Abstract
We have studied in this work the electrical and magnetoresistive properties of polycrystalline La0.75Dy0.05Sr0.2MnO3. Magnetic study has shown the presence of a paramagnetic–ferromagnetic transition at Curie temperature TC = 225 K. Temperature-dependent resistivity shows two resistivity peaks. The magnetotransport in the metallic phase can be described by Zener’s polynomial law, while small polaron hopping mechanism is more suitable to describe resistivity evolution in the insulating phase. The resistivity upturn observed around 75 K was ascribed to electron–electron scattering process at low temperature. We have recorded important values of negative magnetoresistance (MR) around TC (MR (T) ~ 22% and MR (H) ~ 19%) for only 1 T applied magnetic field. This suggests the possibility of using our sample for magnetic field sensing and spintronics.
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