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Magnetic transitions with magnetocaloric effects near room temperature related to structural transitions in Y0.9Pr0.1Fe2D3.5 deuteride
Univ Paris Est Creteil, ICMPE UMR7182, CNRS, 2 Rue Henri Dunant, F-94320 Thiais, France..
Univ Paris Est Creteil, ICMPE UMR7182, CNRS, 2 Rue Henri Dunant, F-94320 Thiais, France.;Univ Basque Country, UPV EHU, Dept Fis Aplicada 1, Escuela Ingn Bilbao, Plaza Torres Quevedo 1, Bilbao 48013, Spain..
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry. Univ Paris Est Creteil, ICMPE UMR7182, CNRS, 2 Rue Henri Dunant, F-94320 Thiais, France.ORCID iD: 0000-0002-8690-9957
Univ Paris Est Creteil, ICMPE UMR7182, CNRS, 2 Rue Henri Dunant, F-94320 Thiais, France..
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2021 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 130, no 11, article id 113904Article in journal (Refereed) Published
Abstract [en]

The structural and magnetic properties of Y0.9Pr0.1Fe2D3.5 deuteride have been investigated by synchrotron and neutron diffraction, magnetic measurements, and differential scanning calorimetry. Deuterium insertion induces a 23.5% cell volume increase and a lowering of crystal symmetry compared to the cubic C15 Y0.9Pr0.1Fe2 parent compound (Fd-3m SG). The deuteride is monoclinic (P2(1)/c SG) below 330 K and undergoes a first-order transition between 330 and 350 K toward a pseudo-cubic structure (R-3 m SG) with TO-D = 342(2) K. In both structures, the D atoms are located in 96% R2Fe2 and 4% RFe3 tetrahedral interstitial sites (R = Y0.9Pr0.1). The compound is ferromagnetic, accompanied by a magnetostrictive effect below T-C = 274 K. The analysis of the critical exponents indicates a second-order type transition with a deviation from the isotropic 3D Heisenberg model toward the 3D XY model. This implies an easy plane of magnetization in agreement with cell parameter variation showing planar magnetic orientation. A weak magnetic peak is even observed at the order-disorder transition with a maximum at 343 K. Magnetic entropy variations are characteristic of direct and inverse magnetocaloric effects at T-C and TO-D, respectively.

Place, publisher, year, edition, pages
AIP Publishing American Institute of Physics (AIP), 2021. Vol. 130, no 11, article id 113904
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Condensed Matter Physics
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URN: urn:nbn:se:uu:diva-456829DOI: 10.1063/5.0061200ISI: 000697564000004OAI: oai:DiVA.org:uu-456829DiVA, id: diva2:1607372
Available from: 2021-11-01 Created: 2021-11-01 Last updated: 2024-01-15Bibliographically approved

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Shtender, Vitalii

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