Electron-lattice interaction in cuprates: Effect of electron correlation

S. Ishihara, T. Egami, M. Tachiki

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

Strong electron-phonon coupling in the cuprates enhanced by electron correlation is suggested by exact diagonalization of a two-band Peierls-Hubbard Hamiltonian in one dimension. To describe the cuprates the band filling was chosen to be about, and the effect of changing the copper on-site repulsion and the charge density was examined. The zone-boundary longitudinal optical phonon modes were found to couple very strongly to holes as a result of charge transfer and changes in the local spin correlation induced by deformation. In particular the oxygen mode was found to soften significantly with doping, in agreement with the experimental observation. These results suggest strong synergetic effects of spin-charge-lattice coupling in this system. Implications of these effects to the superconductivity of the cuprates are discussed.

Original languageEnglish
Pages (from-to)3163-3172
Number of pages10
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume55
Issue number5
DOIs
Publication statusPublished - 1997 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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