Electron–phonon interaction in correlated cuprate superconductors

Abstract

Abstract Electron–phonon interaction in the strongly correlated superconducting cuprates is studied. Two types of the electron–phonon interactions, i.e. the diagonal and off-diagonal interactions which modify the formation energy of the Zhang–Rice singlet and its transfer integral,, respectively, are introduced in the t – J model. The characteristic phonon-momentum and electron-momentum dependence which are resulted from the off-diagonal coupling can explain a variety of experiments. We show that the vertex correction for the electron–phonon interaction enhances the attractive potential for the d -wave pairing.