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To explain the thermoelectric effects of La0.8Ca0.2MnO3 and La0.8Ce0.2MnO3 polycrystalline samples and to find the role of the scattering mechanism a systematic investigation of the thermopower S(T) in the metallic phase has been undertaken. In the relaxation time approximation it is noticed that the phonon drag S(T) with scattering of phonons from defects, grain boundaries, phonons and charge carriers in these samples are effective in the metallic regime. Subsequently, the Mott expression is employed to incorporate the carrier diffusive thermopower. The temperature dependence S(T) is determined by the competition among several operating scattering mechanisms for heat carriers and the balance between carrier diffusion and phonon drag contributions in polycrystalline samples of La0.8Ca0.2MnO3 and La0.8Ce0.2MnO3.

Effect of Ca(Ce) doping on thermopower of LaMnO3 manganites