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We demonstrate a large enhancement of critical current density (Jc) up to1.0x10^7 A/cm2 at 5 K under self-field in (Ba,K)Fe2As2 single crystals byirradiating 320 MeV Au ions. With the very promising potential of this materialin mind, we have fabricated a (Ba,K)Fe2As2 superconducting wire through apowder-in-tube method combined with the hot isostatic pressing technique, whoseeffectiveness has been proven in industrial Bi2223 tapes. The Jc in the wire at4.2 K has reached 37 kA/cm2 under self-field and 3.0 kA/cm2 at 90 kOe.Magneto-optical imaging of the wire confirmed the large intergranular Jc in thewire core.

Enhancement of Critical Current Densities in (Ba,K)Fe2As2 by 320 MeV Au Irradiation in Single Crystals and by High-Pressure Sintering in PIT Wires