Validity of the [ital t]-[ital J] model

Journal Article · Sun Aug 01 04:00:00 EDT 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.48.4212· OSTI ID:6171894

Batista, C D; Aligia, A A ^[1]

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1. Comision Nacional de Energia Atomica, Centro Atomico Bariloche, 8400 Bariloche (Argentina)

We have diagonalized exactly an effective Hamiltonian [ital H][sub eff] that describes the low-energy eigenstates of Cu[sub 4]O[sub 8] cluster with five holes. Projecting these eigenstates onto Zhang-Rice states we find that for total spin [ital S]=1/2, they have more than 90% of local singlet character for realistic parameters. This percentage depends on [ital S] and the symmetry of the states and is larger for the ground state. The fit of the energy levels using a model similar to the [ital t]-[ital J] model, is improved substantially if the model includes a term that combines a nearest-neighbor exchange with a next-nearest-neighbor hopping.

• OSTI ID: 6171894
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 48:6; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

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665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANGULAR MOMENTUM
ATOMIC CLUSTERS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL MODELS
EIGENSTATES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY LEVELS
HAMILTONIANS
MATHEMATICAL MODELS
MATHEMATICAL OPERATORS
OXIDES
OXYGEN COMPOUNDS
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
QUANTUM OPERATORS
SPIN
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS