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

A. Sherman; M. Schreiber

doi:10.1103/PhysRevB.52.10621

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

A. Sherman, M. Schreiber

DOI 10.1103/PhysRevB.52.10621 · Physical Review B

T1

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Abstract

We use the Eliashberg formalism for calculating Tc 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 Tc. But together with a moderate hole-phonon interaction it does lead to d-wave superconductivity at temperatures and hole concentrations observed in cuprates. High Tc are connected with a large density of states due to extended Van Hove singularities, a conformity of the two interactions for the d symmetry, and high phonon frequencies.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown