Superconductivity in unconventional metals
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arXiv
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| Auteurs principaux: | , , , , , , , |
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| Format: | Preprint |
| Publié: |
2023
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| _version_ | 1866914309149294592 |
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| author | Yang, Zhilong Sheng, Haohao Guo, Zhaopeng Zhang, Ruihan Wu, Quansheng Weng, Hongming Fang, Zhong Wang, Zhijun |
| author_facet | Yang, Zhilong Sheng, Haohao Guo, Zhaopeng Zhang, Ruihan Wu, Quansheng Weng, Hongming Fang, Zhong Wang, Zhijun |
| contents | Based on first-principles calculations, we demonstrate that 1H/2H-phase transition metal dichalcogenides MX2 (M=Nb,Ta; X=S,Se,Te) are unconventional metals, which have an empty-site band of $A_1'@1e$ elementary band representation at the Fermi level. The computed phonon dispersions indicate the stability of the system at high temperatures, while the presence of the soft phonon mode suggests a phase transition to the charge density wave state at low temperatures. Based on the Bardeen-Cooper-Schrieffer theory and computed electron-phonon coupling, our calculations show that the superconductivity (SC) in NbSe2 is mainly attributed to the soft phonon mode due to the half filling of the empty-site band. Accordingly, the SC has been predicted in unconventional metals TaNS monolayer and 2H-TaN2 bulk with computed $T_C=$ 10 K and 26 K respectively. These results demonstrate that the unconventional metals with partial filling of the empty-site band offer an attractive platform to search for superconductors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2306_08347 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Superconductivity in unconventional metals Yang, Zhilong Sheng, Haohao Guo, Zhaopeng Zhang, Ruihan Wu, Quansheng Weng, Hongming Fang, Zhong Wang, Zhijun Materials Science Superconductivity Based on first-principles calculations, we demonstrate that 1H/2H-phase transition metal dichalcogenides MX2 (M=Nb,Ta; X=S,Se,Te) are unconventional metals, which have an empty-site band of $A_1'@1e$ elementary band representation at the Fermi level. The computed phonon dispersions indicate the stability of the system at high temperatures, while the presence of the soft phonon mode suggests a phase transition to the charge density wave state at low temperatures. Based on the Bardeen-Cooper-Schrieffer theory and computed electron-phonon coupling, our calculations show that the superconductivity (SC) in NbSe2 is mainly attributed to the soft phonon mode due to the half filling of the empty-site band. Accordingly, the SC has been predicted in unconventional metals TaNS monolayer and 2H-TaN2 bulk with computed $T_C=$ 10 K and 26 K respectively. These results demonstrate that the unconventional metals with partial filling of the empty-site band offer an attractive platform to search for superconductors. |
| title | Superconductivity in unconventional metals |
| topic | Materials Science Superconductivity |
| url | https://arxiv.org/abs/2306.08347 |