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Hyperfine Interactions

, Volume 198, Issue 1–3, pp 1–4 | Cite as

Phonon mode softening at the ferroelectric transition in Eu0.5Ba0.5TiO3

  • W. N. Rowan-Weetaluktuk
  • D. H. Ryan
  • A. O. Sushkov
  • S. Eckel
  • S. K. Lamoreaux
  • O. P. Sushkov
  • J. M. Cadogan
  • M. Yethiraj
  • A. J. Studer
Article

Abstract

We have observed the effects of phonon mode softening at the ferroelectric transition in Eu0.5Ba0.5TiO3 by 151Eu Mössbauer spectroscopy. Both Eu2+ and Eu3+ spectral components are observed in the relative area ratio of 90% : 10% and both show a decrease in subspectral area at the transition, centred at 175 K, due to phonon mode softening. Surprisingly, the temperature dependence of the f-factor shows a much stronger response in the Eu3+ component than in the Eu2+ one. Preliminary analysis of neutron powder diffraction data rules out the possibility that some of the europium might be located on titanium sites.

Keywords

Ferroelectric Mössbauer spectroscopy Electron electric dipole moment 

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References

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • W. N. Rowan-Weetaluktuk
    • 1
  • D. H. Ryan
    • 1
  • A. O. Sushkov
    • 2
  • S. Eckel
    • 2
  • S. K. Lamoreaux
    • 2
  • O. P. Sushkov
    • 3
  • J. M. Cadogan
    • 4
  • M. Yethiraj
    • 5
  • A. J. Studer
    • 5
  1. 1.Department of PhysicsMcGill UniversityMontrealCanada
  2. 2.Department of PhysicsYale UniversityNew HavenUSA
  3. 3.School of PhysicsUniversity of New South WalesSydneyAustralia
  4. 4.Department of Physics and AstronomyUniversity of ManitobaWinnipegCanada
  5. 5.Bragg Institute, ANSTOMenaiAustralia

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