Kondo screening in unconventional superconductors: The role of anomalous propagators
Lars Fritz, Matthias Vojta
DOI 10.1103/PhysRevB.72.212510 · Physical Review B
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Abstract
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 pointlike impurities in d-wave superconductors. We comment on recent investigations [M. Matsumoto and M. Koga, J. Phys. Soc. Jpn. 70, 2860 (2001); Phys. Rev. B 65, 024508 (2002)] 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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