Improved Magnetoresistance in Sm0.7-xCexSr0.3MnO3 Manganites Prepared by a Sol-Gel Route

In this work, manganite ceramics of Sm0.7-xCexSr0.3MnO3 (0 <= x <= 0.3) are prepared by a citrate sol-gel chemical route and characterized. The structure of the obtained samples is refined in the orthorhombic system with the Pnma space group. The doping causes a change in the lattice parameters leading to a decrease in the cell volume. It also increases slightly the grain size of the crystallites. The temperature dependence of resistivity reveals a metal-insulator transition for all samples. The doping shifts the temperature of this transition towards high values. The extracted magnetoresistance for a 5 T magnetic field is enhanced by doping. The highest obtained value increases from 66.70% for x = 0 to 97.96% for x = 0.3.

Automated summary

In this study, manganite ceramics of Sm0.7-xCexSr0.3MnO3 were prepared by a citrate sol-gel chemical route. Doping caused changes in lattice parameters and cell volume, as well as a slight increase in grain size. Magnetoresistance for a 5 T magnetic field was enhanced by doping, with the highest value increasing from 66.70% to 97.96% for x = 0 and x = 0.3, respectively.