Effects of high-pressure sintering on critical current density in (Ba,K)Fe2As2 PIT wires

T. Tamegai, S. Pyon, Y. Tsuchiya, H. Inoue, N. Koizumi, H. Kajitani

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


The effects of high-pressure sintering on the critical current density Jc in superconducting wires of (Ba0.6K0.4)Fe2As2 and (Sr0.6K0.4)Fe2As2 fabricated by the powder-in-tube technique were studied. The high-pressure sintering was conducted using the hot isostatic pressing (HIP) technique in a pressure up to 120 MPa. Local measurements on the magnetic induction distribution of the wire core in the critical state using magnetooptical imaging demonstrate that a uniform shielding current is flowing and intergranular couplings are very strong. Self-field Jc up to 1 × 105 A/cm2 is achieved in wires processed at 120 MPa and 700 °C. A systematic measurement of Jc in HIP-processed (Ba0.6K0.4)Fe2As2 wires demonstrates that Jc increases steadily with the pressure during the high-pressure sintering. On the other hand, the obtained Jc depends sensitively on the temperature during the high-pressure sintering, and the duration of the highpressure sintering also affects the value of Jc.

Original languageEnglish
Article number6985608
JournalIEEE Transactions on Applied Superconductivity
Issue number3
Publication statusPublished - 2015 Jun 1


  • critical current density
  • high-pressure sintering
  • Iron-based superconductor
  • magneto-optical imaging

ASJC Scopus subject areas

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


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