Author:
Cai Yongqing,Xie Tao,Yang Huan,Wu Dingsong,Huang Jianwei,Hong Wenshan,Cao Lu,Liu Chang,Li Cong,Xu Yu,Gao Qiang,Miao Taimin,Liu Guodong,Li Shiliang,Huang Li,Luo Huiqian,Xu Zuyan,Gao Hongjun,Zhao Lin,Zhou X. J.
Abstract
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
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surface reconstruction is observed on the cleaved surface of CaKFe4As4 by scanning tunneling microscopy (STM) measurements. We propose that the commonly observed
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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.
Subject
General Physics and Astronomy
Cited by
6 articles.
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