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The effect of Ru substitution on the local structure of layeredSmFe$_{1-x}$Ru$_x$AsO$_{0.85}$F$_{0.15}$ superconductor has been studied by As$K$- and Sm $L_3$ - edges x-ray-absorption spectroscopy. The extendedx-ray-absorption fine-structure measurements reveal distinct Fe-As and Ru-Asbondlengths in the Ru substituted samples with the latter being $\sim$0.03 \AA\longer. Local disorder induced by the Ru substitution is mainly confined to theFeAs layer while the SmO spacer layer sustains a relative order, consistentwith the x-ray-absorption near-edge structure spectra. The results suggestthat, in addition to the order/disorder in the active active iron-arsenidelayer, its coupling to the rare-earth\textminus oxygen spacer layer needs to beconsidered for describing the electronic properties of these layeredsuperconductors.

Effect of Ru susbstitution on atomic displacements in the layered SmFe_{1-x}Ru_xAsO_{0.85}F_{0.15} superconductor