Anisotropy of the Electrical Conductivity of Ferrites with the Magnetoplumbite Structure

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Abstract
Single crystal samples of barium and lead ferrites with the magnetoplumbite structure show a marked anisotropy of electrical conductivity. The absolute values of resistivity along the hexagonal axis (ϱ∥) are approximately an order of magnitude higher then those measured in the basal plane (ϱ⟂), the temperature dependences of these resistivities being similar. The magnitude of the conductivity, the sign of the Seebeck effect and the chemical analysis indicate that the conductivity mechanism is related to the presence of Fe2+ ions. The conductivity is assumed to occur through a hopping mechanism between these ions. Taking an approximate expression for the dependence of the electron jumping probability on the ion separation, and applying this to the magnetoplumbite structure leads to semi‐quantitative agreement with the experimental data.

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