Soft mode dynamics above and below the burns temperature in the relaxor Pb(Mg1/3Nb2/3)O3 -: art. no. 277601

被引：156

作者：

Gehring, PM ^{[1
]}

Wakimoto, S

Ye, ZG

Shirane, G

机构：

[1] Natl Inst Stand & Technol, Ctr Neutron Res, Gaithersburg, MD 20899 USA

[2] Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada

[3] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA

[4] Simon Fraser Univ, Dept Chem, Burnaby, BC V5A 1S6, Canada

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 87卷 / 27期

关键词：

D O I：

10.1103/PhysRevLett.87.277601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report neutron inelastic scattering measurements of the lowest-energy transverse optic (TO) phonon branch in the relaxor Pb(Mg1/3Nb2/3)O-3 from 400 to 1100 K. Far above the Bums temperature T(d)similar to 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.

引用

页码：277601 / 277601

页数：4

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