Neutron diffraction studies of Tb_2Rh_3Si_5 compound

摘要

In this work neutron diffraction studies of Tb_2Rh_3Si_5 compound are reported. The compound crystallizes in the monoclinic crystal structure of Lu_2Co_3Si_5-type. At 1.5 K an antiferromagnetic ordering with a propagation vector k=(1/2;1/2;1/2) was observed. The Tb magnetic moments of 9.8(2) μ_B form a non-collinear magnetic structure. In the vicinity of Neel temperature of 8 K a change of the magnetic ordering is evidenced. The change seems to be connected with phase transition from commensurate to incommensurate sine-wave modulation of the Tb magnetic moments.