Superconductivity in a strongly correlated one-band system
- Institute of Physics, Maria Curie Skl/odowska University, Pl. M.C. Skl/odowskiej 1, 20-031 Lublin (Poland)
- Fundamental Physics Section, Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki 305 (Japan)
We study superconductivity in the extended Hubbard model with a strong on-site repulsion {ital U} and weak attractive density-density interaction {ital V}{sub {ital ij}}. The electron correlation effects, beyond the weak-coupling regime of {ital U}, are included approximately by employing Hubbard decoupling approximations. The formulas for superconducting transition temperature {ital T}{sub {ital c}} of the present approach are compared to those obtained with the strong-coupling expansion and slave-boson techniques. The methods share some common features. We discuss behavior of {ital T}{sub {ital c}} for superconducting phases with {ital s}- and {ital d}-wave symmetry of the superconducting order parameter. In contrast to the mean-field treatment of {ital U}, we find that the strong on-site repulsion does not destroy superconductivity induced by {ital V}{sub {ital ij}}{lt}0 even when {ital U}{gt}{vert_bar}{ital V}{sub {ital ij}}{vert_bar}. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 286665
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 5 Vol. 54; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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