Exotic Magnetism in Geometrically Frustrated Magnets Under Extreme Conditions

极端条件下几何受挫磁体的奇异磁性

• 批准号: RGPIN-2015-06061
• 负责人: Wiebe, Christopher
• 金额: $ 3.06万
• 依托单位: University of Winnipeg
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=748154
• 关键词: Exotic; Magnetism; Geometrically; Frustrated; Magnets

Many of the technological advances of the last century, from the integrated circuit to the magnets used in magnetic resonance imaging, have been due to an understanding of the interplay between the electronic, magnetic, and lattice degrees of freedom in solids. Despite this staggering level of progress, challenges remain towards future innovations which are limited by an understanding of many-body effects and quantum mechanics. Many of the developments of the future are likely to be found in so-called quantum materials, which show exotic states of matter when exposed to extreme conditions such as high magnetic fields, low temperatures, or high applied pressures.  High temperature superconductors are prominent examples of this class of materials. The application of pressure to quantum materials as a probe of these new states of matter has been a successful route towards understanding these compounds.  Chemical pressure, for example, through the chemical substitution of larger or smaller cations into established solid state structures, has been a successful route to elucidating complicated electronic and magnetic phenomena in solids.  This has led to the exploration of entirely new electronic states of matter.  The synthesis of new materials via high pressure methods has been a rapidly growing area of research, and has helped to widely expand the number of known geometrically frustrated magnets.  Using geometrical frustration under extreme conditions as a central theme, the PI will take the following multifaceted approach to the study of quantum materials: (1) Expansion of high pressure synthesis techniques: A collaboration has been made between the University of Winnipeg and the Centre for Science at Extreme Conditions (CSEC) at the University of Edinburgh to synthesize new materials under high pressure. (2) Characterization of the thermodynamic properties of new materials: Newly synthesized materials will continue to be studied using the x-ray diffraction and low temperature capabilities at the University of Winnipeg, and also using the equipment at the National High Magnetic Field Laboratory (Tallahassee, Florida), and the University of Edinburgh (CSEC). (3) Structural and magnetic studies of new materials using neutron scattering, x-ray scattering and muon spin relaxation: The current research program of the PI using probes such as neutron scattering, x-ray scattering, and muon spin relaxation will be expanded to incorporate high pressure probes. (4) Expansion of crystal growth techniques: High pressure crystal growth techniques will be explored using the high pressure image furnaces at the Oak Ridge National Laboratory.  These four areas of growth will be complemented by an educational program that involves not only undergraduate students at the University of Winnipeg, but also graduate students through the PIs joint appointment at the University of Manitoba and McMaster University.

上个世纪的许多技术进步，从集成电路到磁共振成像中使用的磁铁，都是由于了解固体中电子，磁性和晶格自由度之间的相互作用所致。尽管取得了惊人的进步，但对未来创新的挑战仍然存在，这些创新受到对多体效应和量子力学的理解的限制。未来的许多发展可能会在所谓的量子材料中找到，当暴露于高磁场，低温或高施加压力等极端条件时，这些量子材料表现出异国情调状态。高温超导体是此类材料的重要例子。将量子材料作为对这些新物质的探测的施加压力已经成功地了解了这些化合物。例如，化学压力通过化学替代较大或较小的阳离子为已建立的固态结构，已经成功地阐明了固体中复杂的电子和磁现象的途径。这导致探索了全新的物质电子状态。通过高压法的合成新材料已成为一个快速增长的研究领域，并有助于广泛扩大已知的几何沮丧磁体的数量。在极端条件下，使用几何挫败感作为中心主题，PI将采用以下多方面的方法来研究量子材料的研究：（1）高压合成技术的扩展：温尼伯大学与爱丁堡大学的极端条件下（CSEC）之间的科学中心（CSEC）进行了协作，以使其在综合新材料下进行高压。 （2）新材料的热力学特性的表征：新合成的材料（3）使用中子散射，X射线散射和MUON自旋松弛的新材料的结构和磁研究：使用中子散射，X射线散射以及Muon Spin Sleasation等问题的当前PI研究计划将扩大到高压问题。 （4）晶体生长技术的扩展：将使用橡树岭国家实验室的高压图像炉进行高压晶体生长技术。这四个增长领域将由一项教育计划完成，该计划不仅涉及温尼伯大学的本科生，还涉及通过曼尼托巴大学和麦克马斯特大学的PIS联合任命而研究生。