Flat-band enhanced antiferromagnetic fluctuations and superconductivity in pressurized CsCr3Sb5
Abstract The spin dynamics and electronic orders of the kagome system at different filling levels stand as an intriguing subject in condensed matter physics. By first-principles calculations and random phase approximation analyses, we investigate the spin fluctuations and superconducting instabiliti...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-02-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-025-56582-7 |
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| author | Siqi Wu Chenchao Xu Xiaoqun Wang Hai-Qing Lin Chao Cao Guang-Han Cao |
| author_facet | Siqi Wu Chenchao Xu Xiaoqun Wang Hai-Qing Lin Chao Cao Guang-Han Cao |
| author_sort | Siqi Wu |
| collection | DOAJ |
| description | Abstract The spin dynamics and electronic orders of the kagome system at different filling levels stand as an intriguing subject in condensed matter physics. By first-principles calculations and random phase approximation analyses, we investigate the spin fluctuations and superconducting instabilities in kagome phase of CsCr3Sb5 under high pressure. At the filling level slightly below the kagome flat bands, our calculations reveal strong antiferromagnetic spin fluctuations in CsCr3Sb5, together with a leading s ±-wave and a competing (d x y , $${d}_{{x}^{2}-{y}^{2}}$$ d x 2 − y 2 )-wave superconducting order. Unlike the general intuition that the flat bands are closely related to the ferromagnetic correlations, here we propose a sublattice-momentum-coupling-driven mechanism for the antiferromagnetic fluctuations enhanced from the unoccupied flat bands. The mechanism is generally applicable to kagome systems where the Fermi level intersects near the flat bands, offering a new perspective for future studies of geometrically frustrated systems. |
| format | Article |
| id | doaj-art-ba8f28823db64bdca0827e912d2c13ac |
| institution | Kabale University |
| issn | 2041-1723 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj-art-ba8f28823db64bdca0827e912d2c13ac2025-02-09T12:45:17ZengNature PortfolioNature Communications2041-17232025-02-011611810.1038/s41467-025-56582-7Flat-band enhanced antiferromagnetic fluctuations and superconductivity in pressurized CsCr3Sb5Siqi Wu0Chenchao Xu1Xiaoqun Wang2Hai-Qing Lin3Chao Cao4Guang-Han Cao5School of Physics, Zhejiang UniversitySchool of Physics, Hangzhou Normal UniversitySchool of Physics, Zhejiang UniversitySchool of Physics, Zhejiang UniversitySchool of Physics, Zhejiang UniversitySchool of Physics, Zhejiang UniversityAbstract The spin dynamics and electronic orders of the kagome system at different filling levels stand as an intriguing subject in condensed matter physics. By first-principles calculations and random phase approximation analyses, we investigate the spin fluctuations and superconducting instabilities in kagome phase of CsCr3Sb5 under high pressure. At the filling level slightly below the kagome flat bands, our calculations reveal strong antiferromagnetic spin fluctuations in CsCr3Sb5, together with a leading s ±-wave and a competing (d x y , $${d}_{{x}^{2}-{y}^{2}}$$ d x 2 − y 2 )-wave superconducting order. Unlike the general intuition that the flat bands are closely related to the ferromagnetic correlations, here we propose a sublattice-momentum-coupling-driven mechanism for the antiferromagnetic fluctuations enhanced from the unoccupied flat bands. The mechanism is generally applicable to kagome systems where the Fermi level intersects near the flat bands, offering a new perspective for future studies of geometrically frustrated systems.https://doi.org/10.1038/s41467-025-56582-7 |
| spellingShingle | Siqi Wu Chenchao Xu Xiaoqun Wang Hai-Qing Lin Chao Cao Guang-Han Cao Flat-band enhanced antiferromagnetic fluctuations and superconductivity in pressurized CsCr3Sb5 Nature Communications |
| title | Flat-band enhanced antiferromagnetic fluctuations and superconductivity in pressurized CsCr3Sb5 |
| title_full | Flat-band enhanced antiferromagnetic fluctuations and superconductivity in pressurized CsCr3Sb5 |
| title_fullStr | Flat-band enhanced antiferromagnetic fluctuations and superconductivity in pressurized CsCr3Sb5 |
| title_full_unstemmed | Flat-band enhanced antiferromagnetic fluctuations and superconductivity in pressurized CsCr3Sb5 |
| title_short | Flat-band enhanced antiferromagnetic fluctuations and superconductivity in pressurized CsCr3Sb5 |
| title_sort | flat band enhanced antiferromagnetic fluctuations and superconductivity in pressurized cscr3sb5 |
| url | https://doi.org/10.1038/s41467-025-56582-7 |
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