Odd-parity singlet pairing in the positive- U Hubbard model

Journal Article · Mon Jul 15 04:00:00 EDT 1991 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.67.370· OSTI ID:5535841

Scalettar, R T; Singh, R R.P. ^[1]; Zhang, S ^[2]

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1. Department of Physics, University of California, Davis, California 95616 (USA)
2. IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120 (USA)

We consider the possibility of an odd-parity singlet pairing in the positive-{ital U} Hubbard model, which naturally incorporates short-ranged antiferromagnetic correlations in the ground state. In a quantum Monte Carlo simulation of a nearly half-filled Hubbard model, we find that the repulsive {ital U} enhances the tendency for this type of pairing more strongly than for other pairing channels considered earlier. We propose a BCS-type wave function for this pairing where the gap has no nodes over the Fermi surface, and discuss various experimental consequences in connection to high-{ital T}{sub {ital c}} superconductivity.

• OSTI ID: 5535841
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 67:3; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

656100* -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETISM
BAND THEORY
ENERGY GAP
ENERGY LEVELS
FERMI LEVEL
HIGH-TC SUPERCONDUCTORS
INTERACTIONS
MAGNETISM
MONTE CARLO METHOD
PAIRING INTERACTIONS
PARITY
PARTICLE PROPERTIES
SUPERCONDUCTORS