Physics of Quasicrystals and Their Approximants

准晶体及其近似物理

• 批准号: RGPIN-2018-04482
• 负责人: Stadnik, Zbigniew
• 金额: $ 2.11万
• 依托单位: University of Ottawa
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=665781
• 关键词: Physics; Quasicrystals; Their; Approximants

Advances in condensed matter physics often require the discovery and development of new materials that extend or challenge the current understanding. This proposal addresses both the synthesis of new materials and the investigation of their physical properties. The project is focused on0 one particular class of materials that is of current interest, namely quasicrystals. Discovered in 1984, quasicrystals are a new form of solid that differs from the two other types, crystalline and amorphous, by possessing a new kind of long-range order, called quasiperiodicity, and non-crystallographic orientational order associated with classically forbidden fivefold, eightfold, tenfold, and twelvefold symmetry axes. One of the central problems in condensed-matter physics is whether quasiperiodicity leads to novel physical properties which are significantly different from those of crystalline and amorphous materials. This proposal will attempt to discover such novel properties by answering several outstanding questions concerning the magnetic and electronic structure properties of quasicrystals. These questions will be addressed via the synthesis of many families of new quasicrystals and their approximants (the crystalline materials with a local atomic structure similar to that in quasicrystals) and the investigation of their magnetic and electronic structure properties with an array of modern experimental techniques. The anticipated outcome of this proposal will be a complete understanding of the fundamental physical properties of these new materials. The realization of this project will not only benefit the condensed-matter research field but may lead to finding quasiperiodicity-induced applications of quasicrystals in materials industry. Also, about two dozens of highly qualified personnel will acquire a range of practical synthesis and measurement skills that will help them to find employment in the high-technology sector of industry or academia.

凝聚态物理学的进步往往需要发现和发展新材料，以扩展或挑战目前的理解。这项建议既涉及新材料的合成，也涉及对其物理性质的研究。该项目的重点是当前感兴趣的一类特殊材料，即准晶。准晶是1984年发现的一种新的固体形式，它不同于其他两种类型的晶体和非晶态，它具有一种新的长程有序，称为准周期性，以及与经典禁止的五重、八重、十重和十二重对称轴相关的非晶体取向有序。凝聚态物理的核心问题之一是准周期性是否会产生与晶体和非晶态材料显著不同的新的物理性质。这项提议将试图通过回答有关准晶的磁性和电子结构性质的几个悬而未决的问题来发现这种新的性质。这些问题将通过合成许多新的准晶及其近似物(具有与准晶中类似的局域原子结构的晶体材料)并利用一系列现代实验技术来研究它们的磁性和电子结构来解决。这项提议的预期结果将是对这些新材料的基本物理性质有一个全面的了解。该项目的实现不仅有利于凝聚态研究领域的发展，而且有望在材料工业中发现准周期诱导的准晶应用。此外，约20名高素质人员将获得一系列实用的合成和测量技能，这些技能将帮助他们在工业或学术界的高科技部门找到工作。