Experimental observation of the significant difference between surface and bulk Kondo processes in Kondo lattice YbCuSi

作     者：Yin-Zou Zhao Jiao-Jiao Song Qi-Yi Wu Hao Liu Chen Zhang Bo Chen Hong-Yi Zhang Zhen-Hua Chen Yao-Bo Huang Xue-Qing Ye Ya-Hua Yuan Yu-Xia Duan Jun He Jian-Qiao Meng 

作者机构：School of Physics Central South University Shanghai Institute of Applied Physics Chinese Academy of Sciences 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学:物理学 力学 天文学(英文版))

年 卷 期：2024年

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China (Grant No. 12074436) the National Key Research and Development Program of China (Grant No. 2022YFA1604204) the Science and Technology Innovation Program of Hunan Province (Grant No. 2022RC3068) 

摘      要：Synchrotron-based angle-resolved photoemission spectroscopy was employed to investigate the temperature evolution of the Yb4 f spectral for surface and bulk in the Kondo lattice YbCu2Si2. Our study quantitatively distinguishes between the surface and bulk hybridization processes, revealing that the onset temperatures for both surface and bulk hybridization processes are significantly higher than the Kondo temperature. Additionally, we found that the effective surface Kondo temperature is much lower than that of the bulk. These findings offer valuable insights into the understanding of heavy fermion physics.