Charge fluctuations: Spin fluctuations and superconductivity in a CuO sub 2 sheet

Journal Article · Sat Sep 01 00:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.42.4105· OSTI ID:6359652

Sudbo, A; Houghton, A ^[1]

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1. Department of Physics, Brown University, Providence, RI (USA)

A {ital U}{sub {ital d}}={infinity} Anderson lattice model with a tight-binding band structure is used to model the CuO{sub 2} sheets of the high-{Tc} oxides. The model is treated within a strong-coupling slave-boson method treating spin and charge fluctuations on equal footing. At the mean-field level the normal state is a Fermi liquid at finite doping with a transition to a charge-transfer insulator at half-filling for a large enough charge-transfer gap. Charge fluctuations give rise to a repulsive quasiparticle interaction, but spin fluctuations give rise to an antiferromagnetic exchange interaction and it is shown that this leads to strong-coupling {ital s}-wave pairing for physically reasonable values of the charge-transfer gap.

• OSTI ID: 6359652
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 42:7; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
HIGH-TC SUPERCONDUCTORS
BAND THEORY
COPPER OXIDES
ELECTRONIC STRUCTURE
FERMI LEVEL
FLUCTUATIONS
SPIN
ANGULAR MOMENTUM
CHALCOGENIDES
COPPER COMPOUNDS
ENERGY LEVELS
OXIDES
OXYGEN COMPOUNDS
PARTICLE PROPERTIES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
VARIATIONS
656100* - Condensed Matter Physics- Superconductivity