1. Synthesis and Structural/Physical Properties of U3Fe2Ge7: A Single-Crystal Study.
- Author
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Henriques, Margarida S., Gorbunov, Denis I., Waerenborgh, Joao C., Pasturel, Mathieu, Andreev, Alexander V., Dusek, Michal, Skourski, Yurii, Havela, Ladislav, and Goncalves, Antonio P.
- Subjects
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SINGLE crystals , *CATALYTIC activity , *THERMAL properties , *CHEMICAL synthesis , *CRYSTAL structure , *ELIMINATION reactions , *COUPLING reactions (Chemistry) , *PHYSICAL & theoretical chemistry - Abstract
Single crystals of U3Fe2Ge7 are grown from an equimolar mixture of the elements in a tin flux (graphite crucible in evacuated silica tubes, 1273 K, 2 d; cooling to 573 K with a rate of 5 K/h). The compound crystallizes with the La3Co2Sn7 type structure in the orthorhombic space group Cmmm (Z = 2, single crystal XRD) with two Wyckoff sites for the U atoms. It orders ferromagnetically below 62 K and shows a strong two-ion uniaxial magnetic anisotropy upon magnetization in static (<14 T) and pulsed (<60 T) magnetic fields. The material is easily magnetized along the c axis with a spontaneous magnetic moment of 3.3 μB/f.u. at 2 K. Moessbauer data show a moment of 0.2 μ B per Fe atom. 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 the magnon spectrum. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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