Abstract
An investigation of the electrical and magnetoresistance behavior of La0.57Nd0.1Sr0.33MnO3 is presented. The temperature dependence of electrical resistivity shows a metal–semiconductor transition, which occurs at TM–SC=336K and shifts to higher temperatures under applied magnetic fields. It shows a large magnetoresisance (MR) effect (~30% at 5T field). Metallic resistivity ρ(T)=ρ0+ρ1T2 is observed below TM–SC. Above TM–SC, the electrical conductivity is dominated by adiabatic small polaron hopping model, giving the electrical resistivity in the paramagnetic region as ρPM(T)=CTexp(EaKTB). The percolation theory is introduced to understand the transport mechanism in the whole temperature range. Hence, we found that the estimated values of the resistivity are in good agreement with experimental data. A relation between the resistivity ρ and magnetic entropy change ΔSM is also presented by using an equation of the form ΔSMρ(T,H)=−α∫0H[∂Lnρ∂T]HdH, which relates magnetic order to transport behavior of the compounds.
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