Abstract
Ternary R 3Cu 4X 4 (R=Tb –Er; X=Si, Ge, Sn) compounds were investigated by means of neutron powder diffraction and magnetization measurements. The compounds crystallize in the orthorhombic Gd 3Cu 4Ge 4-type crystal structure (space group Immm). The rare-earth atoms occupy two inequivalent 2d and 4e sublattices. The magnetic moments are localized exclusively on the rare earths and order at low temperatures. On the basis of the collected data thermal dependence of the magnetic structure was determined.
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