Photoemission signature of the competition between magnetic order and Kondo 
effect in CeCoGe3

Li, Peng; Ye, Huiqing; Hu, Yong; Fang, Yuan; Xiao, Zhiguang; Wu, Zhongzheng; Shan, Zhaoyang; Singh, Ravi P.; Balakrishnan, Geetha; Shen, Dawei; Yang, Yi-feng; Cao, Chao; Plumb, Nicholas C.; Smidman, Michael; Shi, Ming; Kroha, Johann; Yuan, Huiqiu; Steglich, Frank; Liu, Yang

doi:10.1103/PhysRevB.107.L201104

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Photoemission signature of the competition between magnetic order and Kondo effect in CeCoGe₃

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Steglich, Frank
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Li, P., Ye, H., Hu, Y., Fang, Y., Xiao, Z., Wu, Z., et al. (2023). Photoemission signature of the competition between magnetic order and Kondo effect in CeCoGe₃. Physical Review B, 107(20): L201104, pp. 1-6. doi:10.1103/PhysRevB.107.L201104.

Cite as: https://hdl.handle.net/21.11116/0000-000D-65D5-1

Abstract

The competition between magnetic order and Kondo effect is essential for the rich physics of heavy fermion systems. Nevertheless, how such competition is manifested in the quasiparticle bands in a real periodic lattice remains elusive in spectroscopic experiments. Here we report a high-resolution photoemission study of the antiferromagnetic Kondo lattice system CeCoGe3 with a high TN1 of 21 K. Our measurements reveal a weakly dispersive 4 f band at the Fermi level near the Z point, arising from a moderate Kondo effect. The intensity of this heavy 4 f band exhibits a logarithmic increase with lowering temperature and begins to deviate from this Kondo-like behavior below -25 K, just above TN1, and eventually ceases to grow below -12 K. Our work provides direct spectroscopic evidence for the competition between magnetic order and the Kondo effect in a Kondo lattice system with local-moment antiferromagnetism, indicating a distinct scenario for the microscopic coexistence and competition of these phenomena, which might be related to the real-space modulation.