Temperature dependent local atomic displacements in Ru substituted SmFe_{1-x}Ru_{x}AsO_{0.85}F_{0.15} superconductors

Abstract

Local structure of SmFe${}_{1-x}$Ru${}_x$AsO${}_{0.85}$F${}_{0.15}$ ($x$ = 0.0, 0.05, 0.25 and 0.5) superconductors has been investigated by temperature dependent As $K$-edge extended x-ray absorption fine structure. The effect of Ru substitution remains confined to the iron-arsenide layer but neither the static disorder nor the Fe-As bond strength suffers any change for $x\le$ 0.25. With further Ru substitution the static disorder increases while the Fe-As bond strength remains unchanged. Also, the Ru-As distance ($\sim$2.42 Å), different from the Fe-As distance ($\sim$2.39 Å), does not show any change in its force constant with the Ru substitution. These observations suggest that the SmFe${}_{1-x}$Ru${}_x$AsO${}_{0.85}$F${}_{0.15}$ system breaks down to coexisting local electronic phases on isoelectric substitution in the active FeAs layer.

References in corpus (17)

• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• Pnictogen height as a possible switch between high-T_c nodeless and low-T_c nodal pairings in the iron based superconductors
• Effect of Structural Parameters on Superconductivity in Fluorine-Free LnFeAsO1-y (Ln=La,Nd)
• Bandwidth and Fermi surface of Iron-Oxypnictides: covalency and sensitivity to structural changes
• Evidence of local structural inhomogeneity in FeSe(1-x)Te(x) from extended x-ray absorption fine structure
• Synthesis, crystal structure, microstructure, transport and magnetic properties of SmFeAsO and SmFeAs(O0.93F0.07)
• Isoelectronic Ru substitution at Fe-site in Sm(Fe1-xRux)As(O0.85F0.15) compound and its effects on structural, superconducting and normal state properties
• Low-temperature lattice anomaly in LaFeAsO0.93F0.07 probed by x-ray absorption spectroscopy: Evidence for strong electron-lattice interaction
• Correlated trends of coexisting magnetism and superconductivity in optimally electron-doped oxy-pnictides
• Local structure of REFeAsO (RE=La, Pr, Nd, Sm) oxypnictides studied by Fe K-edge EXAFS
• The optical phonon spectrum of SmFeAsO
• Large local disorder in the superconducting K_{0.8}Fe_{1.6}Se_{2} studied by extended x-ray absorption fine structure
• Effect of Ru susbstitution on atomic displacements in the layered SmFe_{1-x}Ru_xAsO_{0.85}F_{0.15} superconductor
• RE L${}_3$ X-ray absorption study of REO${}_{1-x}$F${}_x$FeAs (RE=La, Pr, Nd, Sm) oxypnictides
• Nanoscale textured superconductivity in Ru-substituted BaFe2As2 : a challenge to a universal phase diagram for the pnictides
• Temperature dependent local structure of NdFeAsO1-xFx system using arsenic K-edge extended x-ray absorption fine structure
• Local structural studies of Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ using atomic pair distribution function analysis

Cited by in corpus (5)

• Spatial competition of the ground states in 1111 iron pnictides
• Importance of structural distortions in enhancement of transition temperature in FeSe${}_{1-x}$Te${}_x$ superconductors
• Structural properties and phase diagram of the $La(F{e}_{1-x}R{u}_x)AsO$ system
• Temperature dependent As K-edge EXAFS studies of LaFe1-xCoxAsO (x = 0.0 and 0.11) single crystals
• Structural investigation of the Sm(Fe1-xRux)As(O0.85F0.15) system: a synchrotron X-ray powder diffraction study