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

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arxiv cond-mat/0407712 v1 pith:PSPOJ2TV submitted 2004-07-27 cond-mat.mtrl-sci

S.N. Gvasaliya , B. Roessli , R.A. Cowley , S.G. Lushnikov , A. Choubey , P. Gunter This is my paper
classification cond-mat.mtrl-sci
keywords componentquasi-elasticscatteringacousticinelasticknboneutronphase
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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$_C$.

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