Dynamics of cubic-tetragonal phase transition in KNbO$_3$ perovskite

S. N. Gvasaliya; B. Roessli; R. A. Cowley; S. G. Lushnikov; A. Choubey; P. Gunter

doi:10.1134/1.1825122

Dynamics of cubic-tetragonal phase transition in KNbO$_3$ perovskite

Materials Science 2007-05-23 v1

Authors: S. N. Gvasaliya , B. Roessli , R. A. Cowley , S. G. Lushnikov , A. Choubey , P. Gunter

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Abstract

The low-energy part of the vibration spectrum in KNbO $_3$ 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 quasi-static and has a temperature-independent intensity. The second component appears as quasi-elastic scattering in the neutron spectrum indicating a dynamic origin. From analysis of the inelastic data we conclude that the quasi-elastic component and the acoustic phonon are mutually coupled. The susceptibility associated with the quasi-elastic component grows as the temperature approaches T $_C$ .

Keywords

KNbO3 cubic-tetragonal phase transition neutron inelastic scattering phonon susceptibility

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@article{arxiv.cond-mat/0407712,
  title  = {Dynamics of cubic-tetragonal phase transition in KNbO$_3$ perovskite},
  author = {S. N. Gvasaliya and B. Roessli and R. A. Cowley and S. G. Lushnikov and A. Choubey and P. Gunter},
  journal= {arXiv preprint arXiv:cond-mat/0407712},
  year   = {2007}
}

Dynamics of cubic-tetragonal phase transition in KNbO$_3$ perovskite

Abstract

Keywords

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