Interplay of electron-phonon interaction and electron correlation in high-temperature superconductivity

Sumio Ishihara, Naoto Nagaosa

Research output: Contribution to journalArticlepeer-review

88 Citations (Scopus)

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 (q) and electron-momentum (k) dependence that 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 q = [π(1-δ),0] around δ ≅ 0.3, which corresponds to the half-breathing mode of the oxygen motion.

Original languageEnglish
Article number144520
Pages (from-to)144520-1-144520-13
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume69
Issue number14
DOIs
Publication statusPublished - 2004 Apr

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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