Abstract
Magnetic phase transition behaviors of perovskite-like La 2/3A 1/3MnO 3 (A=Ca, Sr and Ba) oxides at Curie temperature ( T c) are explored through a systematic study on their structural, magnetic, and thermal properties. It is found that the ferromagnetic transition changes from first order to second order as the ionic radius of doped alkaline earth element increases. In the first order magnetic transition of La 2/3Ca 1/3MnO 3 oxide, polarons transit discontinuously to itinerant electrons, but continuously in the second order transitions of both La 2/3Sr 1/3MnO 3 and La 2/3Ba 1/3MnO 3 oxides. The distortion of the MnO 6 octahedra of the oxides, which is dominated by the lattice structures, may play an important role in the order of magnetic transitions through controlling the polaron delocalization.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
