Nickelate heterostructures as a laboratory for many-body physics

镍异质结构作为多体物理实验室

• 批准号: 173750116
• 负责人: Professorin Dr. Ute Kaiser
• 金额: --
• 依托单位: Max-Planck-Institut für Festkörperforschung (MPI-FKF)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/173750116?language=en
• 关键词: Nickelate; heterostructures; laboratory; many; body

Multilayers with precisely controlled interfaces between two different materials can give rise to novel physical phenomena and functionalities not exhibited by either of the constituents alone, like the quantum Hall effect in semiconductor multilayers and the “giant magnetoresistance” in multilayers of simple metals. Interfaces between transition-metal oxides can exhibit properties not observed at semiconductor or ordinary metal interfaces, such as emergent superconductivity and ferromagnetism, opening a path towards a new generation of electronic devices. In this project, multilayers and superlattices based on nickelates with perovskite structure will be synthesized with atomic precision using pulsed-laser deposition, and investigated with resonant X-ray linear/circular dichroism and reflectometry, spectral ellipsometry, aberration-corrected high-resolution transmission electron microscopy (ACHRTEM) and electron energy loss spectroscopy (EELS). The goal of this investigation is a detailed understanding of the relationship between the atomic structure and the electronic properties at the interfaces, with particular focus on the valence states, orbital occupation, and charge transport. The electronic interactions at the interface will then be manipulated in a controlled fashion by varying the thickness and chemical composition of the constituent layers, the strain imposed by the substrate, and the concentration of defects. Ultimately, we strive to realize new quantum phases, including a high-temperature superconducting phase predicted in prior theoretical work.

在两种不同材料之间精确控制界面的多层材料可以产生新的物理现象和功能，这些现象和功能不是单独由任何一种成分表现出来的，比如半导体多层材料中的量子霍尔效应和简单金属多层材料中的“巨磁电阻”。过渡金属氧化物之间的界面可以表现出在半导体或普通金属界面上无法观察到的特性，例如新兴的超导性和铁磁性，为新一代电子设备开辟了道路。在本项目中，将利用脉冲激光沉积技术以原子精度合成钙钛矿结构的镍酸盐多层和超晶格，并利用共振x射线线/圆二色性和反射仪、光谱椭偏仪、像差校正高分辨率透射电子显微镜（ACHRTEM）和电子能量损失光谱（EELS）进行研究。本研究的目的是详细了解原子结构与界面电子性质之间的关系，特别关注价态、轨道占用和电荷输运。然后，通过改变组成层的厚度和化学成分、衬底施加的应变和缺陷的浓度，以可控的方式操纵界面上的电子相互作用。最终，我们努力实现新的量子相，包括在先前的理论工作中预测的高温超导相。

项目成果

Revealing the atomic and electronic structure of a SrTiO3/LaNiO3/SrTiO3 heterostructure interface

揭示 SrTiO3/LaNiO3/SrTiO3 异质结构界面的原子和电子结构

• DOI: 10.1063/1.4868513
• 发表时间: 2014
• 期刊: Journal of Applied Physics
• 影响因子: 3.2
• 作者: Zaoli Zhang;S. Soltan;H. Schmid;H.-U. Habermeier;B. Keimer;U. Kaiser
• 通讯作者: U. Kaiser

Lattice distortions and octahedral rotations in epitaxially strained LaNiO3/LaAlO3 superlattices

• DOI: 10.1063/1.4881557
• 发表时间: 2014-06
• 期刊: Applied Physics Letters
• 影响因子: 4
• 作者: M. K. Kinyanjui;Y. Lu;N. Gauquelin;M. Wu;A. Frano;P. Wochner;M. Reehuis;G. Christiani;G. Logvenov;H. Habermeier;G. Botton;U. Kaiser;B. Keimer;E. Benckiser