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ID 69377
フルテキストURL
suppl.pdf 932 KB
著者
Feng, X. Y. Institute of Physics, Chinese Academy of Sciences, and BeijingNational Laboratory for CondensedMatter Physics
Zhao, Z. Institute of Physics, Chinese Academy of Sciences, and BeijingNational Laboratory for CondensedMatter Physics
Luo, J. Institute of Physics, Chinese Academy of Sciences, and BeijingNational Laboratory for CondensedMatter Physics
Zhou, Y. Z. Institute of Physics, Chinese Academy of Sciences, and BeijingNational Laboratory for CondensedMatter Physics
Yang, J. Institute of Physics, Chinese Academy of Sciences, and BeijingNational Laboratory for CondensedMatter Physics
Fang, A. F.
Yang, H. T. Institute of Physics, Chinese Academy of Sciences, and BeijingNational Laboratory for CondensedMatter Physics
Gao, H.-J. Institute of Physics, Chinese Academy of Sciences, and BeijingNational Laboratory for CondensedMatter Physics
Zhou, R. Institute of Physics, Chinese Academy of Sciences, and BeijingNational Laboratory for CondensedMatter Physics
Zheng, Guo-qing Department of Physics, Okayama University
抄録
The discovery of the kagome metal CsV3Sb5 has generated significant interest in its complex physical properties, particularly its superconducting behavior under different pressures, though its nature remains debated. Here, we performed low-temperature, high-pressure 121/123Sb nuclear quadrupole resonance (NQR) measurements to explore the superconducting pairing symmetry in CsV3Sb5. At ambient pressure, we found that the spin-lattice relaxation rate 1/T1 exhibits a kink at T ~ 0.4 Tc within the superconducting state and follows a T3 variation as temperature further decreases. This suggests the presence of two superconducting gaps with line nodes in the smaller one. As pressure increases beyond Pc ~ 1.85 GPa, where the charge-density wave phase is completely suppressed, 1/T1 shows no Hebel-Slichter peak just below Tc, and decreases rapidly, even faster than T5, indicating that the gap is fully opened for pressures above Pc. In this high pressure region, the angular dependence of the in-plane upper critical magnetic field Hc2 breaks the C6 rotational symmetry. We propose the s + id pairing at P > Pc which explains both the 1/T1 and Hc2 behaviors. Our findings indicate that CsV3Sb5 is an unconventional superconductor and its superconducting state is even more exotic at high pressures.
発行日
2025-04-17
出版物タイトル
Nature Communications
16巻
1号
出版者
Springer Science and Business Media LLC
開始ページ
3643
ISSN
2041-1723
資料タイプ
学術雑誌論文
言語
英語
OAI-PMH Set
岡山大学
著作権者
© The Author(s) 2025
論文のバージョン
publisher
PubMed ID
DOI
Web of Science KeyUT
関連URL
isVersionOf https://doi.org/10.1038/s41467-025-58941-w
ライセンス
http://creativecommons.org/licenses/by/4.0/
Citation
Feng, X.Y., Zhao, Z., Luo, J. et al. Fully-gapped superconductivity with rotational symmetry breaking in pressurized kagome metal CsV3Sb5. Nat Commun 16, 3643 (2025). https://doi.org/10.1038/s41467-025-58941-w