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Inelastic neutron scattering study of the relaxor ferroelectric PbMg1/3Nb2/3O3 at high temperatures

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Abstract

Results of inelastic neutron scattering experiments between 300 K and 900 K on the relaxor ferroelectric PbMg1/3Nb2/3O3 are presented. Within a mode-coupling analysis the data are consistent with the observation of a strongly damped quasi-optic excitation. It is demonstrated that below T d ≈ 650 K a dynamical crossover takes place manifesting itself by a narrow central peak. This crossover is accompanied by the appearance of strong damping of the transverse acoustic phonons, with the damping constant proportional to q 4. Different physical models of the crossover are discussed.

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Authors and Affiliations

  1. Ioffe Phys.-Tech. Institute, 26 Politekhnicheskaya, 194021, St.-Petersburg, Russia

    A. Naberezhnov & S. Vakhrushev

  2. Institut Laue-Langevin, B.P. 156, 38042, Grenoble Cedex 9, France

    B. Dorner

  3. Institut für Theoretische Physik, Universität Regensburg, 93040, Regensburg, Germany

    D. Strauch

  4. Laboratoire Léon Brillouin (CEA-CNRS), CEA Saclay, 91191, Gif-sur-Yvette Cedex, France

    H. Moudden

Authors
  1. A. Naberezhnov
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  2. S. Vakhrushev
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  3. B. Dorner
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  4. D. Strauch
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  5. H. Moudden
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Correspondence to A. Naberezhnov.

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Naberezhnov, A., Vakhrushev, S., Dorner, B. et al. Inelastic neutron scattering study of the relaxor ferroelectric PbMg1/3Nb2/3O3 at high temperatures. Eur. Phys. J. B 11, 13–20 (1999). https://doi.org/10.1007/s100510050912

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  • DOI: https://doi.org/10.1007/s100510050912

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