Local Pairing at U-impurities in BCS Superconductors
Ivar Martin, Philip Phillips
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 Tc suppression in the non-magnetic limit. In some cases, we findt hat non-magnetic impurities can enhance Tc. 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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