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The interplay between spin-orbit coupling (SOC) and electron correlation($U$) is considered for many exotic phenomena in iridium oxides. We haveinvestigated the evolution of structural, magnetic and electronic properties inpyrochlore iridate Y$_2$Ir$_{2-x}$Ru$_{x}$O$_7$ where the substitution of Ruhas been aimed to tune this interplay. The Ru substitution does not introduceany structural phase transition, however, we do observe an evolution of latticeparameters with the doping level $x$. X-ray photoemission spectroscopy (XPS)study indicates Ru adopts charge state of Ru$^{4+}$ and replaces the Ir$^{4+}$accordingly. Magnetization data reveal both the onset of magneticirreversibility and the magnetic moment decreases with progressive substitutionof Ru. These materials show non-equilibrium low temperature magnetic state asrevealed by magnetic relaxation data. Interestingly, we find magneticrelaxation rate increases with substitution of Ru. The electrical resistivityshows an insulating behavior in whole temperature range, however, resistivitydecreases with substitution of Ru. Nature of electronic conduction has beenfound to follow power-law behavior for all the materials.

Evolution of structure, magnetism and electronic transport in doped pyrochlore iridate Y$_2$Ir$_{2-x}$Ru$_{x}$O$_7$