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Spatially Controlled Octahedral Rotations and Metal–Insulator Transitions in Nickelate Superlattices
Nano Letters ( IF 10.8 ) Pub Date : 2021-01-20 , DOI: 10.1021/acs.nanolett.0c03850 Binbin Chen 1 , Nicolas Gauquelin 2 , Robert J. Green 3, 4 , Jin Hong Lee 5 , Cinthia Piamonteze 6 , Matjaž Spreitzer 7 , Daen Jannis 2 , Johan Verbeeck 2 , Manuel Bibes 5 , Mark Huijben 1 , Guus Rijnders 1 , Gertjan Koster 1
Nano Letters ( IF 10.8 ) Pub Date : 2021-01-20 , DOI: 10.1021/acs.nanolett.0c03850 Binbin Chen 1 , Nicolas Gauquelin 2 , Robert J. Green 3, 4 , Jin Hong Lee 5 , Cinthia Piamonteze 6 , Matjaž Spreitzer 7 , Daen Jannis 2 , Johan Verbeeck 2 , Manuel Bibes 5 , Mark Huijben 1 , Guus Rijnders 1 , Gertjan Koster 1
Affiliation
The properties of correlated oxides can be manipulated by forming short-period superlattices since the layer thicknesses are comparable with the typical length scales of the involved correlations and interface effects. Herein, we studied the metal–insulator transitions (MITs) in tetragonal NdNiO3/SrTiO3 superlattices by controlling the NdNiO3 layer thickness, n in the unit cell, spanning the length scale of the interfacial octahedral coupling. Scanning transmission electron microscopy reveals a crossover from a modulated octahedral superstructure at n = 8 to a uniform nontilt pattern at n = 4, accompanied by a drastically weakened insulating ground state. Upon further reducing n the predominant dimensionality effect continuously raises the MIT temperature, while leaving the antiferromagnetic transition temperature unaltered down to n = 2. Remarkably, the MIT can be enhanced by imposing a sufficiently large strain even with strongly suppressed octahedral rotations. Our results demonstrate the relevance for the control of oxide functionalities at reduced dimensions.
中文翻译:
镍酸盐超晶格中的空间控制八面体旋转和金属-绝缘体转变
相关的氧化物的性质可以通过形成短周期的超晶格来控制,因为层的厚度可以与所涉及的相关性和界面效应的典型长度尺度相媲美。在本文中,我们通过控制界面单元八面体耦合的长度尺度,通过控制晶胞中NdNiO 3层的厚度n,研究了四方NdNiO 3 / SrTiO 3超晶格中的金属-绝缘体转变(MITs)。扫描透射电子显微镜揭示了从交叉调制的八面体上层建筑在Ñ = 8至均匀nontilt图案在Ñ = 4,并伴有显着减弱绝缘基态。经进一步减少n主要的尺寸效应会不断提高MIT温度,而反铁磁转变温度不会降低到n =2。值得注意的是,即使强力抑制八面体旋转,也可以通过施加足够大的应变来增强MIT。我们的结果证明了在减小尺寸的情况下控制氧化物功能的重要性。
更新日期:2021-02-10
中文翻译:
镍酸盐超晶格中的空间控制八面体旋转和金属-绝缘体转变
相关的氧化物的性质可以通过形成短周期的超晶格来控制,因为层的厚度可以与所涉及的相关性和界面效应的典型长度尺度相媲美。在本文中,我们通过控制界面单元八面体耦合的长度尺度,通过控制晶胞中NdNiO 3层的厚度n,研究了四方NdNiO 3 / SrTiO 3超晶格中的金属-绝缘体转变(MITs)。扫描透射电子显微镜揭示了从交叉调制的八面体上层建筑在Ñ = 8至均匀nontilt图案在Ñ = 4,并伴有显着减弱绝缘基态。经进一步减少n主要的尺寸效应会不断提高MIT温度,而反铁磁转变温度不会降低到n =2。值得注意的是,即使强力抑制八面体旋转,也可以通过施加足够大的应变来增强MIT。我们的结果证明了在减小尺寸的情况下控制氧化物功能的重要性。