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Nowadays the development of high-field magnets strongly relies on theperformance of superconducting materials. Iron-based superconductors exhibithigh upper critical fields and low electromagnetic anisotropy, making themparticularly attractive for high-field applications, especially in particleaccelerator magnets, nuclear magnetic resonance spectrometers, medical magneticresonance imaging systems and nuclear fusion reactors. Herein, through anindustrially scalable and cost-effective manufacturing strategy, a practicallevel critical current density up to 1.1x10^5 A/cm2 at 4.2 K in an externalmagnetic field of 10 T was achieved in Cu/Ag composite sheathed Ba0.6K0.4Fe2As2superconducting tapes. The preparation strategy combines flat rolling to inducegrain texture and a subsequent hot-isostatic-pressing densification. By varyingthe parameters of rolling, the degree of grain texture was engineered. It isfound that the transport properties of the Ba1-xKxFe2As2 tapes can be enhancedby applying a large amount of deformation during rolling, which can beattributed to the improved degree of c-axis texture. Microstructurecharacterizations on the highest-performance tape demonstrate that theBa1-xKxFe2As2 phase has a uniform element distribution and small grains withgood connectivity. Grain boundary pinning is consequently enhanced as proved bylarge currents circulating through the sample even at 25 K. Our work provesthat Cu/Ag composite sheathed Ba1-xKxFe2As2 superconducting tapes can be apromising competitor for practical high-field applications in terms of theviable, scalable and cost-effective fabrication strategy applied and the hightransport properties achieved in this work.

High-performance Ba1-xKxFe2As2 superconducting tapes with grain texture engineered via a scalable and cost-effective fabrication