Angle-resolved polarized Raman scattering on relaxor ferroelectrics with intermediate random fields
Angle-resolved polarized Raman scattering on relaxor ferroelectrics with intermediate random fields
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DOI：
10.7567/jjap.57.11ub08
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发表时间：
2018-09
影响因子：
1.5
通讯作者：
Md Al Helal;S. Tsukada;Šarūnus Svirskas;J. Banys;S. Kojima
中科院分区：
文献类型：
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作者：
Md Al Helal;S. Tsukada;Šarūnus Svirskas;J. Banys;S. Kojima
分析弛豫铁电体中由随机场形成的局域结构，对于理解巨压电性的起源具有重要的技术和基础意义。我们测量了Pb（Mg_（1/3）Nb_（2/3））O_3-PbTiO_3单晶的偏振拉曼散射的温度、电场和角度依赖性。在顺电立方相中测量了拉曼活性模强度与偏振面旋转角的依赖关系。通过假设局部R3 m对称性来比较实验数据，从理论上计算这些角度依赖性。在顺电立方相中施加的电场抑制了无规场，因此观察到拉曼张量分量的比率从零场的结果的变化。在足够高的电场下，角度变化从其零场行为完全改变。这表明电场诱导的四对称性的出现。
The analysis of the local structure formed by random fields in relaxor ferroelectrics is of technical and fundamental importance in understanding the origin of colossal piezoelectricity. We determined the temperature, electric field, and angular dependences of polarized Raman scattering in Pb(Mg1/3Nb2/3)O3–PbTiO3 single crystals. The dependence of the intensity of a Raman active mode on the rotation angle of a polarization plane is measured in a paraelectric cubic phase. These angular dependences are calculated theoretically by assuming the local R3m symmetry to compare the experimental data. The applied electric field in a paraelectric cubic phase suppresses the random fields and therefore the change in the ratio of Raman tensor components from the result at zero field is observed. At a sufficiently higher electric field, the angular variation changes perfectly from its zero field behavior. This indicates the appearance of tetragonal symmetry induced by an electric field.