论文标题
电场驱动的八面体旋转
Electric field driven octahedral rotation in perovskite
论文作者
论文摘要
MO6（M =过渡金属）八面体的旋转是钙钛矿材料物理特性的关键决定因素。因此，可以通过控制八面体旋转（OR）来实现凝结物质研究中最重要的目标之一的物理性质之一。在这项研究中，证明或可以由SR $ _2 $ ruo $ _4 $的电场驱动或可以驱动。 Sr $ _2 $ ruo $ _4 $的表面层旋转的八面制旋转的八人体在用K给出表面时将其恢复为无座的散装结构。理论研究表明，或者在SR $ _2 $ _2 $ _2 $ _4 $中，源自表面电场，这可以通过超过k层的筛选效应来调节。这项工作不仅可以通过电场引起或角度的变化，而且还提供了一种控制或控制的方法，这是迈向对钙钛矿氧化物物理特性的原位控制的重要步骤。
Rotation of MO6 (M = transition metal) octahedra is a key determinant of the physical properties of perovskite materials. Therefore, tuning physical properties, one of the most important goals in condensed matter research, may be accomplished by controlling octahedral rotation (OR). In this study, it is demonstrated that OR can be driven by an electric field in Sr$_2$RuO$_4$. Rotated octahedra in the surface layer of Sr$_2$RuO$_4$ are restored to the unrotated bulk structure upon dosing the surface with K. Theoretical investigation shows that OR in Sr$_2$RuO$_4$ originates from the surface electric field, which can be tuned via the screening effect of the overlaid K layer. This work establishes not only that variation in the OR angle can be induced by an electric field, but also provides a way to control OR, which is an important step towards in situ control of the physical properties of perovskite oxides.
