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- W2042017004 abstract "As a model for high-${mathit{T}}_{mathit{c}}$ superconductors, a two-band Hubbard model is proposed. When the Coulomb interactions are introduced between the ensuremath{alpha} and ensuremath{beta} orbitals, an effective attraction of carriers in the ensuremath{beta} (doped) band is shown to arise in an appropriate condition. The quantum Monte Carlo method is used to confirm the occurrence of Cooper pairing in finite two-band Hubbard systems. The attraction, which also appears in the density-density correlation, enhances the on-site singlet Cooper pair-pair correlation in the ensuremath{beta} band and suppresses the antiferromagnetic spin-spin correlation in the ensuremath{alpha} band. The criterion for the pairing and the nature of the pairing are discussed. Thus we provide a mechanism of superconductivity specific to strongly correlated two-band systems." @default.
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- W2042017004 creator A5005161958 @default.
- W2042017004 date "1990-08-01" @default.
- W2042017004 modified "2023-09-30" @default.
- W2042017004 title "Superconductivity in a two-band Hubbard model" @default.
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- W2042017004 doi "https://doi.org/10.1103/physrevb.42.2125" @default.
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