Magnetically-Driven Transitions in Molecule-Based Materials

非技术摘要：该项目的总体目标是探索磁性驱动的分子基材料转变，并投资于田纳西大学不同群体的年轻人的教育。这两项倡议都促进了对物质的新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源于我们对光与物质之间基本相互作用的全面兴趣，当材料被赶离环境条件时揭示的紧急行为，以及当相竞争时出现的物质的新状态。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，它利用了国家高磁场实验室和布鲁克海文国家实验室的国家同步加速器光源II的设施。与此同时，计划中的活动支持跨学科教育，为未来在先进材料领域的学术界、政府实验室和工业界就业的不同群体的年轻研究人员提供支持。计划了范围广泛的外联和服务活动，特别是在会议和讲习班组织以及为各个国家实验室提供服务方面。技术摘要：本项目主要研究分子基材料的光谱特性，以及磁场和压力等外部刺激如何影响其功能。在前一个奖励期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体的相变以及可以在这些系统中解开的结构-性质关系上。在这一广泛的科学领域中，已经选择了几种有望显示出巨大或广泛适用效果的材料，其中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和研究这些现象的光谱技术的总体兴趣。这个综合实验项目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.