Investigation of superconductivity in Ce-doped (La,Pr)OBiS2 single crystals
Masanori Nagao, Yuji Hanada, Akira Miura, Yuki Maruyama, Satoshi, Watauchi, Yoshihiko Takano, Isao Tanaka
TL;DR
This study reports the successful growth and characterization of Ce-doped (La,Pr)OBiS2 single crystals, revealing how Ce valence fluctuations influence their superconducting transition temperatures.
Contribution
It introduces a new method for synthesizing Ce-doped (La,Pr)OBiS2 crystals and demonstrates the effect of Ce valence states on superconductivity.
Findings
Crystals grown with sizes of 1-2 mm and well-defined c-plane.
Superconducting transition temperatures ranged from 1.23 to 2.18 K.
Superconductivity increased with higher tetravalent Ce concentration.
Abstract
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.
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