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Two ferromagnetic phases with different spin states of Mn and Ni in LaMn 0.5 Ni 0.5 O 3

A ferromagnetic transition below 280 K is observed in the temperature variation of the magnetization, measured using high magnetic fields, for samples of LaMn 0 . 5 Ni 0 . 5 O 3 synthesized by the high-temperature solid-state reaction method. On the other hand, two well-defined magnetic transitions, at -- 150 and ∼280 K, are observed in low-field zero-field-cooled (ZFC) magnetization (M Z F C ) measurements on these samples, indicating the possibility for the existence of two different ferromagnetic phases of the compound. LaMn 0 . 5 Ni 0 . 5 O 3 , synthesized by a low-temperature method, shows a single magnetic transition at ∼150 K for samples annealed below 500°C and a single magnetic transition at 280 K for samples annealed above 1000 °C in the low-field M Z F C measurements. Broad or multiple magnetic transitions are observed for the low-temperature samples annealed in the temperature range 500-1100°C. High-temperature magnetic susceptibility, powder x-ray-diffraction, and core-level x-ray photoelectron spectroscopic studies on the single-phase samples (annealed at 400 and 1300°C) indicate that the nanocrystalline material (obtained at 400°C) with spin states of Mn and Ni as Mn 4 + and Ni 2 + undergoes a magnetic transition below 150 K, whereas high temperature (1300°C) annealed material with spin states like Mn 3 + and low-spin Ni 3 + becomes ferromagnetic below 280 K. A charge disproportionation of the type Mn 4 + +Ni 2 + →Mn 3 + +Ni 3 + takes place when the low-temperature synthesized LaMn 0 . 5 Ni 0 . 5 O 3 is annealed above 500°C. The results give evidence for the existence of two different phases of LaMn 0 . 5 Ni 0 . 5 O 3 with different crystal structures and different spin states of Mn and Ni.