Role of the local structure in superconductivity of LaO0.5F0.5BiS2−xSex system

Role of the local structure in superconductivity of LaO0.5F0.5BiS2−xSex system

We have studied the local structure of LaO0.5F0.5BiS2−xSex 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 relati...

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Veröffentlicht in:Journal of physics. Condensed matter 2017-03, Vol.29 (14)
Hauptverfasser: Paris, E, Mizuguchi, Y, Hacisalihoglu, M Y, Hiroi, T, Joseph, B, Aquilanti, G, Miura, O, Mizokawa, T, Saini, N L
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based superconductors
effect of substitution
local structure and disorder
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container_issue 14
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container_title Journal of physics. Condensed matter
container_volume 29
creator Paris, E
Mizuguchi, Y
Hacisalihoglu, M Y
Hiroi, T
Joseph, B
Aquilanti, G
Miura, O
Mizokawa, T
Saini, N L
description We have studied the local structure of LaO0.5F0.5BiS2−xSex 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 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.
doi_str_mv 10.1088/1361-648X/aa5e97
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subjects based superconductors
effect of substitution
local structure and disorder
title Role of the local structure in superconductivity of LaO0.5F0.5BiS2−xSex system
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