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We report a systematic angle-resolved photoemission spectroscopy study onBa(Fe$_{1-x}$Ru$_x$)$_2$As$_2$ for a wide range of Ru concentrations (0.15$\leq$ \emph{x} $\leq$ 0.74). We observed a crossover from two-dimension tothree-dimension for some of the hole-like Fermi surfaces with Ru substitutionand a large reduction in the mass renormalization close to optimal doping.These results suggest that isovalent Ru substitution has remarkable effects onthe low-energy electron excitations, which are important for the evolution ofsuperconductivity and antiferromagnetism in this system.

Effects of Ru Substitution on Dimensionality and Electron Correlations in Ba(Fe_{1-x}Ru_x)_2As_2