Structural, Magnetic And Electrical Properties Of Mg Doped La0.75Sr0.25MnO3 Manganite

In this study, the effect of Mg substitution on the structural, magnetic and electrical properties of La0.75Sr0.25_MgMn03 are investigated by XRD, Ac susceptibility and electrical resistivity measurements. The results show that by increasing Mg doping level, the paramagnetic-ferromagnetic and metal- insulator transition temperatures decreases. The samples at high doping region do not display a metal-insulator transition. It seems that, due to the almost same ionic radius of Mg2+ and Mn3+, Mg2+ mostly replaced Mn3+ instead of La3+ and weakens double exchange interaction.