Microstructure and transport properties of ex-situ Powder-in-tube processed FeTe0.5Se0.5 superconducting wire
We fabricated FeTe0.5Se0.5 superconducting wires using ex-situ Powder-in-tube method with an Fe sheath. It was amazing that superconducting current was observed in the as-drawn wire without any heat treatments. By heat treatment at 200\degC for 2 h, Tczero and Jc at 4.2 K were enhanced up to 9.1 K and 64.1 A/cm2, respectively. Furthermore, The Jc of FeTe0.5Se0.5 wire heat treated at 200\degC for 2 h was not much sensitive to the applied magnetic fields. Therefore, FeTe0.5Se0.5 wires have a great potential for applications.