Effects of high pressure on the structural, magnetic, and transport properties of the itinerant 5fferromagnetU2Fe3Ge

Structural and electronic response of U3Fe4Ge4 to high pressure

“…8) and U 2 Fe 3 Ge. 9 Such effects are an inherent consequence of the lattice compression, which in turn follows the U-U bonding anisotropy. This situation changes when the localization threshold is approached, and the simple 5f band model is not applicable any more.…”

“…13 Such situation was disclosed for U compounds where a pronounced bonding directionality could be determined, as for those belonging to the ZrNiAl isotype (hexagonal), 14 the TiNiSi structure type (orthorhombic) 15 and for the ternary C14 Laves phase U 2 Fe 3 Ge. 9 Recently, a novel itinerant ferromagnet U 3 Fe 4 Ge 4 was characterized. 16,17 The compound presents a special interest since its magnetic order is related exclusively to the uranium sublattice (iron atoms have no ordered magnetic moment).…”

Synthesis and Structural/Physical Properties of U3Fe2Ge7: A Single-Crystal Study

“…In U 9 Fe 7 Ge 24 (tetragonal structure), a sizable U-5f and Ge-4p overlap exists . The 3d Fe states are also substantially delocalized, and a paramagnetic behavior was observed down to 2 K. U 2 Fe 3 Ge (hexagonal structure) and U 3 Fe 4 Ge 4 (orthorhombic structure) are itinerant ferromagnets. − Their magnetism is dominated by the uranium; no intrinsic Fe magnetic moment is formed. While U 3 Fe 4 Ge 4 exhibits a strong uniaxial magnetic anisotropy with the anisotropy field μ 0 H a exceeding 60 T, U 2 Fe 3 Ge is much less anisotropic (μ 0 H a = 8 T), not typical of uranium intermetallic compounds.…”