Abstract
Neutron diffraction study of polycrystalline compounds ErMn 2Si 2, ErMn 2Ge 2 and ErFe 2Si 2 was performed in the temperature range between 1.8 and 293 K. All compounds have tetragonal, ThCr 2Si 2-type crystal structure. The antiferromagnetic collinear structure of ErMn 2Si 2 and ErMn 2Ge 2 at both RT and LNT, consists of a sequence + - + - of ferromagnetic layers of Mn atoms. The magnetic moment of an Mn atom (≈2μ B) is parallel to the c-axist. At low temperatures (LHT and lower), the ferromagnetic ordering within the Er sublattice is observed. The magnetic moment (μ Er ≈ 9μ B) is perpendicular to the c-axis. From the temperature dependence of the intensities of the magnetic peaks, the following values for the Curie temperatures were obtained: (10±5) K for ErMn 2Si 2 and (8.5±3) K for ErMn 2Ge 2. For ErFe 2Si 2 a collinear antiferromagnetic structure of the + - - + type was found, the magnetic unit cell consisting of the chemical one, doubled along the c-axis.
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