Evolution of electronic correlations across the rutile, perovskite, and Ruddelsden-Popper iridates with octahedral connectivity
Evolution of electronic correlations across the rutile, perovskite, and Ruddelsden-Popper iridates with octahedral connectivity
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DOI：
10.1103/physrevb.94.121104
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发表时间：
2016-09-06
影响因子：
3.7
通讯作者：
Shen, Kyle M.
中科院分区：
文献类型：
--
作者：
Kawasaki, Jason K.;Uchida, Masaki;Shen, Kyle M.
电子关联和自旋轨道相互作用的汇合是在5d过渡金属氧化物中实现量子相的关键。在这里，我们研究了有效电子关联的强度如何在一系列d（5）铱酸盐组成的IrO 6八面体，从层状相关绝缘体Sr 2 IrO 4，三维钙钛矿半金属SrIrO 3，金属金红石IrO 2，其中八面体排列在一个混合的边和角共享网络的演变。通过反应氧化物分子束外延，原位角分辨光电子能谱，芯能级光电子能谱和密度泛函理论的组合，我们展示了如何有效的电子相关性减弱的IrO 6网络和p-d杂化的连接性增加的函数。我们的研究结果表明，结构和连接可以用来控制的强度的相关性的虹膜。
The confluence of electron correlations and spin-orbit interactions is critical to realizing quantum phases in 5d transition metal oxides. Here, we investigate how the strength of the effective electron correlations evolve across a series of d(5) iridates comprised of IrO6 octahedra, ranging from the layered correlated insulator Sr2IrO4, to the three-dimensional perovskite semimetal SrIrO3, to metallic rutile IrO2 in which the octahedra are arranged in a mixed edge and corner sharing network. Through a combination of reactive oxide molecular-beam epitaxy, in situ angle-resolved photoemission spectroscopy, core level photoemission, and density functional theory, we show how the effective electron correlations weaken as a function of increasing connectivity of the IrO6 network and p-d hybridization. Our results demonstrate how structure and connectivity can be used to control the strength of correlations in the iridates.