Evolution of tetragonal phase in the FeSe wire fabricated by a novel chemical-transformation PIT process

Hiroki Izawa; Osuke Miura; Toshinori Ozaki; Yoshihiko Takano; Yoshikazu Mizuguchi

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Evolution of tetragonal phase in the FeSe wire fabricated by a novel chemical-transformation PIT process

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arxiv 1106.3891 v1 pith:B6RDCSPD submitted 2011-06-20 cond-mat.supr-con

Hiroki Izawa , Yoshikazu Mizuguchi , Toshinori Ozaki , Yoshihiko Takano , Osuke Miura This is my paper · ORCID

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keywords phaseannealingtetragonalchemical-transformationcircevolutionfabricatedfese

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We fabricated superconducting FeSe wires by the chemical-transformation PIT process. The obvious correlation between annealing temperature and phase transformation was observed. Annealing above 500^{\circ}C produced wire-core transformation from hexagonal to tetragonal phase. Furthermore the hexagonal phase completely transformed into the tetragonal phase by annealing at 1000^{\circ}C. With increasing annealing temperature, the superconducting property was dramatically improved, associated with the evolution of the tetragonal phase.

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