Kondo screening in unconventional superconductors: The role of anomalous propagators

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 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.

arXiv comment3 pages, 2 figs, (v2) final version as published

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Cited by in corpus (13)

• The numerical renormalization group method for quantum impurity systems
• The Physics of Kondo Impurities in Graphene
• Numerical renormalization group calculation of near-gap peaks in spectral functions of the Anderson model with superconducting leads
• Kondo effect on the surface of 3D topological insulators: Signatures in scanning tunneling spectroscopy
• Efficient simulation of open quantum systems coupled to a fermionic bath
• Local moment formation and Kondo screening in impurity trimers
• Single Impurity Effects in Multiband Superconductors with Different Sign Order Parameters
• Anomaly in the heat capacity of Kondo superconductors
• Quantum impurities in channel mixing baths
• Spectral Density Modulation and Universal Markovian Closure of Fermionic Environments
• Impurity Quantum Phase Transition in a Current-Carrying d-Wave Superconductor
• Subtleties in the pseudomodes formalism
• Kondo Compensation in a Pseudogap Phase: a Renormalization Group Study