Synthesis and structural/physical properties of U.sub.3./sub.Fe.sub.2./sub.Ge.sub.7./sub.: a single-crystal study

0450430 - FZÚ 2016 RIV US eng J - Journal Article
Henriques, Margarida Isabel Sousa - Gorbunov, Denis - Waerenborgh, J.C. - Pasturel, M. - Andreev, Alexander V. - Dušek, Michal - Skourski, Y. - Havela, L. - Gonc{alves, A.P.
Synthesis and structural/physical properties of U₃Fe₂Ge₇: a single-crystal study.
Inorganic Chemistry. Roč. 54, č. 19 (2015), s. 9646-9655. ISSN 0020-1669. E-ISSN 1520-510X
R&D Projects: GA ČR(CZ) GA14-03276S
Grant - others:AVČR(CZ) M100101203
Institutional support: RVO:68378271
Keywords : uranium intermetallics * ferromagnetism * magnetic anisotropy
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 4.820, year: 2015

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 with two sites for the U atoms. It is a ferromagnet below TC = 62 K. Magnetization measurements in static (up to 14 T) and pulsed (up to 60 T) magnetic fields revealed a strong uniaxial magnetic anisotropy. The easy magnetization direction is along the c axis and a spontaneous magnetic moment of 3.3 mB per formula unit at 2 K. The moment per Fe atom is 0.2 mB, 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. The magnetization along the a axis reveals a first-order magnetization process that allows for a quantitative description of the magnetic anisotropy.
Permanent Link: http://hdl.handle.net/11104/0251708