Strong-coupling superconductivity in the two-dimensional {ital t}-{ital J} model supplemented by a hole-phonon interaction

Journal Article · Sun Oct 01 04:00:00 EDT 1995 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.52.10621· OSTI ID:239390

Sherman, A ^[1]; Schreiber, M ^[2]

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1. Institute of Physics, Estonian Academy of Sciences, Riia 142, EE2400 Tartu (Estonia)
2. 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, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 14 Vol. 52; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
D WAVES
ELECTRON-PHONON COUPLING
ENERGY SPECTRA
ENERGY-LEVEL DENSITY
GORKOV-ELIASHBERG THEORY
HIGH-TC SUPERCONDUCTORS
MAGNONS
STRONG-COUPLING MODEL
TRANSITION TEMPERATURE
TWO-DIMENSIONAL CALCULATIONS