Electron-phonon renormalization in cuprate superconductors.
Electron-phonon (e-ph) renormalization effects in a model cuprate system CaCuO2 are studied by employing density functional theory based methods. Whereas calculations based on the local spin-density approximation (LSDA) predicts negligible e-ph coupling effects of the half-breathing Cu-O bond stretching mode, the inclusion of a screened on-site Coulomb interaction (U) in the LSDA+U calculations greatly enhances the e-ph coupling strength of this mode. The full-breathing mode, on the other hand, shows a much weaker e-ph renormalization effect.
Zhang
Peihong
P
Department of Physics, University at Buffalo, SUNY, Buffalo, New York 14260, USA.
Louie
Steven G
SG
Cohen
Marvin L
ML