Electron-lattice interaction in cuprates: Effect of electron correlation

Journal Article · Sat Feb 01 04:00:00 EST 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.55.3163· OSTI ID:450374

Ishihara, S ^[1]; Egami, T ^[1]; Tachiki, M ^[2]

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1. Department of Materials Science and Engineering and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6272 (United States)
2. Institute for Materials Research, Tohoku University, Sendai 980 (Japan)

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 (3)/(4), 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. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 450374
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 5 Vol. 55; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHARGE EXCHANGE
CUPRATES
ELECTRON CORRELATION
ELECTRON-PHONON COUPLING
HIGH-TC SUPERCONDUCTORS
HUBBARD MODEL
PEIERLS METHOD
SIZE
SUPERCONDUCTIVITY