BaTiO$_3$晶体中源自超畴边界的带电畴壁
Charged domain walls in BaTiO$_3$ crystals emerging from superdomain boundaries
AI总结：
本研究通过原位光学观测BaTiO₃单晶电场极化过程，揭示瞬态超畴边界转化为带电畴壁的机制，并结合Wechsler-Lieberman-Read理论解释畴形成过程，明确补偿电荷输运与超畴壁、相界运动的关联。
摘要：
此前针对BaTiO$_3$单晶的实验表明，在铁电相变附近施加电场，可引入特殊的持久铁电畴壁，同时伴随以二维电子气形式存在的补偿电荷。本研究对该电场极化过程开展的原位光学观测显示，过程中会形成立方相和铁电相的瞬态共存态，其中铁电相被分割为多个马氏体超畴，超畴之间由超畴壁分隔。研究揭示，随着瞬态超畴转变为常规铁电畴，超畴边界会转化为目标带电畴壁。为了对观测到的瞬态畴图案进行归类，理解观测到的铁电析出相及其团聚体的形态，并为观测到的畴形成过程提供整体解释，本研究在Wechsler-Lieberman-Read理论框架下推导了共存超畴态力学相容性的影响。研究结果还表明，补偿电荷载流子向最终带电畴壁位置的输运，与超畴壁和相界的电导率以及二者的联动运动和生长直接相关。
英文摘要：
Previous experiments with BaTiO$_3$ single crystals have shown that application of the electric field in the vicinity of the ferroelectric phase transition can be used to introduce peculiar persisting ferroelectric domain walls, accompanied by the compensating charge in the form of two-dimensional electron gas. The present in-situ optical observations of such electric poling process reveal formation of a transient coexistence of the cubic and ferroelectric phases, the latter one being broken into multiple martensitic superdomains, separated by superdomain walls. It is revealed that as the transient superdomains convert into the regular ferroelectric domains, the superdomain boundaries transform into the desired charged domain walls. In order to assign the observed transient domain patterns, to understand the shapes of the observed ferrolectric precipitates and their agglomerates as well as to provide the overall interpretation of the observed domain formation process, the implications of the mechanical compatibility of the coexisting superdomain states is derived in the framework of the Wechsler-Lieberman-Read theory. The results also suggest that the transport of the compensating charge carriers towards the final charged domain wall location is directly associated with the electric conductivity and interlinked motion and growth of the superdomain walls and phase fronts.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
