Common Features in Electronic Structure of the Oxypnictide Superconductors from Photoemission Spectroscopy
2008; Institute of Physics; Volume: 25; Issue: 10 Linguagem: Inglês
10.1088/0256-307x/25/10/067
ISSN1741-3540
AutoresJia Xiao-Wen, Haiyun Liu, Wentao Zhang, Lin Zhao, Meng Jian-Qiao, Ye Liu, Xiaoli Dong, Gang Wu, Rong-Hua Liu, Chen Xianhui, Ren Zhi-An, Yi Feng Wei, Guangcan Che, Chen Gen-Fu, Wang Nan-Lin, Guiling Wang, Yong Zhou, Zhu Yong, Xiaoyang Wang, Zhongxian Zhao, Zuyan Xu, Chuangtian Chen, Zhou Xingjiang,
Tópico(s)Rare-earth and actinide compounds
ResumoHigh 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) 0.2 eV feature in the valence band, (2) a universal 13-16 meV 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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