论文标题
NIO中的Exchange-Striction驱动的超快非热晶格动力学
Exchange-striction driven ultrafast nonthermal lattice dynamics in NiO
论文作者
论文摘要
我们使用飞秒电子衍射来研究高度相关的抗铁磁（AF）半导体NIO中的超快晶格动力学。使用Bragg衍射的散射载体（Q）依赖性，我们引入了Q分解的有效晶格温度，并与Ni离子相比，识别具有优先位移的非热晶格状态，该状态在〜0.3 ps之内，并持续使用25 ps。我们将其与瞬态变化相关联，与AF交换效果诱导的晶格失真，并由弗里德尔对的瞬态Q-空压对称性得到支持。我们的观察结果突出了自旋晶格耦合在超快控制自旋顺序的路线中的作用。
We use femtosecond electron diffraction to study ultrafast lattice dynamics in the highly correlated antiferromagnetic (AF) semiconductor NiO. Using the scattering vector (Q) dependence of Bragg diffraction, we introduce a Q-resolved effective lattice temperature, and identify a nonthermal lattice state with preferential displacement of O compared to Ni ions, which occurs within ~0.3 ps and persists for 25 ps. We associate this with transient changes to the AF exchange striction-induced lattice distortion, supported by the observation of a transient Q-asymmetry of Friedel pairs. Our observation highlights the role of spin-lattice coupling in routes towards ultrafast control of spin order.
