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标题：Hot pressing to enhance the transport Jc of Sr0.6K0.4Fe2As2 superconducting tapes
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作者：He Lin ; Chao Yao ; Xianping Zhang 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：4
期号：1
DOI：10.1038/srep06944
语种：English
出版社：Springer Nature
摘要：High-performance Sr_0.6K_0.4Fe₂As₂ (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 J _c of 1.2 × 10⁵ A/cm² at 4.2 K and 10 T for Sr-122 tapes. More importantly, the field dependence of J _c turns out to be very weak, such that in 14 T the J _c still remains ~ 1.0 × 10⁵ A/cm². These J _c 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.