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Dynamics of cubic-tetragonal phase transition in KNbO3 perovskite

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Abstract

The low-energy part of the vibration spectrum of KNbO3 was studied by cold neutron inelastic scattering in the cubic phase. In addition to acoustic phonons, we observe strong diffuse scattering, which consists of two components. The first one is quasistatic and has a temperature-independent intensity. The second component appears as quasielastic scattering in the neutron spectrum, indicating a dynamic origin. From analysis of the inelastic data, we conclude that the quasielastic component and the acoustic phonon are mutually coupled. The susceptibility associated with the quasielastic component grows as the temperature approaches T C .

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Authors and Affiliations

  1. Laboratory for Neutron Scattering, ETHZ & Paul Scherrer Institut, CH-5232, Villigen, PSI, Switzerland

    S. N. Gvasaliya & B. Roessli

  2. Ioffe Physicotechnical Institute, St. Petersburg, 194021, Russia

    S. N. Gvasaliya & S. G. Lushnikov

  3. Clarendon Laboratory, Oxford University, Parks Road, Oxford, OX1 3PU, UK

    R. A. Cowley

  4. Nonlinear Optics Laboratory ETH, Hönggerberg, CH-8093, Zürich, Switzerland

    A. Choubey & P. Günter

Authors
  1. S. N. Gvasaliya
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  2. B. Roessli
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  3. R. A. Cowley
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  4. S. G. Lushnikov
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  5. A. Choubey
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  6. P. Günter
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Additional information

From Pis’ma v Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 80, No. 5, 2004, pp. 403–407.

Original English Text Copyright © 2004 by Gvasaliya, Roessli, Cowley, Lushnikov, Choubey, Günter.

This article was submitted by the authors in English.

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Gvasaliya, S.N., Roessli, B., Cowley, R.A. et al. Dynamics of cubic-tetragonal phase transition in KNbO3 perovskite. Jetp Lett. 80, 355–358 (2004). https://doi.org/10.1134/1.1825122

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  • DOI: https://doi.org/10.1134/1.1825122

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