Emergent dynamical Kondo coherence and competing magnetic order in a correlated kagome flat-band metal CsCr6Sb6
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912532947533824 |
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| author | Liu, Xiangqi Zhang, Xuefeng Jiao, Jiachen Zhang, Renjie Chen, Kaiwen Wang, Ying Ye, Yunguan Yu, Zhenhai Jiang, Chengyu Wang, Xia Shu, Lei Lv, Baiqing Li, Gang Guo, Yanfeng |
| author_facet | Liu, Xiangqi Zhang, Xuefeng Jiao, Jiachen Zhang, Renjie Chen, Kaiwen Wang, Ying Ye, Yunguan Yu, Zhenhai Jiang, Chengyu Wang, Xia Shu, Lei Lv, Baiqing Li, Gang Guo, Yanfeng |
| contents | Correlated kagome metals host unique electronic states that enable exotic quantum phenomena. In the recently emerged CsCr6Sb6, these manifest through Kondo behavior from localized Cr-3d electrons and unprecedented band flattening near the Fermi level. Yet the intricate interplay among Kondo screening, magnetic frustration, and electronic correlations remains poorly understood-a fundamental gap we address through multifaceted experimental and theoretical approaches. Our angle-resolved photoemission spectroscopy measurements reveal electronic correlation-renormalized flat bands and muon spin relaxation study detect short-range magnetic order at TN ~ 80 K. Complementing these findings, density-functional theory and dynamical mean-field theory calculations identify a coherent-incoherent crossover at TN, with a remarkable restoration of coherence accompanying local moment suppression-an anomalous hallmark of Kondo behavior. Intriguingly, despite strong interlayer antiferromagnetic coupling, the system evades long-range magnetic order due to competing magnetic configurations separated by sub-meV energy differences. These insights establish CsCr6Sb6 as a prototypical platform for investigating dynamical Kondo screening in correlated flat-band systems, opening new avenues to study flat band physics and frustrated magnetism in correlated kagome lattices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_08580 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Emergent dynamical Kondo coherence and competing magnetic order in a correlated kagome flat-band metal CsCr6Sb6 Liu, Xiangqi Zhang, Xuefeng Jiao, Jiachen Zhang, Renjie Chen, Kaiwen Wang, Ying Ye, Yunguan Yu, Zhenhai Jiang, Chengyu Wang, Xia Shu, Lei Lv, Baiqing Li, Gang Guo, Yanfeng Strongly Correlated Electrons Correlated kagome metals host unique electronic states that enable exotic quantum phenomena. In the recently emerged CsCr6Sb6, these manifest through Kondo behavior from localized Cr-3d electrons and unprecedented band flattening near the Fermi level. Yet the intricate interplay among Kondo screening, magnetic frustration, and electronic correlations remains poorly understood-a fundamental gap we address through multifaceted experimental and theoretical approaches. Our angle-resolved photoemission spectroscopy measurements reveal electronic correlation-renormalized flat bands and muon spin relaxation study detect short-range magnetic order at TN ~ 80 K. Complementing these findings, density-functional theory and dynamical mean-field theory calculations identify a coherent-incoherent crossover at TN, with a remarkable restoration of coherence accompanying local moment suppression-an anomalous hallmark of Kondo behavior. Intriguingly, despite strong interlayer antiferromagnetic coupling, the system evades long-range magnetic order due to competing magnetic configurations separated by sub-meV energy differences. These insights establish CsCr6Sb6 as a prototypical platform for investigating dynamical Kondo screening in correlated flat-band systems, opening new avenues to study flat band physics and frustrated magnetism in correlated kagome lattices. |
| title | Emergent dynamical Kondo coherence and competing magnetic order in a correlated kagome flat-band metal CsCr6Sb6 |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2508.08580 |