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

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Abstract

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.

Original languageEnglish
Article number060503
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number6
DOIs
Publication statusPublished - 2009 Feb 2
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Ishida, Y., Shimojima, T., Ishizaka, K., Kiss, T., Okawa, M., Togashi, T., Watanabe, S., Wang, X. Y., Chen, C. T., Kamihara, Y., Hirano, M., Hosono, H., & Shin, S. (2009). Temperature-dependent pseudogap in the oxypnictides LaFeAsO1-x Fx and LaFePO1-x Fx seen via angle-integrated photoemission. Physical Review B - Condensed Matter and Materials Physics, 79(6), [060503]. https://doi.org/10.1103/PhysRevB.79.060503