CPA Theory of Superconducting Alloys with Diagonal and Off-Diagonal Disorder |
| M. Michalik and K.I. Wysokiński
Institute of Physics, M. Curie-Skłodowska University, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland |
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| The general theory of disorder in superconducting alloys was discussed. We use standard Wannier function representation and allow for diagonal and off-diagonal disorder. We generalized the coherent potential approximation in the version able to deal with off-diagonal disorder in normal systems to treat superconducting state. As an illustration we calculate the quasiparticle density of states and gap function of a d-wave superconductor. We show inter alia that the rate at which superconductivity disappears depends on the kind of disorder and for off-diagonal disorder it depends on the details of its realization. |
| DOI: 10.12693/APhysPolA.106.653 PACS numbers: 71.10.-w, 71.23.-k, 74.20.-z |