EPR investigation of nanosized La0.67Ca0.33MnO3−δ manganites

We report an electron paramagnetic resonance (EPR) investigation of the spin dynamics in the paramagnetic regime of nanosized La0.67Ca0.33MnO3−δ manganites. The temperature dependences of the EPR line width and integral intensity have been analyzed in terms of the bottlenecked spin relaxation and sm...

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Bibliographic Details
Published inApplied magnetic resonance Vol. 27; no. 1-2; pp. 139 - 150
Main Authors Giurgiu, L. M., Grecu, M. N., Darabont, Al, Raita, O., Filip, X., Pana, O., Toloman, D.
Format Journal Article
LanguageEnglish
Published Heidelberg Springer Nature B.V 01.03.2004
Subjects
Electron paramagnetic resonance
Grain size
Manganese ions
Manganites
Polarons
Spin dynamics
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Summary:We report an electron paramagnetic resonance (EPR) investigation of the spin dynamics in the paramagnetic regime of nanosized La0.67Ca0.33MnO3−δ manganites. The temperature dependences of the EPR line width and integral intensity have been analyzed in terms of the bottlenecked spin relaxation and small polaron hopping scenarios. The exchange coupling integral between Mn3+ and Mn4+ ions and the polaron activation energy decrease with the reduction of grain size. A discussion is given concerning the factors which could explain the observed changes.
ISSN:0937-9347
1613-7507
DOI:10.1007/BF03166309