Phase Transition Dynamics in a Complex Oxide Heterostructure,Physical Review Letters

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Phase Transition Dynamics in a Complex Oxide Heterostructure
Physical Review Letters ( IF 8.1 ) Pub Date : 2022-11-30 , DOI: 10.1103/physrevlett.129.235701
Qingteng Zhang ₁ , Guoxiang Hu _{2,

3} , Vitalii Starchenko ₄ , Gang Wan ₅ , Eric M Dufresne ₁ , Yongqi Dong ₅ , Huajun Liu ₆ , Hua Zhou ₁ , Hyoungjeen Jeen ₇ , Kayahan Saritas ₇ , Jaron T Krogel ₇ , Fernando A Reboredo ₇ , Ho Nyung Lee ₇ , Alec R Sandy ₁ , Irene Calvo Almazan ₅ , Panchapakesan Ganesh ₂ , Dillon D Fong ₅

Affiliation

Understanding the behavior of defects in the complex oxides is key to controlling myriad ionic and electronic properties in these multifunctional materials. The observation of defect dynamics, however, requires a unique probe—one sensitive to the configuration of defects as well as its time evolution. Here, we present measurements of oxygen vacancy ordering in epitaxial thin films of

{SrCoO}_{x}

and the brownmillerite-perovskite phase transition employing x-ray photon correlation spectroscopy. These and associated synchrotron measurements and theory calculations reveal the close interaction between the kinetics and the dynamics of the phase transition, showing how spatial and temporal fluctuations of heterointerface evolve during the transformation process. The energetics of the transition are correlated with the behavior of oxygen vacancies, and the dimensionality of the transformation is shown to depend strongly on whether the phase is undergoing oxidation or reduction. The experimental and theoretical methods described here are broadly applicable to in situ measurements of dynamic phase behavior and demonstrate how coherence may be employed for novel studies of the complex oxides as enabled by the arrival of fourth-generation hard x-ray coherent light sources.

中文翻译：

复杂氧化物异质结构中的相变动力学

了解复合氧化物中缺陷的行为是控制这些多功能材料中无数离子和电子特性的关键。然而，缺陷动力学的观察需要一个独特的探针——一个对缺陷的配置及其时间演变敏感的探针。在这里，我们介绍了外延薄膜中氧空位排序的测量

{钴酸锶}_{X}

以及采用 X 射线光子相关光谱法的褐钙钛矿-钙钛矿相变。这些以及相关的同步加速器测量和理论计算揭示了相变动力学和动力学之间的密切相互作用，显示了异质界面在转换过程中的空间和时间波动如何演变。转变的能量学与氧空位的行为相关，并且转变的维数显示在很大程度上取决于相是否正在经历氧化或还原。此处描述的实验和理论方法广泛适用于原位动态相位行为的测量，并展示如何将相干性用于第四代硬 X 射线相干光源的到来所实现的复杂氧化物的新研究。

更新日期：2022-12-01

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