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Bi Substitution Effects on Superconductivity of Valence-Skip superconductor AgSnSe2

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arxiv 1702.01196 v1 pith:ERL7NNVS submitted 2017-02-03 cond-mat.supr-con

Yudai Hijikata , Atsuhiro Nishida , Kohei Nagasaka , Osuke Miura , Akira Miura , Chikako Moriyoshi , Yoshihiro Kuroiwa , Yoshikazu Mizuguchi This is my paper · ORCID
classification cond-mat.supr-con
keywords superconductivityvalence-skipagsnse2substitutionagsn1-xbixse2statessuperconductorabove
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We have synthesized AgSn1-xBixSe2 polycrystalline samples to investigate the effect of partial substitution of mixed-valence Sn by Bi3+ to the superconductivity of the valence-skip superconductor AgSnSe2. The Bi-substituted AgSn1-xBixSe2 were obtained up to x = 0.2, but an insulating phase Ag2SnBi2Se5 with a NaCl-type structure showed up above x = 0.3. The superconducting transition temperature increased from 4.5 K (x = 0) to 5.0 K (x = 0.1) by Bi substitution. The enhancement of superconductivity by the suppression of the valence-skip states of Sn suggests that the valence-skip states of Sn are not positively linked to the pairing mechanisms of superconductivity in the AgSnSe2 system.

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