Competition between electron-phonon attraction and weak Coulomb repulsion

Details Competition between electron-phonon attraction and weak Coulomb repulsion Competition between electron-phonon attraction and weak Coulomb repulsion

1995-02-23

arxiv.org/abs/cond-mat/9502098v1

Physics

Condensed Matter

13 pages in ReVTex including 3 encapsulated postscript files (embedded in the text). The encapsulated postscript files are com

Scientific paper

10.1103/PhysRevLett.75.2570

The Holstein-Hubbard model is examined in the limit of infinite dimensions. Conventional folklore states that charge-density-wave (CDW) order is more strongly affected by Coulomb repulsion than superconducting order because of the pseudopotential effect. We find that both incommensurate CDW and superconducting phases are stabilized by the Coulomb repulsion, but, surprisingly, the commensurate CDW transition temperature is more robust than the superconducting transition temperature. This puzzling feature is resolved by a detailed analysis of perturbation theory.

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