Off-Diagonal Nonmagnetic Disorder in s- and d-Wave Superconductors
M. Michalik and K.I. Wysokiński
Institute of Physics, M. Curie-Skłodowska University, Radziszewskiego 10, 20-031 Lublin, Poland
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Received: 25 09 2005;
The previously developed approach to study off-diagonal disorder has been extended and applied to both s- and d-wave superconductors. The derived equations allow the self-consistent solution of the problem. For a special case of negative U centres embedded in non-superconducting host we have calculated their critical concentration for the appearance of superconductivity and found it equal to≈0.4. For x>xcr the order parameter continuously increases to its maximal value at x=1.
DOI: 10.12693/APhysPolA.109.623
PACS numbers: 71.10.-w, 71.23.-k, 74.20.-z