Magnetic structure of TmCu2Ge2

Abstract TmCu 2 Ge 2 compound crystallizes in the tetragonal ThCr 2 Si 2 -type crystal structure. The neutron diffraction reveals the presence of an incommensurate antiferromagnetic order below T N =2.5 K. The Tm magnetic moment of 5.0(1) μ B at 0.47 K is parallel to the c -axis. The order is described by the propagation vector k =[ k x , k x , 0], where k x =0.117(3). The increase of the values of the components k x near the Neel temperature is observed.