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Bulk superconductivity induced by Se substitution in self-doped BiCh2-based compound CeOBiS2-xSex

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arxiv 2001.07928 v1 pith:PVDM7TEM submitted 2020-01-22 cond-mat.supr-con cond-mat.mtrl-sci

Ryosuke Kiyama , Yosuke Goto , Kazuhisa Hoshi , Rajveer Jha , Akira Miura , Chikako Moriyoshi , Yoshihiro Kuroiwa , Tatsuma D. Matsuda
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Yuji Aoki Yoshikazu Mizuguchi
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classification cond-mat.supr-concond-mat.mtrl-sci
keywords ceobis2-xsexsuperconductivitybich2-basedbulkcompoundconcentrationmeasurementsself-doped
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We report the Se substitution effects on the crystal structure, superconducting properties, and valence states of self-doped BiCh2-based compound CeOBiS2-xSex. Polycrystalline CeOBiS2-xSex samples with x = 0-1.0 were synthesized. For x = 0.4 and 0.6, bulk superconducting transitions with a large shielding volume fraction were observed in magnetic susceptibility measurements; the highest transition temperature (Tc) was 3.0 K for x = 0.6. A superconductivity phase diagram of CeOBiS2-xSex was established based on Tc estimated from the electrical resistivity and magnetization measurements. The emergence of superconductivity in CeOBiS2-xSex was explained with two essential parameters of in-plane chemical pressure and carrier concentration, which systematically changed with increasing Se concentration.

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