High transport critical current densities in textured Fe-sheathed Sr1-xKxFe2As2+Sn superconducting tapes

摘要

We report the realization of grain alignment in Sn-added Sr1-xKxFe2As2superconducting tapes prepared by ex-situ powder-in-tube method. At 4.2 K, hightransport critical current densities Jc of 2.5x10^4 A/cm^2 (Ic = 180 A) inself-field and 3.5x10^3 A/cm^2 (Ic = 25.5 A) in 10 T have been measured. Thesevalues are the highest ever reported so far for Fe-based superconducting wiresand tapes. We believe the superior Jc in our tape samples are due to welltextured grains and strengthened intergrain coupling achieved by Sn addition.Our results demonstrated an encouraging prospect for application of iron basedsuperconductors.