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Synthesis and Structural/Physical Properties of U3Fe2Ge7: A Single-Crystal Study

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 Mossbauer 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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Submitted on : Friday, September 25, 2015 - 2:52:35 PM
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Margarida S. Henriques, Denis I. Gorbunov, Alexander V. Andreev, Michal Dusek, Joao C. Waerenborgh, et al.. Synthesis and Structural/Physical Properties of U3Fe2Ge7: A Single-Crystal Study. Inorganic Chemistry, American Chemical Society, 2015, 54 (19), pp.9646-9655. ⟨10.1021/acs.inorgchem.5b01736⟩. ⟨hal-01205440⟩



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