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FeTe0.5Se0.5 superconducting wires have been fabricated using ex-situ PITmethod with an Fe sheath. Among the other FeAs-based superconductor,FeTe0.5Se0.5 has great advantage for application due to binary composition andless toxic. Surprisingly, superconducting current was observed in theas-fabricated wire without any heat treatments. Zero resistivity and transportcritical current density (Jc) were 3.2 K and 2.8 A/cm2, respectively. Inaddition, by annealing at 200 degC for 2 h, critical temperature Tczero and Jcwere enhanced up to 9.1 K, and 64.1 A/cm2, respectively. This suggests that thegrain connectivity was improved by heat treatment, and superconducting propertyof FeTe0.5Se0.5 wire was enhanced.

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