MRI-R2: Acquisition of the Optical Cryostat for Research and Teaching

0958349 gasparovu。技术摘要：该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。理解相关电子化合物是凝聚态物理中一个特别重要的课题。磁铁矿结构跃迁（Verwey跃迁）的性质和铁镍中超导跃迁的机制是多功能氦浴光学低温恒温器所要解决的问题之一。扩展的低温能力与现有的高压能力相结合，将产生对理解所研究化合物的物理特性至关重要的新数据。北佛罗里达大学（UNF）的两个研究小组、华盛顿特区地球物理实验室的一个研究小组和佛罗里达大学（UF）的一个研究小组将从此次收购中受益。拟议的实验工作建立在PI？在相关电子系统的光谱学方面拥有丰富的专业知识。π吗?拉曼实验室配备了最先进的光谱设备。所提出的低温恒温器的临界低温能力将大大扩大PI可访问的问题范围。该项目将加强UNF的物理项目，并有助于硕士学位的发展。材料科学专业。它还将加强领先的研究机构（UF，地球物理实验室）和不断增长的主要本科大学（UNF）之间正在进行的合作。在这个研究项目中工作的学生将在一个现代化的研究环境中受益匪浅。这个项目将把高中生带入大学的氛围，将把UNF本科生带入一个主要研究机构的氛围，并将培养未来的研究生。概要：本奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。相关电子系统构成了一个非常重要的化合物家族。在这些材料中，电子受到彼此之间以及周围离子之间相互作用的同等影响。这些相互作用之间的平衡是脆弱的，很容易被打破，导致材料的突然变化。当这些材料冷却到一定的临界温度以下或置于高压下时，这些材料的S性能。例如，新发现的fe - nictides在低温和高压下显示零电阻。其他材料，如磁铁矿，在冷却时电阻会变大。了解导致这些突变的机制对材料科学非常重要，并将带来新的应用。北佛罗里达大学（UNF）的光谱学实验室拥有一流的光谱设备。获得最先进的低温恒温器将为相关电子材料的光谱研究提供关键的低温能力。可用的高压功能利用了该功能。拟议的低温恒温器将加强联合国大学的研究和教学基础设施。它将加强物理课程，并有助于硕士的发展。材料科学专业。它将加强以本科生为主的不断增长的大学（UNF）与主要研究机构（佛罗里达大学和地球物理实验室）之间正在进行的合作。本研究项目的学生将在现代研究环境中工作，并培养解决问题的重要技能。这个项目将把高中生带入大学的氛围，将把UNF本科生带入一个主要研究机构的氛围，它将在一个关键的科学和工程领域培养未来的研究生。

0958349GasparovU. of North FloridaTechnical Summary: This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). Understanding of correlated electron compounds is a particularly important subject in condensed matter physics. The nature of the structural transition (Verwey transition) in magnetite and mechanism of the superconducting transition in Fe-pnictides are among the problems that will be addressed by the proposed acquisition of the versatile helium-bath optical cryostat. Extended low temperature capability when coupled with the existing high pressure capability will yield new data critical for understanding the physics of the compounds under investigation. Two groups from the University of North Florida (UNF), a group from the Geophysical Laboratory in Washington, DC, and a group from the University of Florida (UF) will benefit from the acquisition. The proposed experimental work builds on the PI?s extensive expertise in optical spectroscopy of correlated electron systems. The PI?s Raman laboratory is equipped with state-of-the-art spectroscopic equipment. Critical low temperature capability of the proposed cryostat will substantially expand the scope of problems accessible to the PI. The project will strengthen the physics program at UNF and contribute to the development of the Master?s program in materials science. It will also reinforce the ongoing collaboration between leading research institutions (UF, Geophysical Laboratory) and a growing predominately undergraduate university (UNF). The students employed in this research program will benefit significantly by working in a modern research environment. This project will introduce high school students into the atmosphere of a university, it will introduce UNF undergraduates to the atmosphere of a major research institution, and it will generate future graduate students.Layman Summary: This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). Correlated electron systems form a very important family of compounds. In these materials electrons are equally affected by interaction between each other and interaction between surrounding ions. The balance between these interactions is fragile and can be easily broken leading to an abrupt change in the material?s properties when these materials are cooled down below certain critical temperature or put under high pressure. For instance, newly discovered Fe-pnictides display zero resistance at low temperature and high pressure. Other materials such as magnetite become more resistive when cooled down. Understanding of the mechanism leading to these abrupt changes is important for materials science and will lead to new applications. Optical spectroscopy laboratory at the University of North Florida (UNF) hosts superb spectroscopic equipment. Acquisition of the proposed state-of-the-art cryostat will provide critical low temperature capability to conduct spectroscopic research of correlated electron materials. This capability is leveraged by the available high-pressure capability. The proposed cryostat will enhance research and teaching infrastructure at UNF. It will strengthen the physics program and contribute to the development of the Master?s program in materials science. It will reinforce the ongoing collaboration between a growing predominately undergraduate university (UNF) and leading research institutions (University of Florida and Geophysical Laboratory). The students employed in this research program will work in a modern research environment and develop vital problem-solving skills. This project will introduce high school students into the atmosphere of a university, it will introduce UNF undergraduates to the atmosphere of a major research institution, it will generate future graduate students in a critical science and engineering field.