Charge density wave with suppressed long-range structural modulation in canted antiferromagnetic kagome FeGe

Chenfei Shi; Wenchang Hou; Hanbin Deng; Bikash Patra; Surya Rohith Kotla; Yi Liu; Sitaram Ramakrishnan; Claudio Eisele; Harshit Agarwal; Leila Noohinejad; Ji-Yong Liu; Tianyu Yang; Guowei Liu; Bishal Baran Maity; Qi Wang; Zhaodi Lin; Baojuan Kang; Wanting Yang; Yongchang Li; Zhihua Yang; Yuxiang Chen; Xiang Li; Yuke Li; Yanpeng Qi; Arumugam Thamizhavel; Wei Ren; Guang-Han Cao; Jia-Xin Yin; Bahadur Singh; Xuerong Liu; Sander van Smaalen; Shixun Cao; Jin-Ke Bao

arXiv · 2404.00996

Charge density wave with suppressed long-range structural modulation in canted antiferromagnetic kagome FeGe

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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.

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Chenfei Shi, Wenchang Hou, Hanbin Deng, Bikash Patra, Surya Rohith Kotla, Yi Liu, Sitaram Ramakrishnan, Claudio Eisele, Harshit Agarwal, Leila Noohinejad, Ji-Yong Liu, Tianyu Yang, Guowei Liu, Bishal Baran Maity, Qi Wang, Zhaodi Lin, Baojuan Kang, Wanting Yang, Yongchang Li, Zhihua Yang, Yuxiang Chen, Xiang Li, Yuke Li, Yanpeng Qi, Arumugam Thamizhavel, Wei Ren, Guang-Han Cao, Jia-Xin Yin, Bahadur Singh, Xuerong Liu, Sander van Smaalen, Shixun Cao, Jin-Ke Bao. 2024-04-01. Charge density wave with suppressed long-range structural modulation in canted antiferromagnetic kagome FeGe. https://arxiv.org/abs/2404.00996

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