Chin. Phys. Lett.  2021, Vol. 38 Issue (7): 077402    DOI: 10.1088/0256-307X/38/7/077402
S-Wave Superconductivity in Kagome Metal CsV$_{3}$Sb$_{5}$ Revealed by $^{121/123}$Sb NQR and $^{51}$V NMR Measurements
Chao Mu1,2, Qiangwei Yin3, Zhijun Tu3, Chunsheng Gong3, Hechang Lei3, Zheng Li1,2*, and Jianlin Luo1,2,4*
1Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
3Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China
4Songshan Lake Materials Laboratory, Dongguan 523808, China
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Chao Mu, Qiangwei Yin, Zhijun Tu et al  2021 Chin. Phys. Lett. 38 077402
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Abstract We report $^{121/123}$Sb nuclear quadrupole resonance (NQR) and $^{51}$V nuclear magnetic resonance (NMR) measurements on kagome metal CsV$_3$Sb$_5$ with $T_{\rm c}=2.5$ K. Both $^{51}$V NMR spectra and $^{121/123}$Sb NQR spectra split after a charge density wave (CDW) transition, 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. At low temperature, electric-field-gradient fluctuations diminish and magnetic fluctuations become dominant. Superconductivity emerges in the charge order state. Knight shift decreases and $1/T_{1}T$ shows a Hebel–Slichter coherence peak just below $T_{\rm c}$, indicating that CsV$_3$Sb$_5$ is an s-wave superconductor.
Received: 09 June 2021      Published: 30 June 2021
PACS:  74.25.nj (Nuclear magnetic resonance)  
  71.45.Lr (Charge-density-wave systems)  
  76.60.Gv (Quadrupole resonance)  
  76.60.-k (Nuclear magnetic resonance and relaxation)  
Fund: Supported by the National Key Research and Development Program of China (Grant Nos. 2017YFA0302901, 2018YFE0202600, and 2016YFA0300504), the National Natural Science Foundation of China (Grant Nos. 11921004, 11634015, 11822412, and 11774423), the Beijing Natural Science Foundation (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).
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Chao Mu
Qiangwei Yin
Zhijun Tu
Chunsheng Gong
Hechang Lei
Zheng Li
and Jianlin Luo
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