Muon studies of quantum materials under extreme environments

极端环境下量子材料的μ介子研究

• 批准号: RGPIN-2022-03311
• 负责人: Sonier, Jeffrey
• 金额: $ 3.64万
• 依托单位: Simon Fraser University
• 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=762588
• 关键词: Muon; studies; quantum; materials; under

Over the next five years my research will focus on the application of the muon spin rotation/relaxation technique (µSR) to studies of novel quantum materials under extreme conditions. My goal is to understand the remarkable physical properties of topological materials, unconventional superconductors, and magnetically frustrated materials, brought about by the effects of quantum mechanics and strong electronic correlations by applying non-thermal perturbations (chemical doping, magnetic field, pressure) to tune the material towards quantum criticality. The positive muon is a sensitive local probe of internal magnetic fields on a unique microsecond time scale and will be exploited in this work to understand the effects of disorder on the exotic physical properties of quantum materials. To date I have carried out muon studies of quantum materials in the extreme environments of applied magnetic field and/or low temperature. A new emphasis of my research will be the integration of high-pressure capabilities on the GPa scale into muon studies of quantum materials at low temperatures. High pressure can be used to bring atoms in the crystal lattice of a material closer together, inducing tunable changes of the electronic structure and magnetic interactions. This objective will exploit the investment and timely completion and implementation of new high momentum and high luminosity muon beam lines at TRIUMF, Vancouver. The new research infrastructure will provide Canadian and international users with unmatched capabilities in the Western Hemisphere to study quantum systems under normal and extreme conditions. My HQP and I will gain practical experience in high pressure research using muons via collaborative experiments on quantum materials at the Paul Scherrer Institute (PSI) in Switzerland. Currently, PSI is home to the world's leading hydrostatic high-pressure muon facility for quantum materials research. Moreover, this past year a piezoelectric-driven uniaxial pressure cell was fully developed and successfully utilized in a muon experiment at PSI. The knowledge gained in this research abroad will be invaluable for establishing an analogous high-pressure research capability at TRIUMF. My team will also gain the knowledge and tools for performing theoretical calculations of muon stopping sites in materials to improve the analysis and interpretation of our experimental data. In recent years, reliable methods for calculating muon sites have been developed and applied to muon studies of materials.

在接下来的五年中，我的研究将集中于在极端条件下的新型量子材料研究中使用MUON自旋旋转/松弛技术（µSR）的应用。我的目标是了解拓扑材料，非常规的超导体和磁性沮丧的材料的显着物理特性，这是由于量子力学和强烈的电子相关性带来的，通过将非热扰动（化学掺杂，磁场，压力）施加到量子关键性方面。正元为唯一的微秒时间尺度上是对内部磁场的敏感局部探针，将在这项工作中探索，以了解障碍对量子材料的外来物理特性的影响。迄今为止，我已经在应用磁场和/或低温的极端环境中对量子材料进行了MUON研究。我的研究的新重点将是将高压能力在GPA量表上整合到低温下的量子材料研究中。高压可用于将原子在材料的晶体晶格中带入更紧密的晶格，并引起电子结构的可调变化和磁相互作用。该目标将利用温哥华Triumf的新高动量和高光度MUON光束线的投资以及及时完成和实施。新的研究基础设施将为加拿大和国际用户提供西半球无与伦比的功能，以在正常和极端条件下研究量子系统。我和我的HQP将通过瑞士Paul Scherrer Institute（PSI）的量子材料协作实验在高压研究中获得实践经验。目前，PSI是全球领先的静水压高压muon设施，用于量子材料研究。此外，在过去的一年中，一个压电驱动的单轴压力电池已完全开发并成功地用于PSI的MUON实验中。在这项国外研究中获得的知识对于在Triumf建立类似的高压研究能力将是无价的。我的团队还将获得对MUON停止材料停止站点进行理论计算的知识和工具，以改善我们实验数据的分析和解释。近年来，已经开发了用于计算若子位点的可靠方法，并将其应用于材料的若子研究。