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

TL;DR

This study demonstrates that stainless steel/Ag double sheath Ba122 superconducting tapes fabricated by scalable rolling exhibit record high transport critical current densities in magnetic fields up to 28 T, suitable for high-field magnet applications.

Contribution

Introduces a new stainless steel/Ag double sheath architecture that significantly enhances the microstructure and superconducting performance of Ba122 tapes produced by scalable rolling.

Findings

Achieved Jc over 3×10^4 A/cm^2 at 28 T, surpassing previous records.

Demonstrated high homogeneity and Jc of 7.7×10^4 A/cm^2 at 10 T in long tapes.

Microstructure analysis linked high Jc to higher density and uniform deformation.

Abstract

The recently discovered iron-based superconductors with very high upper critical field and small anisotropy have been regarded as a potential candidate material for high field applications. However, enhancements of superconducting properties are still needed to boost the successful use of iron-based superconductors in such applications. Here, we propose a new sheath architecture of stainless steel (SS)/Ag double sheath and investigate its influence on the microstructures and Jc-H property. We found that the transport Jc-H curves for rolled and pressed tapes both show extremely small magnetic field dependence and exceed 3*10^4A/cm^2 under 28 T, which are much higher than those of low-temperature superconductors. More interestingly, 12 cm long rolled tape shows very high homogeneity and sustains Jc as high as 7.7*10^4 A/cm^2 at 10 T. These are the highest values reported so far for iron-based superconducting wires fabricated by scalable rolling process. The microstructure investigations indicate that such high Jc was achieved by higher density of the core and uniform deformation resulting better texturing. These results indicate that our process is very promising for fabricating long Ba122 wires for high field magnet, i.e. above 20 T.