Charge density wave with suppressed long-range structural modulation in canted antiferromagnetic kagome FeGe
Abstract
Kagome lattice can host abundant exotic quantum states such as superconductivity and charge density wave (CDW). Recently, successive orders of A-type antiferromagnetism (AFM), CDW and canted AFM have been manifested upon cooling in kagome FeGe. However, the mechanism of CDW and interaction with magnetism remains unclear. Here we investigate the evolution of CDW with temperature across the canted AFM by single-crystal x-ray diffraction, scanning tunneling microscope (STM) and resonant elastic x-ray scattering (REXS). Interestingly, CDW-induced superlattice reflections become weak after the canted AFM, although long-range CDW order is still detectable by STM and REXS. We uncover a novel long-range CDW order with suppressed structural modulation, likely due to the competition for the underlying crystal structure between CDW and canted AFM. Additionally, occupational modulations of Ge1 in the kagome plane and displacive modulations of all atoms were extracted. The results confirm Ge dimerization along the c axis and suggest a dynamic transformation between different CDW domains.
Cite
@article{arxiv.2404.00996,
title = {Charge density wave with suppressed long-range structural modulation in canted antiferromagnetic kagome FeGe},
author = {Chenfei Shi and Wenchang Hou and Hanbin Deng and Bikash Patra and Surya Rohith Kotla and Yi Liu and Sitaram Ramakrishnan and Claudio Eisele and Harshit Agarwal and Leila Noohinejad and Ji-Yong Liu and Tianyu Yang and Guowei Liu and Bishal Baran Maity and Qi Wang and Zhaodi Lin and Baojuan Kang and Wanting Yang and Yongchang Li and Zhihua Yang and Yuxiang Chen and Xiang Li and Yuke Li and Yanpeng Qi and Arumugam Thamizhavel and Wei Ren and Guang-Han Cao and Jia-Xin Yin and Bahadur Singh and Xuerong Liu and Sander van Smaalen and Shixun Cao and Jin-Ke Bao},
journal= {arXiv preprint arXiv:2404.00996},
year = {2025}
}
Comments
27 pages, 7 figures. Comments on the manuscript are welcome. Supporting information can be provided upon request