Magnetic, thermal, and transport properties of single-crystalline U.sub.3./sub.Fe.sub.4./sub.Ge.sub.4./sub..

0392619 - FZÚ 2014 RIV NL eng J - Journal Article
Henriques, M.S. - Gorbunov, Denis - Waerenborgh, J.C. - Havela, L. - Andreev, Alexander V. - Skourski, Y. - Goncalves, A.P.
Magnetic, thermal, and transport properties of single-crystalline U₃Fe₄Ge₄.
Journal of Alloys and Compounds. Roč. 555, APR (2013), s. 304-310. ISSN 0925-8388. E-ISSN 1873-4669
R&D Projects: GA ČR GAP204/12/0150
Grant - others:AVČR(CZ) M100101203
Institutional support: RVO:68378271
Keywords : actinide alloys * uranium intermetallics * single crystal * magnetization * heat capacity * high magnetic fields
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 2.726, year: 2013

Magnetic, thermal, and transport properties of a U3Fe4Ge4 single crystal have been studied. The compound crystallizes in the orthorhombic Gd3Cu4Ge4 structure type. U3Fe4Ge4 is a ferromagnet with Curie temperature = 18 K. The magnetism originates from the uranium sublattice, as iron atoms have no ordered magnetic moments. U3Fe4Ge4 exhibits a pronounced easy-axis anisotropy with the anisotropy field exceeding 60 T. The spontaneous magnetic moment is Ms = 1.2 μB/f at T = 2 K. Magnetic contribution to specific heat shows a gap excitation behavior, which can be related to the magnon gap due to the anisotropy. The Sommerfeld coefficient of the electronic specific heat is γ = 57 mJ/(mol-U K2) in the ordered state, whereas it is much higher (145 mJ/(mol-U K2) if derived from the paramagnetic state.
Permanent Link: http://hdl.handle.net/11104/0221424