Charge-ordering-induced polar domains and domain walls in a bilayered manganite Pr(Sr0.15Ca0.85)2Mn2O7
Charge-ordering-induced polar domains and domain walls in a bilayered manganite Pr(Sr0.15Ca0.85)2Mn2O7
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DOI：
10.1063/1.3284658
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发表时间：
2010-01
影响因子：
4
通讯作者：
H. Itoh;Y. Tokunaga;N. Kida;R. Shimano;Y. Tokura
中科院分区：
文献类型：
--
作者：
H. Itoh;Y. Tokunaga;N. Kida;R. Shimano;Y. Tokura
用二次谐波显微镜观察了双层锰氧化物Pr(Sr0.15Ca0.85)2Mn2O7中的电荷有序诱导的极磁畴和磁畴壁。在转变温度TC∼306K附近，观察到具有自发极化的磁畴的形核过程。远低于TC的特征带状暗图案在二次谐波图像中被识别出来。根据成核特征的类比，它们可以归结为分离反平行极化域的离散小波结构。DW的各向异性是由电荷和轨道有序性的几何约束决定的，而不是像传统的铁电DWS那样由静电稳定性决定的。
We have observed charge-ordering-induced polar domains and domain walls (DWs) in a bilayered manganite Pr(Sr0.15Ca0.85)2Mn2O7 using second-harmonic-generation microscopy. Around the transition temperature TC∼306 K, a nucleation process of the domains with spontaneous polarization is clearly observed. Well below TC, the characteristic band-shaped dark patterns are identified in the second-harmonic images. On the analogy of the nucleation feature, they can be assigned to the DWs separating antiparallel polar domains. The anisotropy in the DW is governed by the geometrical constraint of the charge and orbital ordering, not by the electrostatic stability as in conventional ferroelectric DWs.