SU(2) superconductivity in the negative-[ital U] Hubbard model

Journal Article · Mon Nov 01 04:00:00 EST 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.48.12917· OSTI ID:5920963

Soni, V; Thakur, J S ^[1]

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1. National Physical Laboratory, Theory Group, Dr. K. S. Krishnan Road, New Delhi 110012 (India)

We exhibit an additional SU(2) symmetry of the Hubbard model at half-filling, which suggests a simple physical manifestation of this symmetry in the presence of an applied magnetic field. The system governed by a negative-[ital U] Hubbard Hamiltonian will lose its superconductivity at an applied magnetic field well below the critical [ital H][sub [ital c]] associated with a conventional superconductor. Though departure from half-filling and the inclusion of a repulsive nearest-neighbor interaction break this symmetry, the above physical effect should still persist strongly and is indicative of a new type of SU(2) superconductor for the negative-[ital U] or attractive on-site Hubbard model.

• OSTI ID: 5920963
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 48:17; 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
CHARGE DENSITY
CRYSTAL MODELS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY LEVELS
GROUND STATES
HUBBARD MODEL
LIE GROUPS
MAGNETIC FIELDS
MATHEMATICAL MODELS
MEAN-FIELD THEORY
PHYSICAL PROPERTIES
SU GROUPS
SUPERCONDUCTIVITY
SYMMETRY
SYMMETRY GROUPS