Zhou, HaidongKiswandhi, AndhikaBarlas, YafisBrooks, JamesSiegrist, Theo MaxLi, G.Balicas, LuisCheng, J. G.Rivadulla Fernández, José Francisco2018-07-162018-07-162012Zhou, H., Kiswandhi, A., Barlas, Y., Brooks, J., Siegrist, T., & Li, G. et al. (2012). Orbital, charge, and spin couplings in Ru25+O9dimers of Ba3CoRu2O9. Physical Review B, 85(4). doi: 10.1103/physrevb.85.0412012469-9950http://hdl.handle.net/10347/17038e magnetic, transport, and structural properties of cold-pressed Ba3CoRu2O9 show (i) an antiferromagnetic transition, (ii) a semiconductor-semiconductor electronic transition where the resistivity is dominated by the electron hopping between the Ru25+O9 dimers with itinerant Ru electrons at high temperatures, and (iii) a hexagonal to orthorhombic structural phase transition. All three transitions occur at 93 K and are related to the Ru5+ ions in the Ru2O9 dimers. The Ru-O bond distortion below 93 K further indicates a possible orbital ordering for Ru5+ ions in isolated Ru2O9 dimers, which accounts for the strong orbital, charge, and spin couplingseng© 2012 American Physical Societyjournal article10.1103/PhysRevB.85.0412012469-9969open access