s-Wave Order Parameter in the Presence of a Momentum-Dependent Impurity Scattering Potential |
| D. Rudzińska, P. Pisarski and G. Harań
Institute of Physics, Politechnika Wrocławska, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland |
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| Received: 6 11 2007; |
| Momentum dependence of the impurity potential leads to the anisotropy of a local density of states in isotropic s-wave superconductors. We complete this result by discussing the influence of a momentum-dependent impurity potential on the s-wave order parameter. The scattering process is considered in the T-matrix approximation, and the model impurity potential consists of two separate terms representing isotropic (on-site) and anisotropic (momentum-dependent) parts of the potential. We show that the effect of the isotropic part on the order parameter is local whereas the influence of the momentum-dependent term is nonlocal. |
| DOI: 10.12693/APhysPolA.114.149 PACS numbers: 74.62.Dh, 74.78.-w, 74.81.-g |