Transport properties of iron-based FeTe0.5Se0.5 superconducting wire

— FeTe 0.5 Se 0.5 superconducting wires have been fabricated using ex-situ PIT method with an Fe sheath. Among the other FeAs-based superconductors, FeTe 0.5 Se 0.5 has great advantage for applications due to its binary composition and less toxicity. Surprisingly, superconducting current was observed in the as-fabricated wire without any heat treatments. The zero-resistivity critical temperature ( T czero ) and transport critical current density ( J c ) at 2 K were 3.2 K and 2.8 A/cm 2 , respectively. In addition, by annealing at 200 º C for 2 h, T czero and J c were enhanced up to 9.1 K, and 64.1 A/cm 2 , respectively. This suggests that the inter-grain connectivity was improved by heat treatment, and superconducting properties of FeTe 0.5 Se 0.5 wire were enhanced. ,