Neutron-powder-diffraction study of structural and magnetic structure of La0.7Sr0.3Mn1−xTixO3 (x=0, 0.10, 0.20, and 0.30)

Neutron-diffraction and magnetic measurements have been used in order to study the structure and magnetic changes of La_0.7Sr_0.3Mn_1−xTi_xO₃ (x=0, 0.10, 0.20, and 0.30) perovskites. Magnetic measurements show that our samples exhibit a ferromagnetic–paramagnetic transition with decreasing temperature. Effects of Ti doping on the magnetic and nuclear structures are studied here by neutron-powder-diffraction for La_0.7Sr_0.3Mn_1−xTi_xO₃ (x=0.10, 0.20, and 0.30). Our analysis indicates that the three representative samples, with x=0.10, 0.20, and 0.30, have a hexagonal system of R3¯c space group, and that the magnetic moments order ferromagnetically into the (1 0 1) crystallographic planes, i.e. the magnetic moments of the Mn ion are in the ac plane, with no component along the b-axis. There is no crystalline structure changes when the Ti doping level increases.