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: ジャーナルへの寄稿記事査読

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.

本文言語英語
論文番号055002
ジャーナルSuperconductor Science and Technology
26
5
DOI
出版ステータス出版済み - 5月 2013
外部発表はい

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