Abstract
We find that Fe is magnetic when introduced as an impurity in the A-15 super-conductor Nb 76 Pt 24 . The ternary diagram of the system Nb-Pt-Fe is presented. The Fe impurities show a magnetic behavior when they are on the linear chains (Nb sites) and a nonmagnetic behavior when they are on the cubic sites (Pt sites). Supposing that the Fe atoms have a pair-breaking effect as well as a nonmagnetic effect on the superconducting state and determining the latter by adding nonmagnetic impurities (Ru), we are able to fit the measured critical field as a function of temperature to the WHH theory generalized to include magnetic impurities. The analysis shows that the exchange interactionJ between conduction electrons and the Fe atoms is negative. A Jaccarino-Peter compensation effect takes place at about 2 at % Fe. The inverse Fe susceptibility curves are fitted using a model of short-range interactions between impurities.
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Bongi, G., Flükiger, R., Treyvaud, A. et al. The behavior of magnetic and nonmagnetic impurities in the system Nb76Pt24−x Fe x . J Low Temp Phys 17, 223–246 (1974). https://doi.org/10.1007/BF00659071
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DOI: https://doi.org/10.1007/BF00659071