Soft Mode Dynamics Above and Below the Burns Temperature in the Relaxor Pb(Mg1/3Nb2/3)O3
P. M. Gehring, S. Wakimoto, Z. -G. Ye, G. Shirane
Abstract
We report neutron inelastic scattering measurements of the lowest-energy transverse optic (TO) phonon branch in the relaxor Pb(Mg1/3Nb2/3)O3 from 400 to 1100 K. Far above the Burns temperature Td ~ 620 K we observe well-defined propagating TO modes at all wave vectors q, and a zone center TO mode that softens in a manner consistent with that of a ferroelectric soft mode. Below Td the zone center TO mode is overdamped. This damping extends up to, but not above, the waterfall wave vector qwf, which is a measure of the average size of the PNR.
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