期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 29, 期 14, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-648X/aa5e97
关键词
BiS2-based superconductors; effect of substitution; local structure and disorder
资金
- JSPS under KAKENHI [25707031, 26600077, 15H05886]
- MIUR, Italy [2012X3YFZ2]
- Grants-in-Aid for Scientific Research [16H04493, 26600077, 15H05886] Funding Source: KAKEN
We have studied the local structure of LaO0.5F0.5BiS2-xSex by Bi L-1-edge extended x-ray absorption fine structure (EXAFS). We find a significant effect of Se substitution on the local atomic correlations with a gradual elongation of average in-plane Bi-S bondlength. The associated mean square relative displacement, measuring average local distortions in the BiS2 plane, hardly shows any change for small Se substitution, but decreases significantly for x >= 0.6. The Se substitution appears to suppress the local distortions within the BiS2 plane that may optimize in-plane orbital hybridization and hence the superconductivity. The results suggest that the local structure of the BiS2-layer is one of the key ingredients to control the physical properties of the BiS2-based dichalcogenides.
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