Abstract
Comparative investigations of the nuclear magnetic resonance and nuclear spin-spin relaxation residents of Mn55 nuclei of nanopowders of the manganite La0.7Sr0.3MnO3 with different particle sizes 50–200nm (NP1) and 12nm (NP2) have been performed. It has been found that two local ferromagnetic phases (FgM and FbM) with different magnetic spin dynamics coexist in a wide temperature interval in the NP1 sample. The phase FgM phase is identified as a ferromagnetic metallic phase which is due to double exchange and the FbM phase is identified as a ferromagnetic phase with slower hole motion and weaker double exchange. It is established that only one ferromagnetic state, corresponding to the FbM phase, exists in the NP2 sample. The results of these investigations show that the stability of the nonuniform ferromagnetic state of lanthanum manganites can be limited below by a characteristic minimum scale.
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