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Phys Rev Lett. 2006 Jul 28;97(4):046404. Epub 2006 Jul 26.

Electron-phonon interaction and antiferromagnetic correlations.

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1
Max-Planck Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.

Erratum in

  • Phys Rev Lett. 2006 Aug 4;97(5):059901.

Abstract

We study effects of the Coulomb repulsion on the electron-phonon interaction (EPI) in the Holstein-Hubbard model, using the antiferromagnetic (AF) dynamical mean-field approximation. AF correlations strongly enhance EPI effects on the electron Green's function with respect to the paramagnetic correlated system, but the net effect of the Coulomb interaction is a moderate suppression of the EPI. Doping leads to additional suppression. In contrast, the Coulomb interaction strongly suppresses EPI effects on phonons, but the suppression weakens with doping.

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