Magnetic and superconducting properties of the system Mo77Ir23-xFex

The authors find that Fe is magnetic when introduced as an impurity in the A15 superconductor Mo77Ir23. The susceptibility of the Fe impurity follows a Curie-Weiss law, which can be understood in terms of short range interactions. The superconducting properties can be explained in terms of standard pairbreaking theories including a negative exchange field and the effects of the short range ordering. From this influence of the magnetic impurities on the superconducting properties the Maki parameter alpha and the spin-orbit parameter lambda s0 have been determined for the pure sample.

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