Local Pairing at U-impurities in BCS Superconductors
Ivar Martin, Philip Phillips (University of Illinois at, Urbana-Champaign)
TL;DR
This paper investigates how electrons on Anderson-U impurities influence superconductivity, revealing that phonon coupling and Kondo resonance can counteract impurity-induced T_c suppression, sometimes even enhancing superconductivity.
Contribution
It introduces a detailed analysis of impurity effects on superconductivity, highlighting the role of phonon coupling and Kondo resonance in modifying T_c.
Findings
Impurities can enhance T_c under certain conditions.
Phonon coupling at impurities counteracts T_c suppression.
Kondo resonance increases density of states, aiding superconductivity.
Abstract
We analyse here the role electrons on Anderson-U impurities play in superconductivity in a metal alloy. We find that phonon coupling at impurities counteracts the traditional effects which dominate T_c suppression in the non-magnetic limit. In some cases, we findt hat non-magnetic impurities can enhance T_c. In the Kondo limit, a Fermi liquid analysis reveals that it is the enhancement in the density of states arising from the Kondo resonancethat counteracts pair-weakening.
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