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We fabricated single- and 3-core superconducting Fe-Se wires using a novelprocess based on a chemical transformation from hexagonal FeSe1+d(non-superconducting) to tetragonal FeSe (superconducting) via an optimalsupply of Fe from the Fe sheath by annealing. This process enhanced a packingdensity of superconducting core inside the sheath, owing to an expansion of thelattice volume via a chemical transformation from high-density hexagonalFeSe1+d to low-density tetragonal FeSe. The obtained superconducting wireshowed superconductivity below ~10 K and the upper critical field was estimatedto be 19.3 T at 0 K. The obtained transport critical current densities at 0 Twere 588 A/cm2 for the 3-core wire and 218 A/cm2 for the single-core wire.

Transport properties of the single- and 3-core Fe-Se wires fabricated by a novel chemical-transformation PIT process