论文标题
$ 180^{\ circ} $的极性相过渡 - 铅滴定铅墙
Polar phase transition in $180^{\circ}$-domain wall of lead titanate
论文作者
论文摘要
提出了一种导致铁电域壁（DW）中可切换极化的新机制。主阶参数及其梯度的生物偶联耦合会触发DW中的相变，其局部极性模式的软化和相变温度$ t_ {dw} $在局部极性模式的软化和易感性的异常增加。该机制描述了PBTIO $ _3 $的$ 180^\ Circ-dw中极地Bloch和AntpolarNéel组件的起源和特性，最近从第一原理计算中报道了这一点。
A new mechanism leading to a switchable polarization in a ferroelectric domain wall (DW) is proposed. A biquadratic coupling of the primary order parameter and its gradient triggers the phase transition in the DW with softening of the local polar mode and anomalous increase of the susceptibility at the phase transition temperature $T_{DW}$. This mechanism describes the origin and properties of the polar Bloch and antipolar Néel components in the $180^\circ$-DW of PbTiO$_3$, which were recently reported from first-principles calculations.
