Enhancement of critical current densities in (Ba,K)Fe₂As₂wires and tapes using HIP technique

Abstract

(Ba,K)Fe2As2 superconducting wires and tapes are fabricated by using hot\nisostatic pressing (HIP) technique, and their superconducting properties are\nstudied. In the HIP round wire, transport critical current density (Jc) at 4.2\nK has achieved record-high value of 175 kA/cm2 at zero field, and exceeds 20\nkA/cm2 even at 100 kOe. Improvement of polycrystalline powder synthesis may\nplay a key role for the enhancement of Jc. In the HIP tape, even larger\ntransport Jc of 380 kA/cm2 is realized at zero field. Based on magnetization\nand magneto-optical measurements, possible further enhancement of Jc is\ndiscussed.\n