Pseudogap and Superconducting Gap in SmFeAs(O1-xFx) Superconductor from Photoemission Spectroscopy

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2008,（10）
• 页码范围: 3761-3764
• 页数: 4页
• 语种: 英文

摘要

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 13 meV 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.