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

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2008 Chinese Physical Society and IOP Publishing Ltd
, , Citation Liu Hai-Yun et al 2008 Chinese Phys. Lett. 25 3761 DOI 10.1088/0256-307X/25/10/066

0256-307X/25/10/3761

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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10.1088/0256-307X/25/10/066