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

*この研究の対応する著者

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

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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