论文标题
通过环境原位加热纳米梁电子衍射研究的钙钛矿薄膜中的相过渡
Phase transitions in a perovskite thin film studied by environmental in-situ heating nano-beam electron diffraction
论文作者
论文摘要
散装pr $ _ {1-x} $ ca $ _ {x} $ mno $ _3 $的丰富相图导致物理性能的高可调性增加了与基本研究以及材料的潜在应用有关的各种研究。重要的是，由于强烈的相关效应，电子和晶格的自由度被剧烈耦合。因此，是否可以将这种散装相图转移到固有的紧张的外延薄膜中是有争议的。在本文中，以$ x = 0.1 $为$ x = 0.1 $的结构矫正到伪立方体过渡，在离子束溅射的薄膜中研究，并通过采用原位加热纳米梁电子衍射来遵循晶格常量的温度依赖性，指出了各自的散装系统的差异。另外，证明在加热过程中控制环境，即防止氧损失，对于避免不可逆的结构变化至关重要，这预计是在非平衡条件下含有挥发性元素的化合物的一般问题。
The rich phase diagram of bulk Pr$_{1-x}$Ca$_{x}$MnO$_3$ resulting in a high tunability of physical properties gave rise to various studies related to fundamental research as well as prospective applications of the material. Importantly, as a consequence of strong correlation effects, electronic and lattice degrees of freedom are vigorously coupled. Hence, it is debatable whether such bulk phase diagrams can be transferred to inherently strained epitaxial thin films. In this paper, the structural orthorhombic to pseudo-cubic transition for $x=0.1$ is studied in ion-beam sputtered thin films and point out differences to the respective bulk system by employing in-situ heating nano-beam electron diffraction to follow the temperature dependence of lattice constants. In addition, it is demonstrated that controlling the environment during heating, i.e. preventing oxygen loss, is crucial in order to avoid irreversible structural changes, which is expected to be a general problem of compounds containing volatile elements under non-equilibrium conditions.
