Highly tunable Kondo effect with competing magnetism in the kagome lattice compound <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msub><mi>CsCr</mi><mn>6</mn></msub><msub><mi>Sb</mi><mn>6</mn></msub></mrow></math>

Guofei Yang; Hengrui Gui; Boqin Song; Huiqing Ye; Yifan Wan; Guoqing Zeng; Chengwei Wang; Xudong Zhao; Zekai Shi; Michael Smidman; Chenchao Xu; Chao Cao; Tianping Ying; Lin Jiao; Huiqiu Yuan

doi:10.1103/618x-hmhg

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Highly tunable Kondo effect with competing magnetism in the kagome lattice compound ${CsCr}_{6} {Sb}_{6}$

Guofei Yang ^1,*, Hengrui Gui^1,*, Boqin Song ^2,*, Huiqing Ye^1,3, Yifan Wan¹, Guoqing Zeng ¹, Chengwei Wang¹, Xudong Zhao ¹, Zekai Shi ¹ et al.

Michael Smidman¹, Chenchao Xu ³, Chao Cao¹, Tianping Ying^2,†, Lin Jiao ^1,‡, and Huiqiu Yuan^1,4,5,6,§

¹Center for Correlated Matter and School of Physics, Zhejiang University, Hangzhou 310058, China
²Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
³School of Physics, Hangzhou Normal University, Hangzhou 310036, China
⁴Institute for Advanced Study in Physics, Zhejiang University, Hangzhou 310058, China
⁵Institute of Fundamental and Transdisciplinary Research, Zhejiang University, Hangzhou 310058, China
⁶State Key Laboratory of Silicon and Advanced Semiconductor Materials, Zhejiang University, Hangzhou 310058, China

^*These authors contributed equally to this work.
^†Contact author: ying@iphy.ac.cn
^‡Contact author: lin.jiao@zju.edu.cn
^§Contact author: hqyuan@zju.edu.cn

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Phys. Rev. B 113, 155128 – Published 14 April, 2026

DOI: https://doi.org/10.1103/618x-hmhg

Abstract

Electronic correlations arising from frustration-induced flat band systems exhibit rich physical phenomena, offering a new pathway to realize Kondo physics without $f$ -electrons. Here we study a kagome lattice compound ${CsCr}_{6} {Sb}_{6}$ , using scanning tunneling spectroscopy and thermodynamic probes. Atomic-scale spectroscopy measurements reveal the signature of a Fano resonance near the Fermi level, indicating the development of the Kondo effect at low temperature. More interestingly, a change of rotational symmetry within the kagome plane is observed by applying an in-plane magnetic field, which likely arises from competition between the Kondo effect and frustrated magnetism. Such highly tunable correlated states are rarely observed in other systems, and therefore the ${CsCr}_{6} {Sb}_{6}$ provides a ideal platform to study the interplay of Kondo effect, magnetism and geometric frustration.

Physical Review B

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Highly tunable Kondo effect with competing magnetism in the kagome lattice compound ${CsCr}_{6} {Sb}_{6}$

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Highly tunable Kondo effect with competing magnetism in the kagome lattice compound CsCr6Sb6

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Highly tunable Kondo effect with competing magnetism in the kagome lattice compound ${CsCr}_{6} {Sb}_{6}$