Synchrotron powder X-ray diffraction and structural analysis of Eu0.5La0.5FBiS2-x Se x

29th International Symposium on Superconductivity

Nagasaka, K.^1 ; Jinno, G.^1 ; Miura, O.^1 ; Miura, A.^2 ; Moriyoshi, C.^3 ; Kuroiwa, Y.^3 ; Mizuguchi, Y.^1

Department of Electrical and Electronic Engineering, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji

192-0397, Japan^1

Faculty of Engineering, Hokkaido University, Kita-13, Nishi-8, Kita-ku, Sapporo

060-8628, Japan^2

Department of Physical Science, Hiroshima University, 1-3-1 Kagamiyama, Higashihiroshima, Hiroshima

739-8526, Japan^3

关键词: Bulk superconductivity;    Chemical pressures;    Electron carrier;    In-plane disorder;    Precise determinations;    Structural parameter;    Synchrotron powder diffraction;    Synchrotron powder X-ray diffractions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/871/1/012007/pdf
DOI  :  10.1088/1742-6596/871/1/012007

来源: IOP

【 摘 要 】

Eu0.5La0.5FBiS2-xSexis a new BiS2-based superconductor system. In Eu0.5La0.5FBiS2-xSex, electron carriers are doped to the BiS2layer 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-xSexusing 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-xSexis achieved by the enhanced in-plane chemical pressure and the decrease in in-plane disorder.