Intermediate valence behavior in the novel cage compound CeIr2Zn20
Intermediate valence behavior in the novel cage compound CeIr2Zn20
复制标题
新型笼状化合物 CeIr2Zn20 的中间价行为
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
D. Kaczorowski
中科院分区：
文献类型：
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作者：
P. Swatek;D. Kaczorowski
采用通量法生长了铈金属间化合物CeIr2Zn20的单晶，并通过x射线衍射、磁性、电输运和热力学测量对其进行了研究。该化合物结晶为立方cecr2al20型晶体结构，其中Ce和过渡金属原子位于Al/Zn原子形成的笼内。CeIr2Zn20具有顺磁性和类似金属的导电性。大量的物理数据共同表明，由于不稳定的4f壳层，它具有中间价特征。因此，该材料中的载流子表现出适度的质量增强。在CeIr2Zn20中观察到的物理行为与化合物的电子结构一致，在局部自旋密度近似内计算。
Single crystals of the cerium intermetallic compound CeIr2Zn20 were grown by the flux method, and studied by means of x-ray diffraction, magnetic, electrical transport, and thermodynamic measurements. The compound crystallizes with the cubic CeCr2Al20-type crystal structure, in which the Ce and transition metal atoms are located inside cages formed by the Al/Zn atoms. CeIr2Zn20 shows paramagnetic behavior and metallic-like electrical conductivity. The bulk physical data conjointly indicate its intermediate valence character due to an unstable 4f shell. Accordingly, the charge carriers in this material exhibit moderate mass enhancement. The observed physical behavior in CeIr2Zn20 is in concert with the electronic structure of the compound, calculated within the local spin density approximation.