2014/12/03 by Zhaoshun Gao, Kazumasa Togano, K. Togano +3 · 1 citation
Materials Science · Physics and Astronomy · #Anisotropy #Composite material #Computer science #Condensed matter physics #Critical field #Electrical engineering #Homogeneity (statistics) #Iron-based superconductors research #Magnet #Magnetic field #Materials science #Microstructure #Optics #Physics #Physics of Superconductivity and Magnetism #Superconductivity #Superconductivity in MgB2 and Alloys #cond-mat.supr-con
paper · pdf · doi:10.1088/0953-2048/28/1/012001
published as Supercond. Sci. Technol. 28,012001 (2015) · 19 pages, 6 figures
openalex publication_date 2014/12/03 · arxiv created 2014/12/04 · arxiv updated 2014/12/05 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The recently discovered iron-based superconductors with very high upper critical field ( H c2 ) 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 J c -H property. We found that the transport J c -H curves for rolled and pressed tapes both show extremely small magnetic field dependence and exceed 3 × 10 4 A 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 J c 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 J c 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.