Spatial fluctuations of the pairing potential in disordered superconductors
Abstract
We study the effect of site diagonal, non-magnetic, disorder on the a pairing amplitude in an extended Hubbard model with the intersite attraction. Analyzing fluctuations of a pairing potential we discuss the instability of mixed solutions, 's+d' and 's+id', in presence of disorder. The influence of disorder on extended s- and d-wave superconductors appear to be comparable but in certain regions of the phase diagram, even weak disorder can change the symmetry of the order parameter.
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