Abstract
The effect of Fe impurities on the superconductivity of Tc has been investigated with almost dirty-limit samples prepared by electrodeposition and reduction. Upper-critical-field curves show, as expected from the Moessbauer study, the existence of an exchange field due to the impurity. The observed transition-temperature depression by Fe impurities indicates that there is localized spin fluctuation in the Tc-Fe alloy. This conclusion is not consistent with the previous results found for arc-melted Tc-Fe alloys.
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