Abstract
A lanthanum-based mixed rare earth manganite system with general composition formula La 0.33 Ln 0.34 Sr 0.33 MnO 3, (where Ln is a rare earth ion) has been prepared by the solid state reaction method. After usual characterization of these materials, a systematic study of the electrical resistivity both as a function of temperature (80–300 K) and magnetic field up to 7 Tesla was undertaken mainly to understand the conduction mechanism. On analyzing the experimental results, it has been concluded that the metallic (ferromagnetic) part of the resistivity (ρ) (below TP) fits with the equation ρ(T)=ρ0+ρ2T2+ρ4.5T4.5, indicating the importance of grain/domain boundary effects (ρ0), the electron-electron scattering process (ρ2T2) and the two magnon scattering process (ρ4.5T4.5). On the other hand, the paramagnetic insulating regime may be explained by using adiabatic small polaron hopping and variable range hopping mechanisms, thereby indicating that polaron hopping might be responsible for the conduction mechanism.
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