Photoemission signature of the competition between magnetic order and Kondo effect in <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>CeCoGe</mi><mn>3</mn></msub></math>

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

doi:10.1103/PhysRevB.107.L201104

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Photoemission signature of the competition between magnetic order and Kondo effect in ${CeCoGe}_{3}$

Peng Li¹, Huiqing Ye¹, Yong Hu ², Yuan Fang¹, Zhiguang Xiao¹, Zhongzheng Wu¹, Zhaoyang Shan¹, Ravi P. Singh ³, Geetha Balakrishnan ⁴ et al.

Dawei Shen⁵, Yi-feng Yang⁶, Chao Cao¹, Nicholas C. Plumb ², Michael Smidman^1,*, Ming Shi², Johann Kroha ⁷, Huiqiu Yuan^1,8,9,†, Frank Steglich^1,10, and Yang Liu ^1,8,‡

¹Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310058, China
²Paul Scherrer Institute, Swiss Light Source, CH-5232 Villigen PSI, Switzerland
³Department of Physics, Indian Institute of Science Education and Research Bhopal, Bhopal 462066, India
⁴Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom
⁵National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China
⁶Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Science, Beijing 100190, China
⁷Physikalisches Institut, Universität Bonn, Nussallee 12, 53115 Bonn, Germany
⁸Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, China
⁹State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310058, China
¹⁰Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany

^*msmidman@zju.edu.cn
^†hqyuan@zju.edu.cn
^‡yangliuphys@zju.edu.cn

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Phys. Rev. B 107, L201104 – Published 4 May, 2023

DOI: https://doi.org/10.1103/PhysRevB.107.L201104

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 ${CeCoGe}_{3}$ with a high $T_{N 1}$ 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 $\sim 25$ K, just above $T_{N 1}$ , and eventually ceases to grow below $\sim 12$ 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.

Physical Review B

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Photoemission signature of the competition between magnetic order and Kondo effect in ${CeCoGe}_{3}$

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

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Photoemission signature of the competition between magnetic order and Kondo effect in ${CeCoGe}_{3}$