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Common Features in Electronic Structure of the Oxypnictide Superconductors from Photoemission Spectroscopy
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
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
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.
Keywords:74  70  -b  74  25  Jb  79  60  -i  71  20  -b
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