论文信息 - An inelastic neutron scattering study of the phase transformation of RbD3(SeO3)2

An inelastic neutron scattering study of the phase transformation of RbD3(SeO3)2

The phase transition of rubidiumtrideuteroselenite RbD3 (SeO3)2 at 152K to a ferroelectric state is investigated by the inelastic scattering of neutrons. It is verified that the transformation is driven by a soft zone boundary mode (Z-point) and thus belongs to the class of improper ferroelectric transitions. The critical scattering is shown to be cigar-shaped and this corresponds to a 'valley' of the quasiharmonic dispersion surface or weakly correlated planes in real space. The weak interaction between planes can be understood by a comparison of the high and low temperature structure.

H. Grimm | W. Fitzgerald

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