We analyze here the role electrons on Anderson (Formula presented) impurities play in superconductivity in a metal alloy. We find that phonon coupling at impurities counteracts the traditional effects which dominate (Formula presented) suppression in the nonmagnetic limit. In some cases, we find that nonmagnetic impurities can enhance (Formula presented) Qualitative agreement is found between the predicted increase and the experimental data for IV-VI degenerate semiconductors doped with Tl or In. In the Kondo limit, a Fermi-liquid analysis reveals that it is the enhancement in the density of states arising from the Kondo resonance that counteracts pair weakening.
|Original language||English (US)|
|Number of pages||5|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - 1997|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics