Evolution of superconductivity in isovalent Te-substituted K xFe2-ySe2 crystals

Toshinori Ozaki, Hiroyuki Takeya, Keita Deguchi, Satoshi Demura, Hiroshi Hara, Tohru Watanabe, Saleem James Denholme, Hiroyuki Okazaki, Masaya Fujioka, Yoshiko Yokota, Takahide Yamaguchi, Yoshihiko Takano

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    12 Citations (Scopus)


    We report the evolution of superconductivity and the phase diagram of the KxFe2-ySe2-zTez (z = 0-0.6) crystals grown by a one-step synthesis. The one-step synthesis is much simpler than a conventional process to grow the KxFe2-ySe2 system. No structural transition is observed in any crystals, while lattice parameters exhibit a systematic expansion with increasing Te content. The T c exhibits a gradual decrease with increasing Te content from K at z = 0 to K at z = 0.5, followed by a sudden suppression of superconductivity at z = 0.6. Upon approaching a Te concentration of 0.6, the shielding volume fraction decreases and eventually drops to zero. Simultaneously, hump positions in the ρ-T curve shift to lower temperatures. These results suggest that isovalent substitution of Te for Se in KxFe2-ySe2 crystals suppresses the superconductivity in this system.

    Original languageEnglish
    Article number055002
    JournalSuperconductor Science and Technology
    Issue number5
    Publication statusPublished - 2013 May 1

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Condensed Matter Physics
    • Metals and Alloys
    • Electrical and Electronic Engineering
    • Materials Chemistry

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    Ozaki, T., Takeya, H., Deguchi, K., Demura, S., Hara, H., Watanabe, T., James Denholme, S., Okazaki, H., Fujioka, M., Yokota, Y., Yamaguchi, T., & Takano, Y. (2013). Evolution of superconductivity in isovalent Te-substituted K xFe2-ySe2 crystals. Superconductor Science and Technology, 26(5), [055002]. https://doi.org/10.1088/0953-2048/26/5/055002