Abstract
The electrical transport properties of dense PrBaCoTaO6 and PrBaCoNbO6 polycrystalline phases are thoroughly studied. Both measured conductivity and thermopower temperature dependencies are consistent with p-type adiabatic small polaron hopping mechanism. Detailed analysis based on DFT calculations reveals Co t2g orbitals play crucial role in charge transfer process. The proposed theoretical transport model predicts most trivalent Co ions tend to acquire an intermediate spin state acting as self-trapped electron holes. Estimated carrier mobility and polaron jump frequency values for both studied compounds are found to be in a reasonable coincidence with previously obtained results.
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