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Evolution of superconductivity in isovalent Te-substituted KxFe2-ySe2 crystals

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arxiv 1209.2002 v4 pith:OHU363NZ submitted 2012-09-10 cond-mat.supr-con

Toshinori Ozaki , Hiroyuki Takeya , Keita Deguchi , Satoshi Demura , Hiroshi Hara , Tohru Watanabe , Denholme Saleem James , Hiroyuki Okazaki
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Masaya Fujioka Takahide Yamaguchi Yoshihiko Takano
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classification cond-mat.supr-con
keywords crystalssuperconductivitycontentevolutionisovalentkxfe2-yse2tconsetapproaching
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We report the evolution of superconductivity and the phase diagram of the KxFe2-ySe2-zTez (z=0-0.6) crystals grown by a simple one-step synthesis. No structural transition is observed in any crystals, while lattice parameters exhibit a systematic expansion with Te content. The Tc exhibits a gradual decrease with increasing Te content from Tconset = 32.9 K at z = 0 to Tconset = 27.9 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 r-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.

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