d(x2-y2) superconductivity in a generalized Hubbard model

Article

关键词: T-J MODEL;    COHERENCE LENGTH SUPERCONDUCTORS;    NORMAL-STATE;    CUPRATE SUPERCONDUCTORS;    PAIRING CORRELATIONS;    C SUPERCONDUCTORS;    FERMI-LIQUID;    SPIN GAP;    FLUCTUATIONS;    BI2SR2CACU2O8+DELTA;   

DOI  :  10.1103/PhysRevB.59.1333

来源: SCIE

【 摘 要 】

We consider an extended Hubbard model with nearest-neighbor correlated hopping and next-nearest-neighbor hopping t' obtained as an effective model for cuprate superconductors. Using a generalized Hartree-Fock BCS approximation, we find that for high enough t' and doping, antiferromagnetism is destroyed and the system exhibits d-wave superconductivity. Near optimal doping we consider the effect of antiferromagnetic spin fluctuations on the normal self-energy using a phenomenological susceptibility. The resulting superconducting critical temperature as a function of doping is in good agreement with experiment. [S0163-1829(99)06101-9].

【 授权许可】

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