Abstract
The magnetic properties of the La5/3Sr1/3NiO4 samples with different particle sizes synthesized by sol-gel method were studied in detail by magnetometry. Compared with that of the bulk sample, the fine particle samples show a ferromagnetic transition at about 23 K accompanied by the depression of the spin antiferromagnetic ordering. The infrared (IR) absorption spectra and the structural analysis reveal that the lattice distortion is enhanced, while the size of the La5/3Sr1/3NiO4 particles is decreased. It is suggested that the ferromagnetism in fine La5/3Sr1/3NiO4 particles at low temperature comes from the shrinking effect of the Ni–O bond in Ni–O plane.
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