文章基本信息

标题：Achievement of practical level critical current densities in Ba_1−xK_xFe₂As₂/Ag tapes by conventional cold mechanical deformation
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作者：Zhaoshun Gao ; Kazumasa Togano ; Akiyoshi Matsumoto 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2014
卷号：4
DOI：10.1038/srep04065
出版社：Springer Nature
摘要：The recently discovered iron-based superconductors are potential candidates for high-field magnet applications. However, the critical current densities ( J_c ) of iron-based superconducting wires remain far below the level needed for practical applications. Here, we show that the transport J_c of Ba_1−xK_xFe₂As₂/Ag tapes is significantly enhanced by the combination process of cold flat rolling and uniaxial pressing. At 4.2 K, J_c exceeds the practical level of 10⁵ A/cm² in magnetic fields up to 6 T. The J_c-H curve shows extremely small magnetic field dependence and maintains a high value of 8.6 × 10⁴ A/cm² in 10 T. These are the highest values reported so far for iron-based superconducting wires. Hardness measurements and microstructure investigations reveal that the superior J_c in our samples is due to the high core density, more textured grains, and a change in the microcrack structure. These results indicate that iron-based superconductors are very promising for high magnetic field applications.