Electronic, Magnetic, and Spectroscopic Properties of Molecular Solids

分子固体的电子、磁性和光谱性质

• 批准号: 0602859
• 负责人: James Brooks
• 金额: --
• 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: 2006
• 资助国家: 美国
• 起止时间: 2006-07-15 至 2011-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0602859&HistoricalAwards=false
• 关键词: Electronic; Magnetic; Spectroscopic; Properties; Molecular

Non-TechnicalOrganic materials present new opportunities for both scientific and technical advances due to a nearly limitless combination of carbon-based compounds. The present work explores the nature of specific "low dimensional" organic materials where the phenomena of electrical conduction and magnetism occur in either linear chains or two-dimensional planes. Under these conditions organic materials can exhibit important physical properties - superconductivity, transistor-like switching in electric or magnetic fields, and situations where electrical and magnetic processes can communicate. Powerful experimental methods including neutron scattering, magnetic resonance, high magnetic fields, and hydrostatic pressure can be used reveal the electronic and magnetic structures that control these materials. The diversity of physical systems investigated and methods employed provide an interface with a broad scientific community through association with the National High Magnetic Field Laboratory. This flexibility allows the group to host visitors, students, and teachers through scientific exchange and educational outreach programs. The project will open new vistas for organic materials studies, and will train students in advanced techniques.TechnicalThis work explores the nature of interacting electronic and magnetic structure in low dimensional organic materials. The interaction between localized spin chains and delocalized electron conducting chains produces coupled metal - insulator, magnetic, or superconducting ground states at low temperatures. Particular attention is given to materials where high magnetic fields, pressure, or electric fields produce fundamental changes in the ground state properties and dynamics of charge and spin. Powerful experimental methods including electrical transport, magnetic resonance, high magnetic fields, and hydrostatic pressure are used reveal the electronic and magnetic structure that controls the physics of these materials. Group activities, due to the diversity of both physical systems investigated and methods employed, allow an effective interface with the broader condensed matter community through association with the National High Magnetic Field Laboratory. This flexibility allows the hosting of visitors, students, and teachers through a variety of scientific exchange and educational outreach programs. High risk pilot projects in neutron scattering and photoemission will open new vistas for molecular materials studies, and will train students in these advanced techniques.

由于碳基化合物的几乎无限组合，有机材料为科学和技术进步提供了新的机会。目前的工作探索了特定的“低维”有机材料的性质，其中导电和磁性现象发生在线性链或二维平面上。在这些条件下，有机材料可以表现出重要的物理特性——超导性，在电场或磁场中类似晶体管的开关，以及电和磁过程可以通信的情况。中子散射、磁共振、强磁场和静水压力等强大的实验方法可以揭示控制这些材料的电子和磁性结构。通过与国家强磁场实验室的联系，所研究的物理系统和方法的多样性为广泛的科学界提供了一个接口。这种灵活性使该组织能够通过科学交流和教育推广项目接待游客、学生和教师。该项目将为有机材料研究开辟新的前景，并将培养学生的先进技术。本工作探讨了低维有机材料中相互作用的电子和磁性结构的本质。局域自旋链和非局域电子导电链之间的相互作用在低温下产生耦合的金属绝缘体、磁性或超导基态。特别注意的是材料在高磁场，压力，或电场产生基本的变化，在基态性质和动态电荷和自旋。强大的实验方法包括电输运、磁共振、强磁场和静水压力，揭示了控制这些材料物理特性的电子和磁性结构。小组活动，由于所研究的物理系统和所采用的方法的多样性，通过与国家高磁场实验室的联系，允许与更广泛的凝聚态物质社区建立有效的接口。这种灵活性允许通过各种科学交流和教育外展项目接待访客、学生和教师。中子散射和光电发射的高风险试点项目将为分子材料研究开辟新的前景，并将培养学生掌握这些先进技术。