Metamagnetic transitions in Y0.5Er0.5Fe2D4.2 deuteride studied by high magnetic field and neutron diffraction experiments

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:477

Article

Paul-Boncour, V¹  Isnard, O.^2,3  Guillot, M.⁴  Hoser, A.⁵ 

[1] Univ Paris Est, UPEC, CNRS, ICMPE UMR7182, F-94320 Thiais, France

[2] CNRS, Inst Neel, 25 Rue Martyrs,BP 166X, F-38042 Grenoble, France

[3] Univ Grenoble Alpes, Inst Neel, F-38042 Grenoble, France

[4] CNRS, LNCMI, BP166, F-38042 Grenoble 9, France

[5] Helmult Zentrum Berlin, Glienicker Str 100, D-14109 Berlin, Germany

关键词: Laves phase compound;    Deuteride;    Neutron diffraction;    High magnetic field;    Metamagnetic transitions;   

DOI  :  10.1016/j.jmmm.2019.01.056

来源: Elsevier

【 摘 要 】

The structural and magnetic properties of Y0.5Er0.5Fe2D4.2 deuteride have been investigated by continuous high field magnetic measurements up to 35 T and neutron powder diffraction experiments versus temperature and applied field. Y0.5Er0.5Fe2D4.2 crystallizes in a monoclinic structure (Pc space group) resulting from the deuterium order into 18 interstitial tetrahedral sites. At low field, the deuteride is ferrimagnetic (Ferri) up to 38 K, between 38 and 50 K, it undergoes a first order transition towards an antiferromagnetic (AFM) structure, which remains present up to T-N = 115 K. Upon applied field, two different types of metamagnetic behavior are observed depending on the temperature range. Below 38 K, a forced ferrimagnetic-ferromagnetic (FM) transition is observed at a transition field B-Trans of only 7T (at 2 K), which is among the smallest encountered for Fe rich intermetallics. B-Trans is not very sensitive to temperature changes nor to the Er content and its moderate value is explained by a deuterium induced weakening of the Er-Fe interaction. The second metamagnetic transition, observed between 38 and 150 K, from an AFM (Para) towards a FM structure, is related to the itinerant electron metamagnetic behavior of the Fe sublattice. B-Trans increases linearly versus temperature with a dB/dT slope of 0.24 +/- 0.01 T.K-1. Above B-Trans Er moments parallel to the Fe moments are induced.

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