Pairbreaking Without Magnetic Impurities in Disordered Superconductors

Details Pairbreaking Without Magnetic Impurities in Disordered Superconductors Pairbreaking Without Magnetic Impurities in Disordered Superconductors

2002-03-06

arxiv.org/abs/cond-mat/0203124v2

J. Phys.: Condens. Matter 14 (2002) L577-L582

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures, submitted to PRL

Scientific paper

10.1088/0953-8984/14/31/101

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$_{8+\delta}$ with Zn or Ni impurities.

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