Electron correlation and incipient flat bands in the Kagome superconductor CsCr3Sb5

Yidian Li, Yi Liu, Xian Du, Siqi Wu, Wenxuan Zhao, Kaiyi Zhai, Yinqi Hu, Senyao Zhang, Houke Chen, Jieyi Liu, Yiheng Yang, Cheng Peng, Makoto Hashimoto, Donghui Lu, Zhongkai Liu, Yilin Wang (), Yulin Chen (), Guanghan Cao () and Lexian Yang ()
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Yidian Li: Tsinghua University
Yi Liu: Zhejiang University
Xian Du: Tsinghua University
Siqi Wu: Zhejiang University
Wenxuan Zhao: Tsinghua University
Kaiyi Zhai: Tsinghua University
Yinqi Hu: Tsinghua University
Senyao Zhang: Tsinghua University
Houke Chen: University of Oxford
Jieyi Liu: University of Oxford
Yiheng Yang: University of Oxford
Cheng Peng: University of Oxford
Makoto Hashimoto: SLAC National Accelerator Laboratory
Donghui Lu: SLAC National Accelerator Laboratory
Zhongkai Liu: ShanghaiTech University and CAS-Shanghai Science Research Center
Yilin Wang: University of Science and Technology of China
Yulin Chen: University of Oxford
Guanghan Cao: Zhejiang University
Lexian Yang: Tsinghua University

Nature Communications, 2025, vol. 16, issue 1, 1-8

Abstract: Abstract Correlated kagome materials exhibit a compelling interplay between lattice geometry, electron correlation, and topology. In particular, the flat bands near the Fermi level provide a fertile playground for novel many-body states. Here we investigate the electronic structure of CsCr3Sb5 using high-resolution angle-resolved photoemission spectroscopy and ab-initio calculations. Our results suggest that Cr 3d electrons are intrinsically incoherent, showing strong electron correlation amplified by Hund’s coupling. Notably, we identify incipient flat bands close to the Fermi level, which are expected to significantly influence the electronic properties of the system. Across the density-wave-like transition at 55 K, we observe a drastic enhancement of the electron scattering rate, which aligns with the semiconducting-like property at high temperatures. These findings establish CsCr3Sb5 as a strongly correlated Hund’s metal with incipient flat bands near the Fermi level, which provides an electronic basis for understanding its novel properties compared to the weakly correlated AV3Sb5.

Date: 2025
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DOI: 10.1038/s41467-025-58487-x

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