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  Penc, B.; Gerischer, S.; Hoser, A.; Szytula, A.: Magnetic structure of TmCu₂Ge₂. Journal of Magnetism and Magnetic Materials 324 (2012), p. 657-659

10.1016/j.jmmm.2011.09.033

Abstract:
TmCu2Ge2 compound crystallizes in the tetragonal ThCr2Si2-type crystal structure. The neutron diffraction reveals the presence of an incommensurate antiferromagnetic order below TN=2.5 K. The Tm magnetic moment of 5.0(1) μB at 0.47 K is parallel to the c-axis. The order is described by the propagation vector k=[kx, kx, 0], where kx=0.117(3). The increase of the values of the components kx near the Néel temperature is observed.