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S-Wave Superconductivity in Kagome Metal CsV3Sb5 Revealed by 121/123Sb NQR and 51V NMR Measurements.
- Source :
- Chinese Physics Letters; Jul2021, Vol. 38 Issue 7, p1-7, 7p
- Publication Year :
- 2021
-
Abstract
- We report <superscript>121/123</superscript>Sb nuclear quadrupole resonance (NQR) and <superscript>51</superscript>V nuclear magnetic resonance (NMR) measurements on kagome metal CsV<subscript>3</subscript>Sb<subscript>5</subscript> with T<subscript>c</subscript> = 2.5 K. Both <superscript>51</superscript>V NMR spectra and <superscript>121/123</superscript>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<subscript>1</subscript>T shows a Hebel–Slichter coherence peak just below T<subscript>c</subscript>, indicating that CsV<subscript>3</subscript>Sb<subscript>5</subscript> is an s-wave superconductor. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0256307X
- Volume :
- 38
- Issue :
- 7
- Database :
- Complementary Index
- Journal :
- Chinese Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 154862653
- Full Text :
- https://doi.org/10.1088/0256-307X/38/7/077402