Electronic correlations, electron-phonon interaction, and isotope effect in high-Tc cuprates

Details Electronic correlations, electron-phonon interaction, and isotope effect in high-Tc cuprates Electronic correlations, electron-phonon interaction, and isotope effect in high-Tc cuprates

1999-04-26

arxiv.org/abs/cond-mat/9904374v1

Physics

Condensed Matter

Superconductivity

14 pages, 7 figures

Scientific paper

10.1103/PhysRevB.60.1296

Using a large-N expansion we present and solve the linearized equation for the superconducting gap for a generalized t-J model which also contains phonons within a Holstein model. The leading Tc has d-wave symmetry with phonons giving a positive contribution to Tc. The corresponding isotope coefficient is very small at optimal doping and increases towards the classical value 1/2 with increasing dopings similar as in many cuprates.

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