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Coupling Lattice Instabilities Across the Interface in Ultrathin Oxide Heterostructures.
ACS Materials Letters ( IF 9.6 ) Pub Date : 2020-03-09 , DOI: 10.1021/acsmaterialslett.9b00540
Thierry C van Thiel 1 , Jennifer Fowlie 2 , Carmine Autieri 3, 4 , Nicola Manca 1 , Makars Šiškins 1 , Dmytro Afanasiev 1 , Stefano Gariglio 2 , Andrea D Caviglia 1
Affiliation  

Oxide heterointerfaces constitute a rich platform for realizing novel functionalities in condensed matter. A key aspect is the strong link between structural and electronic properties, which can be modified by interfacing materials with distinct lattice symmetries. Here, we determine the effect of the cubic-tetragonal distortion of SrTiO3 on the electronic properties of thin films of SrIrO3, a topological crystalline metal hosting a delicate interplay between spin-orbit coupling and electronic correlations. We demonstrate that below the transition temperature at 105 K, SrIrO3 orthorhombic domains couple directly to tetragonal domains in SrTiO3. This forces the in-phase rotational axis to lie in-plane and creates a binary domain structure in the SrIrO3 film. The close proximity to the metal–insulator transition in ultrathin SrIrO3 causes the individual domains to have strongly anisotropic transport properties, driven by a reduction of bandwidth along the in-phase axis. The strong structure–property relationships in perovskites make these compounds particularly suitable for static and dynamic coupling at interfaces, providing a promising route towards realizing novel functionalities in oxide heterostructures.

中文翻译:


超薄氧化物异质结构中界面上的耦合晶格不稳定性。



氧化物异质界面构成了在凝聚态物质中实现新颖功能的丰富平台。一个关键方面是结构和电子特性之间的紧密联系,可以通过具有不同晶格对称性的界面材料来改变这种联系。在这里,我们确定了 SrTiO 3的立方-四方畸变对 SrIrO 3薄膜电子特性的影响,SrIrO 3 是一种拓扑晶体金属,在自旋轨道耦合和电子关联之间具有微妙的相互作用。我们证明,在 105 K 的转变温度以下,SrIrO 3正交晶域直接与 SrTiO 3中的四方晶域耦合。这迫使同相旋转轴位于平面内并在SrIrO 3薄膜中产生二元畴结构。超薄 SrIrO 3中的金属-绝缘体转变非常接近,导致各个域具有强烈的各向异性传输特性,这是由沿同相轴的带宽减小驱动的。钙钛矿中强大的结构-性能关系使这些化合物特别适合界面处的静态和动态耦合,为实现氧化物异质结构中的新功能提供了一条有前途的途径。
更新日期:2020-04-23
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