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We report the successful fabrication of mono- and seven-core superconductingwires of FeSe1-xTex using an in-situ Fe-diffusion process based on thepowder-in-tube (Fe-diffusion PIT) method. The reacted layer in these wires werefound to have composite structure with composition nearly FeSe and FeTe for theinner and outer layers, although a single layer of composition FeSe0.5Te0.5 wassupposed to be formed. The self-field transport Jc values at 4.2 K were foundto be 226.2 A/cm2 and 100.3 A/cm2 respectively for mono- and seven-core wires.The Jc's of mono- and seven-core wires dropped rapidly at low fields and thenshowed a gradual decrease with increasing magnetic fields. In addition, theseven-core wire showed higher Jc than the mono-core wire under higher magneticfields, indicating that the seven-core wire of FeSe1-xTex superconductor usingFe-diffusion PIT method is advantageous for the superconducting-wireapplication under high magnetic fields.

Transport properties and microstructure of mono- and seven-core wires of FeSe1-xTex superconductor by Fe-diffusion powder-in-tube method