Charge density wave without long-range structural modulation in canted antiferromagnetic kagome FeGe

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 frustr...

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Published inarXiv.org
Main Authors Shi, Chenfei, Deng, Hanbin, Kotla, Surya Rohith, Liu, Yi, Ramakrishnan, Sitaram, Eisele, Claudio, Agarwal, Harshit, Noohinejad, Leila, Ji-Yong, Liu, Yang, Tianyu, Liu, Guowei, Bishal Baran Maity, Wang, Qi, Lin, Zhaodi, Kang, Baojuan, Yang, Wanting, Li, Yongchang, Yang, Zhihua, Li, Yuke, Qi, Yanpeng, Arumugam Thamizhavel, Ren, Wei, Guang-Han Cao, Jia-Xin, Yin, Sander van Smaalen, Cao, Shixun, Jin-Ke, Bao
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 01.04.2024
Subjects
Antiferromagnetism
Charge density waves
Crystal structure
Dimerization
Filing
Frustrated magnetism
Kagome lattice
Long range order
Modulation
Single crystals
Superconductivity
Superlattices
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Summary: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), \(2\times2\times2\) 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 \(2\times2\) CDW in the \(ab\) plane persists as a long-range order demonstrated by strong electronic modulation in the d\(I\)/d\(V\) 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.
ISSN:2331-8422