Applied Magnetic Resonance

, 24:351 | Cite as

Spin dynamics investigated by EPR in the paramagnetic regime of La2/3Ca1/3Mn1−x Me x O3 (Me = Al, In) manganites

  • L. V. Giurgiu
  • M. N. Grecu
  • X. Filip
  • O. Raita
  • Al. Darabont
  • D. Gavre
  • J. Blasco


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.


Manganite Double Exchange Small Polaron Increase Doping Level Double Exchange Interaction 
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Copyright information

© Springer 2003

Authors and Affiliations

  • L. V. Giurgiu
    • 1
  • M. N. Grecu
    • 2
  • X. Filip
    • 1
  • O. Raita
    • 1
  • Al. Darabont
    • 3
  • D. Gavre
    • 1
  • J. Blasco
    • 4
  1. 1.National Institute for Research and Development of Isotopic and Molecular TechnologiesCluj-NapocaRomania
  2. 2.National Institute for Material PhysicsBucharestRomania
  3. 3.Faculty of PhysicsBabes-Bolyai UniversityCluj-NapocaRomania
  4. 4.Departmento de Fisica de la Materia CondensadaUniversidad de ZaragozaZaragozaSpain

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