Studies of High Temperature Superconductors, Volume 29

Front Cover
A. V. Narlikar
Nova Publishers, Jan 1, 1999 - Science - 246 pages
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Six papers by physicists from the Japan, India, Brazil and the US address some of the broad frontal issues of superconductivity, which include the mechanisms of high-temperature superconductivity, extra-high-temperature phenomena, the normal state pseudogap, the observations of the isotope effect in a host of different superconducting systems and their explanations, and the unusual features of strongly correlated electron systems like heavy fermions. Two extended papers explore the importance of positron annihilation and using electron spin resonance techniques to study superconducting materials. The treatments should be accessible to working scientists and engineers and to graduate students of physics, chemistry, materials science, solid-state electronics, and other disciplines.
  

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Contents

High Tc State Gap and Anisotropic Coupling from the Low Symmetry Lattice Polarization
1
The case for the low symmetry polarization state
4
The low symmetry state and the gap data
5
Interpretation from the intrinsic lattice
8
Temperature variable isotope effect and gap ratio and the lattice counteraction
10
Microscopic interaction and state in the low symmetry framework
12
Coupling to the valence band state
13
Uniqueness of the approach
16
High Tc superconductivity mechanism
117
Comparison with other theories
123
Pseudogap origin and consequences
126
Conclusion
135
Appendix
137
References
140
Probing HTSC by Positron Lifetime and Doppler Broadening Investigations
147
Probing solids with positrons
149

Conclusion
17
Polarization dissipationscattering offset in the ThronberFeynman state
18
Irreversible intrinsic interaction from low spatial symmetry
19
References
20
Isotope Effect In Superconducting Transition Temperature
23
Experimental observations
28
Theoretical studies
32
Conclusions
53
References
54
NMR Study of Strongly Correlated Superconductors Heavy Fermion High Tc and Related Materials
59
Mechanism of the superconductivity in the highTc cuprate
83
Spin gap in highTc superconductors
97
Hole distribution
101
Conclusion
104
References
106
Spin Glass Freezing and Mechanism of High Tc Superconductivity
113
Spin glass cluster phase transition
114
Positron annihilation in HTSC and conventional Superconductors
156
Early positron probing of HTSC samples
157
Current experiments on positron lifetime across the superconducting transition
165
Current observations of S vs T minima in the Tcregion
174
Conclusions and future directions
180
References
183
ESR in Metals and Superconductors
187
Theory of ESR linewidths in metals
190
Relevant models for superconductivity
196
Pseudometallic systems
199
Metals and alloys
202
Superconductors
207
Spin dynamics of high temperature superconductors
218
Conclusions
237
Subject Index
243
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