Hot pressing to enhance the transport Jc of Sr0.6K0.4Fe2As2 superconducting tapes

He Lin, Chao Yao, Xianping Zhang, Chiheng Dong, Haitao Zhang, Dongliang Wang, Qianjun Zhang, Yanwei Ma, Satoshi Awaji, Kazuo Watanabe, Huanfang Tian, Jianqi Li

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46 Citations (Scopus)

Abstract

High-performance Sr0.6K0.4Fe2As2 (Sr-122) tapes have been successfully fabricated using hot pressing (HP) process. The effect of HP temperatures (850-925°C) on the c-axis texture, resistivity, Vickers micro-hardness, microstructure and critical current properties has been systematically studied. Taking advantage of high degree of c-axis texture, well grain connectivity and large concentration of strong-pinning defects, we are able to obtain an excellent Jc of 1.2 × 105 A/cm2 at 4.2 K and 10 T for Sr-122 tapes. More importantly, the field dependence of Jc turns out to be very weak, such that in 14 T the Jc still remains,1.0 × 105 A/cm2. These Jc values are the highest ever reported so far for iron-pnictide wires and tapes, achieving the level desired for practical applications. Our results clearly strengthen the position of iron-pnictide conductors as a competitor to the conventional and MgB2 superconductors for high field applications.

Original languageEnglish
Article number6944
JournalScientific reports
Volume4
DOIs
Publication statusPublished - 2014 Nov 6

ASJC Scopus subject areas

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    Lin, H., Yao, C., Zhang, X., Dong, C., Zhang, H., Wang, D., Zhang, Q., Ma, Y., Awaji, S., Watanabe, K., Tian, H., & Li, J. (2014). Hot pressing to enhance the transport Jc of Sr0.6K0.4Fe2As2 superconducting tapes. Scientific reports, 4, [6944]. https://doi.org/10.1038/srep06944