Abstract
A systematic investigation of structural, magnetic and electrical properties of nanocrystalline La 0.67Ba 0.33MnO 3 materials, prepared by citrate gel method has been undertaken. The temperature-dependant low-temperature resistivity in ferromagnetic metallic (∼50 K) phase shows upturn behavior and is suppressed with applied magnetic field. The experimental data (<75 K) can be best fitted in the frame work of Kondo-like spin-dependant scattering, electron–electron and electron–phonon interactions. It has been found that upturn behavior may be attributed to weak spin disorder scattering including both spin polarization and grain boundary tunneling effects, which are the characteristic features of extrinsic magnetoresistance behavior, generally found in nanocrystalline manganites. The variation of electrical resistivity with temperature in the high temperature ferromagnetic metallic part of electrical resistivity (75K< T< T P) has been fitted with grain/domain boundary, electron–electron and magnon scattering mechanisms, while the insulating region ( T> T P) of resistivity data has been explained based on adiabatic small polaron hopping mechanism.
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