Magnetic Properties of New Filled Skutterudite Compounds Eu$T_{4}$As12 ($T=\text{Fe}$, Ru, and Os) Synthesized under High Pressure
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概要
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New As-based filled skutterudite compounds Eu$T_{4}$As12 ($T=\text{Fe}$, Ru, and Os) have been synthesized under high pressure; these compounds have lattice constants of 8.3374, 8.5120, and 8.5504 Å, 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 $\mu_{\text{B}}$/Eu) of the compounds suggest that Eu ions in the compounds are in a divalent or mixed-valent state. Magnetic measurements reveal that EuFe4As12 and EuOs4As12 exhibit ferromagnetic-like phase transitions at 152 and 25 K, respectively. By contrast, EuRu4As12 shows no anomaly down to 2 K. The reciprocal susceptibility $\chi^{-1}$ of EuFe4As12 has a nonlinear temperature dependence, which implies that the compound has a canted ferromagnetic or ferrimagnetic structure below 152 K. Furthermore, magnetization measurements of EuFe4As12 show that its magnetic moment is about 4.5 $\mu_{\text{B}}$/Eu at 2 K, which is much less than the magnetic moment (7 $\mu_{\text{B}}$/Eu) expected for Eu2+. The unexpectedly high transition temperature of 152 K in EuFe4As12 could be related to the interaction of Eu 4f moments with the ferromagnetic [Fe4As12] host lattice.
- 2009-09-15
著者
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Yagi Takehiko
Institute For Solid State Physics The University Of Tokyo
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Akahira Keita
Graduate School of Engineering, Muroran Institute of Technology, Muroran, Hokkaido 050-8585
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Sekine Chihiro
Graduate School of Engineering, Muroran Institute of Technology, Muroran, Hokkaido 050-8585
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Ito Koujiro
Graduate School of Engineering, Muroran Institute of Technology, Muroran, Hokkaido 050-8585
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