Common Features in Electronic Structure of the Oxypnictide Superconductors from Photoemission Spectroscopy
JIA Xiao-Wen1, LIU Hai-Yun1, ZHANG Wen-Tao1, ZHAO Lin1, MENG Jian-Qiao1, LIU Guo-Dong1, DONG Xiao-Li1, WU Gang2, LIU Rong-Hua2, CHEN Xian-Hui2, REN Zhi-An1, YI Wei1, CHE Guang-Can1, CHEN Gen-Fu3, WANG Nan-Lin3, WANG Gui-Ling4, ZHOU Yong4, ZHU Yong5, WANG Xiao-Yang5, ZHAO Zhong-Xian1, XU Zu-Yan4, CHEN Chuang-Tian5, ZHOU Xing-Jiang1
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 1001902Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics, University of Science and Technology of China, Hefei 2300263Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 1001904Key Laboratory for Optics, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 1001905Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190
Common Features in Electronic Structure of the Oxypnictide Superconductors from Photoemission Spectroscopy
JIA Xiao-Wen1, LIU Hai-Yun1, ZHANG Wen-Tao1, ZHAO Lin1, MENG Jian-Qiao1, LIU Guo-Dong1, DONG Xiao-Li1, WU Gang2, LIU Rong-Hua2, CHEN Xian-Hui2, REN Zhi-An1, YI Wei1, CHE Guang-Can1, CHEN Gen-Fu3, WANG Nan-Lin3, WANG Gui-Ling4, ZHOU Yong4, ZHU Yong5, WANG Xiao-Yang5, ZHAO Zhong-Xian1, XU Zu-Yan4, CHEN Chuang-Tian5, ZHOU Xing-Jiang1
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 1001902Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics, University of Science and Technology of China, Hefei 2300263Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 1001904Key Laboratory for Optics, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 1001905Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190
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.
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.
[1] Kamihara et al 2008 J. Am. Chem. Soc. 130 3296 [2] Chen G F et al 2008 Phys. Rev. Lett. 101057007 [3] Wen H H et al 2008 Europhys. Lett. 82 17009 [4] Chen X H et al 2008 arXiv:cod-mat/0803.3603 [5] Chen G F et al 2008 Phys. Rev. Lett. 100247002 [6] Ren Z A et al 2008 Europhys. Lett. 82 57002 [7] Ren Z A et al 2008 Materials Research Innovations 12 1 [8] Ren Z A et al 2008 Chin. Phys. Lett. 25 2215 [9] Liu R H et al 2008 arXiv:cond-mat/0804.2105 [10] Bednorz et al 1986 Z. Phys. B 64 189 [11] Dong et al 2008 Europhys. Lett. 83 27006 [12] Cruz et al 2008 Nature 453 899 [13] Timusk and Statt 1999 Rep. Prog. Phys. 62 61 [14] Damascelli et al 2003 Rev. Mod. Phys. 75 473 [15] Ou H W et al 2008 Chin. Phys. Lett. 25 2225 [16] Ishida et al 2008 arXiv:cond-mat/0805.2647 [17] Sato et al 2008 J. Phys. Soc. Jpn. 77 063708 [18] Liu H Y et al 2008 arXiv:cond-mat/0805.3821 [19] Liu G D et al 2008 Rev. Sci. Instrum. 79023105 [20] Ishizaka et al 2007 Phys. Rev. Lett. 98047003 [21] Tsuda et al 2005 Phys. Rev. B 72 064527 [22] The work function is assumed to be 4.3\,eV [23] Norman et al 1998 Phys. Rev. B 57 R11093
2008, Vol. 25 
