Strong-coupling superconductivity in the two-dimensional {ital t}-{ital J} model supplemented by a hole-phonon interaction
- Institute of Physics, Estonian Academy of Sciences, Riia 142, EE2400 Tartu (Estonia)
- Institut fuer Physik, Technische Universitaet, D-09107 Chemnitz (Germany)
We use the Eliashberg formalism for calculating {ital T}{sub {ital c}} in a model of cuprate perovskites with pairing mediated by both magnons and apex-oxygen vibrations. The influence of strong correlations on the energy spectrum is taken into account in the spin-wave approximation. It is shown that the hole-magnon interaction alone cannot yield high {ital T}{sub {ital c}}. But together with a moderate hole-phonon interaction it does lead to {ital d}-wave superconductivity at temperatures and hole concentrations observed in cuprates. High {ital T}{sub {ital c}} are connected with a large density of states due to extended Van Hove singularities, a conformity of the two interactions for the {ital d} symmetry, and high phonon frequencies.
- OSTI ID:
- 239390
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 52, Issue 14; Other Information: PBD: 1 Oct 1995
- Country of Publication:
- United States
- Language:
- English
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