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• W2892463778 abstract "Half-doped praseodymium manganites, Pr0.5Ca0.5MnO3, synthesized by the sol–gel method produce highly crystalline nanoparticles with no structural disorder at the surface. As for most half-doped (Mn3+:Mn4+ = 1) antiferromagnetic (AFM) charge-ordered manganites, ferromagnetism (FM) appears as particle size decreases. A possible origin of FM phase development is the lacking oxygen ligands at the surface that increases Mn3+ at the expense of Mn4+ in order to maintain electronic neutrality. In this work, we show that Mn3+:Mn4+ = 1 ratio is preserved in the whole crystalline particle with the exception of the surface, where this ratio changes to Mn3+:Mn4+ > 1. This Mn3+ excess makes a double exchange Mn3+ → O2– → Mn4+ prevail over the superexchange, giving rise to the FM interactions. We show that a shell thickness of only one unit cell, with acell = 0.38 nm, is enough to explain the onset of FM at the surface, whereas the volume remains AFM. Furthermore, the FM to AFM ratio fits to the increase of surface-to-volume ratio with decreasing particle size." @default.
• W2892463778 created "2018-10-05" @default.
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• W2892463778 date "2018-09-24" @default.
• W2892463778 modified "2023-10-17" @default.
• W2892463778 title "Surface Ferromagnetism in Pr_0.5Ca_0.5MnO₃ Nanoparticles as a Consequence of Local Imbalance in Mn³⁺:Mn⁴⁺ Ratio" @default.
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• W2892463778 doi "https://doi.org/10.1021/acs.chemmater.8b03070" @default.
• W2892463778 hasPublicationYear "2018" @default.
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