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Interplay of Electron-Phonon Interaction and Electron Correlation in High Temperature Superconductivity

Sumio Ishihara·Naoto Nagaosa
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Abstract

We study the electron-phonon interaction in the strongly correlated superconducting cuprates. Two types of the electron-phonon interactions are introduced in the $t-J$ model; the diagonal and off-diagonal interactions which modify the formation energy of the Zhang-Rice singlet and its transfer integral, respectively. The characteristic phonon-momentum $(\vec q)$ and electron-momentum $(\vec k)$ dependence resulted from the off-diagonal coupling can explain a variety of experiments. The vertex correction for the electron-phonon interaction is formulated in the SU(2) slave-boson theory by taking into account the collective modes in the superconducting ground states. It is shown that the vertex correction enhances the attractive potential for the d-wave paring mediated by phonon with $\vec q=(π(1-δ), 0)$ around $δ\cong 0.3$ which corresponds to the half-breathing mode of the oxygen motion.

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Sumio Ishihara, Naoto Nagaosa. 2003-11-10. Interplay of Electron-Phonon Interaction and Electron Correlation in High Temperature Superconductivity. https://doi.org/10.1103/physrevb.69.144520

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