Point-Contact Spectroscopy of Heavy Fermion Compounds CeCu6 and CeAl3 in Mangetic Field
Point-Contact Spectroscopy of Heavy Fermion Compounds CeCu6 and CeAl3 in Mangetic Field
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磁场中重费米子化合物 CeCu6 和 CeAl3 的点接触光谱
DOI：
10.1016/j.phpro.2015.12.035
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Y. Uwatoko
中科院分区：
文献类型：
--
作者：
G. Motoyama;S. Ogawa;K. Matsubayashi;K. Fujiwara;K. MIyoshi;S. Nishigori;T. Mutou;A. Yamaguchi;A. Sumiyama;Y. Uwatoko
我们对CeCu_6和CeAl_3进行了点接触光谱测量，研究了这些重费米子态。详细观察了点接触光谱的温度和磁场依赖性。在最低温度0.4K时，CeCu6和CeAl3的微分电阻谱随偏压的变化呈现出各自不同的极小值结构和附加的小峰结构。这些光谱的温度演化开始于与近藤效应相关的温度，尽管最小值和峰值结构在两种化合物的光谱之间反向出现。在磁场中，这两种结构单调变化，没有明显的变化，没有变化的磁场曲率依赖于微分电阻的大小在零偏置电压在临界磁场的亚磁化。这一行为与CeAl_2的反铁磁有序行为不同。这一结果可能表明，PCS能够区分重费米子态和反铁磁态。
We have carried out point-contact spectroscopy measurements on CeCu6and CeAl3to study these heavy fermion states. Temperature and magnetic field dependences of the point-contact spectra were observed in detail. At the lowest temperature of 0.4 K, differential resistance spectra of CeCu6and CeAl3as function of bias voltage exhibit each distinct minimum structure and additional small peak structure. Temperature evolutions of these spectra started at temperatures related to the Kondo effect, although the minimum and the peak structure emerged in reverse between both spectra of two compounds. In magnetic fields, both structures monotonically change with no distinct change without a change of curvature of magnetic field dependence of magnitude of differential resistance at zero bias voltage at critical magnetic field of meta-magnetization. This behavior in magnetic field is different from that of CeAl2, which shows antiferromagnetic ordering. This result may suggest that PCS is able to discriminate between heavy fermion state and antiferromagnetic state.