Pairing fluctuation theory of high-T-c superconductivity in the presence of nonmagnetic impurities

Article

关键词: D-WAVE SUPERCONDUCTOR;    DENSITY-OF-STATES;    TEMPERATURE PENETRATION DEPTH;    EINSTEIN CROSSOVER SCENARIO;    PHASE FLUCTUATIONS;    SUPERFLUID DENSITY;    ZN SUBSTITUTION;    QUASI-PARTICLES;    PSEUDOGAP STATE;    SCATTERING;   

DOI  :  10.1103/PhysRevB.66.014512

来源: SCIE

【 摘 要 】

The pseudogap phenomena in the cuprate superconductors requires a theory beyond the mean-field BCS level. A natural candidate is to include strong pairing fluctuations, and treat the two-particle and single-particle Green's functions self-consistently.At the same time, impurities are present in even the cleanest samples of the cuprates. Some impurity effects can help reveal whether the pseudogap has a superconducting origin and thus test various theories. Here we extend the pairing fluctuation theory for a clean system [Chen , Phys. Rev. Lett. 81, 4708 (1998)] to the case with nonmagnetic impurities. Both the pairing and the impurity T matrices are included and treated self-consistently. We obtain a set of three equations for the chemical potential mu, T-c, the excitation gap Delta(T-c) at T-c, or mu, the order parameter Delta(sc), and the pseudogap Delta(pg) at temperature T

【 授权许可】

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