Optical study on intermediate-valence compounds Yb1-xLuxAl3
J L Lv(吕佳林)1,2, J L Luo(雒建林)1,2,3, N L Wang(王楠林)3,4
1 Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China;3 Collaborative Innovation Center of Quantum Matter, Beijing 100871, China;4 International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China>
We report an optical spectroscopy study on intermediate valence system Yb1-xLuxAl3 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.
Project supported by the National Natural Science Foundation of China (Grant Nos. 11327806 and GZ1123) and the National Key Research and Development Program of China (Grant Nos. 2016YFA0300902 and 2017YFA0302904).
J L Lv, J L Luo, N L Wang. Optical study on intermediate-valence compounds Yb1-xLuxAl3[J]. Chin. Phys. B, 2018, 27(1): 017803.