论文标题
六边形ABO的外观$ _3 $量子材料
Epitaxy of hexagonal ABO$_3$ quantum materials
论文作者
论文摘要
Hexagonal $ ab $ o $ _3 $氧化物（$ a $，$ b $ =阳离子）是实现新颖量子现象的丰富材料类。它们的六角形对称性，氧三角双锥体协调和准二维分层产生了与立方$ ab $ o $ $ $ _3 $ perovskites不同的属性。作为批量材料，此材料类中的大部分重点都放在稀土锰矿上，$ r $ mno $ _3 $（$ r $ =稀土）；这些材料表现出耦合的铁电和抗磁磁性。在这篇评论中，我们专注于六角形$ ab $ o $ $ _3 $氧化物的薄膜表现。我们涵盖了可用于模板六边形结构的六边形氧化物和底物的稳定性。我们展示了薄膜几何形状如何不仅允许进一步调整散装型锰矿，还可以实现结合铁电性与弱铁磁秩序的$ r $ feo $ _3 $之类的亚稳态六边形氧化物。薄膜几何形状是一个有前途的平台，可稳定额外的亚稳态六边形氧化物，以在该材料类别中寻找预测的高温超导性和拓扑相。
Hexagonal $AB$O$_3$ oxides ($A$, $B$ = cation) are a rich materials class for realizing novel quantum phenomena. Their hexagonal symmetry, oxygen trigonal bipyramid coordination and quasi-two dimensional layering give rise to properties distinct from those of the cubic $AB$O$_3$ perovskites. As bulk materials, most of the focus in this materials class has been on the rare earth manganites, $R$MnO$_3$ ($R$ = rare earth); these materials display coupled ferroelectricity and antiferromagnetic order. In this review, we focus on the thin film manifestations of the hexagonal $AB$O$_3$ oxides. We cover the stability of the hexagonal oxides and substrates which can be used to template the hexagonal structure. We show how the thin film geometry not only allows for further tuning of the bulk-stable manganites but also the realization of metastable hexagonal oxides such as the $R$FeO$_3$ that combine ferroelectricity with weak ferromagnetic order. The thin film geometry is a promising platform to stabilize additional metastable hexagonal oxides to search for predicted high-temperature superconductivity and topological phases in this materials class.
