Magnetotransport Property for the Magnetoplumbite-Derived Oxide BaCo₆O₁₁

Abstract

We studied magnetotransport property for the layered cobalt oxide BaCo₆O₁₁, which was recently reported as a novel compound with isostructure of magnetoplumbite-derived oxide of SrCo₆O₁₁. A polycrystalline sample of BaCo₆O₁₁ exhibits metallic behavior in the electrical resistivity below the ferromagnetic transition temperature of 11.5 K. A tunneling-type magnetoresistance up to −20% was observed at 11.5 K and 90 kOe. These observations propose a half-metallic electronic state for BaCo₆O₁₁.