Temperature-dependent pseudogap in the oxypnictides LaFeAsO1-x Fx and LaFePO1-x Fx seen via angle-integrated photoemission

Y. Ishida, T. Shimojima, K. Ishizaka, T. Kiss, M. Okawa, T. Togashi, S. Watanabe, X. Y. Wang, C. T. Chen, Y. Kamihara, M. Hirano, H. Hosono, S. Shin

研究成果: Article査読

25 被引用数 (Scopus)

抄録

We have performed a temperature-dependent angle-integrated laser photoemission study of iron oxypnictide superconductors LaFeAsO:F and LaFePO:F exhibiting critical-transition temperatures (Tc 's) of 26 and 5 K, respectively. We find that high- Tc LaFeAsO:F exhibits a temperature-dependent pseudogaplike feature extending over ∼0.1 eV about the Fermi level at 250 K, whereas such a feature is absent in low- Tc LaFePO:F. We also find ∼20-meV pseudogaplike features and signatures of superconducting gaps in both LaFeAsO:F and LaFePO:F. We discuss the possible origins of the unusual pseudogaplike features through comparison with the high- Tc cuprates.

本文言語English
論文番号060503
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
79
6
DOI
出版ステータスPublished - 2009 2 2
外部発表はい

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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