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 journalArticle

4 Citations (Scopus)

Abstract

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
JournalPhysica C: Superconductivity and its Applications
Volume470
Issue numberSUPPL.1
DOIs
Publication statusPublished - 2010 Dec
Externally publishedYes

Fingerprint

Rare earths
Superconducting materials
critical current
Iron
current density
Imaging techniques
iron
inhomogeneity
rare earth elements
grain size
Iron-based Superconductors

Keywords

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

ASJC Scopus subject areas

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

Cite this

Magneto-optical imaging of iron-oxypnictide superconductor LaFeAs(O,F). / Nakajima, Yasuyuki; Maruoka, Toshihide; Tamegai, Tsuyoshi; Kamihara, Yoichi; Hirano, Masahiro; Hosono, Hideo.

In: Physica C: Superconductivity and its Applications, Vol. 470, No. SUPPL.1, 12.2010.

Research output: Contribution to journalArticle

Nakajima, Yasuyuki ; Maruoka, Toshihide ; Tamegai, Tsuyoshi ; Kamihara, Yoichi ; Hirano, Masahiro ; Hosono, Hideo. / Magneto-optical imaging of iron-oxypnictide superconductor LaFeAs(O,F). In: Physica C: Superconductivity and its Applications. 2010 ; Vol. 470, No. SUPPL.1.
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