TbCuSn (hexagonal, LiGaGe-type crystal structure) exhibits at 1.5 K a
magnetic ordering described by the wave vector k = [1/2, 0, 0] with mo
ments aligned along the b-axis. At 12.6 K an additional incommensurate
sine modulated ordering appears (k = [0.45, 0, 0]) with magnetic mome
nts aligned also along the b-axis. The Neel point of TbCuSn has been d
etermined to be at 15.3 K. (C) 1997 Elsevier Science Ltd.