Magnetic, thermal, and transport properties of single-crystalline U3Fe4Ge4

作者：Henriques M S^*; Gorbunov D I; Waerenborgh J C; Havela L; Andreev A V; Skourski Y; Goncalves A P

来源：Journal of Alloys and Compounds, 2013, 555: 304-310.

DOI：10.1016/j.jallcom.2012.12.092

• Actinide alloys
• Uranium intermetallics
• Single crystal
• Magnetization
• Heat capacity
• High magnetic fields

Magnetic, thermal, and transport properties of a U3Fe4Ge4 single crystal have been studied. The compound crystallizes in the orthorhombic Gd3Cu4Ge4 structure type. U3Fe4Ge4 displays ferromagnetic order below the Curie temperature T-C = 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 M-s = 1.2 mu(B)/f.u. at T = 2 K. Magnetic contribution to specific heat shows a gap excitation behavior with Delta = 4 meV, which can be related to the magnon gap due to the anisotropy. The Sommerfeld coefficient of the electronic specific heat is gamma = 57 mJ/(mol-U K-2) in the ordered state, whereas it is much higher (145 mJ/(mol-U K-2) if derived from the paramagnetic state. Electrical resistivity has very high values on the m Omega cm range.

• 出版日期2013-4-5