Transport Properties of Iron-Based FeTe0.5Se0.5 Superconducting Wire

FeTe0.5Se0.5 superconducting wires have been fabricated using ex-situ PIT method with an Fe sheath. Among the other FeAs-based superconductors, FeTe0.5Se0.5 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-c(zero)) and transport critical current density (J(c)) at 2K were 3.2 K and 2.8 A/cm(2), respectively. In addition, by annealing at 200 degrees C for 2 h, T-c(zero) 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 FeTe0.5Se0.5 wire were enhanced.