Structural and physical properties of the 6H BaRuO3 polymorph synthesized under high pressure

The single-phase 6H BaRuO3 with the hexagonal BaTiO3 structure was synthesized at 5 GPa and 1000 °C. Rietveld refinement of the powder X-ray data for the 6H phase resulted in the lattice parameters to be a=5.7127(1) Å and c=14.0499(2) Å; the average Ru–O distance and direct Ru–Ru distance in the Ru2O9 dioctahedron being 1.992(6) and 2.5658(14) Å, respectively. The electrical resistivity of the 6H BaRuO3 follows a relationship of ρ versus T3/2 below 60.0 K, a signature deviation from the Fermi-liquid behavior. Both magnetic susceptibility and specific heat data indicate that the 6H BaRuO3 is an exchange-enhanced Pauli paramagnet due to the electron correlation effect with large Wilson ratio RW and Stoner enhancement factor. The comprehensive evolution of transport and magnetic properties from 9R across 4H to 6H BaRuO3 was discussed.

The single-phase 6H BaRuO3 was synthesized under high pressure high temperature. The electrical resistivity of 6H BaRuO3 follows a T3/2 relation below 60.0 K. Both magnetic susceptibility and specific heat data indicate that 6H BaRuO3 is an exchange-enhanced Pauli paramagnet with the large Wilson ratio and Stoner enhancement factor.Figure optionsDownload as PowerPoint slide