The two magnetic structures of Ho5Ge4. A neutron diffraction study

The magnetic structure of Ho5Ge4, space group Pnma is studied by neutron diffraction. Between 21 and 18 K the refined three dimensional canted magnetic structure is described in the Pn'm'a' (Ɖ5u and k = 0) space group. The magnetic moment values of the three Ho positions are 6.9, 5.2, 5.8 µB. Below 18 K through a second order transition an additional phase Pa (Ɖ1k and k = ½00) appears. The two structures refined simultaneously at 6 K seem to be in equal amounts and have their moments close to the (010) plane.