The magnetic ordering in the Ho5Si3 and Ho5Ge3 compounds

For Ho5Ge3, between TN1 = 27(2) and TN2 = 18(4) K, the sine-modulated ordering is realized through the propagation vectors K1 = [0, 0, ±3/10] and K2 = [0, 1/2, 0], whilst below TN2 the ordering takes place with propagation vectors K1 = [0, 0, ±3/10], K2 = [0, 1/2, 0], K3 = [0, 0, ±2/5] and K4 = [±1/5, ±1/5, 0]. For both the Ho5Si3 and Ho5Ge3 compounds, the dimensions of the magnetic unit cell are 5a × 5a × 10c times the crystal unit cell of Mn5Si3-type.