Magnetic Resonance Investigations of Symmetries, Interactions and their Consequences in Electronic Matter

电子物质中对称性、相互作用及其后果的磁共振研究

• 批准号: 0804408
• 负责人: Stephen Hill
• 金额: $ 36.5万
• 依托单位: Florida State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-11-01 至 2012-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0804408&HistoricalAwards=false
• 关键词: Magnetic; Resonance; Investigations; Symmetries; Interactions

Non-technical abstract:This project focuses on multi-functional synthetic materials composed of molecular units that can be expected to play a key role in the future development of molecular electronics. Efforts will be directed towards gaining new understanding of organic superconductors and molecular nanomagnets. A unifying theme involves the use of magnetic resonance to obtain detailed structural information for these molecule-based materials, with a particular focus on the importance of molecular and/or crystal symmetries and their consequences in terms of the resulting material properties. The proposed research relies heavily on new experimental methods developed recently by the PI, permitting studies in magnetic fields of up to 45 tesla at the National High Magnetic Field Laboratory (NHMFL). Combining these capabilities with high pressures will also be explored. This is an interdisciplinary research field that is ideally suited to a university/national lab setting, and especially suitable for student research experiences. Work will be performed predominantly by graduate and undergraduate students at Florida State University and at the NHMFL. As in the past, the PI will also train young scientist through several local programs which support summer research experiences for local high school students and undergraduates from underrepresented groups.Technical abstract:This project will explore the consequences of electronic interactions in anisotropic crystals, with particular focus on the role of symmetry in stabilizing electronic and magnetic order. Magnetic resonance spectroscopy is perfectly suited to this problem: studies as a function of field orientation will probe the spatial symmetry of the underlying Hamiltonian, and dipole selection rules will provide information about additional symmetries. Specific problems include: (i) the origin of ?missing? Drude weight in organic superconductors; (ii) the correspondence between electronic structure and superconducting symmetry in organics and oxides; (iii) the search for a spin-supersolid; and (iv) the relevance of antisymmetric exchange in molecular nanomagnets and ordered spin systems. The proposed research relies on spectroscopic techniques developed recently by the PI, permitting studies in fields up to 45 tesla at the National High Magnetic Field Laboratory (NHMFL). Combining these capabilities with high pressures will also be explored. Work will be performed by graduate and undergraduate students at Florida State University and the NHMFL. As in the past, the PI will also train young scientist through several local programs which support summer research experiences for local high school students and undergraduates from underrepresented groups.

非技术摘要：该项目重点研究由分子单元组成的多功能合成材料，这些材料有望在未来分子电子学的发展中发挥关键作用。将努力获得对有机超导体和分子纳米磁体的新理解。一个统一的主题涉及使用磁共振来获得这些基于分子的材料的详细结构信息，特别注重分子和/或晶体对称性的重要性及其对所产生的材料性能的影响。拟议的研究在很大程度上依赖于PI最近开发的新实验方法，允许在国家高磁场实验室(NHMFL)进行高达45特斯拉的磁场研究。还将探索将这些能力与高压相结合。这是一个跨学科的研究领域，非常适合大学/国家实验室的设置，特别适合学生的研究经验。工作将主要由佛罗里达州立大学和NHMFL的研究生和本科生完成。像过去一样，PI还将通过几个当地项目培养年轻科学家，这些项目支持当地高中生和来自代表不足群体的本科生的暑期研究经验。技术摘要：这个项目将探索各向异性晶体中电子相互作用的后果，特别是对称性在稳定电子和磁性秩序中的作用。磁共振光谱学非常适合于这个问题：作为场方向函数的研究将探索潜在哈密顿量的空间对称性，偶极选择规则将提供关于额外对称性的信息。具体问题包括：(I)失踪的来源？(2)有机化合物和氧化物中电子结构与超导对称性之间的对应关系；(3)自旋超固体的寻找；(4)分子纳米磁体和有序自旋系统中反对称交换的相关性。这项拟议的研究依赖于PI最近开发的光谱技术，允许在国家强磁场实验室(NHMFL)进行高达45特斯拉的场研究。还将探索将这些能力与高压相结合。这项工作将由佛罗里达州立大学和NHMFL的研究生和本科生完成。像过去一样，PI还将通过几个地方项目培养年轻科学家，这些项目支持当地高中生和来自代表不足群体的本科生的暑期研究体验。