S-Wave Superconductivity in Kagome Metal CsV$_{3}$Sb$_{5}$ Revealed by <cblk>$^{121/123}$Sb</cblk> NQR and <cblk>$^{51}$V</cblk> NMR Measurements

doi:10.1088/0256-307X/38/7/077402

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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.

收稿日期: 2021-06-09 出版日期: 2021-06-30

:	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)

引用本文:

. [J]. 中国物理快报, 2021, 38(7): 77402-077402.
Chao Mu, Qiangwei Yin, Zhijun Tu, Chunsheng Gong, Hechang Lei, Zheng Li, and Jianlin Luo. S-Wave Superconductivity in Kagome Metal CsV$_{3}$Sb$_{5}$ Revealed by $^{121/123}$Sb NQR and $^{51}$V NMR Measurements. Chin. Phys. Lett., 2021, 38(7): 77402-077402.

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https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/38/7/077402 或 https://cpl.iphy.ac.cn/CN/Y2021/V38/I7/77402

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