Transport Critical Current Density of $hbox{Sr}_{0.6}hbox{K}_{0.4}hbox{Fe}_{2}hbox{As}_{2}hbox{/}hbox{Ag}$ Superconducting Tapes Processed by Flat Rolling and Uniaxial Pressing

摘要

Ag-sheathed superconducting tapes with various thicknesses were produced by flat rolling and cold uniaxial pressing based on an powder-in-tube method. The transport critical current density ( ) for both rolled and pressed tapes was found to increase with the decrease of tape thickness. Compared with flat rolling, cold pressing can further enhance the transport of tapes. A transport as high as at 4.2 K and 10 T was achieved by pressing tapes at about 1.0 GPa. This superior transport in the pressed tapes can be ascribed to improved mass density and grain texture of superconducting cores.