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; 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.

具有精确控制界面的多层在两种不同的材料之间可以产生新的物理现象和仅由任何构成而无法暴露的功能，例如半导体多层中的量子霍尔效应和简单金属多层中的“巨型磁势”。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（例如新兴的超导性和铁磁剂）上未观察到的特性，从而为新一代的电子设备开辟了道路。在这个项目中，将使用脉冲激光沉积的原子精度合成基于钙钛矿结构的镍的多层和超值晶格，并使用谐振X射线线性/圆形二色症和反射，光谱椭圆测定法，异常变形的高分辨率传输电位（ACHRTEM）和电子（ACHRTEM）和电子（ACHROSSISS）和电子（ACHROSSISS）和电子（ACHROSSISS）和电子（ACHROSSISS）和电子（Exchronic）和电子（ELECTROSSISS）进行了共鸣。这项投资的目的是对界面处原子结构与电子特性之间关系的详细理解，特别关注价状态，轨道发生和电荷运输。然后，将通过改变组成层的厚度和化学组成，底物施加的应变以及最终努力实现新的量子相，包括在先前的理论上预测的高灵性超导阶段，包括最终的量子相位，以控制界面的电子相互作用。