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Investigation of superconductivity in Ce-doped (La,Pr)OBiS2 single crystals

Single crystals of Ce-doped (La,Pr)OBiS2 superconductors, multinary rare-earth elements substituted ROBiS2, were successfully grown. The grown crystals typically had a size of 1-2 mm and a plate-like shape with a well-developed c-plane. The c-axis lattice constants of the obtained (La,Ce,Pr)OBiS2 single crystals were approximately 13.6-13.7 A, and the superconducting transition temperature was 1.23-2.18 K. Valence fluctuations of Ce and Pr were detected through X-ray absorption spectroscopy analysis. In contrast to (Ce,Pr)OBiS2 and (La,Ce)OBiS2, the superconducting transition temperature of (La,Ce,Pr)OBiS2 increased with increasing concentrations of the tetravalent state at the R-site.

preprint2022arXivOpen access
Masanori NagaoYuji HanadaAkira MiuraYuki MaruyamaSatoshi WatauchiYoshihiko TakanoIsao Tanaka
cond-mat.supr-con
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Masanori NagaoYuji HanadaAkira MiuraYuki MaruyamaSatoshi WatauchiYoshihiko TakanoIsao Tanaka

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