Common Features in Electronic Structure of the Oxypnictide Superconductors from Photoemission Spectroscopy
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JIA Xiao-Wen,
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LIU Hai-Yun,
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ZHANG Wen-Tao,
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ZHAO Lin,
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MENG Jian-Qiao,
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LIU Guo-Dong,
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DONG Xiao-Li,
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WU Gang,
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LIU Rong-Hua,
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CHEN Xian-Hui,
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REN Zhi-An,
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YI Wei,
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CHE Guang-Can,
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CHEN Gen-Fu,
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WANG Nan-Lin,
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WANG Gui-Ling,
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ZHOU Yong,
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ZHU Yong,
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WANG Xiao-Yang,
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ZHAO Zhong-Xian,
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XU Zu-Yan,
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CHEN Chuang-Tian,
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ZHOU Xing-Jiang
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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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