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

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 

机构地区：[1]Department of Physics,Materials Genome Institute,Institute for Quantum Science and Technology,Shanghai University,Shanghai 200444,China [2]Key Laboratory of Quantum Precision Measurement of Zhejiang Province,School of Physics,Zhejiang University of Technology,Hangzhou 310023,China [3]School of Physics,Zhejiang University,Hangzhou 310027,China [4]Department of Condensed Matter Physics and Materials Science,Tata Institute of Fundamental Research,Mumbai 400005,India [5]School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China [6]ShanghaiTech Laboratory for Topological Physics,ShanghaiTech University,Shanghai 201210,China [7]Laboratory of Crystallography,University of Bayreuth,Bayreuth 95447,Germany [8]Department of Quantum Matter,AdSE,Hiroshima University,Higashi-Hiroshima 739-8530,Japan [9]P24,PETRA III,Deutsches Elektronen-Synchrotron DESY,Hamburg 22607,Germany [10]Key Laboratory for Quantum Materials of Zhejiang Province,School of Science,Westlake University,Hangzhou 310024,China [11]Department of Physics,China Jiliang University,Hangzhou 310018,China [12]Shanghai Key Laboratory of High-resolution Electron Microscopy,ShanghaiTech University,Shanghai 201210,China [13]Collaborative Innovation Centre of Advanced Microstructures,Nanjing University,Nanjing 210093,China [14]Shanghai Key Laboratory of High Temperature Superconductors,Shanghai University,Shanghai 200444,China [15]School of Physics,Hangzhou Normal University,Hangzhou 311121,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2024年第11期112-121,共10页中国科学：物理学、力学、天文学（英文版）

基　　金：the National Natural Science Foundation of China (Grant No.12204298);the National Natural Science Foundation of China (Grant No.12074242);the National Natural Science Foundation of China (Grant No.12174334);the National Natural Science Foundation of China (Grant Nos.52272265,U1932217,11974246,and 12004252);the Science and Technology Commission of Shanghai Municipality (Grant No.21JC1402600);the Zhejiang Provincial Natural Science Foundation of China (Grant No.LQ23A040009);supported by the Deutsche Forschungsgemeinschaft (DFG,German Research Foundation) (Grant No.406658237)。

摘　　要：Charge density wave(CDW) in kagome materials with the geometric frustration is able to carry unconventional characteristics.Recently, 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 

分 类 号：O469[理学—凝聚态物理]