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

Abstract

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

17 pages, 4 figures

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Cited by in corpus (8)

• Recent advances in iron-based superconductors toward applications
• Progress in wire fabrication of iron-based superconductors
• Thin Film Growth and Device Fabrication of Iron-Based Superconductors
• Fabrication and transport properties of Sr0.6K0.4Fe2As2 multifilamentary superconducting wires
• Magneto-optical imaging and transport properties of FeSe superconducting tapes prepared by diffusion method
• Enhancement of superconducting properties in FeSe wires using a quenching technique
• Crystal structure instability of FeSe grains: Formation of non-superconducting phase at the grain surface
• Evolution of tetragonal phase in the FeSe wire fabricated by a novel chemical-transformation PIT process