Local pairing at impurities in BCS superconductors can enhance

Ivar Martin, Philip Phillips

Research output: Contribution to journalArticlepeer-review


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 languageEnglish (US)
Pages (from-to)14650-14654
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number22
StatePublished - 1997

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


Dive into the research topics of 'Local pairing at impurities in BCS superconductors can enhance'. Together they form a unique fingerprint.

Cite this