Discovery of a long-ranged charge order with 1/4 Ge1-dimerization in an antiferromagnetic Kagome metal

Ziyuan Chen, Xueliang Wu, Shiming Zhou, Jiakang Zhang, Ruotong Yin, Yuanji Li, Mingzhe Li, Jiashuo Gong, Mingquan He, Yisheng Chai, Xiaoyuan Zhou, Yilin Wang, Aifeng Wang (), Ya-Jun Yan () and Dong-Lai Feng ()
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Ziyuan Chen: University of Science and Technology of China
Xueliang Wu: Chongqing University
Shiming Zhou: University of Science and Technology of China
Jiakang Zhang: University of Science and Technology of China
Ruotong Yin: University of Science and Technology of China
Yuanji Li: University of Science and Technology of China
Mingzhe Li: University of Science and Technology of China
Jiashuo Gong: University of Science and Technology of China
Mingquan He: Chongqing University
Yisheng Chai: Chongqing University
Xiaoyuan Zhou: Chongqing University
Yilin Wang: University of Science and Technology of China
Aifeng Wang: Chongqing University
Ya-Jun Yan: University of Science and Technology of China
Dong-Lai Feng: University of Science and Technology of China

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Exotic quantum states arise from the interplay of various degrees of freedom such as charge, spin, orbital, and lattice. Recently, a short-ranged charge order (CO) was discovered deep inside the antiferromagnetic phase of Kagome magnet FeGe, exhibiting close relationships with magnetism. Despite extensive investigations, the CO mechanism remains controversial, mainly because the short-ranged behavior hinders precise identification of CO superstructure. Here, combining multiple experimental techniques, we report the observation of a long-ranged CO in high-quality FeGe samples, which is accompanied with a first-order structural transition. With these high-quality samples, the distorted 2 × 2 × 2 CO superstructure is characterized by a strong dimerization along the c-axis of 1/4 of Ge1-sites in Fe3Ge layers, and in response to that, the 2 × 2 in-plane charge modulations are induced. Moreover, we show that the previously reported short-ranged CO might be related to large occupational disorders at Ge1-site, which upsets the equilibrium of the CO state and the ideal 1 × 1 × 1 structure with very close energies, inducing nanoscale coexistence of these two phases. Our study provides important clues for further understanding the CO properties in FeGe and helps to identify the CO mechanism.

Date: 2024
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DOI: 10.1038/s41467-024-50661-x

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