Abstract
We have undertaken an inelastic neutron scattering study of the perovskite relaxor ferroelectric [Formula presented] with 8% [Formula presented] (PZN-8%PT) in order to elucidate the origin of the previously reported unusual kink on the low frequency transverse phonon dispersion curve (known as the “waterfall effect”). We show that its position ([Formula presented]) depends on the choice of the Brillouin zone and that the relation of [Formula presented] to the size of the polar nanoregions is highly improbable. The waterfall phenomenon is explained in the framework of a simple model of coupled damped harmonic oscillators representing the acoustic and optic phonon branches.
Original language | English (US) |
---|---|
Journal | Physical review letters |
Volume | 91 |
Issue number | 10 |
DOIs | |
State | Published - Sep 5 2003 |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy