ANTIFERROMAGNETIC ORDERING IN PRCUSN AND NDCUSN

The magnetic properties of polycrystalline samples of PrCuSn and NdCuS n, including their magnetic structures, were determined by magnetic an d neutron diffraction measurements. Both compounds show the hexagonal, CaIn2-type crystal structure and are antiferromagnetic at low tempera tures. Below T-N = 3 K, the sine modulated magnetic structure with the wave vector k = (0.349, 0, 0) is observed in PrCuSn, while in NdCuSn below T-N = 9 K the collinear antiferromagnetic ordering described by the wave vector k = (1/2, 0, 0) was detected. In both phases the magne tic moments are parallel to the hexagonal c-axis.