Effects of high-pressure sintering on critical current density in Co-doped BaFe2As2 wires

•A Ba(Fe,Co)2As2 superconducting wire was fabricated by powder-in-tube method.•The wire was conducted on high pressure sintering or flat rolling to make it tape.•Jc of a wire, a tape and a high pressure sinetered wire were 3.7 × 103, 7.4 × 103 and 7.8 × 103 A/cm2.•MO imaging of these wires was measured.

We demonstrate that critical current density (Jc) in Ba(Fe,Co)2As2 superconducting wires is enhanced by high-pressure processes, such as hot isostatic pressing (HIP) or texturing by uniaxial pressure. These superconducting wires have been fabricated by ex situ powder-in-tube (PIT) method. Transport Jc at T = 4.2 K under self-field of the textured tape (0.4 mm thick) and HIP processed wire is 9.2 kA/cm2 and 7.8 kA/cm2, respectively. We have also observed magneto-optical images of the wire and demonstrated that the high-pressure treatment contributed to generate strong links between superconducting grains and enhance Jc.