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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
Article

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

Manganite Double Exchange Small Polaron Increase Doping Level Double Exchange Interaction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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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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