High-pressure synthesis of BaRhO, a rhodate analogue of the layered perovskite Sr-ruthenate
arXiv:2010.06556 · doi:10.1103/PhysRevMaterials.5.015001
Abstract
A new layered perovskite-type oxide BaRhO was synthesized by a high-pressure technique with the support of convex-hull calculations. The crystal and electronic structure were studied by both experimental and computational tools. Structural refinements for powder x-ray diffraction data showed that BaRhO crystallizes in a KNiF-type structure, isostructural to SrRuO and BaIrO. Magnetic, resistivity, and specific heat measurements for polycrystalline samples of BaRhO indicate that the system can be characterized as a correlated metal. Despite the close similarity to its SrRuO counterpart in the electronic specific heat coefficient and the Wilson ratio, BaRhO shows no signature of superconductivity down to 0.16 K. Whereas the Fermi surface topology has reminiscent pieces of SrRuO, an electron-like e-() band descends below the Fermi level, making of this compound unique also as a metallic counterpart of the spin-orbit-coupled Mott insulator BaIrO.
arXiv comment8 pages, 6 figures
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