High pressure electrical resistivity of CeCuAl3
High pressure electrical resistivity of CeCuAl3
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DOI：
10.1088/1742-6596/200/1/012082
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
Y. Kawamura;T. Nishioka;H. Kato;M. Matsumura;K. Matsubayashi;Y. Uwatoko
中科院分区：
文献类型：
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作者：
Y. Kawamura;T. Nishioka;H. Kato;M. Matsumura;K. Matsubayashi;Y. Uwatoko
电阻率的测量 ?据报道，使用活塞缸压力传感器在高达 20 kbar 的压力下以及使用立方砧压力传感器在高达 80 kbar 的压力下对反铁磁近藤化合物 BaNiSn3 型 CeCuAl3 进行了研究。温度依赖性？环境压力下的 N?el 温度在 3.4 K 处出现扭结，而 ?(T) 中的磁贡献表明分别在 10 K 和 150 K 处有两个宽峰。随着压力增加至 60 kbar，N?el 温度逐渐升高，并在 80 kbar 时突然消失。两个宽峰在压力下相互接近，并在 80 kbar 压力下于 40 K 左右合并为一个宽峰。这种压力变化可以通过晶体电场效应影响的近藤效应很好地描述，并且表明近藤效应随压力的增强。由于这些结果是通过 Doniach 相图定性解释的，因此我们认为 CeCuAl3 是弱近藤反铁磁体，并且量子临界点存在于 60 至 80 kbar 之间。
Measurements of the electrical resistivity ? of an antiferromagnetic Kondo compound BaNiSn3-type CeCuAl3 at pressures up to 20 kbar using piston cylinder pressure cell and up to 80 kbar using a cubic anvil pressure cell are reported. The temperature dependence of ? at ambient pressure shows a kink for the N?el temperature at 3.4 K and the magnetic contribution in ?(T) indicates two broad peaks at 10 K and 150 K, respectively. The N?el temperature gradually increases with increasing pressure up to 60 kbar, and suddenly disappears at 80 kbar. The two broad peaks approach each other with pressure and merge into one broad peak at around 40 K at a pressure of 80 kbar. This pressure variation is well described by Kondo effect influenced by crystalline electric field effect, and indicates enhancement of Kondo effect with pressure. Since these results are qualitatively interpreted by Doniach's phase diagram, we suggest that CeCuAl3 is a weak Kondo antiferromagnet and quantum critical point exists between 60 and 80 kbar.