| Original Articles |
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Pseudogap and Superconducting Gap in SmFeAs(O1-xFx) Superconductor from Photoemission Spectroscopy |
| Hai-Yun1, JIA Xiao-Wen1, 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 |
| 1National Laboratory for Superconductivity, Beijing 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 2300263Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, 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 |
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| Cite this article: |
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LIU Hai-Yun, JIA Xiao-Wen, ZHANG Wen-Tao et al 2008 Chin. Phys. Lett. 25 3761-3764 |
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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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| Keywords:
74.70.-b
74.25.Jb
79.60.-i
71.20.-b
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Received: 26 August 2008
Published: 26 September 2008
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| PACS: |
74.70.-b
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(Superconducting materials other than cuprates)
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74.25.Jb
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(Electronic structure (photoemission, etc.))
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79.60.-i
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(Photoemission and photoelectron spectra)
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71.20.-b
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(Electron density of states and band structure of crystalline solids)
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