Abstract
Neutron-diffraction patterns recorded in the paramagnetic state confirmed that R5Rh4Ge10 (R = Tb, Ho, Er) compounds exhibit the tetragonal Sc5Co4Si10 (P4/mbm space group)-type of crystal structure. In this structure the rare-earth atoms R occupy three nonequivalent atomic positions. The low-temperature neutron-diffraction data confirm the change of the magnetic structure at Tt=3.8 and at the Neel temperature TN=11.5 K for R = Tb, at TN=7 K for R = Ho, and at Tt=4.2 K and TN=5.5 K for R = Er. In all these compounds the rare-earth moments form complex antiferromagnetic structures: collinear in the case of Tb and Ho compounds, sine-wave-modulated for Er5Rh4Ge10 with the wave vector k= $\frac\Box1\Box\Box4\Box$ , $\frac\Box1\Box\Box4\Box$ ,0 for 1.5 K<T<4.2 K and $\frac\Box1\Box\Box3\Box$ , $\frac\Box1\Box\Box3\Box$ ,0 for 4.2 K up to TN. The magnetic moment values are different in different sublattices.
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