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We report the structure, magnetic, and thermal property measurements onsingle crystalline and polycrystalline samples of Ru substituted honeycomblattice iridate Na$_2$Ir$_x$Ru$_{1-x}$O$_3$ (x = 0, 0.05, 0.1, 0.15, 0.2, 0.3,0.5). The evolution of magnetism in Na$_2$Ir$_x$Ru$_{1-x}$O$_3$ has beenstudied using dc and ac magnetic susceptibility, and heat capacitymeasurements. The parent compound Na$_2$IrO$_3$ is a spin-orbit driven Mottinsulator with magnetic order of reduced moments below $T_N = 15$~K\@. In theRu substituted samples the antiferromagnetic long range state is replaced by aspin glass like state even for the smallest substitution suggesting that themagnetic order in Na$_2$IrO$_3$ is extremely fragile. We argue that thesebehaviors indicate the importance of nearest-neighbor magnetic exchange in theparent Na$_2$IrO$_3$. Additionally, all samples show insulating electricaltransport.

Fragile magnetic order in the honeycomb lattice Iridate Na$_{2}$IrO$_3$ revealed by magnetic impurity doping