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We report an electron paramagnetic resonance investigation of the grain size effects on the polaron transport in the paramagnetic regime of nanosized La2/3Ca1/3MnO3 manganites. The temperature dependences of the EPR integral intensity were analyzed in terms of spin-spin exchange interaction and small polaron hopping scenarios. The polaron activation energy decreases with the reduction of the grain size. A discussion is given concerning the factors which could explain the observed change.

Influence of the Grain Size on Polaron Transport in Nanostructured La2/3Ca1/3MnO3Evidenced by EPR

Influence of the Grain Size on Polaron Transport in Nanostructured La_2/3Ca_1/3MnO₃Evidenced by EPR