Pairing interaction mediated by the Cu-O charge-transfer oscillations associated with LO phonons in oxide superconductors and their high-Tc superconductivity

M. Tachiki, S. Takahashi

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)

Abstract

The mechanism for the high-Tc superconductivity in the oxide superconductors is theoretically investigated. The interplay of the Cu-O electron transfer and the Coulomb interaction acting on electrons produces large charge fluctuations with low frequencies in the oxides. The LO phonons strongly interact with the charge fluctuations and generate the Cu-O charge-transfer oscillations with frequencies close to the LO phonons. The amplitudes of the oscillations are extremely large. The experimental results of electron-energy-loss spectroscopy and neutron scattering provide evidence to show the large amplitude of the charge oscillations in the oxides. The interaction mediated by the charge oscillations yields a strong attractive force acting between electrons. We suggest that the attractive force is responsible for the high-Tc superconductivity in the oxides.

Original languageEnglish
Pages (from-to)218-224
Number of pages7
JournalPhysical Review B
Volume38
Issue number1
DOIs
Publication statusPublished - 1988 Jan 1

ASJC Scopus subject areas

  • Condensed Matter Physics

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