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We found that the transport Jc of the ex-situ PIT processed (Ba,K)Fe2As2(Ba-122) wire with single Ag sheath can be significantly enhanced by repeatingthe combined process of rolling and heat treatment. The transport Jc (4.2 K and10 T) of 4.4 x 103 A/cm2 (Ic =15.7 A) was obtained for a thin tape of 0.3 mm inthickness, which is the highest value reported so far for the PIT processed 122wires and tapes with a Ag sheath and processed by a conventional route. Themeasurement by a hybrid magnet showed that Jc-H curve maintains very smallfield dependence up to the strong magnetic field of 28 T as expected from thepreviously reported high Hc2 value. The core of the thin tape shows dense grainstructure with less cracks and voids and indicates the development of c-axisalignment, although it is still incomplete. The researches to elucidate theorigin of Jc enhancement and to have further improvement of transport Jc arenow ongoing. The process is simple using a Ag single sheath and, therefore,more realistic technique for long length wire production.

Enhanced high-field transport critical current densities observed for the ex-situ PIT processed Ag/(Ba,K)Fe2As2 thin tapes