ACTA

Magnetic Structures of Ho₅Rh₄Ge₁₀

A. Szytuła^a, B. Penc^a, M. Hofmann^b and W. Sikora^c
^aInstitute of Physics, Jagiellonian University, W.S. Reymonta 4, 30-059 Kraków, Poland
^bForschungsneutronenquelle Heinz Maier-Leibnitz (FRMII), Technische Universität Munchen, 85747 Garching, Germany
^cAGH University of Science and Technology, Faculty of Physics and Applied Computer Science, al. A. Mickiewicza 30, 30-059 Krakow, Poland

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A powder diffraction measurement of Ho₅Rh₄Ge₁₀ is reported. This compound crystallizes in the tetragonal Sc₅Co₄Si₁₀-type structure (space group P4/mbm) in which the Ho atoms occupy three different sites. The neutron diffraction measurements indicate antiferromagnetic order with the Néel temperature T_N=7 K. Below T_N an additional phase transition at 4.5 K connected with the change of the magnetic structure is observed. The Ho moments in 4(h) site form: collinear order up to T_N while moments at 2(a) site form sine modulated structure. Determined experimentally magnetic structures are compared to the results of symmetry analysis.

DOI: 10.12693/APhysPolA.124.1002
PACS numbers: 75.25.-j, 75.47.Pq, 75.50.Ee