Theory of superconductivity at high temperatures
- 22 Downloads
Superconductivity is generally explained by an electron-lattice interaction which results in the pairing of electrons and the condensation of these pairs into a state of lower entropy. In high-temperature superconductivity the pairs consist of hybrids in which the top of the oxygen band of the crowded perovskite layer is mixed with the bottom of unoccupiedd- orf-bands from monoxide layers in the crystal. Only electrons and phonons with low quasi-momentum (k) values participate. This makes it possible to localize the lattice perturbation into broad regions in which the van der Waals forces are reduced and the perovskite planes are contracted. The low entropy state associated with superconductivity manifests itself as the formation of a superlattice of lattice distortions which is in actual motion in the current-carrying states. The observability of this superlattice is discussed.
Key wordsTheory of superconductivity high-temperature superconductivity superlattice of lattice distortions
Unable to display preview. Download preview PDF.
- 1.J. L. Bardeen, L. N. Cooper, and J. R. Schrieffer,Phys. Rev. 108, 1175 (1957).Google Scholar
- 2.W. E. Pickett,Rev. Mod. Phys. 61, 433 (1989).Google Scholar
- 3.D. R. Hamann and L. F. Mattheiss,Phys. Rev. B 38, 5138 (1988).Google Scholar
- 4.R. A. Fisher, J. E. Gordon, and N. E. Phillips,J. Superconduct. 1, 231 (1988).Google Scholar
- 5.R. E. Peierls,Quantum Theory of Solids (Oxford University Press, New York, 1955).Google Scholar