Competition between electron-phonon attraction and weak Coulomb repulsion
Condensed Matter
2016-08-31 v1
Abstract
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.
Cite
@article{arxiv.cond-mat/9502098,
title = {Competition between electron-phonon attraction and weak Coulomb repulsion},
author = {J. K. Freericks and Mark Jarrell},
journal= {arXiv preprint arXiv:cond-mat/9502098},
year = {2016}
}
Comments
13 pages in ReVTex including 3 encapsulated postscript files (embedded in the text). The encapsulated postscript files are compressed and uuencoded after the TeX file.