Strongly correlated electron physics in novel materials

新型材料中的强相关电子物理

• 批准号: EP/G007357/1
• 负责人: Robin Perry
• 金额: $ 36.51万
• 依托单位: University of Edinburgh
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2009
• 资助国家: 英国
• 起止时间: 2009 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FG007357%2F1
• 关键词: Strongly; correlated; electron; physics; novel

The basic physical theories of matter have been known for many decades but increasingly scientists are uncovering materials that challenge some of these accepted tenets, and within these new classes of compounds there is considerable potential for technological innovation. However, before we can run we must walk and a full understanding of the physics of these novel properties is required so the materials can be bent to our will. Notably, recent research has pointed to glaring errors in our standard theory of metals, the underlying cause of which are strong interactions between the constituent electrons. Traditionally, electron-electron interactions have been treated as negligible within metals and generally ignored. However, over the last few decades novel materials have been uncovered in which electron interaction energies are comparable to the electronic kinetic (or translational) energies; the electrons are said to be 'strongly correlated'. As well as appearing to defy the standard theories of metals these systems quite often display striking magnetic phenomena. A particularly exciting aspect is that these phenomena offer us excellent opportunities for technological development. Indeed, several new correlated electron systems discovered in the last few decades have been adapted for solid state devices. Examples include substations for mobile phone networks that incorporate the high-Tc cuprate superconductors and new magnetic read head technologies that exploit the giant magnetoresistance properties of the Fe/Cr/Fe trilayers. This scientific research proposal is centred on producing and studying exotic materials with the goal of discovering new correlated electron quantum states. It focuses two unexplored families of materials, the niobates and iridates that we believe should provide new and interesting avenues of research in the correlated electron field. The research is fundamental in nature but benefits from a very clear connection to electronic device development since new electronic quantum phenomena offer excellent opportunities for applied science.On a broader view, the physics of materials represents a new frontier for scientific pioneering. Physicists are analogous to the intrepid explorers who, in their thirst for discovery and adventure, set out to explore and map the world. In their course of their adventures, those pioneers discovered some startling facts about our planet that challenged many long-held conceptual viewpoints, for example the world was not flat, as had been previously supposed, but spherical. In a similar manner (although with considerably less danger!), we hope to uncover exciting new phenomena that challenge our current perceptions of nature and enhance our understanding of the universe that we live in. It is this thrill of discovery that drives people in materials physics to explore and quantify strange new compounds that will hopefully one day benefit all.

物质的基本理论已经知道了数十年，但是越来越多的科学家正在揭示挑战其中一些所接受的宗旨的材料，在这些新的化合物中，技术创新具有很大的潜力。但是，在我们跑步之前，我们必须走路，并且需要对这些新型特性的物理学有充分的了解，以便材料可以屈服于我们的意志。值得注意的是，最近的研究表明，我们的标准金属理论明显误差，其基本原因是组成电子之间的强烈相互作用。传统上，电子 - 电子相互作用已被视为在金属中可以忽略不计，并且通常被忽略。然而，在过去的几十年中，新型材料被发现，其中电子相互作用能与电子动力学（或翻译）能量相当。据说这些电子“密切相关”。除了似乎无视金属的标准理论外，这些系统经常显示出惊人的磁现象。一个特别令人兴奋的方面是，这些现象为我们提供了技术发展的绝佳机会。实际上，在过去几十年中发现的几种新的相关电子系统已针对固态设备进行了调整。示例包括包含高-TC Cuprate超导体的移动电话网络的变电站和新的磁性读取头技术，这些技术利用了Fe/Cr/Fe Trilayers的巨型磁场势力。这项科学研究建议集中在生产和研究外来材料的目的是发现新的相关电子量子状态。它重点是两个未开发的材料家族，即尼古丁和虹膜元素，我们认为应该在相关电子领域提供新的有趣的研究途径。这项研究本质上是基本的，但由于与电子设备开发的非常明确的联系而受益，因为新的电子量子现象为应用科学提供了绝佳的机会。在更广阔的视野中，材料的物理学代表了科学开创性的新领域。物理学家类似于勇敢的探险家，他们在发现和冒险的渴望中着手探索和绘制世界。在冒险的过程中，那些先驱发现了一些关于我们星球的惊人事实，这些事实挑战了许多长期以来的概念观点，例如，世界并不像以前的那样平坦，但是球形。我们希望以类似的方式（尽管危险较小！），我们希望发现令人兴奋的新现象，这些新现象挑战了我们当前对自然的看法，并增强了我们对我们所生活的宇宙的理解。正是这种发现的快感驱动人们在材料物理学中探索和量化奇怪的新化合物，希望有一天会受益。

项目成果

Universality of pseudogap and emergent order in lightly doped Mott insulators

• DOI: 10.1038/nphys3894
• 发表时间: 2017-01-01
• 期刊: NATURE PHYSICS
• 影响因子: 19.6
• 作者: Battisti, I.;Bastiaans, K. M.;Allan, M. P.
• 通讯作者: Allan, M. P.

Hall coefficient anomaly in the low-temperature high-field phase of Sr 3 Ru 2 O 7

Sr 3 Ru 2 O 7 低温高场相霍尔系数异常

• DOI: 10.1103/physrevb.84.205112
• 发表时间: 2011
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: Borzi R