Common (π,π) Band Folding and Surface Reconstruction in FeAs-Based Superconductors

Publication

Author: Yongqing Cai (蔡永青), Tao Xie (谢涛), Huan Yang (杨欢), Dingsong Wu (吴定松), Jianwei Huang (黄建伟), Wenshan Hong (洪文山), Lu Cao (曹路), Chang Liu (刘畅), Cong Li (李聪), Yu Xu (徐煜), Qiang Gao (高强), Taimin Miao (苗泰民), Guodong Liu (刘国东), Shiliang Li (李世亮), Li Huang (黄立), Huiqian Luo (罗会仟), Zuyan Xu (许祖彦), Hongjun Gao (高鸿钧), Lin Zhao (赵林), X J Zhou (周兴江) Chinese Physics Letters
URL: https://doi.org/10.1088/0256-307X/38/5/057404
Date: 2021 Instruments: ARPES Lab, DA30-L, VUV5k

High resolution angle-resolved photoemission spectroscopy (ARPES) measurements are carried out on CaKFe4As4, KCa2Fe4As4F2 and (Ba0.6K0.4)Fe2As2 superconductors. Clear evidence of band folding between the Brillouin zone center and corners with a (π,π) wave vector has been found from the measured Fermi surface and band structures in all the three kinds of superconductors. A dominant dominant √2 x √2 surface reconstruction is observed on the cleaved surface of CaKFe4As4 by scanning tunneling microscopy (STM) measurements. We propose that the commonly observed √2 x √2 reconstruction in the FeAs-based superconductors provides a general scenario to understand the origin of the (π,π) band folding. Our observations provide new insights in understanding the electronic structure and superconductivity mechanism in iron-based superconductors.

Common (π,π) Band Folding and Surface Reconstruction in FeAs-Based Superconductors

Publication

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