Polar nature of domain boundaries in purely ferroelastic Pb3(PO4)2 investigated by second harmonic generation microscopy
Polar nature of domain boundaries in purely ferroelastic Pb3(PO4)2 investigated by second harmonic generation microscopy
复制标题
DOI：
10.1103/physrevb.100.024101
复制
发表时间：
2019-07
影响因子：
3.7
通讯作者：
H. Yokota;S. Matsumoto;E. Salje;Y. Uesu
中科院分区：
文献类型：
--
作者：
H. Yokota;S. Matsumoto;E. Salje;Y. Uesu
用二次谐波显微镜研究了磷酸铅中的畴界。结果表明，它们是极性的，而块体是一个纯粹的铁弹性，中心对称的材料。二次谐波显微镜观察表明，两个壁都是极性的，与宏观极性被对称性所禁止的体相形成鲜明对比。最强的极性观察到的W壁的局部对称性的单斜。墙壁也是单斜的，但对称2。因此，这种材料是一个新的候选人域边界感应铁电性，而大部分仍然完全不活跃。对壁施加小应力容易改变边界配置而不改变域边界的类型;即，W-壁性质是保守的。虽然到目前为止被建议作为声光开关的器件材料，但本研究增加了光散射也可以通过电场进行修改的可能性。
Domain boundaries in lead phosphate,, are investigated by using second harmonic generation (SHG) microscopy. It is revealed that they are polar while the bulk is a purely ferroelastic, centrosymmetric material.containsWandwalls with different orientations. The SHG microscopy shows that bothandwalls are polar, in striking contrast to the bulk, where the macroscopic polarity is forbidden by symmetry. The strongest polarity is observed in theWwalls with a local symmetry of monoclinic. Thewalls are also monoclinic but with symmetry 2. This material is hence a new candidate for domain-boundary-induced ferroelectricity while the bulk remains fully inactive. An application of small stress to aWwall easily changes the boundary configuration without changing the type of domain boundary; i.e., theW-wall nature is conserved. Whilewas so far suggested as a device material for acousto-optic switchers, the present study adds the possibility that light scattering can be modified also by electric fields.