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

    研究成果: Article査読

    12 被引用数 (Scopus)

    抄録

    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.

    本文言語English
    論文番号055002
    ジャーナルSuperconductor Science and Technology
    26
    5
    DOI
    出版ステータスPublished - 2013 5月

    ASJC Scopus subject areas

    • セラミックおよび複合材料
    • 凝縮系物理学
    • 金属および合金
    • 電子工学および電気工学
    • 材料化学

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