Heavy-fermion system: Superconducting and magnetic fluctuations within a periodic-cluster Hubbard model
An exact solution of an eight-site crystal model with periodic boundary conditions, a small face-centered-cubic crystal, is presented for the case of a heavy-fermion system. The model consists of (a) single, fully symmetric orbital per site, with nearest-neighbor and second-nearest-neighbor hopping; (b) an infinite Coulomb repulsion between electrons on the same site; (c) antiferromagnetic superexchange interactions; and (d) band fillings near half filling (six, seven, and eight electrons per cluster). The superconducting and the antiferromagnetic correlations are studied and compared with the predictions of the noninteracting limit. The suitability of Bardeen-Cooper-Schrieffer and Gutzwiller approximate ground-state wave functions are quantitatively estimated.
- Research Organization:
- Physics Department and Materials and Chemical Sciences Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720 Copenhagen OX, Denmark
- OSTI ID:
- 6587208
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 38:16; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACTINIDES
ANTIFERROMAGNETISM
BCS THEORY
COULOMB FIELD
CRYSTAL LATTICES
CRYSTAL MODELS
CRYSTAL STRUCTURE
CUBIC LATTICES
ELECTRIC CONDUCTIVITY
ELECTRIC FIELDS
ELECTRICAL PROPERTIES
ELEMENTS
FCC LATTICES
FLUCTUATIONS
FUNCTIONS
HAMILTONIAN FUNCTION
HEISENBERG MODEL
MAGNETIC PROPERTIES
MAGNETISM
MATHEMATICAL MODELS
METALS
PHYSICAL PROPERTIES
RARE EARTHS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
VARIATIONS
WAVE FUNCTIONS