Role of the local structure in superconductivity of Lao0.5F0.5BiS2-xSex system

E. Paris; Y. Mizuguchi; M. Y. Hacisalihoglu; T. Hiroi; B. Joseph; G. Aquilanti; O. Miura; T. Mizokawa; N. L. Saini

doi:10.1088/1361-648X/aa5e97

Role of the local structure in superconductivity of Lao_0.5F_0.5BiS_2-xSe_x system

E. Paris, Y. Mizuguchi, M. Y. Hacisalihoglu, T. Hiroi, B. Joseph, G. Aquilanti, O. Miura, T. Mizokawa, N. L. Saini

School of Advanced Science and Engineering

Research output: Contribution to journal › Article › peer-review

24 Citations (Scopus)

Abstract

We have studied the local structure of LaO_0.5F_0.5BiS_2-xSe_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 . 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.

Original language	English
Article number	145603
Journal	Journal of Physics Condensed Matter
Volume	29
Issue number	14
DOIs	https://doi.org/10.1088/1361-648X/aa5e97
Publication status	Published - 2017 Mar 6

Keywords

BiS-based superconductors
effect of substitution
local structure and disorder

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics

Access to Document

10.1088/1361-648X/aa5e97

Cite this

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title = "Role of the local structure in superconductivity of Lao0.5F0.5BiS2-xSex system",

abstract = "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 . 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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AU - Paris, E.

AU - Mizuguchi, Y.

AU - Hacisalihoglu, M. Y.

AU - Hiroi, T.

AU - Joseph, B.

AU - Aquilanti, G.

AU - Miura, O.

AU - Mizokawa, T.

AU - Saini, N. L.

PY - 2017/3/6

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