Abstract
Nanophasic La0.7Sr0.3MnO3 (LSMO) samples were prepared by the sol–gel method. Thesamples were sintered at different temperatures ranging from 600 to1000 °C. It is shown that the transport and magnetoresistive propertiesof LSMO samples strongly depend on the sintering temperature(Ts). A substantial decrease in the insulator–metal transition temperature(TIM) and an enhancement in resistivity are found on lowering the sinteringtemperature. Furthermore, a reduction in magnetization and a slightdecrease in paramagnetic–ferromagnetic (PM–FM) transition temperatures(Tc) have been observed as the sintering temperature decreases. The magnetoresistance (MR) atT<Tc increases on decreasing the sintering temperature as well as increasing the applied magneticfield. The enhancement in MR on decreasing the sintering temperature is explained byenhanced spin-polarized tunnelling by assuming an increase of the grain boundarycontribution as the sintering temperature decreases.
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