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Fe-clad BaxK1-xFe2As2 superconducting tapes were fabricated by the ex situpowder-in-tube method combined with a short high-temperature annealingtechnique. The effect of annealing time and different dopants on the transportproperties of the BaxK1-xFe2As2 tapes were systematically studied. By co-dopingwith Ag and Pb, the transport critical current density Jc of BaxK1-xFe2As2tapes was significantly improved in whole field region and the highesttransport Jc was up to 1.4x10^4 A/cm^2 (Ic=100 A) at 4.2K in self field. It isproposed that the superior Jc in the co-doped samples are due to the combineeffect of Pb doping at low fields and Ag doping at high fields.

Improved transport critical currents in Ag and Pb co-doped BaxK1-xFe2As2 superconducting tapes