Abstract
Eu0.5La0.5FBiS2-xSex is a new BiS2-based superconductor system. In Eu0.5La0.5FBiS2-xSex, electron carriers are doped to the BiS2 layer by the substitution of Eu by La. Bulk superconductivity in this system is induced by increasing the in-plane chemical pressure, which is controlled by the Se concentration (x). In this study, we have analysed the crystal structure of Eu0.5La0.5FBiS2-xSex using synchrotron powder diffraction and the Rietveld refinement. The precise determination of the structural parameters and thermal factors suggest that the emergence of bulk superconductivity in Eu0.5La0.5FBiS2-xSex is achieved by the enhanced in-plane chemical pressure and the decrease in in-plane disorder.
Highlights
The BiS2-based superconductors have been drawing much attention as a new layered superconductor family [1,2,3]
The superconducting transitions are observed in LaO1-xFxBiS2 when electron carriers were doped by substitution of F for O, bulk superconductivity never appears while filamentary superconductivity with a small shielding volume fraction is observed
From powder X-ray diffraction with the conventional laboratory Xray source and the Rietveld refinements, we have suggested that the Se substitution resulted in the enhancement of the in-plane chemical pressure, and the bulk superconductivity is induced
Summary
The BiS2-based superconductors have been drawing much attention as a new layered superconductor family [1,2,3]. Recent studies have suggested that the emergence of superconductivity in BiS2-based compounds is related with the carrier doping and the crystal structure optimization. According to our recent report, the enhancement of in-plane chemical pressure, which is related to the enhancement of orbital overlaps, are required to induce bulk superconductivity in the LaO0.5F0.5BiS2 system [8].
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