title: Electron-phonon interaction and antiferromagnetic correlations.
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.
authors.affiliation: Max-Planck Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Sangiovanni
authors.forename: O
authors.initials: O
authors.lastname: Gunnarsson
authors.forename: E
authors.initials: E
authors.lastname: Koch
authors.forename: C
authors.initials: C
authors.lastname: Castellani
authors.forename: M
authors.initials: M
authors.lastname: Capone