Antiferromagnetic Order in the Half-Heusler Phase TbPdBi

Single crystals of TbPdBi, a representative of the group of half-Heusler bismuthides, were studied by means of magnetic susceptibility, heat capacity, electrical resistivity, magnetostriction and thermal expansion measurements.The compound was characterized as an antiferromagnet with the Néel temperature TN 5.3 K. Neutron diffraction experiment confirmed the antiferromagnetic ordering and yielded the propagation vector k p 1 2 , 1 2 , 1 2 q.Remarkably, this k vector is in accord with the recently developed theory of antiferromagnetic topological insulators.