Pseudogap and unconventional pairing in the Hubbard model

Conference · Sun Dec 20 04:00:00 EST 1998 · International Journal of Modern Physics B

OSTI ID:6324737

Malozovsky, Y M; Fan, J D ^[1]

---

1. Southern Univ. and A and M College, Baton Rouge, LA (United States). Dept. of Physics

The attractive (U < 0) and repulsive (U > 0) Hubbard models have been studied using the Fermi liquid perturbation approach. The attractive Hubbard model (U < 0) is an adequate model for [sup 3]He, an incompressible and strongly paramagnetic liquid with a pseudogap in the charge response. A pairing instability and superfluidity for U < 0 exists in the spin channel only; spin-triplet with l = 0, or spin-singlet with l = 1 (p-wave orbital state j = s + l = 1), where l is the orbital momentum of a pair. The repulsive Hubbard model (U > 0) represents a highly compressible and nearly antiferromagnetic liquid with a pseudogap in the spin response. However, for U > 0 a pairing instability and superconductivity exist in the charge channel only: spin-singlet with l = 0 (s-wave), or with l = 2 (d-wave) in the case of an anisotropic Fermi surface.

• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-94ER25229
• OSTI ID: 6324737
• Report Number(s): CONF-980291--
• Conference Information: Journal Name: International Journal of Modern Physics B Journal Volume: 12:29-31
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204 -- Ceramics
Cermets
&amp; Refractories-- Physical Properties
665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COULOMB FIELD
CRYSTAL MODELS
ELECTRIC CONDUCTIVITY
ELECTRIC FIELDS
ELECTRICAL PROPERTIES
ENERGY GAP
HIGH-TC SUPERCONDUCTORS
HUBBARD MODEL
INTERACTIONS
MATHEMATICAL MODELS
PAIRING INTERACTIONS
PERTURBATION THEORY
PHYSICAL PROPERTIES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TYPE-II SUPERCONDUCTORS