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(Ba,K)Fe2As2 superconducting wires and tapes are fabricated by using hotisostatic pressing (HIP) technique, and their superconducting properties arestudied. In the HIP round wire, transport critical current density (Jc) at 4.2K has achieved record-high value of 175 kA/cm2 at zero field, and exceeds 20kA/cm2 even at 100 kOe. Improvement of polycrystalline powder synthesis mayplay a key role for the enhancement of Jc. In the HIP tape, even largertransport Jc of 380 kA/cm2 is realized at zero field. Based on magnetizationand magneto-optical measurements, possible further enhancement of Jc isdiscussed.

Enhancement of critical current densities in (Ba,K)Fe2As2 wires and tapes using HIP technique