中国物理B ›› 2022, Vol. 31 ›› Issue (1): 17105-017105.doi: 10.1088/1674-1056/ac422c

所属专题: SPECIAL TOPIC — Superconductivity in vanadium-based kagome materials

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Tri-hexagonal charge order in kagome metal CsV3Sb5 revealed by 121Sb nuclear quadrupole resonance

Chao Mu(牟超)1,2, Qiangwei Yin(殷蔷薇)3, Zhijun Tu(涂志俊)3, Chunsheng Gong(龚春生)3, Ping Zheng(郑萍)1, Hechang Lei(雷和畅)3,†, Zheng Li(李政)1,2,‡, and Jianlin Luo(雒建林)1,2,4   

  1. 1 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China;
    3 Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices, Renmin University of China, Beijing 100872, China;
    4 Songshan Lake Materials Laboratory, Dongguan 523808, China
  • 收稿日期:2021-10-25 修回日期:2021-12-09 接受日期:2021-12-11 出版日期:2021-12-03 发布日期:2021-12-30
  • 通讯作者: Hechang Lei, Zheng Li E-mail:hlei@ruc.edu.cn;lizheng@iphy.ac.cn
  • 基金资助:
    Project supported by the National Key Research and Development Program of China (Grant Nos. 2017YFA0302901, 2018YFA0305702, 2018YFE0202600, and 2016YFA0300504), the National Natural Science Foundation of China (Grant Nos. 12134018, 11921004, 11822412, and 11774423), the Beijing Natural Science Foundation, China (Grant No. Z200005), and the Strategic Priority Research Program and Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (Grant No. XDB33010100).

Tri-hexagonal charge order in kagome metal CsV3Sb5 revealed by 121Sb nuclear quadrupole resonance

Chao Mu(牟超)1,2, Qiangwei Yin(殷蔷薇)3, Zhijun Tu(涂志俊)3, Chunsheng Gong(龚春生)3, Ping Zheng(郑萍)1, Hechang Lei(雷和畅)3,†, Zheng Li(李政)1,2,‡, and Jianlin Luo(雒建林)1,2,4   

  1. 1 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China;
    3 Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices, Renmin University of China, Beijing 100872, China;
    4 Songshan Lake Materials Laboratory, Dongguan 523808, China
  • Received:2021-10-25 Revised:2021-12-09 Accepted:2021-12-11 Online:2021-12-03 Published:2021-12-30
  • Contact: Hechang Lei, Zheng Li E-mail:hlei@ruc.edu.cn;lizheng@iphy.ac.cn
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant Nos. 2017YFA0302901, 2018YFA0305702, 2018YFE0202600, and 2016YFA0300504), the National Natural Science Foundation of China (Grant Nos. 12134018, 11921004, 11822412, and 11774423), the Beijing Natural Science Foundation, China (Grant No. Z200005), and the Strategic Priority Research Program and Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (Grant No. XDB33010100).

摘要: We report 121Sb nuclear quadrupole resonance (NQR) measurements on kagome superconductor CsV3Sb5 with Tc=2.5 K. 121Sb NQR spectra split after a charge density wave (CDW) transition at 94 K, which demonstrates a commensurate CDW state. The coexistence of the high temperature phase and the CDW phase between 91 K and 94 K manifests that it is a first order phase transition. The CDW order exhibits tri-hexagonal deformation with a lateral shift between the adjacent kagome layers, which is consistent with 2×2×2 superlattice modulation. The superconducting state coexists with CDW order and shows a conventional s-wave behavior in the bulk state.

关键词: charge-density-wave systems, nuclear magnetic resonance

Abstract: We report 121Sb nuclear quadrupole resonance (NQR) measurements on kagome superconductor CsV3Sb5 with Tc=2.5 K. 121Sb NQR spectra split after a charge density wave (CDW) transition at 94 K, which demonstrates a commensurate CDW state. The coexistence of the high temperature phase and the CDW phase between 91 K and 94 K manifests that it is a first order phase transition. The CDW order exhibits tri-hexagonal deformation with a lateral shift between the adjacent kagome layers, which is consistent with 2×2×2 superlattice modulation. The superconducting state coexists with CDW order and shows a conventional s-wave behavior in the bulk state.

Key words: charge-density-wave systems, nuclear magnetic resonance

中图分类号:  (Nuclear magnetic resonance)

  • 74.25.nj
71.45.Lr (Charge-density-wave systems) 76.60.Gv (Quadrupole resonance) 76.60.-k (Nuclear magnetic resonance and relaxation)