Effect of anisotropic impurity scattering in superconductors

Grzegorz Harań; A. D. S. Nagi

doi:10.1103/PhysRevB.58.12441

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Effect of anisotropic impurity scattering in superconductors

Grzegorz Harań, A. D. S. Nagi

DOI 10.1103/PhysRevB.58.12441 · Physical Review B

T1

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Abstract

We discuss the weak-coupling BCS theory of a superconductor with 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 Tc is studied in the Born and unitary limit for a dx2−y2- and (dx2−y2+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 Tc. A good agreement with the experimental data for Zn doping and oxygen irradiation in the overdoped cuprates is found.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown