A New Paradigm for Quantum Materials Discovery: S = 1/2 Kagome Magnets in the Two-Dimensional Limit

量子材料发现的新范式：二维极限下的 S = 1/2 Kagome 磁体

• 批准号: EP/T02271X/1
• 负责人: Lucy Clark
• 金额: $ 43.34万
• 依托单位: University of Birmingham
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2020
• 资助国家: 英国
• 起止时间: 2020 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FT02271X%2F1
• 关键词: New; Paradigm; Quantum; Materials; Discovery

Materials research over the past century has had a phenomenal impact on modern-day life. Without materials discovery and the development of a fundamental understanding of the properties of solids, we would lack the many advanced technologies we have come to rely on today. A crucial challenge to enabling the technologies of tomorrow is to discover new classes of materials with never-before-seen properties that push the limits of our understanding of the physical world and that we can harness for societal and economic benefit. Two related examples of emerging classes of materials that can display unprecedented behaviour are quantum materials and two-dimensional materials. Quantum materials are those whose properties are uniquely determined by quantum mechanical effects that remain evident at high temperatures and long length scales. The exotic properties of quantum materials are essential from a technological perspective as they will underpin the development of next-generation quantum technologies, such as quantum computing, over the 21st Century. Equally, the recent discoveries of two-dimensional materials demonstrate the extraordinary physical properties that can arise in matter when downscaled to atomically thin layers from the three-dimensional bulk. A well-known example is graphene, a two-dimensional form of carbon, which displays remarkable conductivity, flexibility and strength, holding great promise for novel device applications in the future. This proposal aims to develop a new class of two-dimensional quantum materials that will unite concepts at the frontiers of materials chemistry and condensed matter physics. In particular, this study centres on a novel chemical paradigm for the quantum kagomé magnet, a cornerstone of current quantum materials research. In theory, the quantum kagomé magnet is a two-dimensional array of corner-sharing triangles of S = 1/2 magnetic moments that arise, for example, from the unpaired electrons of a transition metal ion such as copper. These ingredients conspire to give rise to an exciting assortment of quantum mechanical effects pertinent to future advanced technologies. As such, the realisation of different examples of quantum kagomé magnets is a crucial materials discovery challenge in order to explore and exploit their enigmatic physical properties experimentally. Since a revolutionary materials discovery in 2005, the research effort in this field has focussed heavily on the synthesis of inorganic materials which contain quasi-two-dimensional approximations of a quantum kagomé network. While this approach has unveiled some fascinating materials properties, it is ultimately limited by a fundamental need to vastly improve our control of materials design at the atomic level to truly understand the experimental signatures intrinsic to the quantum kagomé magnet. To address this need, this research will first explore our ability to control the assembly and ensuing properties of a family of magnetic hybrid framework materials known as metal-organic frameworks; materials composed of inorganic copper-based magnetic kagomé layers connected via carbon-based organic molecules. The research will then go on to investigate a variety of promising routes to delaminate these materials and produce unique realisations of the quantum kagomé magnet in the two-dimensional limit. In the short-term, this project will deliver new understanding in quantum materials design and synthesis and a step-change in the available chemical realisations of quantum kagomé magnets. In the longer-term, the chemical nature of the targeted materials coupled with their strong propensity to manifest unconventional physics may have far-reaching implications in diverse fields, from condensed matter theory to magnetic property measurement and device fabrication.

过去一个世纪的材料研究对现代生活产生了巨大的影响，如果没有材料的发现和对固体特性的基本了解，我们将缺乏今天所依赖的许多先进技术。实现未来技术的挑战是发现具有前所未见特性的新型材料，这些材料突破了我们对物理世界理解的极限，并且我们可以利用它们来实现社会和经济效益。新兴材料类别的两个相关例子。能够表现出前所未有的行为的材料是量子材料和二维材料量子材料是那些其特性由量子力学效应独特决定的材料，量子材料的奇特特性从技术角度来看是至关重要的，因为它们将支撑下一代量子技术的发展。同样，在 21 世纪，二维材料的最新发现证明了物质从三维体缩小到原子薄层时可能出现的非凡物理特性，一个众所周知的例子是。石墨烯，一种二维形式的碳具有卓越的导电性、柔韧性和强度，为未来的新型器件应用带来了巨大希望。该提案旨在开发一种新型二维量子材料，将材料前沿的概念结合起来。特别是，这项研究集中在量子戈梅磁体的新型化学范式上，这是当前量子材料研究的基石。理论上，量子戈戈梅磁体是由角共享三角形组成的二维阵列。 S=例如，由铜等过渡金属离子的不成对电子产生的 1/2 磁矩共同产生了与未来先进技术相关的一系列令人兴奋的量子力学效应。量子 Kagomé 磁体的不同例子是材料发现的一个关键挑战，以便通过实验探索和利用其神秘的物理特性，自 2005 年发现革命性材料以来，该领域的研究工作主要集中在合成材料上。包含量子 Kagomé 网络的准二维近似的无机材料虽然这种方法揭示了一些令人着迷的材料特性，但它最终受到我们对原子水平上材料设计的控制以真正理解的基本需求的限制。为了满足这一需求，本研究将首先探索我们控制一系列磁性混合框架材料（称为金属有机框架材料）的组装和后续特性的能力；然后，该研究将继续研究通过碳基有机分子连接的无机铜基磁性 Kagomé 层，并在二维极限内产生独特的量子 Kagomé 磁体。短期内，该项目将带来对量子材料设计和合成的新理解，并改变量子戈戈梅磁体的可用化学实现；从长远来看，目标化学耦合材料的性质及其强大的性能。表现出非常规物理学的倾向可能在从凝聚态理论到磁性能测量和设备制造的各个领域产生深远的影响。

项目成果

Uncovering the Kagome Ferromagnet within a Family of Metal-Organic Frameworks.

• DOI: 10.1021/acs.chemmater.2c00289
• 发表时间: 2022-06-28
• 期刊: CHEMISTRY OF MATERIALS
• 影响因子: 8.6
• 作者: Ivko, Samuel A.;Tustain, Katherine;Dolling, Tristan;Abdeldaim, Aly;Mustonen, Otto H. J.;Manuel, Pascal;Wang, Chennan;Luetkens, Hubertus;Clark, Lucy
• 通讯作者: Clark, Lucy