Superconducting gap and pseudogap in iron-based layered superconductor La(O1-xFx)FeAs

Takafumi Sato, Seigo Souma, Kosuke Nakayama, Kensei Terashima, Katsuaki Sugawara, Takashi Takahashi, Yoichi Kamihara, Masahiro Hirano, Hideo Hosono

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111 Citations (Scopus)


We report high-resolution photoemission spectroscopy of newly-discovered iron-based layered superconductor La(O0.93F0.07)FeAs (Tc = 24 K). We found that the superconducting gap shows a marked deviation from the isotropic s-wave symmetry. The estimated gap size at 5K is 3.6 meV in the s- or axial p-wave case, while it is 4.1 meV in the polar p- or d-wave case. We also found a pseudogap of 15-20 meV above Tc, which is gradually filled-in with increasing temperature and closes at temperature far above Tc similarly to copper-oxide high-temperature superconductors.

Original languageEnglish
Article number063708
JournalJournal of the Physical Society of Japan
Issue number6
Publication statusPublished - 2008 Jun


  • Iron-based superconductor
  • Photoemission spectroscopy
  • Pseudogap
  • Superconducting gap


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