Electrical transport and giant magnetoresistance in La0.62Er0.05Ba0.33FexMn1−xO3 (x = 0.00, and 0.15) manganites

We have investigated the influence of fer (Fe) doping on the magneto-electrical properties of polycrystalline samples La0.62Er0.05Ba0.33FexMn1−xO3 (x = 0.00, 0.10 and 0.15), prepared through conventional solid state ceramics route. Comparison of experimental data with the theoretical models shows that in the metal-ferromagnetic region, the electrical behavior of the three samples is quite well described by a theory based on electron-phonon, electron-electron, electron-magnon and Kondo-like spin dependent scattering. For the high temperature paramagnetic insulating regime, the adiabatic small polaron hopping (SPH) model is found to fit well the experimental curves.