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W3159151145 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." @default.
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W3159151145 date "2021-06-01" @default.
W3159151145 modified "2023-09-25" @default.
W3159151145 title "Common (π,π) Band Folding and Surface Reconstruction in FeAs-Based Superconductors" @default.
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W3159151145 doi "https://doi.org/10.1088/0256-307x/38/5/057404" @default.
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