Superconducting states of an extended Hubbard model

Journal Article · Wed Aug 01 04:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.42.2259· OSTI ID:6419172

Coppersmith, S N ^[1]

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1. AT T Bell Laboratories, Murray Hill, NJ (USA)

The variational Monte Carlo method is used to study possible superconducting states of a two-dimensional extended Hubbard model on a copper-oxygen lattice. It is found that {ital d}-wave and extended {ital s}-wave superconducting variational wave functions can have lower energy than the corresponding normal state for different parameter regions, while simple {ital s}-wave superconductivity is never favored. Increasing the nearest-neighbor repulsion and decreasing the copper-oxygen level separation can promote extended {ital s}-wave superconductivity and inhibit {ital d}-wave superconductivity.

• OSTI ID: 6419172
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 42:4; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

656100* -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTAL MODELS
D WAVES
HIGH-TC SUPERCONDUCTORS
INTERACTIONS
MATHEMATICAL MODELS
MONTE CARLO METHOD
PAIRING INTERACTIONS
PARTIAL WAVES
S WAVES
SUPERCONDUCTORS
TWO-DIMENSIONAL CALCULATIONS