic Superconductors Out of Transport Properties Measurements....Pages 159-167
Models of High Temperature Superconductors....Pages 169-173
BCS Theory Extended to Anisotropic and Layered High-Temperature Superconductors....Pages 175-187
Correlated Electron Motion, Flux States and Superconductivity....Pages 189-196
Orbital Dynamics and Spin Fluctuations in Cuprates....Pages 197-206
Magnetic Frustration Model and Superconductivity on Doped Lamellar CuO2 Systems....Pages 207-215
Strong Coupling Regime in the Hubbard Model at Low Densities....Pages 217-218
How Good is the Strong Coupling Expansion of the Two Dimensional Hubbard Model?....Pages 219-231
The Hubbard Model for n? 1.0 : New Preliminary Results....Pages 233-239
Exact Microscopic Calculation of Spin Wave Frequencies and Linewidths in the Two-Dimensional Heisenberg Antiferromagnet at Low Temperature....Pages 241-252
Magnetic Excitations in the Disordered Phase of the 2-D Heisenberg Antiferromagnet....Pages 253-254
Exact Diagonalization Studies of Quasiparticles in Doped Quantum Antiferromagnets....Pages 255-259
Copper Spin Correlations Induced By Oxygen Hole Motion....Pages 261-265
Spin Polarons in the t - J Model....Pages 267-273
Analytic Evaluation of the 1-Hole Spectral Function for the 1-D t-J Model in the Limit J ? 0....Pages 275-281
Doping Effects on the Spin-Density-Wave Background....Pages 283-293
Phase Separation in a t - J Model....Pages 295-305
Spiral Magnetic Phases as a Result of Doping in High Tc Compounds....Pages 307-318
Back Matter....Pages 319-327
....Pages 329-334