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Inelastic neutron scattering study of the relaxor ferroelectric PbMg 1/3 Nb 2/3 O 3 at high temperatures

Author

Listed:
  • A. Naberezhnov
  • S. Vakhrushev
  • B. Dorner
  • D. Strauch
  • H. Moudden

Abstract

Results of inelastic neutron scattering experiments between 300 K and 900 K on the relaxor ferroelectric PbMg 1/3 Nb 2/3 O 3 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. Copyright Società Italiana di Fisica, Springer-Verlag 1999

Suggested Citation

  • A. Naberezhnov & S. Vakhrushev & B. Dorner & D. Strauch & H. Moudden, 1999. "Inelastic neutron scattering study of the relaxor ferroelectric PbMg 1/3 Nb 2/3 O 3 at high temperatures," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 11(1), pages 13-20, September.
    • Handle: RePEc:spr:eurphb:v:11:y:1999:i:1:p:13-20:10.1007/s100510050912
    DOI: 10.1007/s100510050912
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