BCS pairing in a correlated narrow-band metal
Journal Article
·
· Physical Review, B: Condensed Matter; (United States)
- Department of Physics, Indian Institute of Technology, New Delhi 110016 (India)
- Department of Physics and Chemistry, Purdue University Calumet, Hammond, Indiana 46323-2094 (United States)
A theoretical study of BCS pairing in an extended Hubbard model with on-site repulsion ([ital U]) and a BCS pairing field ([ital V]) is presented. Treating the effect of [ital U] in the Gutzwiller approximation, we study the effect of increasing [ital U] in the Fermi-liquid phase, on the BCS pairing due to [ital V]. It is found that the superconducting energy gap ([Delta]) is strongly enhanced in the correlated metallic phase near half-filling of the band due to the localization effects of [ital U]. Further, the ground state is found to be superconducting even when [vert bar][ital V][vert bar][lt][ital U], contrary to the prediction in a Hartree-Fock treatment.
- OSTI ID:
- 5429769
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Vol. 48:9; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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