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Annealing-induced long-range charge density wave order in magnetic kagome FeGe:Fluctuations and disordered structure

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Science China(Physics,Mechanics & Astronomy) 2024年第11期67卷 112-121页

作者： Chenfei Shi Yi Liu Bishal Baran Maity Qi Wang Surya Rohith Kotla Sitaram Ramakrishnan claudio eisele Harshit Agarwal Leila Noohinejad Qian Tao Baojuan Kang Zhefeng Lou Xiaohui Yang Yanpeng Qi Xiao Lin Zhu-An Xu Arumugam Thamizhavel Guang-Han Cao Sander Van Smaalen Shixun Cao Jin-Ke Bao Department of Physics Materials Genome InstituteInstitute for Quantum Science and TechnologyShanghai UniversityShanghai 200444China Key Laboratory of Quantum Precision Measurement of Zhejiang Province School of PhysicsZhejiang University of TechnologyHangzhou 310023China School of Physics Zhejiang UniversityHangzhou 310027China Department of Condensed Matter Physics and Materials Science Tata Institute of Fundamental ResearchMumbai 400005India School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China ShanghaiTech Laboratory for Topological Physics ShanghaiTech UniversityShanghai 201210China Laboratory of Crystallography University of BayreuthBayreuth 95447Germany Department of Quantum Matter AdSEHiroshima UniversityHigashi-Hiroshima 739-8530Japan P24 PETRA IIIDeutsches Elektronen-Synchrotron DESYHamburg 22607Germany Key Laboratory for Quantum Materials of Zhejiang Province School of ScienceWestlake UniversityHangzhou 310024China Department of Physics China Jiliang UniversityHangzhou 310018China Shanghai Key Laboratory of High-resolution Electron Microscopy ShanghaiTech UniversityShanghai 201210China Collaborative Innovation Centre of Advanced Microstructures Nanjing UniversityNanjing 210093China Shanghai Key Laboratory of High Temperature Superconductors Shanghai UniversityShanghai 200444China School of Physics Hangzhou Normal UniversityHangzhou 311121China

Charge density wave(CDW) in kagome materials with the geometric frustration is able to carry unconventional ***, a CDW has been observed below the antiferromagnetic order in kagome FeGe, in which magnetism and CDW are intertwined to form an emergent quantum ground state. However, the CDW is only short-ranged and the structural modulation originating from it has yet to be determined experimentally. Here we realize a long-range CDW order by post-annealing process,and resolve the structure model through single crystal X-ray diffraction. Occupational disorder of Ge resulting from short-range CDW correlations above T_(CDW) is identified from structure refinements. The partial dimerization of Ge along the c axis is unveiled to be the dominant distortion for the CDW. Occupational disorder of Ge is also proved to exist in the CDW phase due to the random selection of partially dimerized Ge sites. Our work provides useful insights for understanding the unconventional nature of the CDW in FeGe.

关键词： charge density wave kagome disordered structure fluctuations

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