Kondo screening in unconventional superconductors: The role of anomalous propagators

Details Kondo screening in unconventional superconductors: The role of anomalous propagators Kondo screening in unconventional superconductors: The role of anomalous propagators

2005-05-25

arxiv.org/abs/cond-mat/0505611v2

Phys. Rev. B 72, 212510 (2005)

Physics

Condensed Matter

Superconductivity

3 pages, 2 figs, (v2) final version as published

Scientific paper

10.1103/PhysRevB.72.212510

The Kondo effect in superconductors is frequently investigated using the local quasiparticle density of states as sole bath characteristics, i.e., the presence of anomalous propagators is ignored. Here we point out that this treatment is exact for a number of situations, including point-like impurities in d-wave superconductors. We comment on recent investigations [M. Matsumoto and M. Koga, J. Phys. Soc. Jpn. 70, 2860 (2001), cond-mat/0011256, and Phys. Rev. B 65, 024508 (2002), cond-mat/0103053] which reached different conclusions: while their numerical results are likely correct, their interpretation in terms of two-channel Kondo physics and an "orbital effect of Cooper pairs" is incorrect.

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