Mossbauer study of magnetism in Fe3Se4

JOURNAL OF ALLOYS AND COMPOUNDS

卷:746

Article

Pohjonen, R.¹  Mustonen, O.²  Karppinen, M.²  Linden, J.¹ 

[1] Abo Akad Univ, Fac Nat Sci & Engn Phys, Porthansgatan 3, FI-20500 Turku, Finland

[2] Aalto Univ, Dept Chem, Kemistintie 1, FI-00076 Aalto, Finland

关键词: Fe-57 Mossbauer spectroscopy;    Iron selenide;    Fractional valence;    Ferrimagnetism;   

DOI  :  10.1016/j.jallcom.2018.02.257

来源: Elsevier

【 摘 要 】

We have investigated the magnetism of ferrimagnetic Fe3Se4. A monoclinic Fe3Se4 powder sample was synthesized using an ampule technique. Magnetic properties were studied using Fe-57 Mossbauer spectroscopy measurements. The spectra were recorded between 77 and 360 K. Fitting could be done using four spectral components: two for each iron site in the lattice, or using only two components, each with a correlated distribution of the hyperfine parameters. Using the latter method the hyperfine parameter sets for each component were obtained from two distributions, tentatively taken as the local iron charge, i.e. the spectra were analyzed assuming the presence of a modulation of the iron valence. The crystal-lographic 1:2 ratio of the iron sites is reflected in the intensities of the magnetic Mossbauer spectra, whether one is using two or four components, but above TC only the correlated two-component fitting was successful. (C) 2018 Elsevier B.V. All rights reserved.

【 授权许可】

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