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We report large transport critical current densities observed in Ag-added(Ba,K)Fe2As2 superconducting wires prepared by an ex-situ powder-in-tube (PIT)process. The wire has a simple composite structure sheathed only by Ag. Aprecursor bulk material prepared by a melting process was ground into powderand put into a Ag tube. The composite was then cold worked into a wire and heattreated at 850$^\circ$C for sintering. Transport critical current densities,Jc, at 4.2 K are 1.0\times104 A/cm2 (Ic = 60.7 A) in self field and1.1\times103 A/cm2 (Ic = 6.6 A) in 10 T. These are the highest values reportedso far for the Fe-based superconducting wires.

applied physics express

Large Transport Critical Current Densities of Ag Sheathed  (Ba,K)Fe2As2+Ag Superconducting Wires Fabricated by an ex-situ Powder-in-Tube  (PIT) Process