Evolution of superconductivity in Fe1+yTe1-xSe x annealed in Te vapor

Yue Sun, Yuji Tsuchiya, Tatsuhiro Yamada, Toshihiro Taen, Sunseng Pyon, Zhixiang Shi, Tsuyoshi Tamegai

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


We report a detailed study of the Te vapor annealing effect in Fe 1+yTe0.6Se0.4 single crystals. Bulk superconductivity can be gradually induced by annealing with increasing amount of Te, until the molar ratio of Te to the sample reaches 1:10. By further increasing Te molar ratio, superconducting volume is gradually reduced. Resistivity and Hall effect measurements manifest that annealing in Te vapor delocalizes the charge carriers by removing excess Fe. The optimally Te annealed crystal shows homogeneous critical current densities with a large value of ∼4.3 x 105 A/cm2, which proves that the Te annealing is effective to induce bulk superconductivity in Fe1+yTe 1-xSex.

Original languageEnglish
Article number093705
JournalJournal of the Physical Society of Japan
Issue number9
Publication statusPublished - 2013 Sept


  • Critical current density
  • Excess Fe
  • FeTeSe
  • Hall effect
  • Iron chalcogenide
  • Te annealing effect


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