Abstract
We have fabricated (Ba,K)Fe2As2 and (Sr,K)Fe2As2 superconducting wires through an powder-in-tube (PIT) method using hot isostatic pressing (HIP) technique. The transport critical current densities (Jc) have reached 37kA/cm2 and 48kA/cm2 under self-field, and 3.0kA/cm2 and 1.8kA/cm2 under magnetic field of 90kOe, at 4.2K in the (Ba,K)Fe2As2 and (Sr,K)Fe2As2 wire, respectively. Magneto-optical (MO) imaging of the wires confirmed the large intergranular Jc in the wire core due to the improvement of couplings between superconducting grains by high-pressure annealing.
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