Abstract
The technique of electron magnetic resonance (EMR) with a broad temperature regime (80–400 K) was employed for studying the surface states of La0.7Sr0.3MnO3 nanoparticles, which were synthesized by sol-gel routes with three different gelification agents (grain size≈17–24nm). Our EMR results reveal that all La0.7Sr0.3MnO3 nanoparticles have two magnetic states below the Curie temperatures TC. One is attributed to the core state and the other to surface state. Furthermore, the absorption field and the linewidth of surface state have a significant temperature dependence in the sample synthesized by citric acid, which may be associated with the existence of spin-glass state on the surface of nanoparticles.
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