Synthesis and physical properties of a new caged compound Ce3Pd20As6 of the C6Cr23-type structure
Synthesis and physical properties of a new caged compound Ce3Pd20As6 of the C6Cr23-type structure
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C6Cr23型结构新型笼状化合物Ce3Pd20As6的合成及物理性能
DOI：
10.1016/j.jallcom.2014.10.144
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
J. Kitagawa
中科院分区：
文献类型：
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作者：
K. Orita;K. Uenishi;M. Tsubota;Y. Shimada;T. Onimaru;T. Takabatake;J. Kitagawa
我们发现Ce3Pd20As6晶体为立方C6Cr23型结构.结合化学成分的电子探针显微分析和粉末X射线衍射图的Rietveld分析，揭示了可变化学计量的不均匀原子组成。通过测量Ce3Pd20As6的磁化强度、电阻率和比热容，研究了Ce3Pd20As6的物理性质. Ce3+离子的4f电子局域性很好，但在0.5K以下没有相变。金属电阻率显示出弱的近藤屏蔽。残余电阻率相当低，可能是由于化学计量比的变化。磁化强度曲线和磁熵表明，在两个Ce晶位中至少有一个处于Γ 8四重晶体电场基态。
We have found that Ce 3 Pd 20 As 6 crystallizes into a cubic C 6 Cr 23-type structure. Combination of electron probe microanalysis of the chemical composition and Rietveld analysis of the powder X-ray diffraction pattern has revealed an inhomogeneous atomic composition of variable stoichiometry. The physical properties of Ce 3 Pd 20 As 6 were investigated by measuring the magnetization, electrical resistivity and specific heat. The 4f electrons of Ce 3+ ions are well localized but do not show phase transition down to 0.5 K. The metallic electrical resistivity shows a weak Kondo screening. The residual resistivity ratio is rather low probably due to the variable stoichiometry. The magnetization curve and magnetic entropy suggest the Γ 8 quartet crystalline-electric-field ground state at least one of two Ce sites.