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 breaking of Cooper pairs (pair breaking).
O'Neil
G
G
National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.
Schmidt
D
D
Miller
N A
NA
Ullom
J N
JN
Williams
A
A
Arnold
G B
GB
Ruggiero
S T
ST