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The recently discovered iron-based superconductors with very high uppercritical field and small anisotropy have been regarded as a potential candidatematerial for high field applications. However, enhancements of superconductingproperties are still needed to boost the successful use of iron-basedsuperconductors in such applications. Here, we propose a new sheatharchitecture of stainless steel (SS)/Ag double sheath and investigate itsinfluence on the microstructures and Jc-H property. We found that the transportJc-H curves for rolled and pressed tapes both show extremely small magneticfield dependence and exceed 3*10^4A/cm^2 under 28 T, which are much higher thanthose of low-temperature superconductors. More interestingly, 12 cm long rolledtape shows very high homogeneity and sustains Jc as high as 7.7*10^4 A/cm^2 at10 T. These are the highest values reported so far for iron-basedsuperconducting wires fabricated by scalable rolling process. Themicrostructure investigations indicate that such high Jc was achieved by higherdensity of the core and uniform deformation resulting better texturing. Theseresults indicate that our process is very promising for fabricating long Ba122wires for high field magnet, i.e. above 20 T.

High transport Jc in magnetic fields up to 28 T of stainless steel/Ag double sheathed Ba122 tapes fabricated by scalable rolling process