Abstract
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. The experimental data of electron irradiation-induced ${T}_{c}$ suppression [Phys. Rev. B 50, 15 967 (1994)] are understood quantitatively and a good qualitative agreement with the ion (${\mathrm{Ne}}^{+}$) damage and Pr substitution-induced ${T}_{c}$ decrease data [Phys. Rev. B 50, 3266 (1994)] is obtained.
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