论文标题
界面 - 杂交修饰的IR铁磁性和电子结构在Lamno $ _3 $/sriro $ _3 $ superlattices
Interfacial-hybridization-modified Ir Ferromagnetism and Electronic Structure in LaMnO$_3$/SrIrO$_3$ Superlattices
论文作者
论文摘要
人工制造的3 $ D $/5 $ D $ SUPERTATTICES（SLS）涉及强型电子相关性和一种通过界面3 $ D $ -5 $ d $耦合的材料中的旋转轨道耦合，其机制仍未开发。在这项工作中，我们通过多种光谱方法调查了Lamno $ _3 $/sriro $ _3 $ sls的界面耦合机制。硬X射线吸收，磁性圆形二色性和光发射光谱证明了IR铁磁磁性的系统变化和SL重复期的变化。第一原理的计算进一步揭示了界面电子结构和IR矩的局部特性的SL周期依赖性的机制，证实了IR-MN分子轨道的形成是界面偶联效应的原因。 IR磁矩的自旋和轨道成分之间的比率的SL周期依赖性归因于界面分子轨道形成期间电子自旋的重组。我们的结果阐明了该原型3 $ d $/5 $ d $ SL系统中界面耦合的性质，结论将阐明对其他强相关和旋转轨道耦合的氧化物异方差的研究。
Artificially fabricated 3$d$/5$d$ superlattices (SLs) involve both strong electron correlation and spin-orbit coupling in one material by means of interfacial 3$d$-5$d$ coupling, whose mechanism remains mostly unexplored. In this work we investigated the mechanism of interfacial coupling in LaMnO$_3$/SrIrO$_3$ SLs by several spectroscopic approaches. Hard x-ray absorption, magnetic circular dichroism and photoemission spectra evidence the systematic change of the Ir ferromagnetism and the electronic structure with the change of the SL repetition period. First-principles calculations further reveal the mechanism of the SL-period dependence of the interfacial electronic structure and the local properties of the Ir moments, confirming that the formation of Ir-Mn molecular orbital is responsible for the interfacial coupling effects. The SL-period dependence of the ratio between spin and orbital components of the Ir magnetic moments can be attributed to the realignment of electron spin during the formation of the interfacial molecular orbital. Our results clarify the nature of interfacial coupling in this prototypical 3$d$/5$d$ SL system and the conclusion will shed light on the study of other strongly correlated and spin-orbit coupled oxide hetero-interfaces.
