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

• Authors: O. Raita , M. Grecu , X. Filip , D. Toloman , L. Giurgiu , S. Idziak , S. Hoffmann
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

75.50.Tt; 73.63.Bd; 76.50.+g

Discipline

• 73.63.Bd: Nanocrystalline materials
• 75.50.Tt: Fine-particle systems; nanocrystalline materials
• 76.50.+g: Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance(see also 75.30.Ds Spin waves)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2005
• Volume: 108
• Issue: 1
• Pages: 113-118

Dates

published

2005-07

received

2005-04-24

Contributors

author

O. Raita

• National Institute for Research and Development of Isotopic and Molecular, Technologies, P.O. Box 700, 400293 Cluj-Napoca, Romania

author

M. Grecu

• National Institute for Material Physics, P.O. Box 700, 400293 76900 Bucharest-Magurele, Romania

author

X. Filip

• National Institute for Research and Development of Isotopic and Molecular, Technologies, P.O. Box 700, 400293 Cluj-Napoca, Romania

author

D. Toloman

• National Institute for Research and Development of Isotopic and Molecular, Technologies, P.O. Box 700, 400293 Cluj-Napoca, Romania

author

L. Giurgiu

• National Institute for Research and Development of Isotopic and Molecular, Technologies, P.O. Box 700, 400293 Cluj-Napoca, Romania

author

S. Idziak

• Institute of Molecular Physics, Polish Academy of Sciences, 60-179 Poznań, Poland

author

S. Hoffmann

• Institute of Molecular Physics, Polish Academy of Sciences, 60-179 Poznań, Poland

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Identifiers

DOI

10.12693/APhysPolA.108.113