Successive magnetic phase transitions of TbRu2Ge2

Successive magnetic phase transitions of the tetragonal compound TbRu2Ge2 have been studied by neutron diffraction using a single crystal. Three magnetic phase transitions at 4, 30 and 37 K (= T-N) were confirmed. These magnetic structures are an anti-phase structure with the propagation vector k(1) = (0.235, 0, 0) (0.235 = 4/17), an amplitude-modulated structure with k(1) and a sinusoidal modulated structure with k(1) and k(2) = (0.247, 0, 0), respectively, for low, middle and high temperatures.