Ferromagnetic-antiferromagnetic transition and magnetotransport properties of La0.7Sr0.3Mn1−xNixO3 perovskites

The crystal structure and magnetic properties of polycrystalline compounds La0.7Sr0.3Mn1−xNixO3 (x 0.37) were studied by neutron powder diffraction and magnetometry measurements, and the magnetotransport properties were also investigated, focusing on the magnetic state of the compounds. The crystal structure of the compounds remains rhombohedral upon chemical doping with Ni ions in the mentioned concentration range within the temperature interval 5-300 K. Doping with nickel ions causes a decrease in magnetization, and the Curie point drops from ~290 K for x = 0.1 compound down to ~70 K for x = 0.3 wherein the electrical resistivity of the compounds increases. The compounds with the dopant concentration x