Self-consistent weak-coupling study of the three-band CuO[sub 2] model

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

DOI:https://doi.org/10.1103/PhysRevB.47.12153· OSTI ID:6608728

Luo, J; Bickers, N E ^[1]

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1. Department of Physics, University of Southern California, Los Angeles, California 90089 (United States)

The fluctuation-exchange'' approximation, a Baym-Kadanoff theory used previously to treat the one-band Hubbard model, is used to investigate a three-band model for the CuO[sub 2] planes in the cuprate superconductors. Attention is restricted to (a) nearest-neighbor copper-oxygen hopping and (b) a Hubbard-like Coulomb interaction on copper sites only. Orbital-occupancy factors are shown to be in good agreement with previous quantum simulation studies. An instability eigenvalue analysis confirms that, as in the one-band model, the most likely channel for superconductivity is a [ital d][sub [ital x]][sup 2][minus][ital y][sup 2] singlet. The scale for onset of exponentially long-ranged antiferromagnetic correlations is compared with results for the one-band model, and the role of hybridization in reducing the effective Coulomb interaction is studied using a transformation to Wannier states.

• OSTI ID: 6608728
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 47:18; 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
ANTIFERROMAGNETISM
BAND THEORY
CRYSTAL MODELS
D STATES
ENERGY LEVELS
HIGH-TC SUPERCONDUCTORS
HUBBARD MODEL
HYBRIDIZATION
INTERACTIONS
MAGNETISM
MATHEMATICAL MODELS
NUCLEAR MODELS
PAIRING INTERACTIONS
SELF-CONSISTENT FIELD
SUPERCONDUCTORS
WEAK-COUPLING MODEL