|
|||||
|
|
Spin dynamics investigated by EPR in the paramagnetic regime of La2/3Ca1/3Mn1−x Me x O3 (Me = Al, In) manganites |
|
| Authors: | L. V. Giurgiu M. N. Grecu X. Filip O. Raita Al. Darabont D. Gavre J. Blasco |
| Affiliation: | 1. National Institute for Research and Development of Isotopic and Molecular Technologies, P.O. Box 700, 3400, Cluj-Napoca, Romania 2. National Institute for Material Physics, Bucharest, Romania 3. Faculty of Physics, Babes-Bolyai University, Cluj-Napoca, Romania 4. Departmento de Fisica de la Materia Condensada, Universidad de Zaragoza, Zaragoza, Spain |
| Abstract: | We report an electron paramagnetic resonance (EPR) investigation of the spin dynamics in the paramagnetic regime of the colossal magnetoresistive manganites La2/3Ca1/3Mn1?x Me x O3 (Me=Al, In;x≤0.05). The temperature dependences of the EPR linewidth and integral intensity have been analyzed in terms of the bottleneck spin relaxation and small-polaron hopping models. The exchange coupling integral between Mn3+ and Mn4+ ions and the polaron activation energy decrease with increasing doping level. A discussion is given concerning the factors which could explain the observed changes. |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |