Superconducting pairing of the extended multiband Hubbard model: A weak-coupling study

Journal Article · Mon Jan 01 04:00:00 EST 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.41.853· OSTI ID:6988886

Putz, R; Ehlers, B; Lilly, L; Muramatsu, A; Hanke, W ^[1]

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1. Physikalisches Institut, Universitaet Wuerzburg, D-8700 Wuerzburg, Federal Republic of Germany (DE)

Pairing mediated by charge and spin fluctuations is examined within the weak-coupling approximation for a three-band Hubbard model for the cuparate superconductors with both intrasite ({ital U}{sub {ital d}},{ital U}{sub {ital p}}) and intersite repulsion ({ital U}{sub {ital pd}}). Like in the one-band situation, paramagnon exchange near a spin-density-wave instability gives rise to a singlet {ital d}-wave pairing interaction. On the other hand, the exchange of charge-fluctuation modes due to {ital U}{sub {ital pd}} leads to {ital s}-wave coupling near an interband instability and to {ital d}-wave coupling near the intraband charge-density-wave instability. When simultaneously on-site interactions are included the {ital s}-wave pairing is shifted to large dopings away from half-filling and again replaced by {ital d}-wave coupling for smaller dopings.

• OSTI ID: 6988886
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 41:1; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

656100* -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ENERGY LEVELS
FERMI LEVEL
FLUCTUATIONS
HARTREE-FOCK METHOD
INTERACTIONS
OXIDES
OXYGEN COMPOUNDS
PAIRING INTERACTIONS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
VARIATIONS