Optical study on intermediate-valence compounds Yb_(1-x)Lu_xAl_3

作     者：吕佳林 雒建林 王楠林 

作者机构：Institute of Physics Chinese Academy of Sciences School of Physical Sciences University of Chinese Academy of Sciences Collaborative Innovation Center of Quantum Matter International Center for Quantum Materials School of Physics Peking University 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2018年第27卷第1期

页      面：209-214页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11327806 and GZ1123) the National Key Research and Development Program of China(Grant Nos.2016YFA0300902 and 2017YFA0302904) 

主　　题：heavy fermions intermediate valence system optical conductivity hybridization effect 

摘      要：We report an optical spectroscopy study on intermediate valence system Ybl-xLuxA13 with x = 0, 0.25, 0.5, 0.75, and 1. The Kondo temperature in the system is known to increase with increasing Lu concentration. Therefore, it is expected that the energy scale of the hybridization gap should increase with increasing Lu concentration based on the periodic Anderson model. On the contrary, we find that the spectral structure associated with the hybridization effect shifts monotonically to lower energy. Furthermore, the Lu substitution results in a substantial increase of the free carrier spectral weight and less pronounced plasma frequency reduction upon lowering temperature. We attribute the effect to the disruption of the Kondo lattice periodicity by the random substitution of Yb by Lu. The work highlights the importance of the lattice periodicity of the rare earth element for understanding the Kondo lattice phenomena.