High Pressure Properties for Electrical Resistivity and Ce Valence State of Heavy-Fermion Antiferromagnet Ce2NiGa12
High Pressure Properties for Electrical Resistivity and Ce Valence State of Heavy-Fermion Antiferromagnet Ce2NiGa12
复制标题
重费米子反铁磁体 Ce2NiGa12 的电阻率和 Ce 价态的高压特性
DOI：
10.1088/1742-6596/568/4/042015
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
and S. Watanabe
中科院分区：
文献类型：
--
作者：
N. Kawamura;R. Sasaki;K. Matsubayashi;N. Ishimatsu;M. Mizumaki;Y. Uwatoko;S. Ohara;and S. Watanabe
从压力效应的角度研究了重费米子反铁磁体Ce 2NiGa 12.电阻率测量结果表明，在P_C~ 5.5GPa时，反铁磁有序被抑制，P_C以上出现费米液体行为。为了研究Ce的价态是如何与所观察到的临界现象相关联的，在CeL 3边的X射线吸收谱已经完成。在初始加压过程中，Ce的价态在Pv ~ 9 GPa处发生剧烈变化，而在Pc附近的压力下，Ce的价态没有出现反常行为。因此，Ce 2NiGa 12中P C附近的量子临界现象与Ce的价态没有很强的联系.
A heavy-fermion antiferromagnet Ce 2 NiGa 12 has been studied at a viewpoint of pressure effects. Electrical resistivity measurements show that the antiferromagnetic ordering is suppressed at P C~ 5.5 GPa, and that Fermi liquid behaviour is observed above P C. To investigate how Ce valence state is associated with the observed critical phenomena, X-ray absorption spectra at Ce L 3-edge have been performed. Ce valence state drastically varies at P v~ 9 GPa in the initial applying pressure process, whereas anomalous behaviour is not observed in the Ce valence under pressures around P C. Consequently, the quantum critical phenomena in Ce 2 NiGa 12 around P C is not strongly connected with Ce valence state.