Abstract
New As-based filled skutterudite compounds Eu T 4 As 12 ( T =Fe, Ru, and Os) have been synthesized under high pressure; these compounds have lattice constants of 8.3374, 8.5120, and 8.5504 A, respectively, which are larger than those expected from the lanthanide contraction in trivalent ions. The large lattice constants and effective magnetic moments (6.9–8.3 µ B /Eu) of the compounds suggest that Eu ions in the compounds are in a divalent or mixed-valent state. Magnetic measurements reveal that EuFe 4 As 12 and EuOs 4 As 12 exhibit ferromagnetic-like phase transitions at 152 and 25 K, respectively. By contrast, EuRu 4 As 12 shows no anomaly down to 2 K. The reciprocal susceptibility χ -1 of EuFe 4 As 12 has a nonlinear temperature dependence, which implies that the compound has a canted ferromagnetic or ferrimagnetic structure below 152 K. Furthermore, magnetization measurements of EuFe 4 As 12 show that its magnetic moment is about 4.5 µ B /Eu at 2 K, which is much less than the magnetic moment (7 µ B /...
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