Abstract
It has been predicted that the virtual bound states localized at Mn atoms in bulk samples of Al-Mn alloys in the normal state will yield an observable band of bound states below the gap edge of the alloy when it is cooled and becomes superconducting. We present reasons why we believe that such bound states would be too broad to be seen in such samples but might be present in quench-condensed films. We have used electron-tunneling measurements to look for these bound states in superconducting, quench-condensed, Al-Mn alloy films, but have not found them. We believe our results indicate that the manganese atoms are nonmagnetic and that any bound states that exist must be too broad to be seen in this tunneling experiment.
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