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The effect of MgO doping on the structural, magnetic, and magnetotransport properties of La 0.8 Sr 0.2 MnO 3  (LSMO)/ x  MgO has been investigated. All samples were prepared by a solid-state reaction method. Alternating current susceptibility measurements for LSMO/ x  MgO samples show that the Curie transition temperature ( T c ) and magnetization decrease with the increase of MgO concentration. The rate of the decrease of  T c  at higher doping level is very fast. Also, samples with low doping level ( x  ≤ 2) show insulator-metal transition, but the transition temperature decreases and resistivity increases with the amount of MgO. It is observed that there is no insulator-metal transition at higher MgO doping level ( x  ≥ 3). Also, the results show that the value of low-field magnetoresistance decreases with the increase of MgO doping level. It seems that due to the higher sintering temperature and almost the same ionic radii of Mg 2+  and Mn 3+ , Mg 2+  mostly replaced Mn 3+  and weakened the double-exchange interaction, and consequently,  T c  and magnetoresistance decrease and resistivity increases with MgO doping.

The effect of MgO doping on the structural, magnetic, and magnetotransport properties of La0.8Sr0.2MnO3 manganite