Pseudogap and Superconducting Gap in SmFeAs(O1-xFx) Superconductor from Photoemission Spectroscopy
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LIU Hai-Yun,
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JIA Xiao-Wen,
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ZHANG Wen-Tao,
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ZHAO Lin,
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MENG Jian-Qiao,
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LIU Guo-Dong,
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DONG Xiao-Li,
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WU Gang,
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LIU Rong-Hua,
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CHEN Xian-Hui,
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REN Zhi-An,
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YI Wei,
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CHE Guang-Can,
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CHEN Gen-Fu,
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WANG Nan-Lin,
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WANG Gui-Ling,
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ZHOU Yong,
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ZHU Yong,
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WANG Xiao-Yang,
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ZHAO Zhong-Xian,
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XU Zu-Yan,
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CHEN Chuang-Tian,
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ZHOU Xing-Jiang
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Abstract
High resolution photoemission measurements are carried out on non-superconducting SmOFeAs parent compound and superconducting SmFeAs(O1-xFx) (x=0.12, and 0.15) compounds. The momentum-integrated spectra exhibit a clear Fermi cutoff that shows little leading-edge shift in the superconducting state. A robust feature at 13meV is identified in all these samples. Spectral weight suppression near EF with decreasing temperature is observed in both undoped and doped samples that points to a possible existence of a pseudogap in these Fe-based compounds.
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