A. SzytuŁa

Magnetic ordering in HoRu2Si2, HoRh2Si2, TbRh2Si2 and TbIr2Si2 by neutron diffraction

Abstract Neutron diffraction study of polycrystalline HoRu 2 Si 2 , HoRh 2 Si 2 , TbRh 2 Si 2 , and TbIr 2 Si 2 was performed in the temperature range between 4.2 and 300 K. For HoRu 2 Si 2 the magnetic spin alignment of a linear transverse wave mode below the Neel temperature 19 K is observed. This static moment wave is propagating along the b -axis with k =(0, 0.2, 0) and is polarized in the c -axis. The root-mean-square and maximum saturation moments per Ho atom are 9.26 and 13.09μ B , respectively. HoRh 2 Si 2 , TbRh 2 Si 2 an TbIr 2 Si 2 are simple collinear antiferromagnets of +-+- type with Neel temperatures of (27±1), (98±2) and (72±3) K, respectively. For TbRh 2 Si 2 and TbIr 2 Si 2 magnetic moments are localized on RE ions only and are aligned along the tetragonal axis, while for HoRh 2 Si 2 they form an angle o = (28±3)°.

Crystal and magnetic structure of CoMnGe, CoFeGe, FeMnGe and NiFeGe

Abstract The crystal and magnetic properties of CoMnGe, CoFeGe, FeMnGe and NiFeGe compounds are investigated with X-ray, neutron diffraction, magnetometric and Mossbauer effect methods. All compounds have hexagonal Ni 2 In-type crystal structure and ferromagnetic properties at low temperatures (except for NiFeGe). Neutron diffraction experiments indicate that the compounds CoMnGe and CoFeGe have a collinear magnetic structure while FeMnGe a noncollinear. The magnetic moments are localized only on Mn and Fe atoms and lie in the basal plane.

Magnetic structures of RERhSi (RE = Tb, Ho, Er) compounds

Abstract Magnetic structures of TbRhSi (a), HoRhSi (b) and ErRhSi (c) were determined by neutron diffraction using polycrystalline samples RERhSi compounds crystallize in the orthorhombic NiTiSi type structure. The magnetic moments on RE ions order antiferromagnetically below (13±1) K (a), (11±1) K (b) and (12±1) K (c). The magnetic structure of TbRhSi and ErRhSi is a double flat spiral, that of HoRhSi is collinear with two directions of the magnetic moment.