Large transport critical currents of powder-in-tube Sr0.6K0.4Fe2As2/Ag superconducting wires and tapes

Lei Wang, Yanpeng Qi, Dongliang Wang, Xianping Zhang, Zhaoshun Gao, Zhiyu Zhang, Yanwei Ma, Satoshi Awaji, Gen Nishijima, Kazuo Watanabe

Research output: Contribution to journalArticlepeer-review

65 Citations (Scopus)


We report the achievement of transport critical currents in Sr0.6K0.4Fe2As2 wires and tapes with a Tc = 34 K. The wires and tapes were fabricated through an in situ powder-in-tube process. Silver was used as a chemical addition as well as a sheath material. All the wire and tape samples have shown the ability to transport superconducting current. Critical current density Jc was enhanced upon silver addition, and at 4.2 K, a largest Jc of ∼1200 A/cm2 (Ic = 9 A) was achieved for 20% silver added tapes, which is the highest in iron-based wires and tapes so far. The Jc is almost field independent between 1 T and 10 T, exhibiting a strong vortex pinning. Such a high transport critical current density is attributed to the weak reaction between the silver sheath and the superconducting core, as well as an improved connectivity between grains. We also identify a weak-link behavior from the apparent drop of Jc at low fields and a hysteretic phenomenon. Finally, we found that compared to Fe, Ta and Nb tubes, Ag was the best sheath material for the fabrication of high-performance 122 type pnictide wires and tapes.

Original languageEnglish
Pages (from-to)183-186
Number of pages4
JournalPhysica C: Superconductivity and its applications
Issue number2
Publication statusPublished - 2010 Jan 15


  • Iron-based superconductor
  • Superconducting wire
  • Transport critical current

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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