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| Main Authors: | , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| Online Access: | https://arxiv.org/abs/2604.15935 |
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| _version_ | 1866908973875068928 |
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| author | Wang, Yifan Xu, Chenchao Liu, Yi Bao, Jinke Guo, Jiayu Yang, Xiaoran Nakamura, Yuiga Fukui, Hiroshi Manjo, Taishun Ishikawa, Daisuke Baron, Alfred Q. R. Cao, Saizheng Li, Rui Li, Zilong Zhang, Yanan Chen, Ruihan Shi, Ming Yuan, Huiqiu Cao, Guanghan Cao, Chao Song, Yu |
| author_facet | Wang, Yifan Xu, Chenchao Liu, Yi Bao, Jinke Guo, Jiayu Yang, Xiaoran Nakamura, Yuiga Fukui, Hiroshi Manjo, Taishun Ishikawa, Daisuke Baron, Alfred Q. R. Cao, Saizheng Li, Rui Li, Zilong Zhang, Yanan Chen, Ruihan Shi, Ming Yuan, Huiqiu Cao, Guanghan Cao, Chao Song, Yu |
| contents | Kagome metals are prone to charge-density wave (CDW), magnetic, and superconducting phases, with their flat electronic band conducive for correlated physics. In contrast to the weakly correlated $A$V$_3$Sb$_5$ ($A$ = K, Rb, Cs) kagome metals with a $2\times2$ CDW, CsCr$_3$Sb$_5$ is a correlated metal with a flat band close to the Fermi level, and exhibits a $4\times1$ CDW intertwined with magnetic order. Under pressure, the intertwined orders are suppressed and give way to a dome of superconductivity that emerges from a non-Fermi liquid normal state. Here, we solve the crystal structure of the $4\times 1$ CDW state in CsCr$_3$Sb$_5$, and show it consists of Cr dimers separated by Cr chains. First-principles calculations show the dominant exchange interaction is antiferromagnetic within the dimers, while the intra-chain and dimer-chain couplings are much weaker. The CDW transition of CsCr$_3$Sb$_5$ is found to be more strongly first-order than those in $A$V$_3$Sb$_5$, without significant soft phonons or diffuse scattering above the CDW transition temperature. These findings suggest that fluctuating antiferromagnetic dimers may play a major role in the electron pairing of superconducting CsCr$_3$Sb$_5$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_15935 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Antiferromagnetic Dimers in the Parent Phase of a Correlated Kagome Superconductor Wang, Yifan Xu, Chenchao Liu, Yi Bao, Jinke Guo, Jiayu Yang, Xiaoran Nakamura, Yuiga Fukui, Hiroshi Manjo, Taishun Ishikawa, Daisuke Baron, Alfred Q. R. Cao, Saizheng Li, Rui Li, Zilong Zhang, Yanan Chen, Ruihan Shi, Ming Yuan, Huiqiu Cao, Guanghan Cao, Chao Song, Yu Strongly Correlated Electrons Materials Science Kagome metals are prone to charge-density wave (CDW), magnetic, and superconducting phases, with their flat electronic band conducive for correlated physics. In contrast to the weakly correlated $A$V$_3$Sb$_5$ ($A$ = K, Rb, Cs) kagome metals with a $2\times2$ CDW, CsCr$_3$Sb$_5$ is a correlated metal with a flat band close to the Fermi level, and exhibits a $4\times1$ CDW intertwined with magnetic order. Under pressure, the intertwined orders are suppressed and give way to a dome of superconductivity that emerges from a non-Fermi liquid normal state. Here, we solve the crystal structure of the $4\times 1$ CDW state in CsCr$_3$Sb$_5$, and show it consists of Cr dimers separated by Cr chains. First-principles calculations show the dominant exchange interaction is antiferromagnetic within the dimers, while the intra-chain and dimer-chain couplings are much weaker. The CDW transition of CsCr$_3$Sb$_5$ is found to be more strongly first-order than those in $A$V$_3$Sb$_5$, without significant soft phonons or diffuse scattering above the CDW transition temperature. These findings suggest that fluctuating antiferromagnetic dimers may play a major role in the electron pairing of superconducting CsCr$_3$Sb$_5$. |
| title | Antiferromagnetic Dimers in the Parent Phase of a Correlated Kagome Superconductor |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2604.15935 |