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

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19 Citations (Scopus)

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.

Original languageEnglish
Article number145603
JournalJournal of Physics Condensed Matter
Volume29
Issue number14
DOIs
Publication statusPublished - 2017 Mar 6

Keywords

  • BiS-based superconductors
  • effect of substitution
  • local structure and disorder

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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