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S-Wave Superconductivity in Kagome Metal CsV₃Sb₅ Revealed by ^121/123Sb NQR and ⁵¹V NMR Measurements

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【Author】 Chao Mu;Qiangwei Yin;Zhijun Tu;Chunsheng Gong;Hechang Lei;Zheng Li;Jianlin Luo;Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences;School of Physical Sciences,University of Chinese Academy of Sciences;Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices,Renmin University of China;Songshan Lake Materials Laboratory;

【通讯作者】李政;雒建林;

【机构】 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences； School of Physical Sciences,University of Chinese Academy of Sciences； Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices,Renmin University of China； Songshan Lake Materials Laboratory；

【摘要】 We report ^121/123Sb nuclear quadrupole resonance（NQR） and ⁵¹V nuclear magnetic resonance（NMR） measurements on kagome metal CsV₃ Sb₅ with T_c=2.5 K.Both ⁵¹V NMR spectra and ^121/123Sb 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/T₁T shows a Hebel-Slichter coherence peak just below T_c,indicating that CSV₃ Sb₅ is an s-wave superconductor.更多还原

【Abstract】 We report ^121/123Sb nuclear quadrupole resonance（NQR） and ⁵¹V nuclear magnetic resonance（NMR） measurements on kagome metal CsV₃ Sb₅ with T_c=2.5 K.Both ⁵¹V NMR spectra and ^121/123Sb 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/T₁T shows a Hebel-Slichter coherence peak just below T_c,indicating that CSV₃ Sb₅ is an s-wave superconductor.更多还原

【关键词】 superconductor； coexistence； coherence； Knight； relaxation； phonon； degeneration； nontrivial； pairing； negligible；

【基金】 Supported by the National Key Research and Development Program of China (Grant Nos. 2017YFA0302901, 2018YFE0202600, and2016YFA0300504);the National Natural Science Foundation of China (Grant Nos. 11921004, 11634015, 11822412, and 11774423);the Beijing Natural Science Foundation (Grant No. Z200005);the Strategic Priority Research Program and Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (Grant No. XDB33010100)

【文献出处】 Chinese Physics Letters ,中国物理快报(英文版) , 编辑部邮箱 ,2021年07期

【分类号】O469
【被引频次】4
【下载频次】31

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S-Wave Superconductivity in Kagome Metal CsV₃Sb₅ Revealed by ^121/123Sb NQR and ⁵¹V NMR Measurements