Phase diagram and oxygen annealing effect of FeTe 1-xSe x iron-based superconductor

Yasuna Kawasaki, Keita Deguchi, Satoshi Demura, Tohru Watanabe, Hiroyuki Okazaki, Toshinori Ozaki, Takahide Yamaguchi, Hiroyuki Takeya, Yoshihiko Takano

Research output: Contribution to journalArticlepeer-review

64 Citations (Scopus)


Phase diagrams of as-grown and O 2-annealed FeTe 1-xSe x determined from magnetic susceptibility measurement were obtained. For as-grown samples, the antiferromagnetic order was fully suppressed in the range region x≥0.15, and weak superconductivity appeared when x≥0.1. Beginning at x=0.5, weak superconductivity was found to evolve into bulk superconductivity. Interestingly, for O 2-annealed samples, complete suppression of magnetic order and the occurrence of bulk superconductivity were observed when x≥0.1. We found that O 2-annealing induces bulk superconductivity for FeTe 1-xSe x. Oxygen probably plays a key role in the suppression of the magnetic order and the appearance of bulk superconductivity.

Original languageEnglish
Pages (from-to)1135-1138
Number of pages4
JournalSolid State Communications
Issue number13
Publication statusPublished - Jul 2012
Externally publishedYes


  • A. FeTe Se
  • B. O -annealing
  • D. Magnetization


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