Local Pairing at U-impurities in BCS Superconductors
Strongly Correlated Electrons
2009-10-30 v2 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.
Cite
@article{arxiv.cond-mat/9704207,
title = {Local Pairing at U-impurities in BCS Superconductors},
author = {Ivar Martin and Philip Phillips},
journal= {arXiv preprint arXiv:cond-mat/9704207},
year = {2009}
}
Comments
4 pages, LaTeX, 2 figures