Role of anisotropic impurity scattering in anisotropic superconductors

Details Role of anisotropic impurity scattering in anisotropic superconductors Role of anisotropic impurity scattering in anisotropic superconductors

1996-09-21

arxiv.org/abs/cond-mat/9609217v1

Physics

Condensed Matter

14 pages, RevTeX, 5 PostScript figures, to be published in Phys. Rev. B (December 1, 1996)

Scientific paper

10.1103/PhysRevB.54.15463

A theory of nonmagnetic impurities in an anisotropic superconductor including the effect of anisotropic (momentum-dependent) impurity scattering is given. It is shown that for a strongly anisotropic scattering the reduction of the pair-breaking effect of the impurities is large. For a significant overlap between the anisotropy functions of the scattering potential and that of the pair potential and for a large amount of anisotropic scattering rate in impurity potential the superconductivity becomes robust vis a vis impurity concentration. The implications of our result for YBCO high-temperature superconductor are discussed.

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