AI Article Synopsis
- Neutron inelastic scattering measurements were conducted on the transverse optic (TO) phonon branch of relaxor Pb(Mg1/3Nb2/3)O3 over a temperature range of 400 to 1100 K.
- At temperatures well above the Burns temperature (approximately 620 K), well-defined TO modes were observed at all wave vectors, with a zone center mode softening similarly to a ferroelectric soft mode.
- Below the Burns temperature, the zone center TO mode became overdamped, with this damping behavior extending up to the waterfall wave vector, which indicates the average size of polar nanoregions.
Article 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 T(d) approximately 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 T(d) the zone center TO mode is overdamped. This damping extends up to, but not above, the waterfall wave vector q(wf), which is a measure of the average size of the polar nanoregions.
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| http://dx.doi.org/10.1103/PhysRevLett.87.277601 | DOI Listing |
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