Enhancement of critical current density in a Ca0.85La0.15Fe(As0.92Sb0.08)2 superconductor with Tc = 47 K through 3 MeV proton irradiation

Akiyoshi Park, Akinori Mine, Tatsuhiro Yamada, Fumiaki Ohtake, Hiroki Akiyama, Yue Sun, Sunseng Pyon, Tsuyoshi Tamegai, Yutaka Kitahama, Tasuku Mizukami, Kazutaka Kudo, Minoru Nohara, Hisashi Kitamura

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


We examine the critical current density (Jc) of Ca1-xLaxFe(As1-ySby)2, a 112-type iron-based superconductor (IBS) with Tc = 47 K, via magneto-optical imaging and magnetization measurements. We assert that the large self-field Jc of 2.0 × 106 A cm-2 at 2 K is a strong indication that it is a bulk superconductor with spatially homogeneous superconductivity. A 2.8-fold enhancement in Jc to 6.2 × 106 A cm-2 was achieved through artificially engineering pinning centers by irradiating 3 MeV protons with a total dosage of 1.0 × 1016 cm-2. The results not only demonstrate the potential of 112-type IBSs for application but also enrich the current understanding of the role of artificial defects in IBSs.

Original languageEnglish
Article number055006
JournalSuperconductor Science and Technology
Issue number5
Publication statusPublished - Mar 29 2016


  • critical current density
  • iron-based superconductor
  • magneto-optical imaging
  • particle irradiation

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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