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

Autor:	L.M. Giurgiu, O. Raita, Maria Nicoleta Grecu, D. Toloman, S. Idziak, Stanisław K. Hoffmann, Xenia Filip
Rok vydání:	2005
Předmět:	Materials science Condensed matter physics Exchange interaction General Physics and Astronomy Resonance Activation energy Microstructure Polaron Grain size law.invention Paramagnetism law Condensed Matter::Strongly Correlated Electrons Electron paramagnetic resonance
Zdroj:	Acta Physica Polonica A. 108:113-118
ISSN:	1898-794X 0587-4246
DOI:	10.12693/aphyspola.108.113
Popis:	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.
Databáze:	OpenAIRE
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