Evidence of electron interaction with an unidentified bosonic mode in superconductor CsCa$_2$Fe$_4$As$_4$F$_2$
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| Main Authors: | , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916342554165248 |
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| author | Li, Peng Liao, Sen Wang, Zhicheng Li, Huaxun Su, Shiwu Zhang, Jiakang Chen, Ziyuan Jiang, Zhicheng Liu, Zhengtai Yang, Lexian Huai, Linwei He, Junfeng Cui, Shengtao Sun, Zhe Yan, Yajun Cao, Guanghan Shen, Dawei Jiang, Juan Feng, Donglai |
| author_facet | Li, Peng Liao, Sen Wang, Zhicheng Li, Huaxun Su, Shiwu Zhang, Jiakang Chen, Ziyuan Jiang, Zhicheng Liu, Zhengtai Yang, Lexian Huai, Linwei He, Junfeng Cui, Shengtao Sun, Zhe Yan, Yajun Cao, Guanghan Shen, Dawei Jiang, Juan Feng, Donglai |
| contents | The kink structure in band dispersion usually refers to a certain electron-boson interaction, which is crucial in understanding the pairing in unconventional superconductors. Here we report the evidence of the observation of a kink structure in Fe-based superconductor CsCa$_2$Fe$_4$As$_4$F$_2$ using angle-resolved photoemission spectroscopy. The kink shows an orbital selective and momentum dependent behavior, which is located at 15 meV below Fermi level along the Gamma-M direction at the band with dxz orbital character and vanishes when approaching the Gamma-X direction, correlated with a slight decrease of the superconducting gap. Most importantly, this kink structure disappears when the superconducting gap closes, indicating that the corresponding bosonic mode (9 meV) is closely related to superconductivity. However, the origin of this mode remains unidentified, since it cannot be related to phonons or the spin resonance mode (15 meV) observed by inelastic neutron scattering. The behavior of this mode is rather unique and challenges our present understanding of the superconducting paring mechanism of the bilayer FeAs-based superconductors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_00469 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Evidence of electron interaction with an unidentified bosonic mode in superconductor CsCa$_2$Fe$_4$As$_4$F$_2$ Li, Peng Liao, Sen Wang, Zhicheng Li, Huaxun Su, Shiwu Zhang, Jiakang Chen, Ziyuan Jiang, Zhicheng Liu, Zhengtai Yang, Lexian Huai, Linwei He, Junfeng Cui, Shengtao Sun, Zhe Yan, Yajun Cao, Guanghan Shen, Dawei Jiang, Juan Feng, Donglai Superconductivity Strongly Correlated Electrons The kink structure in band dispersion usually refers to a certain electron-boson interaction, which is crucial in understanding the pairing in unconventional superconductors. Here we report the evidence of the observation of a kink structure in Fe-based superconductor CsCa$_2$Fe$_4$As$_4$F$_2$ using angle-resolved photoemission spectroscopy. The kink shows an orbital selective and momentum dependent behavior, which is located at 15 meV below Fermi level along the Gamma-M direction at the band with dxz orbital character and vanishes when approaching the Gamma-X direction, correlated with a slight decrease of the superconducting gap. Most importantly, this kink structure disappears when the superconducting gap closes, indicating that the corresponding bosonic mode (9 meV) is closely related to superconductivity. However, the origin of this mode remains unidentified, since it cannot be related to phonons or the spin resonance mode (15 meV) observed by inelastic neutron scattering. The behavior of this mode is rather unique and challenges our present understanding of the superconducting paring mechanism of the bilayer FeAs-based superconductors. |
| title | Evidence of electron interaction with an unidentified bosonic mode in superconductor CsCa$_2$Fe$_4$As$_4$F$_2$ |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2408.00469 |