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Journal articles
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.
https://hal-univ-rennes1.archives-ouvertes.fr/hal-01205440
Contributor : Laurent Jonchère <>
Submitted on : Friday, September 25, 2015 - 2:52:35 PM
Last modification on : Wednesday, April 7, 2021 - 3:18:08 PM
Contributor : Laurent Jonchère <>
Submitted on : Friday, September 25, 2015 - 2:52:35 PM
Last modification on : Wednesday, April 7, 2021 - 3:18:08 PM