Exchange-driven pairing of delocalized carriers in high-temperature superconductors

Journal Article · Sun Oct 01 04:00:00 EDT 1989 · Physical Review (Section) B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.40.6919· OSTI ID:5397792

Stechel, E B; Jennison, D R ^[1]

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1. Solid State Theory Division 1151, Sandia National Laboratories, Albuquerque, New Mexico 87185 (US)

A semiquantitative pairing model is derived from the properties of a realistic Hamiltonian for CuO{sub 2} sheets. Due to large interactions between oxygen ions, to first-order {ital delocalized} carriers pair via localized spin-system holes on the Cu sublattice. The largest carrier-Cu couplings are dynamic exchange processes involving the Cu({ital d}{sup 10}) and Cu({ital d}{sup 8}) configurations. Up to carrier concentrations of {similar to}30--40 %, exchange-mediated attraction overcomes the large carrier Coulomb repulsion, present because of dielectric local screening. The same mechanism is shown to be capable of explaining high-temperature superconductivity in BiO{sub 3}. The pairing interaction is attractive for triplet and repulsive for singlet {ital s}-wave pairs.

• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5397792
• Journal Information: Physical Review (Section) B: Condensed Matter; (USA), Journal Name: Physical Review (Section) B: Condensed Matter; (USA) Vol. 40:10; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

656100* -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BAND THEORY
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
HAMILTONIANS
INTERACTIONS
MATHEMATICAL OPERATORS
OXIDES
OXYGEN COMPOUNDS
PAIRING INTERACTIONS
PHYSICAL PROPERTIES
QUANTUM OPERATORS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS