Magnetic Ordering in Solid 3He

固体 3He 中的磁排序

• 批准号: 9800712
• 负责人: E. Dwight Adams
• 金额: --
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-08-15 至 2001-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9800712&HistoricalAwards=false
• 关键词: Magnetic; Ordering; Solid; 3He

9800712 Adams This is an experimental project in low temperature physics. The research will employ the facilities at the Microkelvin Laboratory at the University of Florida, and the National High Magnetic Field Laboratory at the University of Florida and Florida State University. The research focuses on magnetic and thermodynamic properties of solid Helium-3, an isotope of Helium. Solid Helium- 3 exhibits novel and complex magnetic phases as a function of magnetic field and temperature. The transition from the high- field phase to the paramagnetic phase of anti-ferromagnetically ordered body-centered-cubic Helium-3 will be investigated at magnetic fields and temperatures previously unavailable. A second investigation will use the technique of cascade magnetization to study ferromagnetic ordering of the hexagonal-close-packed phase at temperatures in the microKelvin range. A third project will study the magnetism of droplets of frozen Helium-3 in a matrix of Helium-4, the other and more common isotope of Helium. Here surface effects influence the magnetic properties of the Helium-3 in ways that are not understood. The research provides excellent training of graduate students and post-doctoral associates in cutting-edge research in the properties of matter at extremes of (low) temperature and ultra-high magnetic fields. This background prepares the students for careers in a range of employment opportunities, from basic research to technological areas. %%% This is an experimental project in low temperature physics. The research will employ the facilities at the Microkelvin Laboratory at the University of Florida, and the National High Magnetic Field Laboratory at the University of Florida and Florida State University. The research focuses on the magnetic and thermodynamic properties of magnetically ordered solid Helium-3, an isotope of Helium. Solid Helium-3 is a model magnetic mat erial that exhibits complex magnetic phases as a function of magnetic field and temperature. It is novel in that these phases are found only at ultra-low temperatures and at ultra-high magnetic fields. The research therefore demands unique instrumentation available only at a few laboratories in the world, including the University of Florida and Florida State University. The experiments will investigate the magnetic properties of Helium-3 at temperatures within a few millionths of absolute zero, and at magnetic fields that are a billion times the strength of the earth's magnetic field. The results are of fundamental interest but are relevant to all fields of magnetism where magnetic properties vary with temperature or magnetic field. The research provides excellent training of graduate students and post-doctoral associates in cutting-edge research in the properties of matter at extremes of (low) temperature and ultra-high magnetic fields. This background prepares the students for careers in a range of employment opportunities, from basic research to technological areas. ***

9800712 Adams 这是一个低温物理实验项目。 该研究将利用佛罗里达大学微开尔文实验室、佛罗里达大学和佛罗里达州立大学国家高磁场实验室的设施。 该研究的重点是固态 Helium-3（氦的同位素）的磁性和热力学性质。固体 Helium-3 表现出新颖且复杂的磁相，作为磁场和温度的函数。反铁磁有序体心立方 Helium-3 从高场相到顺磁相的转变将在以前无法获得的磁场和温度下进行研究。第二项研究将使用级联磁化技术来研究微开尔文温度范围内六方密堆积相的铁磁有序性。第三个项目将研究 Helium-4（另一种更常见的氦同位素）基质中冷冻 Helium-3 液滴的磁性。 这里，表面效应以未知的方式影响 Helium-3 的磁性。该研究为研究生和博士后提供了有关极端（低温）和超高磁场下物质特性的前沿研究的优秀培训。这种背景为学生在从基础研究到技术领域的一系列就业机会中的职业做好准备。 %%%这是一个低温物理的实验项目。 该研究将利用佛罗里达大学微开尔文实验室、佛罗里达大学和佛罗里达州立大学国家高磁场实验室的设施。 该研究的重点是磁有序固体 Helium-3（氦的同位素）的磁性和热力学性质。固体 Helium-3 是一种磁性材料模型，随着磁场和温度的变化呈现出复杂的磁相。其新颖之处在于，这些相仅在超低温和超高磁场下才被发现。 因此，这项研究需要世界上只有少数实验室才能提供的独特仪器，包括佛罗里达大学和佛罗里达州立大学。这些实验将研究 Helium-3 在绝对零的百万分之几的温度和地球磁场强度十亿倍的磁场下的磁性。 结果具有根本意义，但与磁特性随温度或磁场变化的所有磁领域相关。该研究为研究生和博士后提供了有关极端（低温）和超高磁场下物质特性的前沿研究的优秀培训。这种背景为学生在从基础研究到技术领域的一系列就业机会中的职业做好准备。 ***