Magnetic and orbital structures of manganites in the model with four non-equivalent Mn ions

Abstract Magnetic and orbital ground states have been calculated for manganites of the type RxA1−xMnO3 in the region of small x basing on the double-exchange model supplemented with the doping dependent splitting of eg level. Minimization of the total energy with no preliminary restrictions on local spin directions and eg orbital states of four Mn ions of the orthorhombic unit cell resulted in a rich phase diagram generally consistent with experimental observations. A novel magnetic and orbital phase has been found to appear in the moderate electron-doping region for JAF