UCuSn was thought to crystallize in the CaIn
2-type structure. It orders antiferromagnetically at T=60K and exhibits a moderately enhanced linear heat capacity coefficient (53mJ/molK
2). A second anomaly visible in all bulk properties around 30K was interpreted in terms of a drastic change in the Fermi surface with no
magnetic phase transition. Further work reported that
UCuSn crystallizes in a
structure closely related to the hexagonal GaGeLi structure namely the orthorhombic P2
1cn. Soon after that, Szytula et al. claimed that the structure should be P6
3mc while P2
1cn should be disregarded. Nevertheless, they indicated not being able to fit all peaks assuming the hexagonal symmetry. This paper reports neutron-diffraction results on UCuSn indicating that the compound undergoes two magnetic transitions around T
N=62K and T
M=25K. At T=52K, UCuSn exhibits a noncollinear arrangement of uranium moments of 1.5 Bohr-magneton/U-atom with components in all three principal direction and crystallizing in P2
1cn structure.
More reviews about the Magnetic Structures in Ucusn