Calculation of angle-resolved photoemission and tunneling for a CuO[sub 2] layer in the normal and superconducting states
- Department of Applied Physics, Stanford University, Stanford, California 94305 (United States)
We represent the normal-state electronic structure of a CuO[sub 2] layer in terms of a three-band model having an infinite Cu intrasite Coulomb repulsion. We express the Lagrangian for this model using a slave-boson formalism and approximate it in a large-[ital N] expansion to order 1/[ital N] in the zero-temperature limit. The angle-resolved spectral weight determined from the resulting Green's functions suggests that within this picture higher-order corrections in 1/[ital N] are necessary for good agreement with the corresponding angle-resolved photoemission data. We phenomenologically add spin-dependent Heisenberg interactions between neighboring Cu sites and neighboring Cu and O sites. These interactions form the basis of a nonretarded calculation of the superconducting state. For the case of an interaction between neighboring Cu spins only, the lowest-energy solution possesses [ital d]([ital x][sup 2][minus][ital y][sup 2]) symmetry. The use of a three-band model leads to the possibility of the addition of the interaction between Cu and O spins. The resulting [ital d]+[ital idp] superconducting state involves pairing of carriers in Cu orbitals both with themselves and with holes on the O orbitals. This additional pairing will remove the node in the [ital d]-wave state at [ital T]=0 by an amount that depends on the Cu-O coupling parameter; however, the mixed-symmetry state occurs only for a narrow range of coupling parameters. The angle-resolved photoemission and tunneling results are calculated and compared to experimental findings.
- OSTI ID:
- 6642019
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Vol. 47:17; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COPPER OXIDES
ELECTRONIC STRUCTURE
HIGH-TC SUPERCONDUCTORS
GREEN FUNCTION
PAIRING INTERACTIONS
PHOTOEMISSION
TUNNEL EFFECT
CHALCOGENIDES
COPPER COMPOUNDS
EMISSION
FUNCTIONS
INTERACTIONS
OXIDES
OXYGEN COMPOUNDS
SECONDARY EMISSION
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
665411* - Basic Superconductivity Studies- (1992-)