Journal
CHINESE PHYSICS LETTERS
Volume 38, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0256-307X/38/7/077402
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Funding
- National Key Research and Development Program of China [2017YFA0302901, 2018YFE0202600, 2016YFA0300504]
- National Natural Science Foundation of China [11921004, 11634015, 11822412, 11774423]
- Beijing Natural Science Foundation [Z200005]
- Strategic Priority Research Program and Key Research Program of Frontier Sciences of the Chinese Academy of Sciences [XDB33010100]
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CsV3Sb5 exhibits s-wave superconducting behavior at low temperatures, with superconductivity emerging in the charge order state. Split V-51 NMR spectra and Sb-121/123 NQR spectra were observed after the charge density wave, indicating a commensurate CDW state.
We report Sb-121/123 nuclear quadrupole resonance (NQR) and V-51 nuclear magnetic resonance (NMR) measurements on kagome metal CsV3Sb5 with T (c) = 2.5 K. Both V-51 NMR spectra and Sb-121/123 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 CsV3Sb5 is an s-wave superconductor.
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