Coherent potential approximation for d-wave superconductivity in disordered systems

Article

关键词: DENSITY-OF-STATES;    HIGH-TEMPERATURE SUPERCONDUCTORS;    PENETRATION DEPTH;    NONMAGNETIC IMPURITIES;    ORDER-PARAMETER;    ZN SUBSTITUTION;    PAIRING STATE;    2 DIMENSIONS;    SCATTERING;    NI;   

DOI  :  10.1103/PhysRevB.60.7523

来源: SCIE

【 摘 要 】

A coherent-potential approximation CPA is developed for s-wave and d-wave superconductivity in disordered systems. We show that the CPA formalism reproduces the standard pair breaking formula, the self-consistent Born approximation and the self-consistent T-matrix approximation in the appropriate limits. We implement the theory and compute T-c for s-wave and d-wave pairing using an attractive nearest-neighbor Hubbard model featuring both binary-alloy disorder and a uniform distribution of scattering site potentials. We determine the density of states and examine its consequences for low-temperature heat capacity. [S0163-1829(99)02034-2].

【 授权许可】

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