Abstract
We fabricated single- and three-core superconducting FeSe wires bya novel process based on a chemical transformation from hexagonalFeSe1 + d (non-superconducting) to tetragonal FeSe (superconducting) via an optimalsupply of Fe from the Fe sheath by annealing. This process enhanced thepacking density of the core inside the sheath, owing to an expansion oflattice volume via a chemical transformation from high-density hexagonalFeSe1 + d to low-density tetragonal FeSe. The obtained wire showed superconductivity below ∼ 10 K and the obtained transport critical current densities at 0 T and 4.2 K were 588 A cm − 2 for the three-corewire and 218 A cm − 2 for the single-core wire.
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