Formation of a Hybridization Gap in a Cage-Like Compound CeFe2Al10
Formation of a Hybridization Gap in a Cage-Like Compound CeFe2Al10
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DOI：
10.1143/jpsj.78.083707
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发表时间：
2009-07
影响因子：
1.7
通讯作者：
Y. Muro;K. Motoya;Y. Saiga;T. Takabatake
中科院分区：
文献类型：
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作者：
Y. Muro;K. Motoya;Y. Saiga;T. Takabatake
我们报道了一种笼状化合物cefe2al10的磁性、输运和热性质，该化合物结晶为正交ybfe2al10型结构。磁化率在70 K处出现宽峰，表明cefe2al10是价涨落化合物。电阻率和霍尔系数在20k以下急剧上升，热功率迅速下降。这些输运性质的低温异常类似于典型的近藤半导体CeRhSb。这些特征表明cefe2al10在低于20k冷却时形成了杂化间隙。根据电阻率的热活化能估计能隙为15 K。比热的磁贡献在30k时显示出肖特基型最大值，这为cefe2al10的间隙形成提供了另一个证据。
We report on the magnetic, transport, and thermal properties of a cage-like compound CeFe 2 Al 10 that crystallizes in the orthorhombic YbFe 2 Al 10 -type structure. A broad peak in the magnetic susceptibility at 70 K indicates that CeFe 2 Al 10 is a valence fluctuation compound. The electrical resistivity and the Hall coefficient exhibit sharp upturns below 20 K, where the thermopower shows a rapid decrease. These low-temperature anomalies in the transport properties resemble those of a typical Kondo semiconductor CeRhSb. These features indicate the formation of a hybridization gap in CeFe 2 Al 10 on cooling below 20 K. The energy gap is estimated as 15 K from the thermal activation energy of the resistivity. The magnetic contribution of the specific heat shows a Schottky-type maximum at 30 K that provides another evidence for the gap formation in CeFe 2 Al 10 .