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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101 Citations (Scopus)

Abstract

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
Volume77
Issue number6
DOIs
Publication statusPublished - 2008 Jun 1
Externally publishedYes

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Sato, T., Souma, S., Nakayama, K., Terashima, K., Sugawara, K., Takahashi, T., Kamihara, Y., Hirano, M., & Hosono, H. (2008). Superconducting gap and pseudogap in iron-based layered superconductor La(O1-xFx)FeAs. Journal of the Physical Society of Japan, 77(6), [063708]. https://doi.org/10.1143/JPSJ.77.063708