Extended Emery models with antiferromagnetic and superconducting pairings

The mean-field (MF) study of electronic pairing in the CuO2 plane of high-temperature superconductors (HTSC) in the band approach is extended to Emery-like models including psigma -psigma hopping in addition to psigma -d hopping and a detailed picture of local interactions. Various types of correlated hopping interactions (CHI) are tested as factors that might induce superconductivity (SC). A classification of the order parameters (OP) for all types of pairing is presented for the upper band of such an extended three-band Emery model. Self-consistent equations for all OP are derived. The MF calculations of phase diagrams show that s-type SC may be induced by p-d or p-p CHI, but such systems (in the MF approach) do not exhibit antiferromagnetism (AF) in the undoped case. In contrast, models with large p-d CHI governed by p occupancy may exhibit both d-type SC and AF at small doping, and there is a range of doping where d-type AF and d-type SC may coexist.

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