Abstract
The composites La 0.6Sm 0.1Sr 0.3MnO 3 + xCoO ( x = 0.0, 0.1, 0.2, 0.3, 0.4 mol), named as A x samples, were synthesized by the sol-gel technique to derive homogeneous CoO-coated composites. CoO addition induces an increase of resistivity ( p) and a decrease of Curie temperature ( T c ), magnetization, and T p at which the p peak is located. It has been concluded that the resistivity below T p fits well with the equation ρ = ρ 0 + ρ 2 T 2 + ρ 4.5 T 4.5, indicating the importance of grain/domain boundary effects, the electron-electron scattering process, and the two magnon scattering process. On the other hand, the paramagnetic insulating region may be explained by using adiabatic small polaron hopping mechanism, thereby indicating that polaron hopping might be responsible for the conduction mechanism. Magnetoresistance results were explained by a two-level model of tunneling MR and percolation model.
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