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Orbital ordering and fluctuations in a kagome superconductor CsV3Sb5

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Abstract

Recently, competing electronic instabilities, including superconductivity and density-wave-like order, have been discovered in vanadium-based kagome metals AV3Sb5 (A = K, Rb, Cs) with a nontrivial band topology. This finding stimulates considerable interest to study the interplay of these competing electronic orders and possible exotic excitations in the superconducting state. Here, we performed 51V and 133Cs nuclear magnetic resonance (NMR) measurements on a CsV3Sb5 single crystal to clarify the nature of density-wave-like transition in these kagome superconductors. A first-order structural transition is unambiguously revealed below Ts ∼ 94 K by observing the sudden splitting of Knight shift in 51V NMR spectrum. Moreover, combined with 133Cs NMR spectrum, the present result confirms a three-dimensional structural modulation. By further analyzing the anisotropy of Knight shift and 1/T1T at 51V nuclei, we proposed that the orbital order is the primary electronic order induced by the first-order structural transition, which is supported by further analysis on electric field gradient at 51V nuclei. In addition, the evidence for possible orbital fluctuations is also revealed above Ts. The present work sheds light on a rich orbital physics in kagome superconductors AV3Sb5.

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  1. These authors contributed equally to this work.

Authors and Affiliations

  1. Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, China

    DianWu Song, LiXuan Zheng, FangHang Yu, Jian Li, LinPeng Nie, Min Shan, Dan Zhao, ShunJiao Li, BaoLei Kang, ZhiMian Wu, YanBing Zhou, KuangLv Sun, Kai Liu, XiGang Luo, Tao Wu & XianHui Chen

  2. CAS Key Laboratory of Strongly-coupled Quantum Matter Physics, Department of Physics, University of Science and Technology of China, Hefei, 230026, China

    XiGang Luo, ZhenYu Wang, JianJun Ying, Tao Wu & XianHui Chen

  3. National Laboratory of Solid State Microstructures and School of Physics, Nanjing University, Nanjing, 210093, China

    XianGang Wan

  4. CAS Center for Excellence in Superconducting Electronics (CENSE), Shanghai, 200050, China

    Tao Wu & XianHui Chen

  5. CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei, 230026, China

    XianHui Chen

  6. Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China

    XianGang Wan, Tao Wu & XianHui Chen

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  1. DianWu Song
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  2. LiXuan Zheng
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  18. Tao Wu
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Corresponding authors

Correspondence to Tao Wu or XianHui Chen.

Additional information

This work was supported by the National Key R&D Program of China (Grant Nos. 2017YFA0303000, and 2016YFA0300201), the National Natural Science Foundation of China (Grant Nos. 11888101, and 12034004), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB25000000), the Anhui Initiative in Quantum Information Technologies (Grant No. AHY160000), and the Collaborative Innovation Program of Hefei Science Center, CAS (Grant No. 2019HSCCIP007). We thank the valuable discussion with YiLin Wang, Gang Chen, and JunFeng He.

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Song, D., Zheng, L., Yu, F. et al. Orbital ordering and fluctuations in a kagome superconductor CsV3Sb5. Sci. China Phys. Mech. Astron. 65, 247462 (2022). https://doi.org/10.1007/s11433-021-1826-1

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