Evidence of electron interaction with an unidentified bosonic mode in superconductor CsCa2Fe4As4F2

Peng Li, Sen Liao, Zhicheng Wang, Huaxun Li, Shiwu Su, Jiakang Zhang, Ziyuan Chen, Zhicheng Jiang, Zhengtai Liu, Lexian Yang, Linwei Huai, Junfeng He, Shengtao Cui, Zhe Sun, Yajun Yan, Guanghan Cao, Dawei Shen, Juan Jiang () and Donglai Feng ()
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Peng Li: University of Science and Technology of China
Sen Liao: University of Science and Technology of China
Zhicheng Wang: Southeast University
Huaxun Li: Zhejiang University
Shiwu Su: University of Science and Technology of China
Jiakang Zhang: University of Science and Technology of China
Ziyuan Chen: University of Science and Technology of China
Zhicheng Jiang: University of Science and Technology of China
Zhengtai Liu: Chinese Academy of Sciences
Lexian Yang: Tsinghua University
Linwei Huai: University of Science and Technology of China
Junfeng He: University of Science and Technology of China
Shengtao Cui: University of Science and Technology of China
Zhe Sun: University of Science and Technology of China
Yajun Yan: University of Science and Technology of China
Guanghan Cao: Zhejiang University
Dawei Shen: University of Science and Technology of China
Juan Jiang: University of Science and Technology of China
Donglai Feng: University of Science and Technology of China

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract 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 CsCa2Fe4As4F2 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 $$\Gamma -{{\rm{{M}}}}$$ Γ − M direction at the band with dxz orbital character and vanishes when approaching the $$\Gamma -{{\rm{{X}}}}$$ Γ − 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 (~ $$9\pm 1$$ 9 ± 1 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.

Date: 2024
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DOI: 10.1038/s41467-024-50833-9

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