Enhancement of the electron-lattice interaction due to strong electron correlation

Sumio Ishihara, T. Egami, M. Tachiki

Research output: Contribution to journalArticle

72 Citations (Scopus)

Abstract

Effects of strong electron correlation on the electron-lattice interaction are studied by means of the exact diagonalization method for a finite-size cluster system. A simple two-component tight-binding Hamiltonian with the intrasite and intersite Coulomb repulsions is adopted. Upon changing the correlation energy (U) and the energy-level separation (Δ), the system is found to undergo a transition between the ionic insulating phase and the Mott insulating phase. Near the phase boundary the system becomes unstable under a small perturbation and a dramatic enhancement of the electron-lattice interaction is observed. Spin and charge properties are also strongly affected by the lattice distortion in a crossover region. The implication of the calculated results to the origins of the displacive-type ferroelectricity and the superconductivity in transition-metal oxides is discussed.

Original languageEnglish
Pages (from-to)8944-8954
Number of pages11
JournalPhysical Review B
Volume49
Issue number13
DOIs
Publication statusPublished - 1994 Jan 1

ASJC Scopus subject areas

  • Condensed Matter Physics

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