Mössbauer study of 1% 57Fe doped ferromagnetic insulator La0.825Ca0.175MnO3

  • M. Pissas
  • G. Papavassiliou
  • E. Devlin
  • A. Simopoulos
  • V. Likodimos
Solid and Condensed State Physics

Abstract.

We have employed magnetization measurements, Mössbauer and ESR spectroscopic techniques, in order to study the ferromagnetic insulating (FMI) compound La1-xCaxMnO3 (x=0.175) doped with 1% 57Fe. We have used two samples; one prepared in air which has cation vacancies and a second in inert atmosphere, which is stoichiometric. An abrupt change of the experimental results is obtained, by all techniques, in the ferromagnetic insulating regime, in the temperature region of TO/O//≈60 K, where an orbital rearrangement is suggested to occur. An analysis of these findings points to an orbital rearrangement transformation. Ferromagnetic resonance reveals considerable differences between stoichiometric and cation deficient samples, indicating anisotropy of the exchange interactions in the former sample with significant temperature dependence, most pronounced in the vicinity of TO/O//

Keywords

Spectroscopy Atmosphere Neural Network Anisotropy Complex System 

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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005

Authors and Affiliations

  • M. Pissas
    • 1
  • G. Papavassiliou
    • 1
  • E. Devlin
    • 1
  • A. Simopoulos
    • 1
  • V. Likodimos
    • 2
  1. 1.Institute of Materials ScienceAthensGreece
  2. 2.Department of PhysicsNational Technical University of AthensAthensGreece

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