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We demonstrate the fabrication of superconducting SmFeAsO1-xFx (Sm-1111)wires by using the ex-situ powder-in-tube technique. Sm-1111 powder and abinder composed of SmF3, samarium arsenide, and iron arsenide were used tosynthesize the superconducting core. Although the F content of Sm-1111 isreduced in the process of ex-situ fabrication, the binder compensates bysufficiently supplementing the F content, thereby preventing a decrease in thesuperconducting transition temperature and a shrinking of the superconductingvolume fraction. Thus, in the superconducting Sm-1111 wire with the binder, thetransport critical current density reaches the highest value of ~4000 A/cm2 at4.2 K.

Analysis of interdiffusion between SmFeAsO0.92F0.08 and metals for ex situ fabrication of superconducting wire