Physics – Condensed Matter – Superconductivity
Scientific paper
2008-06-02
Chinese Physics Letters 25(2008)3765
Physics
Condensed Matter
Superconductivity
5 pages,4 figures
Scientific paper
10.1088/0256-307X/25/10/067
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.
Che Guang-Can
Chen Chuangtian
Chen Guo-Feng
Chen Hua-Xing
Dong Xiaoli
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