Published October 1996
| Version v1
Journal article
Strong-coupling expansions for the anharmonic Holstein model and for the Holstein-Hubbard model
Creators
- 1. Department of Physics, Georgetown University, Washington, D.C. 20057-0995 (United States)
- 2. Solid State Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6030 (United States)
- 3. Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1200 (United States)
Description
A strong-coupling expansion is applied to the anharmonic Holstein model and to the Holstein-Hubbard model through fourth order in the hopping matrix element. Mean-field theory is then employed to determine transition temperatures of the effective (pseudospin) Hamiltonian. We find that anharmonic effects are not easily mimicked by an on-site Coulomb repulsion and that anharmonicity strongly favors superconductivity relative to charge-density-wave order. Surprisingly, the phase diagram is strongly modified by relatively small values of the anharmonicity. copyright 1996 The American Physical Society
Additional details
Publishing Information
- Journal Title
- Physical Review. B, Condensed Matter
- Journal Volume
- 54
- Journal Issue
- 13
- Journal Page Range
- p. 9372-9384.
- ISSN
- 0163-1829
- CODEN
- PRBMDO
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 28011622
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Descriptors DEI
- ANHARMONIC OSCILLATORS; ELECTRON-PHONON COUPLING; HUBBARD MODEL; LATTICE VIBRATIONS; MEAN-FIELD THEORY; PHASE DIAGRAMS; SERIES EXPANSION; STRONG-COUPLING MODEL; SUPERCONDUCTIVITY
- Descriptors DEC
- COUPLING; CRYSTAL MODELS; DIAGRAMS; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; INFORMATION; MATHEMATICAL MODELS; PARTICLE MODELS; PHYSICAL PROPERTIES