Charge density wave without long-range structural modulation in canted antiferromagnetic kagome FeGe
2024-04-01
状态已发表
摘要

Strongly correlated electron systems with a kagome lattice can host abundant exotic quantum states such as superconductivity and spin/charge density waves (CDW) due to the complicated interactions between different degrees of freedoms in the framework of a unique two-dimensional geometrically frustrated lattice structure. Recently, successive orders of A -type antiferromagnetism (AFM), 2 × 2 × 2 CDW and canted double -cone AFM have been manifested upon cooling in magnetic kagome FeGe. However, the mechanism of the CDW order and its interaction with magnetism are presently enigmatic at best. Here we investigate the evolution of CDW order with temperature across the spin canting transition in FeGe by single -crystal x-ray diffraction. Refinements of its modulated structure are presented using the superspace approach. Interestingly, the superlattice reflections originating from CDW-induced long-range structural modulation become extremely weak after the system enters the canted AFM while a 2  2 CDW in the ab plane persists as a long-range order demonstrated by strong electronic modulation in the dI/dV map of scanning tunneling spectroscopy. We discovered a novel CDW order without long-range structural modulation in FeGe probably because of the competition between CDW and canted AFM in determining the underlying crystal structure. In addition, occupational modulations of Ge1 atoms located in the kagome plane and displacive modulations of all the atoms were extracted from the refinements, confirming the existence of Ge atom dimerization along the c axis as the major distortion and indicating a dynamic transformation between different CDW domains.

DOIarXiv:2404.00996
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出处Arxiv
WOS记录号PPRN:88365965
WOS类目Physics, Condensed Matter
资助项目National Natural Science Foundation of China[
文献类型预印本
条目标识符https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/372917
专题物质科学与技术学院
物质科学与技术学院_PI研究组_齐彦鹏组
物质科学与技术学院_公共科研平台_拓扑物理实验室
通讯作者Van Smaalen, Sander; Cao, Shixun; Bao, Jin-Ke
作者单位
1.Shanghai Univ, Mat Genome Inst, Dept Phys, Shanghai 200444, Peoples R China
2.Shanghai Univ, Int Ctr Quantum & Mol Struct, Shanghai 200444, Peoples R China
3.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Guangdong, Peoples R China
4.Univ Bayreuth, Lab Crystallog, D-95447 Bayreuth, Germany
5.Zhejiang Univ Technol, Dept Appl Phys, Hangzhou 310023, Peoples R China
6.Zhejiang Univ, Sch Phys, Zhejiang Prov Key Lab Quantum Technol & Devices, Hangzhou 310027, Peoples R China
7.Hiroshima Univ, Dept Quantum Matter, AdSE, Higashi Hiroshima 7398530, Japan
8.Deutsch Elektronen Synchrotron DESY, PETRA III, P24, Notkestr 85, D-22607 Hamburg, Germany
9.Zhejiang Univ, Dept Chem, Hangzhou 310058, Peoples R China
10.Tata Inst Fundamental Res, Dept Condensed Matter Phys & Mat Sci, Homi Bhabha Rd, Mumbai 400005, India
11.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China
12.ShanghaiTech Univ, ShanghaiTech Lab Topol Phys, Shanghai 201210, Peoples R China
13.Hangzhou Normal Univ, Sch Phys, Hangzhou 311121, Peoples R China
14.Hangzhou Normal Univ, Hangzhou Key Lab Quantum Matters, Hangzhou 311121, Peoples R China
15.ShanghaiTech Univ, Shanghai Key Lab High resolut Electron Microscopy, Shanghai 201210, Peoples R China
16.Shanghai Univ, Peoples Republic China Shanghai Key Lab High Temp Supercond, Shanghai 200444, Peoples R China
17.Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Peoples R China
推荐引用方式
GB/T 7714
Shi, Chenfei,Deng, Hanbin,Kotla, Surya Rohith,et al. Charge density wave without long-range structural modulation in canted antiferromagnetic kagome FeGe. 2024.
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