Observation of nonmagnetic resonant scattering effects by tunneling in dilute Al-mn alloy superconductors

We have observed the BCS-like density of states predicted for energy-gap suppression by nonmagnetic Anderson impurities in superconductors. We show that Mn impurities in Al exhibit no magnetic character and act exclusively as strong resonant scattering sites without producing time-reverse symmetry b...

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Bibliographic Details
Published inPhysical review letters Vol. 100; no. 5; p. 056804
Main Authors O'Neil, G, Schmidt, D, Miller, N A, Ullom, J N, Williams, A, Arnold, G B, Ruggiero, S T
Format Journal Article
LanguageEnglish
Published United States 08.02.2008
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Summary:We have observed the BCS-like density of states predicted for energy-gap suppression by nonmagnetic Anderson impurities in superconductors. We show that Mn impurities in Al exhibit no magnetic character and act exclusively as strong resonant scattering sites without producing time-reverse symmetry breaking of Cooper pairs (pair breaking).
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.100.056804