Superconductivity and antiferromagnetism for an extended Hubbard Hamiltonian: Role of correlated hopping in a single-band model

Journal Article · Tue Jun 01 04:00:00 EDT 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.47.14417· OSTI ID:6460312

Lara, G A; Cabrera, G G ^[1]

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1. Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas (UNICAMP), Caixa Postal 6165, Campinas 13083-970, Sao Paulo (Brazil)

An extended Hubbard model for a single band, including Coulomb repulsion and correlated hopping between nearest neighbors, is studied using a generalized mean-field approach. Antiferromagnetism and superconductivity are probed for arbitrary occupation number, near and away from half filling. Binding of pairs in the superconducting state of this purely repulsive model is mediated by the correlated hopping in the form of a covalent-bond configuration, with partial intrasite and intersite pairings. A region of coexistence is conjectured, the superconductivity being suppressed by the saturation of the staggered magnetic moment. Singlet superconducting nonmagnetic states are obtained for the almost-empty- or full-band cases. On the other hand, antiferromagnetism induces mixed [ital s]- and [ital p]-type superconductivities in the neighborhood of half filling.

• OSTI ID: 6460312
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 47:21; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETISM
CORRELATIONS
CRYSTAL MODELS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC STRUCTURE
HIGH-TC SUPERCONDUCTORS
HUBBARD MODEL
MAGNETIC MOMENTS
MAGNETISM
MATHEMATICAL MODELS
MEAN-FIELD THEORY
PHYSICAL PROPERTIES
SUPERCONDUCTIVITY
SUPERCONDUCTORS