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

被引：0
作者：
L. M. Giurgiu
M. N. Grecu
Al. Darabont
O. Raita
X. Filip
O. Pana
D. Toloman
机构：
[1] National Institute for Research and Development of Isotopic and Molecular Technologies,Faculty of Physics
[2] National Institute for Material Physics,undefined
[3] Babes-Bolyai University,undefined
来源：
Applied Magnetic Resonance | 2004年 / 27卷
关键词：
Electron Paramagnefic Resonance; Manganite; Exchange Coupling; Spin Dynamic; Small Polaron;
D O I：
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学科分类号：
摘要：
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.
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页码：139 / 150
页数：11
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