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arXiv · 0806.0291

Common Features in Electronic Structure of the Fe-Based Layered Superconductors from Photoemission Spectroscopy

Xiaowen Jia·Haiyun Liu·Wentao Zhang·Lin Zhao·Jianqiao Meng·Guodong Liu·Xiaoli Dong·G. F. Chen·J. L. Luo·N. L. Wang·Z. A. Ren·Wei Yi·Jie Yang·Wei Lu·G. C. Che·G. Wu·R. H. Liu·X. H. Chen·Guiling Wang·Yong Zhou·Yong Zhu·Xiaoyang Wang·Zhongxian Zhao·Zuyan Xu·Chuangtian Chen·X. J. Zhou
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Abstract

High resolution photoemission measurements have been carried out on non-superconducting LaOFeAs parent compound and various superconducting R(O1-xFx)FeAs (R=La, Ce and Pr) compounds. We found that the parent LaOFeAs compound shows a metallic character. Through extensive measurements, we have identified several common features 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). A clear Fermi cutoff showing zero leading-edge shift in the superconducting state;(4). Lack of superconducting coherence peak(s); (5). 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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Xiaowen Jia, Haiyun Liu, Wentao Zhang, Lin Zhao, Jianqiao Meng, Guodong Liu, Xiaoli Dong, G. F. Chen, J. L. Luo, N. L. Wang, Z. A. Ren, Wei Yi, Jie Yang, Wei Lu, G. C. Che, G. Wu, R. H. Liu, X. H. Chen, Guiling Wang, Yong Zhou, Yong Zhu, Xiaoyang Wang, Zhongxian Zhao, Zuyan Xu, Chuangtian Chen, X. J. Zhou. 2008-06-03. Common Features in Electronic Structure of the Fe-Based Layered Superconductors from Photoemission Spectroscopy. https://doi.org/10.1088/0256-307x%2F25%2F10%2F067

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