Angle integrated photoemission study of SmO$_{0.85}$F$_{0.15}$FeAs

Details Angle integrated photoemission study of SmO$_{0.85}$F$_{0.15}$FeAs Angle integrated photoemission study of SmO$_{0.85}$F$_{0.15}$FeAs

2008-03-30

arxiv.org/abs/0803.4328v1

Chin. Phys. Lett. 25, 2225(2008)

Physics

Condensed Matter

Superconductivity

Scientific paper

The electronic structure of the new superconductor, SmO$_{1-x}$F$_x$FeAs ($x=0.15$), has been studied by angle-integrated photoemission spectroscopy. Our data show a sharp feature very close to the Fermi energy, and a relative flat distribution of the density of states between 0.5 eV and 3 eV binding energy, which agrees best with band structure calculations considering an antiferromagnetic ground state. No noticeable gap opening was observed at 12 Kelvin below the superconducting transition temperature, indicating the existence of large ungapped regions in the Brillouin zone.

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