Abstract
(Nd 1− x Sm x ) 1/3Sr 2/3FeO 3 were synthesized and their charge ordering (CO) transition related to lattice distortion was systematically investigated. The canted antiferromagnetic spin ordering exists below Néel temperature ( T N). This phase transition is accompanied by charge disproportionation into nominally Fe 3+ and Fe 5+. The CO, a sequence of Fe +3 Fe +3 Fe +5 Fe +3 Fe +3Fe +5, which exists align the [1 1 1] direction of pseudo cubic perovskite. The three kinds of iron, Fe 3+, Fe 5+ and Fe 4+, are found below T N. The amount of Fe 4+ increases from 13% to 66% as temperature increases. This can be interpreted to mean that the charge ordering and disordering phase coexists. The charge ordering state is realized by strong hybridization between Fe and O atoms. The Néel temperature decreases with the increase of the Sm concentration.
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