Structural and physical properties of the 6H BaRuO3 polymorph synthesized under high pressure |
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Authors: | JG Zhao |
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Institution: | Beijing National Lab for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, PR China |
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Abstract: | 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. |
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Keywords: | High-pressure synthesis Ruthenate polymorphs 6H-perovskite Electrical conductivity Specific heat Rietveld analysis Enhanced Pauli paramagnet Electron correlation effects |
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