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The silver ruthenium oxide AgRuO$_3$ consists of honeycomb[Ru$_2^{5+}$O$_6^{2-}$] layers, and can be considered an analogue ofSrRu$_2$O$_6$ with a different intercalation stage. We present measurements ofmagnetic susceptibility and specific heat on AgRuO$_3$ single crystals whichreveal a sharp antiferromagnetic transition at 342(3)K. The electricaltransport in single crystals of AgRuO$_3$ is determined by a combination ofactivated conduction over an intrinsic semiconducting gap of $\approx$ 100 meVand carriers trapped and thermally released from defects. From powder neutrondiffraction data a N\'eel-type antiferromagnetic structure with the Ru momentsalong the $c$ axis is derived. Raman and muon spin rotation spectroscopymeasurements on AgRuO$_3$ powder samples indicate a further weak phasetransition or a crossover in the temperature range 125-200 K. The transitiondoes not show up in magnetic susceptibility and its origin is argued to berelated to defects but cannot be fully clarified. The experimental findings arecomplemented by DFT-based electronic structure calculations. It is found thatthe magnetism in AgRuO$_3$ is similar to that of SrRu$_2$O$_6$, however withstronger intralayer and weaker interlayer magnetic exchange interactions.

Magnetic and electronic ordering phenomena in the [Ru$_2$O$_6$] honeycomb lattice compound AgRuO$_3$