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Henriques MS, Gorbunov DI, Waerenborgh JC, Pasturel M, Andreev AV, Dušek M, Skourski Y, Havela L, Gonçalves AP. Synthesis and structural/physical properties of U3Fe2Ge7: a single-crystal study. Inorg Chem 2015; 54:9646-55. [PMID: 26371628 DOI: 10.1021/acs.inorgchem.5b01736] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A single crystal of U3Fe2Ge7 was synthesized by the tin-flux method, and its structural and electronic properties were studied. The compound crystallizes in the orthorhombic crystal structure of La3Co2Sn7 type with two Wyckoff sites for the U atoms. U3Fe2Ge7 displays a ferromagnetic order below TC = 62 K. Magnetization measurements in static (up to 14 T) and pulsed (up to 60 T) magnetic fields revealed a strong two-ion uniaxial magnetic anisotropy. The easy magnetization direction is along the c axis and the spontaneous magnetic moment is 3.3 μB per formula unit at 2 K. The moment per Fe atom is 0.2 μB, as follows from Mössbauer spectroscopy. The magnetic moments are oriented perpendicular to the shortest inter-uranium distances that occur within the zigzag chains in the ab plane, contrary to other U-based isostructural compounds. The magnetization along the a axis reveals a first-order magnetization process that allows for a quantitative description of the magnetic anisotropy in spite of its enormous energetic strength. The strong anisotropy is reflected in the specific heat and electrical resistivity that are affected by a gap in magnon spectrum.
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Affiliation(s)
- Margarida S Henriques
- Institute of Physics, Academy of Sciences of the Czech Republic , Na Slovance 2, 182 21 Prague, Czech Republic.,Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa , P-2695-066 Bobadela, Portugal
| | - Denis I Gorbunov
- Institute of Physics, Academy of Sciences of the Czech Republic , Na Slovance 2, 182 21 Prague, Czech Republic.,Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf , D-01314 Dresden, Germany
| | - João C Waerenborgh
- Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa , P-2695-066 Bobadela, Portugal
| | - Mathieu Pasturel
- Institut des Sciences Chimiques de Rennes, Chimie du Solide et Matériaux, Université Rennes 1, UMR CNRS 6226 , 263 Avenue du Général Leclerc, 35042 Rennes, France
| | - Alexander V Andreev
- Institute of Physics, Academy of Sciences of the Czech Republic , Na Slovance 2, 182 21 Prague, Czech Republic
| | - Michal Dušek
- Institute of Physics, Academy of Sciences of the Czech Republic , Na Slovance 2, 182 21 Prague, Czech Republic
| | - Yurii Skourski
- Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf , D-01314 Dresden, Germany
| | - Ladislav Havela
- Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University , Ke Karlovu 5, 121 16 Prague, Czech Republic
| | - António P Gonçalves
- Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa , P-2695-066 Bobadela, Portugal
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