تقرير
Testing Electron-phonon Coupling for the Superconductivity in Kagome Metal $\rm{CsV_3Sb_5}$
| العنوان: | Testing Electron-phonon Coupling for the Superconductivity in Kagome Metal $\rm{CsV_3Sb_5}$ |
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| المؤلفون: | Zhong, Yigui, Li, Shaozhi, Liu, Hongxiong, Dong, Yuyang, Aido, Kohei, Arai, Yosuke, Li, Haoxiang, Zhang, Weilu, Shi, Youguo, Wang, Ziqiang, Shin, Shik, Lee, H. N., Miao, H., Kondo, Takeshi, Okazaki, Kozo |
| المصدر: | Nature Communications 14, 1945 (2023) |
| سنة النشر: | 2022 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Superconductivity, Condensed Matter - Materials Science |
| الوصف: | In crystalline materials, electron-phonon coupling (EPC) is a ubiquitous many-body interaction that drives conventional Bardeen-Cooper-Schrieffer superconductivity. Recently, in a new kagome metal $\rm{CsV_3Sb_5}$, superconductivity that possibly intertwines with time-reversal and spatial symmetry-breaking orders is observed. Density functional theory calculations predicted weak EPC strength,$\lambda$, supporting an unconventional pairing mechanism in $\rm{CsV_3Sb_5}$. However, experimental determination of $\lambda$ is still missing, hindering a microscopic understanding of the intertwined ground state of $\rm{CsV_3Sb_5}$. Here, using 7-eV laser-based angle-resolved photoemission spectroscopy and Eliashberg function analysis, we determine an intermediate $\lambda$=0.45~0.6 at T=6 K for both Sb 5p and V 3d electronic bands, which can support a conventional superconducting transition temperature on the same magnitude of experimental value in $\rm{CsV_3Sb_5}$. Remarkably, the EPC on the V 3d-band enhances to $\lambda$~0.75 as the superconducting transition temperature elevated to 4.4 K in $\rm{Cs(V_{0.93}Nb_{0.07})_3Sb_5}$. Our results provide an important clue to understand the pairing mechanism in the Kagome superconductor $\rm{CsV_3Sb_5}$. Comment: To appear in Nature Communications |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1038/s41467-023-37605-7 |
| URL الوصول: | http://arxiv.org/abs/2207.02407 |
| رقم الأكسشن: | edsarx.2207.02407 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1038/s41467-023-37605-7 |
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