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Large transport critical currents and magneto-optical imaging of textured Sr<sub>1−<i>x</i></sub>K<sub><i>x</i></sub>Fe<sub>2</sub>As<sub>2</sub>superconducting tapes
We report the temperature dependence of the transport critical current density (Jc) in textured Sr1−xKxFe2As2/Fe (Sr122) tapes fabricated by an ex situ powder-in-tube process. Critical currents were measured in magnetic fields in the range 0–15 T and/or the temperature range 4.2–30 K by using a dc four-probe method. It was …