Abstract
The crystal structure, resistivity, and magnetic susceptibility of the Li${}_{2}$Ir${}_{1\ensuremath{-}x}$Ru${}_{x}$O${}_{3}$ ($x=0$--1) polycrystals have been investigated. We found that the parent antiferromagnetic phase disappears for $x>0.2$ and bond dimers appear in the averaged structure for $x>0.5$ and likely fluctuate for much smaller $x$. Unexpectedly, this system remains insulating for all the doping levels, contrary to the predictions based on the one-band ${j}_{\mathrm{eff}}=1/2$ Kitaev-Heisenberg model. These results suggest that the honeycomb iridates doped with ruthenium are a unique $5d$-orbital-based platform for studying the interplay of the charge, orbital, spin, and lattice degrees of freedom.
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