01. Transition of magnetic state from A-type antiferromagnetic to ferromagnetic in electron-doped Nd1-xCexMnO3

The transition of the magnetic state with x x increasing in electron-doped manganite Nd1−xCexMnO3 Nd 1−x Ce x MnO 3 is investigated through the measurements of magnetism, including the M–T M–T and hysteresis curves. For x=0.04, x=0.04, with temperature increasing, M M under zero-field cooling indicates that the magnetic structure changes from ferromagnetic (FM) to antiferromagnetic then to FM again and finally turns to paramagnetic (PM). However, the field-cooling M–T M–T curve shows a negative M M at 5 K then increases rapidly to a positive maximum and finally turns to PM. The experiment results are well fitted with Weiss’s molecular field theory and Néel’s ferrimagnetic model. With the enhancement of Ce content (x=0.08 (x=0.08 and 0.10), this system gradually exhibits simple transition from FM to PM.