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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

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
Volume77
Issue numberSUPPL. C
DOIs
Publication statusPublished - 2008
Externally publishedYes

Keywords

  • Iron oxypnicite superconductors
  • Photoemission spectroscopy
  • Pseudogap

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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