用X射线和布里渊光散射研究PbZrO $_3$的晶格动力学和反铁电性
Lattice dynamics and antiferroelectricity in PbZrO$_3$ tested by X-ray and Brillouin light scattering
摘要：
我们报告的原型钙钛矿型反铁电PbZrO $_3$的临界动力学的综合研究结果。结合非弹性X射线和扩散X射线散射技术和布里渊光散射。结果表明，TA声子的色散是强各向异性的。在[1 1 0]方向传播的面内极化TA声子的色散曲线表现出明显的软化。发现R点处的激发变慢，表现为中心峰的增长。这种减慢太弱而不能被认为是相应的序参量的主要起源。所得到的结果进行处理的TA-到flexoelectric模式耦合。结果表明，PbZrO $_3$中的结构相变可以被认为是与铁电软模相关的唯一本征不稳定性的结果。
英文摘要：
We report the results of comprehensive study of the critical dynamics of the prototype perovskite antiferroelectric PbZrO$_3$. The combination of inelastic X-ray and diffuse X-ray scattering techniques and Brillouin light scattering was used. It is found that the dispersion of the TA phonons is strongly anisotropic. The dispersion curve of the in-plane polarized TA phonons propagating in [1 1 0] direction demonstrates pronounced softening. Slowing down of the excitations at R-point is found, it is manifested in growing of the central peak. This slowing down is too weak to be considered as a primary origin of the corresponding order parameter. Obtained results are treated in terms of TA--TO flexoelectric mode coupling. It is demonstrated that the structural phase transformation in PbZrO$_3$ can be considered as the result of the only intrinsic instability associated with the ferroelectric soft mode.
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