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Influence of the Grain Size on Polaron Transport in Nanostructured La_{2/3}Ca_{1/3}MnO_3 Evidenced by EPR

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Raita O., Grecu M., Filip X., Toloman D., Giurgiu L., Idziak S., Hoffmann S.

Acta Physica Polonica A

2005

vol. 108

issue 1

113-118

We report an electron paramagnetic resonance investigation of the grain size effects on the polaron transport in the paramagnetic regime of nanosized La_{2/3} Ca_{1/3}MnO_3 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.

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1 Acta Physica Polonica A

1 2005

1 Filip X.

1 Giurgiu L.

1 Grecu M.

1 Hoffmann S.

1 Idziak S.

1 Raita O.

1 Toloman D.

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Influence of the Grain Size on Polaron Transport in Nanostructured La_{2/3}Ca_{1/3}MnO_3 Evidenced by EPR