Beschreibung
Flux quantization experiments indicate that the carriers, Cooper pairs (pairons), in the supercurrent have charge magnitude 2e, and that they move independently. Josephson interference in a Superconducting Quantum Int- ference Device (SQUID) shows that the centers of masses (CM) of pairons move as bosons with a linear dispersion relation. Based on this evidence we develop a theory of superconductivity in conventional and mate- als from a unified point of view. Following Bardeen, Cooper and Schrieffer (BCS) we regard the phonon exchange attraction as the cause of superc- ductivity. For cuprate superconductors, however, we take account of both optical- and acoustic-phonon exchange. BCS started with a Hamiltonian containing "electron" and "hole" kinetic energies and a pairing interaction with the phonon variables eliminated. These "electrons" and "holes" were introduced formally in terms of a free-electron model, which we consider unsatisfactory. We define "electrons" and "holes" in terms of the cur- tures of the Fermi surface. "Electrons" (1) and "holes" (2) are different and so they are assigned with different effective masses: Blatt, Schafroth and Butler proposed to explain superconductivity in terms of a Bose-Einstein Condensation (BEC) of electron pairs, each having mass M and a size. The system of free massive bosons, having a quadratic dispersion relation: and moving in three dimensions (3D) undergoes a BEC transition at where is the pair density.
Produktsicherheitsverordnung
Hersteller:
Springer Verlag GmbH
juergen.hartmann@springer.com
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Autorenportrait
Inhaltsangabe1. Introduction. 2. Superconducting Transitions. 3. Bloch Electrons. 4. Phonon Exchange Attraction. 5. Quantum Statistical Theory. 6. Cooper Pairs (Pairons). 7. Superconductors at 0 K. 8. Quantum Statistics of Composites. 9. Bose-Einstein Condensation. 10. The Energy Gap Equations. 11. Pairon Energy Gaps and Heat Capacity. 12. Quantum Tunneling. 13. Flux Quantization. 14. Ginzburg-Landau Theory. 15. Josephson Effects. 16. Compound Superconductors. 17. Lattice Structures of Cuprates. 18. High-Tc Superconductors Below Tc. 19. Doping Dependence of Tc. 20. Transport Properties Above Tc. 21. Out-of-Plane Transport. 22. Seebeck Coefficient (Thermopower). 23. Magnetic Susceptibility. 24. Infrared Hall Effect. 25. d-Wave Cooper Pairs. 26. Connections with Other Theories. 27. Summary and Remarks. Appendix A. References. Bibliography. Index.
