Antiferromagnetic ordering in PrCu2Si2, PrCu2Ge2 and TbCuSi2

Nature of magnetic phase transitions in TbCu2X2 (X=Si, Ge) and HoCu2Si2 compounds

“…The values of Tb magnetic moments equal 8.74(12) B and 8.70(6) B for TbCu 2 Si 2 and TbCu 2 Ge 2 , respectively. These values are in agreement with previously published data [6][7][8][9] and they are close to 9.0 B which is the free Tb 3+ value. The temperature dependencies of the magnetic peak intensities provide the Néel temperatures equal to 12 and 13 K for TbCu 2 Si 2 and TbCu 2 Ge 2 , respectively (see Figs.…”

“…The reflections of magnetic origin found in the patterns measured at low temperatures (close to 1.5 K) can be indexed using the propagation vector k = [(1/2), 0, (1/2)]. These patterns are similar to those reported in previous papers [6][7][8][9]. The corresponding magnetic ordering can be described as ferromagnetic (1 0 1) layers stacked antiferromagnetically.…”

“…HoCu 2 Si 2 . Neutron diffraction experiments carried out on polycrystalline samples revealed the presence of an antiferromagnetic ordering of the AFIV-type in TbCu 2 Si 2 [6][7][8], HoCu 2 Si 2 [6,7] and TbCu 2 Ge 2 [6,9]. The temperature dependence of magnetic peak intensities indicated that this type of the magnetic ordering was stable up to the Néel temperature [6][7][8][9].…”

Novel magnetization processes of NdCu2Si2 single crystal

“…This result shows that the antiferromagnetic structure is the AF-type I: a simple collinear one with the wave vector Q = (0, 0, 1) and magnetic moments parallel to the c-axis, consisting of ferromagnetic c-planes coupled antiferromagnetically with the + − + − sequence. This structure is a similar one to PrCu 2 Ge 2 [8,9] and NdCu 2 Ge 2 [5]. It is consistent with the positive sign of Θ a and the negative sign of Θ c : indication of an intra-layer ferromagnetic coupling and an inter-layer antiferromagnetic coupling.…”

Magnetic ordering in PrT2Ge2 (T = Ni, Ru and Rh) compounds

“…The hitherto investigations of the PrT 2 X 2 compounds revealed collinear antiferromagnetic orderings described by propagation vector k ¼ (0,0,1) (AFI-type [2]) in PrCu 2 X 2 (X ¼ Si, Ge) [3,4], PrRh 2 Si 2 [5], and PrAu 2 Ge 2 [6] or propagation vector k ¼ (0, 0, ½) in PrFe 2 X 2 [7,8]. In turn, sine-modulated magnetic structures with k ¼ (0, 0, k z ) were established for PrNi 2 Si 2 [9,10], PrCo 2 Ge 2 [11,12] and PrPd 2 Ge 2 [13].…”