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Pairbreaking Without Magnetic Impurities in Disordered Superconductors

Amit K. Chattopadhyay·Richard A. Klemm·Debanand Sa
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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 Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ with Zn or Ni impurities.

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Amit K. Chattopadhyay, Richard A. Klemm, Debanand Sa. 2002-03-30. Pairbreaking Without Magnetic Impurities in Disordered Superconductors. https://doi.org/10.1088/0953-8984%2F14%2F31%2F101

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