Pairbreaking Without Magnetic Impurities in Disordered Superconductors
Amit K. Chattopadhyay, Richard A. Klemm, Debanand Sa
Abstract
We study analytically the effects of inhomogeneous pairing interactions in short coherence length superconductors, using a spatially varying Bogoliubov-deGennes model. Within the Born approximation, it reproduces all of the standard Abrikosov-Gor'kov pairbreaking and gaplessness effects, even in the absence of actual magnetic impurities. For pairing disorder on a single site, the T-matrix gives rise to bound states within the BCS gap. Our results are compared with recent scanning tunneling microscopy measurements on Bi2Sr2CaCu2O8+δ with Zn or Ni impurities.
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