光激发电荷有序La $_{1/3}$ Sr $_{2/3}$ FeO $_3$中电子恢复的非常规减慢
Unconventional slowing down of electronic recovery in photoexcited charge-ordered La$_{1/3}$Sr$_{2/3}$FeO$_3$
摘要：
有序的电子相是密切相关的新兴现象，如高Tc超导和巨磁阻。电子电荷与其他自由度（如晶格和自旋）的耦合是关联系统中的核心问题。它们的相关性已经从飞秒到皮秒的时间尺度进行了深入的研究，而超过纳秒的有序电子相的动力学通常被认为是遵循一个琐事热驱动的恢复。在这里，我们报告了一个不寻常的放缓的电子相的恢复跨越一阶相变，远远超过热弛豫时间。在光激发之后，当样品温度接近相变温度时，从La $_{1/3}$ Sr $_{2/3}$ FeO $_3$薄膜中的电荷有序超结构的瞬态光反射率和X射线衍射强度的恢复时间比独立测量的晶格冷却时间长几个数量级。结合实验和理论研究表明，电子恢复的放缓对应的伪临界动力学，起源于磁相互作用接近弱一级相变。这种异常长的电子恢复时间证实了有序电子相与磁性的相互作用超出了相关系统中的热过程。
英文摘要：
Ordered electronic phases are intimately related to emerging phenomena such as high Tc superconductivity and colossal magnetoresistance. The coupling of electronic charge with other degrees of freedom such as lattice and spin are of central interest in correlated systems. Their correlations have been intensively studied from femtosecond to picosecond time scales, while the dynamics of ordered electronic phases beyond nanoseconds are usually assumed to follow a trivia thermally driven recovery. Here, we report an unusual slowing down of the recovery of an electronic phase across a first-order phase transition, far beyond thermal relaxation time. Following optical excitation, the recovery time of both transient optical reflectivity and x-ray diffraction intensity from a charge-ordered superstructure in a La$_{1/3}$Sr$_{2/3}$FeO$_3$ thin film increases by orders of magnitude longer than the independently measured lattice cooling time when the sample temperature approaches the phase transition temperature. The combined experimental and theoretical investigations show that the slowing down of electronic recovery corresponds to the pseudo-critical dynamics that originates from magnetic interactions close to a weakly first-order phase transition. This extraordinary long electronic recovery time exemplifies an interplay of ordered electronic phases with magnetism beyond thermal processes in correlated systems.
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