Enhancement of critical current densities by high-pressure sintering in (Sr,K)Fe2As2 PIT wires

Sunseng Pyon, Yuji Tsuchiya, Hiroshi Inoue, Hideki Kajitani, Norikiyo Koizumi, Satoshi Awaji, Kazuo Watanabe, Tsuyoshi Tamegai

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)


We have fabricated (Sr,K)Fe2As2 superconducting wire through a powder-in-tube method that is combined with a hot isostatic pressing technique. The transport J c in the wire at 4.2 K has reached 1.0 × 105 A cm-2 under self-field, and 9.4 × 10 3 A cm-2 at 100 kOe. This is the first report that the transport Jc reaches 1 × 105 A cm-2 in a (Sr,K)Fe2As2 round wire. Magneto-optical imaging of the wire has confirmed the large intergranular critical current density in the wire core. The microstructure and compositional analyses imply that there is room for improvement of the Jc value through the optimization of the wire fabrication process.

Original languageEnglish
Article number095002
JournalSuperconductor Science and Technology
Issue number9
Publication statusPublished - 2014 Sept 1


  • (Sr,K)Fe2As2
  • critical current density
  • hot isostatic pressing
  • magneto-optical imaging
  • powder in tube (PIT)
  • superconducting wires


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