Magnetism in TbPdIn and DyPdIn studied by powder neutron diffraction

The TbPdIn and DyPdIn compounds crystallize in the hexagonal ZrNiAl-type st ructure and exhibit magnetic ordering below T-ord = 66 K and 31 K, respecti vely. We have studied magnetic ordering in these compounds by powder neutro n diffraction. The magnetic structure in TbPdIn is a non-collinear k = (0, 0, 0) structure with Tb moments within the basal plane. Two different magne tic phases are observed in DyPdIn. In the high temperature one, 15 K < T < Tord, the Dy magnetic moments order ferromagnetically along the c-axis. Bel ow 15 K, basal-plane components of Dy moments order antiferromagnetically w ith the propagation vector k = (1/2, 0, 1/2).