Magnetic structures of Fe 32+δ Ge 33 As 2 and Fe 32+δ' Ge 35-x P x intermetallic compounds: a neutron diffraction and 57 Fe Mössbauer spectroscopy study

Fe Ge As and Fe Ge P are quasi-binary intermetallic compounds that possess a rare variant of intergrowth-type crystal structure, which is a combination of the column shaped Co Al and MgFe Ge structure type blocks. The compounds are antiferromagnets with the Néel temperatures around 125 K. Neutron po...

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Published in:Dalton transactions : an international journal of inorganic chemistry 2021-02, Vol.50 (6), p.2210-2220
Main Authors: Khalaniya, R A, Sobolev, A V, Verchenko, V Yu, Tsirlin, A A, Senyshyn, A, Damay, F, Presniakov, I A, Shevelkov, A V
Format: Article
Language:English
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Summary:Fe Ge As and Fe Ge P are quasi-binary intermetallic compounds that possess a rare variant of intergrowth-type crystal structure, which is a combination of the column shaped Co Al and MgFe Ge structure type blocks. The compounds are antiferromagnets with the Néel temperatures around 125 K. Neutron powder diffraction experiments on the samples with δ≈ 0.1, δ'≈ 0.5 and x≈ 3 reveal commensurate magnetic ordering of low symmetry in both compounds and a non-monotonic change in the intensities of magnetic reflections. On the other hand, temperature dependence of the hyperfine fields obtained from Fe Mössbauer spectroscopy indicates a gradual, monotonic increase in local magnetic fields upon cooling. We interpret these results as a spin reorientation within the Co Al -type block of the crystal structure, with the possible formation of a non-collinear magnetic order at low temperatures. Between the compounds, the reorientation occurs at significantly different temperatures, however the resulting magnetic structures themselves are similar as well as the average values of the magnetic moments and the hyperfine fields.
ISSN:1477-9226
1477-9234
DOI:10.1039/D0DT03923C