Origin of the "Waterfall" Effect in Phonon Dispersion of Relaxor Perovskites

Details Origin of the "Waterfall" Effect in Phonon Dispersion of Relaxor Perovskites Origin of the "Waterfall" Effect in Phonon Dispersion of Relaxor Perovskites

2003-06-27

arxiv.org/abs/cond-mat/0306692v1

Physics

Condensed Matter

Materials Science

4 pages, 6 figures, LaTeX

Scientific paper

10.1103/PhysRevLett.91.107602

Inelastic neutron scattering study of the perovskite relaxor ferroelectric PZN:8%PT elucidates the origin of the previously reported unusual kink on the low frequency transverse phonon dispersion curve (known as "waterfall" effect). We show that its position depends on the choice of the Brillouin zone and that the relation of its position to the size of the polar nanoregions is highly improbable. The observation is explained in the framework of a simple model of coupled damped harmonic oscillators representing the acoustic and optic phonon branches.

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