High magnetic field properties of Ba122 tapes by conventional cold mechanical deformation

High magnetic field properties of Ba122 tapes by conventional cold mechanical deformation

高 召順, 戸叶 一正, 松本 明善, 熊倉 浩明 （NIMS）

Abstract:The recently discovered iron-based superconductors are one of potentialcandidate materials for application to generate high magnetic field. Recently we succeeded in the improvement of microstructure andJc properties of Ba122 tapes. We found that the transport Jc-H curve shows extremely small magnetic field dependence and maintains a high value of 4.3×104A/cm2 in 28 T at 4.2 K for cold uniaxial pressed sample. More interestingly, even the as rolled tape still sustains Jc as high as 3.2×104 A/cm2 at 28 T. This is the highest value reported so far foriron-based superconducting wires without pressing. These resultsindicate that our process is very promising for fabricating long 122wires for high field magnet, i.e. above 20 T.

2014年春季低温工学・超電導学会