Magneto-optical imaging of iron-oxypnictide superconductor LaFeAs(O,F)

Yasuyuki Nakajima, Toshihide Maruoka, Tsuyoshi Tamegai, Yoichi Kamihara, Masahiro Hirano, Hideo Hosono

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


We report the magneto-optical imaging for polycrystalline LaFeAsO 0.95F0.05 and LaFeAsO0.892F0.108. We find a significant magneto-optical contrast with marked inhomogeneities and with a typical superconducting grain size ∼20-40 μm. Although intergrain critical current density is negligibly small, intragrain critical current density obtained from magneto-optical image is about 1 × 105 A/cm2 at 5 K, which is smaller than other rare-earth-based iron-oxypnictide superconductors but is potentially attractive for technological applications.

Original languageEnglish
Pages (from-to)S406-S407
JournalPhysica C: Superconductivity and its applications
Issue numberSUPPL.1
Publication statusPublished - 2010 Dec
Externally publishedYes


  • Critical current density
  • Iron-oxypnictides
  • Magneto-optical imaging

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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