Role of the local structure in superconductivity of LaO0.5F0.5BiS2-x Se x system.
J Phys Condens Matter
; 29(14): 145603, 2017 Apr 12.
Article
em En
| MEDLINE
| ID: mdl-28165329
ABSTRACT
We have studied the local structure of LaO0.5F0.5BiS2-x Se x by Bi L1-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 [Formula see text]. 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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MEDLINE
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En
Ano de publicação:
2017
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Article