Photoemission signature of the competition between magnetic order and Kondo effect in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>CeCoGe</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>
Peng Li, Huiqing Ye, Yong Hu, Yuan Fang, Zhiguang Xiao, Zhongzheng Wu, Zhaoyang Shan, R. P. Singh, G. Balakrishnan, Dawei Shen, Yi‐feng Yang, Chao Cao, N. C. Plumb, M. Smidman, M. Shi, Johann Kroha, Huiqiu Yuan, F. Steglich, Yang Liu
Abstract
Competition between magnetic order and the Kondo effect is essential for the rich physics of heavy-fermion systems, but its photoemission signature remains elusive. Here, using high-resolution resonant photoemission, the authors reveal that the intensity of the 4$f$ quasiparticle band in CeCoGe${}_{3}$ exhibits a clear deviation from Kondo-like behavior around the magnetic ordering temperature. The intensity begins to saturate at lower temperatures, coinciding with a change of the magnetic structure. The results demonstrate a distinct scenario for the microscopic coexistence and competition of these phenomena.