Fluctuation exchange analysis of superconductivity in the standard three-band CuO2 model

Article

关键词: HIGH-TC SUPERCONDUCTIVITY;    2-DIMENSIONAL HUBBARD-MODEL;    SELF-CONSISTENT-FIELD;    CONSERVING APPROXIMATIONS;    ELECTRON-SYSTEMS;    OXIDES;    LA2CUO4;   

DOI  :  10.1103/PhysRevB.57.5376

来源: SCIE

【 摘 要 】

The fluctuation exchange, or FLEX, approximation for interacting electrons is applied to study instabilities in the standard three-band model for CuO2 layers in the high-temperature superconductors. Both intraorbital and near-neighbor Coulomb interactions are retained. The filling dependence of the d(x2-y2) transition temperature is studied in both the hole-doped and electron-doped regimes using parameters derived from constrained-occupancy density-functional theory for La2CuO4. The agreement with experiment on the overdoped hole side of the phase diagram is remarkably good, i.e., transitions emerge in the 40 K range with no free parameters. In addition the importance of the orbital antiferromagnetic, or flux phase, charge density channel is emphasized for an understanding of the underdoped regime.

【 授权许可】

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