Off-Diagonal Nonmagnetic Disorder in s- and d-Wave Superconductors
نویسنده
چکیده
The previously developed approach to study off-diagonal disorder has been extended and applied to both sand 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.
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