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

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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.

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Authors and Affiliations

  1. Department of Physics, McGill University, Montreal, QC, H3A2T8, Canada

    W. N. Rowan-Weetaluktuk & D. H. Ryan

  2. Department of Physics, Yale University, New Haven, CT, 06520-8120, USA

    A. O. Sushkov, S. Eckel & S. K. Lamoreaux

  3. School of Physics, University of New South Wales, Sydney, NSW, 2070, Australia

    O. P. Sushkov

  4. Department of Physics and Astronomy, University of Manitoba, Winnipeg, MB, R3T2N2, Canada

    J. M. Cadogan

  5. Bragg Institute, ANSTO, PMB 1, Menai, NSW, 2234, Australia

    M. Yethiraj & A. J. Studer

Authors
  1. W. N. Rowan-Weetaluktuk
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  2. D. H. Ryan
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  3. A. O. Sushkov
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  4. S. Eckel
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  5. S. K. Lamoreaux
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  6. O. P. Sushkov
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  7. J. M. Cadogan
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  8. M. Yethiraj
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  9. A. J. Studer
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Corresponding author

Correspondence to J. M. Cadogan.

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Rowan-Weetaluktuk, W.N., Ryan, D.H., Sushkov, A.O. et al. Phonon mode softening at the ferroelectric transition in Eu0.5Ba0.5TiO3 . Hyperfine Interact 198, 1–4 (2010). https://doi.org/10.1007/s10751-010-0204-5

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  • DOI: https://doi.org/10.1007/s10751-010-0204-5

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