Magnetically-Driven Transitions in Molecule-Based Materials

非技术摘要：该项目的总体目标是探索基于分子的材料中的磁驱动转变，并投资于田纳西大学多元化年轻人群体的教育。这两项倡议都促进了对物质新的电子和磁性状态的基本理解，同时为重要的社会价值和成果做出了贡献。这项研究的科学影响来自于我们对光与物质之间基本相互作用的全面兴趣，当材料被驱离环境条件时所揭示的新兴行为，以及当相竞争时出现的新物质状态。这项工作建立在低温，高磁场和高压光谱学的先前经验的基础上，并利用了布鲁克海文国家实验室的国家高磁场实验室和国家同步加速器光源II的设施。与此同时，计划中的活动支持不同群体的年轻研究人员的跨学科教育，以便未来在先进材料领域的学术界，政府实验室和工业界就业。计划开展一系列广泛的外联和服务活动，特别是在会议和讲习班的组织以及向各国实验室提供服务方面。技术摘要：该项目的重点是基于分子的材料的光谱特性，以及外部刺激如磁场和压力如何影响功能。在前一个奖项期间的关键进展的基础上，目前的努力集中在模型量子磁体和混合多铁性的相变以及可以在这些系统中解开的结构-性质关系。在这个广泛的科学领域内，已经选择了几种材料，这些材料预计将显示出巨大或广泛适用的影响，并且光谱响应的分析可以揭示电荷，结构和磁性之间耦合的微观方面。将这些努力结合在一起的是对极端条件下材料行为的总体兴趣以及研究这些现象的光谱技术。这项综合实验计划的发现将促进理论理解和新材料的设计。

Non-technical abstract:The overall goals of this project are to explore magnetically-driven transitions in molecule-based materials and to invest in the education of a diverse group of young people at the University of Tennessee. Both initiatives advance the fundamental understanding of new electronic and magnetic states of matter while contributing to important societal values and outcomes. The scientific impacts of this research derive from our across-the-board interest in the fundamental interactions between light and matter, the emergent behaviors that are unveiled when materials are driven away from ambient conditions, and the new states of matter that emerge when phases compete. This work builds on prior experience with low temperature, high magnetic field, and high pressure spectroscopy, and it leverages the facilities at the National High Magnetic Field Laboratory and the National Synchrotron Light Source II at Brookhaven National Laboratory. At the same time, planned activities support the interdisciplinary education of a diverse group of young researchers for future employment in academics, government laboratories, and industry in the area of advanced materials. A broad range of outreach and service activities are planned, especially in the area of conference and workshop organization and service to various national laboratories. Technical abstract:This project focuses on the spectroscopic properties of molecule-based materials and how external stimuli like magnetic field and pressure impact functionality. Building on key advances of the previous award period, current efforts concentrate on phase transitions in model quantum magnets and hybrid multiferroics and the structure-property relationships that can be unraveled in these systems. Within this broad scientific area, several materials have been selected that are expected to show large or widely applicable effects and where the analysis of the spectroscopic response can reveal the microscopic aspects of coupling between charge, structure, and magnetism. What brings these efforts together is an overarching interest in the behavior of materials under extreme conditions and the spectroscopic techniques with which these phenomena are investigated. Findings from this comprehensive experimental program will advance both theoretical understanding and the design of new materials.