Abstract
We report neutron-diffraction results on UCuSn which crystallizes in the orthorhombic P21cn structure. This compound undergoes two magnetic transitions around TN=62K and TM=25K. At T=52K, UCuSn exhibits a noncollinear arrangement of uranium moments of ∼1.5μB∕U-atom with components in all three principal directions. Our diffraction data provide further evidence that the transition around 25K is indeed magnetic in origin, although our refinements did not lead to a conclusive answer on its exact nature.
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