Realization of practical level current densities in Sr0.6K 0.4Fe2As2 tape conductors for high-field applications

Xianping Zhang, Chao Yao, He Lin, Yao Cai, Zhen Chen, Jianqi Li, Chiheng Dong, Qianjun Zhang, Dongliang Wang, Yanwei Ma, Hidetoshi Oguro, Satoshi Awaji, Kazuo Watanabe

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90 Citations (Scopus)

Abstract

122 type pnictide superconductors are of particular interest for high-field applications because of their large upper critical fields Hc2 (> 100 T) and low anisotropy γ (<2). Successful magnet applications require fabrication of polycrystalline superconducting wires that exhibit large critical current density Jc, which is limited by poor grain coupling and weak-link behavior at grain boundaries. Here, we report our recent achievement in the developing Sr0.6K0.4Fe 2As2 tapes with transport Jc up to 0.1 MA/cm2 at 10 T and 4.2 K. This value is by far the highest ever recorded for iron based superconducting wires and has surpassed the threshold for practical application. The synergy effects of enhanced grain connectivity, alleviation of the weak-link behavior at grain boundaries, and the strong intrinsic pinning characteristics led to the superior Jc performance exhibited in our samples. This advanced Jc result opens up the possibility for iron-pnictide superconducting wires to win the race in high-field magnet applications.

Original languageEnglish
Article number202601
JournalApplied Physics Letters
Volume104
Issue number20
DOIs
Publication statusPublished - 2014 May 19

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Zhang, X., Yao, C., Lin, H., Cai, Y., Chen, Z., Li, J., Dong, C., Zhang, Q., Wang, D., Ma, Y., Oguro, H., Awaji, S., & Watanabe, K. (2014). Realization of practical level current densities in Sr0.6K 0.4Fe2As2 tape conductors for high-field applications. Applied Physics Letters, 104(20), [202601]. https://doi.org/10.1063/1.4879557