Common Features in Electronic Structure of the Oxypnictide Superconductors from Photoemission Spectroscopy |
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Authors: | JIA Xiao-Wen LIU Hai-Yun ZHANG Wen-Tao ZHAO Lin MENG Jian-Qiao LIU Guo-Dong DONG Xiao-Li WU Gang LIU Rong-Hua CHEN Xian-Hui REN Zhi-An YI Wei CHE Guang-Can CHEN Gen-Fu WANG Nan-Lin WANG Gui-Ling ZHOU Yong ZHU Yong WANG Xiao-Yang ZHAO Zhong-Xian XU Zu-Yan CHEN Chuang-Tian ZHOU Xing-Jiang |
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Affiliation: | [1]Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190; [2]Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics, University of Science and Technology of China, Hefei 230026; [3]Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Belting 100190; [4]Key Laboratory for Optics, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190; [5]Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190 |
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Abstract: | High resolution photoemission measurements are carried out on non-superconducting LaFeAsO parent compound and various superconducting RFeAs(O1-xFx) (R=La, Ce and Pr) compounds. It is found that the parent LaFeAsO compound shows a metallic character. By extensive measurements, several common features are identified in the electronic structure of these Fe-based compounds: (1) 0.2eV feature in the valence band, (2) a universal 13--16meV feature, (3) near EF spectral weight suppression with decreasing temperature. These universal features can provide important information about band structure, superconducting gap and pseudogap in these Fe-based materials. |
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Keywords: | 74 70 -b 74 25 Jb 79 60 -i 71 20 -b |
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