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Antiferromagnetism at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>T</mml:mi><mml:mo>></mml:mo><mml:mn>500</mml:mn><mml:mspace width="0.16em" /><mml:mi mathvariant="normal">K</mml:mi></mml:mrow></mml:math>in the layered hexagonal ruthenate<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>SrR</mml:mi><mml:msub><mml:mi mathvariant="normal">u</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>6</mml…
We report an experimental and computational study of the magnetic and electronic properties of the layered Ru(V) oxide $\mathrm{SrR}{\mathrm{u}}_{2}{\mathrm{O}}_{6}$ (hexagonal, $P\overline{3}1m)$, which shows antiferromagnetic order with a N\'eel temperature of 563(2) K, among the highest for $4d$ oxides. Magnetic order occurs both within edge-shared octahedral sheets and between layers and …