Superconducting Gap and Pseudogap in Iron-Based Layered Superconductor La(O1-xFx)FeAs

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 5 K is 3.6 meV in the s- or axial p-wa...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2008-06, Vol.77 (6), p.63708
Main Authors: SATO, Takafumi, SOUMA, Seigo, NAKAYAMA, Kosuke, TERASHIMA, Kensei, SUGAWARA, Katsuaki, TAKAHASHI, Takashi, KAMIHARA, Yoichi, HIRANO, Masahiro, HOSONO, Hideo
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Physics
Properties of type I and type II superconductors
Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.)
Superconducting materials (excluding high-tc compounds)
Superconductivity
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Summary: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 5 K 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.
ISSN:0031-9015
1347-4073
DOI:10.1143/jpsj.77.063708