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Hyperfine Interactions

, Volume 41, Issue 1, pp 521–524 | Cite as

Mössbauer studies of mixed and substituted garnets

  • P. H. Umadikar
  • Milind Vaidya
  • S. R. Joshi
  • S. K. Karadnikar
  • R. Nagarajan
  • V. R. Marathe
Magnetism, Hyperfine Fields — Non-Metals
  • 15 Downloads

Abstract

We report here our57Fe Mössbauer studies on the mixed and substituted iron garnets. Magnetisation studies on substituted SmIG system {Sm3−x Cax} [Snx Fe2−x](Fe3)012 (0.2≤x≤1.8) show that the Tc decreases as x increases. We attribute this to the reduced strength of a-d interaction as a result of dilution of a-site. While the Mössbauer spectra seem to reflect this, an interesting feature is the unresolved hyperfine spectrum seen at 80K for x=1.0, even though the transition temperature (Tc) is 285K. For this concentration, varying the rare earth ion from Sm to Er, results in very similar spectra. We speculate spin glass behaviour for x=1.0. In mixed and substituted garnet system {Gd2.5R0.2Ca0.3} [Sn0.3Fe1.7](Fe3)012 (R=Y, Sm, Eu, Ho and Er), we observe well resolved spectra with no change in the hyperfine field with substitution of rare earth. This is consistant with the dominance of a-d interaction in these systems.

Keywords

Iron Thin Film Transition Temperature Rare Earth Spin Glass 
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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References

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Copyright information

© J.C. Baltzer A.G., Scientific Publishing Company 1988

Authors and Affiliations

  • P. H. Umadikar
    • 1
    • 2
  • Milind Vaidya
    • 1
    • 2
  • S. R. Joshi
    • 1
    • 2
  • S. K. Karadnikar
    • 1
    • 2
  • R. Nagarajan
    • 1
    • 2
  • V. R. Marathe
    • 1
    • 2
  1. 1.Institute of ScienceBombayIndia
  2. 2.Tata Institute of Fundamental ResearchBombayIndia

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