Absence of BCS-BEC Crossover in FeSe0.45Te0 55 Superconductor
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916339545800704 |
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| author | Jia, Junjie Gu, Yadong Yin, Chaohui Shu, Yingjie Chen, Yiwen Shi, Jumin Zhang, Xing Chen, Hao Miao, Taimin Ren, Xiaolin Liang, Bo Zhu, Wenpei Cai, Neng Zhang, Fengfeng Zhang, Shenjin Yang, Feng Wang, Zhimin Peng, Qinjun Xu, Zuyan Mao, Hanqing Liu, Guodong Ren, Zhian Zhao, Lin Zhou, X. J. |
| author_facet | Jia, Junjie Gu, Yadong Yin, Chaohui Shu, Yingjie Chen, Yiwen Shi, Jumin Zhang, Xing Chen, Hao Miao, Taimin Ren, Xiaolin Liang, Bo Zhu, Wenpei Cai, Neng Zhang, Fengfeng Zhang, Shenjin Yang, Feng Wang, Zhimin Peng, Qinjun Xu, Zuyan Mao, Hanqing Liu, Guodong Ren, Zhian Zhao, Lin Zhou, X. J. |
| contents | In iron-based superconductor Fe(Se,Te), a flat band-like feature near the Fermi level was observed around the Brillouin zone center in the superconducting state. It is under debate whether this is the evidence on the presence of the BCS-BEC crossover in the superconductor. High-resolution laser-based angle-resolved photoemission measurements are carried out on high quality single crystals of FeSe0.45Te0.55 superconductor to address the issue. By employing different polarization geometries, we have resolved and isolated the dyz band and the topological surface band, making it possible to study their superconducting behaviors separately. The dyz band alone does not form a flat band-like feature in the superconducting state and the measured dispersion can be well described by the BCS picture. We find that the flat band-like feature is formed from the combination of the dyz band and the topological surface state band in the superconducting state. These results reveal the origin of the flat band-like feature and rule out the presence of BCS-BEC crossover in Fe(Se,Te) superconductor. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_20771 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Absence of BCS-BEC Crossover in FeSe0.45Te0 55 Superconductor Jia, Junjie Gu, Yadong Yin, Chaohui Shu, Yingjie Chen, Yiwen Shi, Jumin Zhang, Xing Chen, Hao Miao, Taimin Ren, Xiaolin Liang, Bo Zhu, Wenpei Cai, Neng Zhang, Fengfeng Zhang, Shenjin Yang, Feng Wang, Zhimin Peng, Qinjun Xu, Zuyan Mao, Hanqing Liu, Guodong Ren, Zhian Zhao, Lin Zhou, X. J. Superconductivity In iron-based superconductor Fe(Se,Te), a flat band-like feature near the Fermi level was observed around the Brillouin zone center in the superconducting state. It is under debate whether this is the evidence on the presence of the BCS-BEC crossover in the superconductor. High-resolution laser-based angle-resolved photoemission measurements are carried out on high quality single crystals of FeSe0.45Te0.55 superconductor to address the issue. By employing different polarization geometries, we have resolved and isolated the dyz band and the topological surface band, making it possible to study their superconducting behaviors separately. The dyz band alone does not form a flat band-like feature in the superconducting state and the measured dispersion can be well described by the BCS picture. We find that the flat band-like feature is formed from the combination of the dyz band and the topological surface state band in the superconducting state. These results reveal the origin of the flat band-like feature and rule out the presence of BCS-BEC crossover in Fe(Se,Te) superconductor. |
| title | Absence of BCS-BEC Crossover in FeSe0.45Te0 55 Superconductor |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2407.20771 |