Physics – Condensed Matter – Superconductivity
Scientific paper
2011-06-17
Supercond. Sci. Technol. 24, 125003 (2011)
Physics
Condensed Matter
Superconductivity
17 pages, 4 figures
Scientific paper
10.1088/0953-2048/24/12/125003
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.
Izawa Hiroki
Miura Osuke
Mizuguchi Yoshikazu
Ozaki Toshinori
Takano Yoshihiko
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