Abstract
Electrical transport properties in the ceramic specimens of (LaMn1−xTix)1−γO3system (x≤0.05) have been investigated as a function of temperature by the complex-plane impedance analyses, dielectric properties, four-probe DC conductivities, and Seebeck coefficients. The complex-plane impedance analysis distinguishes the bulk conduction from the conduction across the grain boundaries. The bulk conduction contains two thermally activated processes separated at the Néel temperature (TN). A dielectric relaxation appears in a loss tangent and electric modulus belowTN. The activation energy required for the relaxation is nearly equal to that for the conduction atT<TN. The electrical transport belowTNis explained self-consistently in terms of a hopping process of small polarons of holes, which are formed by a superexchange interaction and are more deeply localized by the assistance of the Jahn–Teller effect. A correlation between the bulk conduction atT>TNand the hopping process of small polarons of holes is also discussed.
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