Abstract
The magnetic properties of the superconducting Chevrel compound Eu0.75Sn0.25Mo6S7.6Se0.4 have been studied by μ+SR. The measurements covered the field range 0–30 kOe at various temperatures between 0.05 K and 1.5 K as well as studied in fields between 0 and 3 kOe from 2 K up to room temperature. Strong effects due to the Eu 4f-moments are observed over the whole temperature range. The relaxation rate seems to have its origin mainly in the dynamics of the Eu spins. For comparison the nonmagnetic Chevrel phase superconductor SnMo6S4Se4 was measured too.
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