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, Takashi Mizokawa, N. L. Saini

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    14 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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  • Cite this

    Paris, E., Mizuguchi, Y., Hacisalihoglu, M. Y., Hiroi, T., Joseph, B., Aquilanti, G., Miura, O., Mizokawa, T., & Saini, N. L. (2017). Role of the local structure in superconductivity of Lao0.5F0.5BiS2-xSex system. Journal of Physics Condensed Matter, 29(14), [145603]. https://doi.org/10.1088/1361-648X/aa5e97