Fully-gapped superconductivity with rotational symmetry breaking in pressurized kagome metal CsV3Sb5
Abstract 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 quadru...
Saved in:
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-04-01
|
| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-025-58941-w |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849699617086636032 |
|---|---|
| author | X. Y. Feng Z. Zhao J. Luo Y. Z. Zhou J. Yang A. F. Fang H. T. Yang H.-J. Gao R. Zhou Guo-qing Zheng |
| author_facet | X. Y. Feng Z. Zhao J. Luo Y. Z. Zhou J. Yang A. F. Fang H. T. Yang H.-J. Gao R. Zhou Guo-qing Zheng |
| author_sort | X. Y. Feng |
| collection | DOAJ |
| description | Abstract 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/T 1 exhibits a kink at T ~ 0.4 T c within the superconducting state and follows a T 3 variation as temperature further decreases. This suggests the presence of two superconducting gaps with line nodes in the smaller one. As pressure increases beyond P c ~ 1.85 GPa, where the charge-density wave phase is completely suppressed, 1/T 1 shows no Hebel-Slichter peak just below T c, and decreases rapidly, even faster than T 5, indicating that the gap is fully opened for pressures above P c. In this high pressure region, the angular dependence of the in-plane upper critical magnetic field H c2 breaks the C 6 rotational symmetry. We propose the s + i d pairing at P > P c which explains both the 1/T 1 and H c2 behaviors. Our findings indicate that CsV3Sb5 is an unconventional superconductor and its superconducting state is even more exotic at high pressures. |
| format | Article |
| id | doaj-art-0eb263cdbb0145ceaba86f07e206744d |
| institution | DOAJ |
| issn | 2041-1723 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj-art-0eb263cdbb0145ceaba86f07e206744d2025-08-20T03:18:32ZengNature PortfolioNature Communications2041-17232025-04-011611810.1038/s41467-025-58941-wFully-gapped superconductivity with rotational symmetry breaking in pressurized kagome metal CsV3Sb5X. Y. Feng0Z. Zhao1J. Luo2Y. Z. Zhou3J. Yang4A. F. Fang5H. T. Yang6H.-J. Gao7R. Zhou8Guo-qing Zheng9Institute of Physics, Chinese Academy of Sciences, and Beijing National Laboratory for Condensed Matter PhysicsInstitute of Physics, Chinese Academy of Sciences, and Beijing National Laboratory for Condensed Matter PhysicsInstitute of Physics, Chinese Academy of Sciences, and Beijing National Laboratory for Condensed Matter PhysicsInstitute of Physics, Chinese Academy of Sciences, and Beijing National Laboratory for Condensed Matter PhysicsInstitute of Physics, Chinese Academy of Sciences, and Beijing National Laboratory for Condensed Matter PhysicsSchool of Physics and Astronomy, Beijing Normal UniversityInstitute of Physics, Chinese Academy of Sciences, and Beijing National Laboratory for Condensed Matter PhysicsInstitute of Physics, Chinese Academy of Sciences, and Beijing National Laboratory for Condensed Matter PhysicsInstitute of Physics, Chinese Academy of Sciences, and Beijing National Laboratory for Condensed Matter PhysicsDepartment of Physics, Okayama UniversityAbstract 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/T 1 exhibits a kink at T ~ 0.4 T c within the superconducting state and follows a T 3 variation as temperature further decreases. This suggests the presence of two superconducting gaps with line nodes in the smaller one. As pressure increases beyond P c ~ 1.85 GPa, where the charge-density wave phase is completely suppressed, 1/T 1 shows no Hebel-Slichter peak just below T c, and decreases rapidly, even faster than T 5, indicating that the gap is fully opened for pressures above P c. In this high pressure region, the angular dependence of the in-plane upper critical magnetic field H c2 breaks the C 6 rotational symmetry. We propose the s + i d pairing at P > P c which explains both the 1/T 1 and H c2 behaviors. Our findings indicate that CsV3Sb5 is an unconventional superconductor and its superconducting state is even more exotic at high pressures.https://doi.org/10.1038/s41467-025-58941-w |
| spellingShingle | X. Y. Feng Z. Zhao J. Luo Y. Z. Zhou J. Yang A. F. Fang H. T. Yang H.-J. Gao R. Zhou Guo-qing Zheng Fully-gapped superconductivity with rotational symmetry breaking in pressurized kagome metal CsV3Sb5 Nature Communications |
| title | Fully-gapped superconductivity with rotational symmetry breaking in pressurized kagome metal CsV3Sb5 |
| title_full | Fully-gapped superconductivity with rotational symmetry breaking in pressurized kagome metal CsV3Sb5 |
| title_fullStr | Fully-gapped superconductivity with rotational symmetry breaking in pressurized kagome metal CsV3Sb5 |
| title_full_unstemmed | Fully-gapped superconductivity with rotational symmetry breaking in pressurized kagome metal CsV3Sb5 |
| title_short | Fully-gapped superconductivity with rotational symmetry breaking in pressurized kagome metal CsV3Sb5 |
| title_sort | fully gapped superconductivity with rotational symmetry breaking in pressurized kagome metal csv3sb5 |
| url | https://doi.org/10.1038/s41467-025-58941-w |
| work_keys_str_mv | AT xyfeng fullygappedsuperconductivitywithrotationalsymmetrybreakinginpressurizedkagomemetalcsv3sb5 AT zzhao fullygappedsuperconductivitywithrotationalsymmetrybreakinginpressurizedkagomemetalcsv3sb5 AT jluo fullygappedsuperconductivitywithrotationalsymmetrybreakinginpressurizedkagomemetalcsv3sb5 AT yzzhou fullygappedsuperconductivitywithrotationalsymmetrybreakinginpressurizedkagomemetalcsv3sb5 AT jyang fullygappedsuperconductivitywithrotationalsymmetrybreakinginpressurizedkagomemetalcsv3sb5 AT affang fullygappedsuperconductivitywithrotationalsymmetrybreakinginpressurizedkagomemetalcsv3sb5 AT htyang fullygappedsuperconductivitywithrotationalsymmetrybreakinginpressurizedkagomemetalcsv3sb5 AT hjgao fullygappedsuperconductivitywithrotationalsymmetrybreakinginpressurizedkagomemetalcsv3sb5 AT rzhou fullygappedsuperconductivitywithrotationalsymmetrybreakinginpressurizedkagomemetalcsv3sb5 AT guoqingzheng fullygappedsuperconductivitywithrotationalsymmetrybreakinginpressurizedkagomemetalcsv3sb5 |