| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Common ($\pi$,$\pi$) Band Folding and Surface Reconstruction in FeAs-Based Superconductors |
| Yongqing Cai1,2†, Tao Xie1†, Huan Yang1,2†, Dingsong Wu1,2, Jianwei Huang1,2, Wenshan Hong1,2, Lu Cao1,2, Chang Liu1,2, Cong Li1,2, Yu Xu1,2, Qiang Gao1,2, Taimin Miao1,2, Guodong Liu1,2,3, Shiliang Li1,2,3, Li Huang1, Huiqian Luo1,2,3, Zuyan Xu4, Hongjun Gao1,2,3,5, Lin Zhao1,2,3*, and X. J. Zhou1,2,3,6* |
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2University of Chinese Academy of Sciences, Beijing 100049, China
3Songshan Lake Materials Laboratory, Dongguan 523808, China
4Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
5CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China
6Beijing Academy of Quantum Information Sciences, Beijing 100193, China
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| Cite this article: |
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Yongqing Cai, Tao Xie, Huan Yang et al 2021 Chin. Phys. Lett. 38 057404 |
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Abstract High resolution angle-resolved photoemission spectroscopy (ARPES) measurements are carried out on CaKFe$_4$As$_4$, KCa$_2$Fe$_4$As$_4$F$_2$ and (Ba$_{0.6}$K$_{0.4}$)Fe$_2$As$_2$ superconductors. Clear evidence of band folding between the Brillouin zone center and corners with a ($\pi$,$\pi$) wave vector has been found from the measured Fermi surface and band structures in all the three kinds of superconductors. A dominant $\sqrt{2} \times \sqrt{2}$ surface reconstruction is observed on the cleaved surface of CaKFe$_4$As$_4$ by scanning tunneling microscopy (STM) measurements. We propose that the commonly observed $\sqrt{2} \times \sqrt{2}$ reconstruction in the FeAs-based superconductors provides a general scenario to understand the origin of the ($\pi$,$\pi$) band folding. Our observations provide new insights in understanding the electronic structure and superconductivity mechanism in iron-based superconductors.
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Received: 12 April 2021
Published: 02 May 2021
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| PACS: |
74.70.-b
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(Superconducting materials other than cuprates)
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74.25.Jb
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(Electronic structure (photoemission, etc.))
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79.60.-i
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(Photoemission and photoelectron spectra)
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71.20.-b
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(Electron density of states and band structure of crystalline solids)
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| Fund: Supported by the National Key Research and Development Program of China (Grant Nos. 2016YFA0300300, 2017YFA0302900, 2018YFA0704200 and 2019YFA0308000), the National Natural Science Foundation of China (Grant Nos. 11888101, 11922414 and 11874405), the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB25000000), the Youth Innovation Promotion Association of CAS (Grant No. 2017013), and the Research Program of Beijing Academy of Quantum Information Sciences (Grant No. Y18G06). |
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