S-Wave Superconductivity in Kagome Metal CsV_(3)Sb_(5) Revealed by ^(121/123)Sb NQR and ^(51)V NMR Measurements  

作　　者：Chao Mu Qiangwei Yin Zhijun Tu Chunsheng Gong Hechang Lei Zheng Li Jianlin Luo 牟超;殷蔷薇;涂志俊;龚春生;雷和畅;李政;雒建林(Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China;Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices,Renmin University of China,Beijing 100872,China;Songshan Lake Materials Laboratory,Dongguan 523808,China)

机构地区：[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

出　　处：《Chinese Physics Letters》2021年第7期140-144,共5页中国物理快报（英文版）

基　　金：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);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 ^(121/123)Sb nuclear quadrupole resonance(NQR)and ^(51)V nuclear magnetic resonance(NMR)measurements on kagome metal CsV_(3)Sb_(5) with T_(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_(c),indicating that CsV_(3)Sb_(5) is an s-wave superconductor.

关 键 词：transition state NMR 

分 类 号：O469[理学—凝聚态物理]