Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.
Nat Commun. 2016 Sep 6;7:12721. doi: 10.1038/ncomms12721.
Strong Coulomb repulsion and spin-orbit coupling are known to give rise to exotic physical phenomena in transition metal oxides. Initial attempts to investigate systems, where both of these fundamental interactions are comparably strong, such as 3d and 5d complex oxide superlattices, have revealed properties that only slightly differ from the bulk ones of the constituent materials. Here we observe that the interfacial coupling between the 3d antiferromagnetic insulator SrMnO3 and the 5d paramagnetic metal SrIrO3 is enormously strong, yielding an anomalous Hall response as the result of charge transfer driven interfacial ferromagnetism. These findings show that low dimensional spin-orbit entangled 3d-5d interfaces provide an avenue to uncover technologically relevant physical phenomena unattainable in bulk materials.
强库仑排斥和自旋轨道耦合已知会在过渡金属氧化物中产生奇异的物理现象。最初尝试研究这两种基本相互作用都相当强的系统，如 3d 和 5d 复杂氧化物超晶格，结果表明其性质与组成材料的体相仅略有不同。在这里，我们观察到 3d 反铁磁绝缘体 SrMnO3 和 5d 顺磁金属 SrIrO3 之间的界面耦合非常强，导致电荷转移驱动的界面铁磁性产生异常的 Hall 响应。这些发现表明，低维自旋轨道纠缠的 3d-5d 界面为揭示在体材料中无法获得的技术相关物理现象提供了途径。
