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Flux Growth and Superconducting Properties of (Ce,Pr)OBiS2 Single Crystals.

ABSTRACT: Ce1-x Pr x OBiS2 (0. 1 ? x ? 0.9) single crystals were grown using a CsCl flux method. Their structural and physical properties were examined by X-ray diffraction, X-ray absorption, transmission electron microscopy, and electrical resistivity. All of the Ce1-x Pr x OBiS2 single crystals with 0.1 ? x ? 0.9 exhibited tetragonal phase. With increasing Pr content, the a-axis and c-axis lattice parameters decreased and increased, respectively. Transmission electron microscope analysis of Ce0.1Pr0.9OBiS2 (x = 0.9) single crystal showed no stacking faults. Atomic-resolution energy dispersive X-ray spectrometry mapping revealed that Bi, Ce/Pr, O, and S occupied different crystallographic sites, while Ce and Pr randomly occupied the same sites. X-ray absorption spectra showed that an increase of the Pr ratio increased the ratio of Ce4+/Ce3+. All of the Ce1-x Pr x OBiS2 crystals showed superconducting transition, with a maximum transition temperature of ~4 K at x = 0.9.

SUBMITTER: Nagao M 

PROVIDER: S-EPMC7010857 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature

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Ce<sub>1-<i>x</i></sub> Pr <sub><i>x</i></sub> OBiS<sub>2</sub> (0. 1 ≤ <i>x</i> ≤ 0.9) single crystals were grown using a CsCl flux method. Their structural and physical properties were examined by X-ray diffraction, X-ray absorption, transmission electron microscopy, and electrical resistivity. All of the Ce<sub>1-<i>x</i></sub> Pr <sub><i>x</i></sub> OBiS<sub>2</sub> single crystals with 0.1 ≤ <i>x</i> ≤ 0.9 exhibited tetragonal phase. With increasing Pr content, the <i>a</i>-axis and <i>c</i  ...[more]

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