Effect of anisotropic impurity scattering in superconductors

Details Effect of anisotropic impurity scattering in superconductors Effect of anisotropic impurity scattering in superconductors

1999-04-19

arxiv.org/abs/cond-mat/9904263v1

Phys. Rev. B 58 (1998) 12441-12453

Physics

Condensed Matter

Superconductivity

31 pages, RevTex, 15 PostScript figures

Scientific paper

10.1103/PhysRevB.58.12441

We discuss the weak-coupling BCS theory of a superconductor with the impurities, accounting for their anisotropic momentum-dependent potential. The impurity scattering process is considered in the t-matrix approximation and its influence on the superconducting critical temperature is studied in the Born and unitary limit for a d- and (d+s)-wave superconductors. We observe a significant dependence of the pair-breaking strength on the symmetry of the scattering potential and classify the impurity potentials according to their ability to alter T_c. A good agreement with the experimental data for Zn doping and oxygen irradiation in the overdoped cuprates is found.

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