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Some possible connection between spin and charge degrees of freedom inmagneto-resistive manganites is investigated through a thorough experimentalstudy of the magnetic (AC susceptibility and DC magnetization) and transport(resistivity and thermal conductivity) properties. Measurements are reported inthe case of well characterized polycrystalline La_{0.8}Sr_{0.2}MnO_3 samples.The experimental results suggest rather strong field-induced polarizationeffects in our material, clearly indicating the presence of ordered FM regionsinside the semiconducting phase. Using an analytical expression which fits thespontaneous DC magnetization, the temperature and magnetic field dependences ofboth electrical resistivity and thermal conductivity data are found to be wellreproduced through a universal scenario based on two mechanisms: (i) amagnetization dependent spin polaron hopping influenced by a Zeeman splittingeffect, and (ii) properly defined thermally excited polaron states which haveto be taken into account in order to correctly describe the behavior of theless conducting region. Using the experimentally found values of the magneticand electron localization temperatures, we obtain L=0.5nm and m_p=3.2m_e forestimates of the localization length (size of the spin polaron) and effectivepolaron mass, respectively.

journal of applied physics

Influence of Zeeman splitting and thermally excited polaron states on  magneto-electrical and magneto-thermal properties of magnetoresistive  polycrystalline manganite La_{0.8}Sr_{0.2}MnO_3