Chalcogen (O2, S, Se, Te) atmosphere annealing induced bulk superconductivity in Fe1+yTe1- xSex single crystal

Y. Sun, Y. Tsuchiya, T. Yamada, T. Taen, S. Pyon, Z. X. Shi, T. Tamegai

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

We reported a detailed study of Fe1+yTe 0.6Se0.4 single crystals annealed in the atmosphere of chalcogens (O2, S, Se, Te). After annealing with appropriate amount of chalcogens, Fe1+yTe0.6Se0.4 single crystals show Tc higher than 14 K with a sharp transition width ∼1 K. Critical current density Jc for the annealed crystals reach a very high value ∼2-4 × 105 A/cm2 under zero field, and is also robust under applied field at low temperatures. Magneto-optical imaging reveal that the Jc is homogeneously distributed in the annealed crystals and isotropic in the ab-plane. Our results show that annealing in the atmosphere of chalcogens can successfully induce bulk superconductivity in Fe1+yTe0.6Se 0.4.

Original languageEnglish
Pages (from-to)12-15
Number of pages4
JournalPhysica C: Superconductivity and its Applications
Volume504
DOIs
Publication statusPublished - 2014 Sept 15

Keywords

  • Annealing effect
  • Critical current density
  • Excess Fe
  • Iron chalcogenide
  • Magneto-optical imaging

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