Achievement of practical level critical current densities in Ba1−xKxFe2As2/Ag tapes by conventional cold mechanical deformation

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...

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Bibliographic Details
Published in:Scientific reports 2014-02, Vol.4 (1), p.4065-4065
Main Authors: Gao, Zhaoshun, Togano, Kazumasa, Matsumoto, Akiyoshi, Kumakura, Hiroaki
Format: Article
Language:English
Subjects:
639/301/119/1003
639/766/25
Humanities and Social Sciences
Iron
Magnetic fields
multidisciplinary
Science
Superconductors
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Summary: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−x K x Fe 2 As 2 /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 10 5  A/cm 2 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 × 10 4  A/cm 2 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.
ISSN:2045-2322
DOI:10.1038/srep04065