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We report the temperature dependence of the transport critical currentdensity (Jc) in textured Sr1-xKxFe2As2/Fe (Sr122) tapes fabricated by an exsitu powder-in-tube process. Critical currents were measured in magnetic fieldsup to 0-15 T and/or the temperature range 4.2-30 K by using a dc four-probemethod. It was found that textured Sr122 tapes heat-treated at low temperaturesshowed higher transport Jc performance due to much improved intergrainconnections. At temperatures of 20 K, easily obtained using a cryocooler, Jcreached ~ 10^4 A/cm^2 in self field, which is the highest transport value offerropnictide wires and tapes reported so far. Magneto-optical imagingobservations further revealed significant and well distributed global Jc at 20K in our tapes. These results demonstrate that 122 type superconducting tapesare promising for high-field applications at around 20 K.

Large transport critical currents and magneto-optical imaging of textured Sr1-xKxFe2As2 superconducting tapes