Soft Mode Dynamics Above and Below the Burns Temperature in the Relaxor Pb(Mg₁/3Nb₂/3)O₃

2001/08/31 by P. M. Gehring, S. Wakimoto, Zuo‐Guang Ye +2 · 6 citations
Engineering · Materials Science · Physics and Astronomy · #Acoustic Wave Resonator Technologies #Ferroelectric and Piezoelectric Materials #Photorefractive and Nonlinear Optics #cond-mat.mtrl-sci

paper · pdf · doi:10.1103/physrevlett.87.277601

published as Phys. Rev. Lett. 87, 277601 (2001) · 4 pages, 4 figures; modified discussion of Fig. 3, shortened captions, added reference, corrected typos, accepted by Phys. Rev. Lett

arxiv created 2001/11/07 · openalex publication_date 2001/12/11 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

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 ~ 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 PNR.

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