Unusual pseudogap features observed in iron oxypnictide superconductors

Yukiaki Ishida, Takahiro Shimojima, Kyoko Ishizaka, Takayuki Kiss, Mario Okawa, Tadashi Togashi, Shuntaro Watanabe, Xiaoyang Wang, Chuangtian Chen, Yoichi Kamihara, Masahiro Hirano, Hideo Hosono, Shik Shin

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


We present angle-integrated photoemission spectroscopy (PES) study of LaOFeAs:F (Tc = 26 K) and LaOFeP:F (Tc = 5 K) using He I line (h? = 21.2 eV) and laser (h? = 6.994 eV) as excitation light sources. We find quantitatively consistent results between the He I and the laser PES measurements: LaFeAsO:F exhibits a temperature-dependent pseudogap as large as ∼0.1 eV at 300 K, whereas LaFePO:F exhibits a ∼20-meV pseudogap. We discuss possible origin of the T -dependent pseudogap specifically observed in LaFeAsO:F through comparison with other materials that exhibit unusual T -dependent pseudogaps.

Original languageEnglish
Pages (from-to)61-64
Number of pages4
JournalJournal of the Physical Society of Japan
Issue numberSUPPL. C
Publication statusPublished - 2008
Externally publishedYes


  • Iron oxypnicite superconductors
  • Photoemission spectroscopy
  • Pseudogap

ASJC Scopus subject areas

  • General Physics and Astronomy


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