Role of anisotropic impurity scattering in anisotropic superconductors
Grzegorz Harań, A. D. S. Nagi
DOI 10.1103/PhysRevB.54.15463 · Physical Review B
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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-à-vis impurity concentration. The implications of our result for YBCO high-temperature superconductor are discussed. The experimental data of electron irradiation-induced Tc suppression [Phys. Rev. B 50, 15 967 (1994)] are understood quantitatively and a good qualitative agreement with the ion (Ne+) damage and Pr substitution-induced Tc decrease data [Phys. Rev. B 50, 3266 (1994)] is obtained.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBCO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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