Tailoring the critical current properties in Cu-sheathed Sr1-xKxFe2As2 superconducting tapes

Kaili Lin, Chao Yao, Xianping Zhang, Qianjun Zhang, He Huang, Chen Li, Dongliang Wang, Chiheng Dong, Yanwei Ma, Satoshi Awaji, Kazuo Watanabe

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


Cu is an attractive metal to use as the sheath material for Sr1-xKxFe2As2 superconducting wires. However, unfavorable reactions between the Cu sheath and the superconducting core severely affect the superconducting performance. In this work, Cu-sheathed Sr1-xKxFe2As2 tapes are fabricated at a low temperature of 740 °C using a hot pressing method. A systematic correlation between the sintering holding time, reaction layer, microstructure, and superconducting properties is investigated. It is found that the samples that are hot pressed for 60 min exhibit the highest transport critical current density (J c), i.e. 3.5 × 104 A cm-2 in 10 T and 1.6 × 104 A cm-2 in 26 T at 4.2 K, respectively. Furthermore, the engineering critical current density (J e) value of the samples is over 1.0 × 104 A cm-2 in 10 T at 4.2 K. This is by far the highest J c reported for Cu-sheathed iron-based superconducting tapes.

Original languageEnglish
Article number095006
JournalSuperconductor Science and Technology
Issue number9
Publication statusPublished - 2016 Jul 21


  • critical current density
  • Cu sheath
  • superconducting tapes


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