Structural and magnetic properties of hole-doped (La_(0.56)Ce_(0.14))Sr_(0.30)MnO_3 perovskite

摘要

We have successfully prepared a single-phase Ce-doped sample (La_(0.56)Ce_(0.14))Sr_(0.30)MnO_3 by a solid-state route, without CeO_2 oxide segregation. Compared to the undoped sample La_(0.70)Sr_(0.30)MnO_3. the structure remains hexagonal with R3-bar c space group without a large variation of the cell parameters and volume. The thermal variation of the magnetization shows that the Ce-doped sample exhibits a ferromagnetic to paramagnetic transition at 357 K and an anti-ferromagnetic coupling below 100 K between the ferromagnetic Mn moments and the Ce moments and thus form a ferrimagnetic ground state. Comparing our results to those of the literature, we can suggest that the cerium ions are in a trivalent state (Ce~(3+)) and the anomalous behaviour attributed to a Kondo-like effect.