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A possible scenario for two soft branches in PMN

机译：PMN中两个软分支的可能方案

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摘要

The acoustic-optic mode coupling model proposed earlier as a framework for interpretation of the apparent vertical soft optic mode branch dispersion in lead-based perovskite relaxors has been tentatively extended by taking into account the two-component nature of the lowest frequency optic phonon mode. Inelastic scattering spectral function and the course of the apparent phonon dispersion branches were calculated for parameters relevant to Pb(Mg _(1/3)Nb_(2/3))O_3 (PMN) relaxor. Dynamical parameters of the zone-centre soft mode components in the problematic region around the Burns temperature have been described with the help of the recent hyper-Raman scattering study [A. Al-Zein, J. Hlinka, J. Rouquette, and B. Hehlen, Soft mode doublet in PbMg_(1/3)Nb_(2/3)O_3 relaxor investigated with hyper-Raman scattering, Phys. Rev. Lett. 105 (2010), p. 017601] on PMN. We show that the vertical dispersion (waterfall anomaly) is primarily due to the coupling of the transverse acoustic branch to the lower frequency component of the TO1 phonon branch. As in the inelastic neutron scattering experiments, in this model the temperature interval in which the vertical dispersion (waterfall anomaly) appears is roughly restricted by the freezing and Burns temperatures.
机译：考虑到最低频率的声子波模的两分量性质，较早地提出了声光模耦合模型，作为解释铅基钙钛矿弛豫器中表观垂直软光模分支扩散的框架。计算与Pb（Mg _（1/3）Nb_（2/3））O_3（PMN）弛豫有关的参数的非弹性散射谱函数和表观声子色散分支的过程。在最近的超拉曼散射研究的帮助下，已经描述了在Burns温度附近有问题的区域中的区域中心软模式组件的动力学参数。 Al-Zein，J.Hlinka，J.Rouquette和B.Hehlen，PbMg_（1/3）Nb_（2/3）O_3弛豫器中的软模双峰通过超拉曼散射研究。牧师105（2010），第017601]在PMN上。我们表明，垂直色散（瀑布异常）主要是由于横向声支耦合到TO1声子支的低频分量所致。与非弹性中子散射实验一样，在该模型中，垂直扩散（瀑布异常）出现的温度区间大致受冻结和燃烧温度的限制。

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