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U.S.-Germany Cooperative Research: Neutron Study of Magnetically Ordered Solid 3He

美德合作研究：磁有序固体3He的中子研究

基本信息

批准号：
9815530
负责人：
E. Dwight Adams
金额：
$ 2.38万
依托单位：
University of Florida
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1999
资助国家：
美国
起止时间：
1999-03-01 至 2002-02-28
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9815530&HistoricalAwards=false
关键词：
U.S.Germany Cooperative Research Neutron

项目摘要

9815530AdamsThis award supports Drs. Dwight Adams and Yasumasa Takano and one or two graduate students from the University of Florida in a collaboration with Konrad Siemensmeyer of the Hahn Meitner Institute in Berlin, Germany. The research funded by this award will focus on the study of magnetically ordered solid 3He using neutron scattering and transmission. The planned experiments will provide information crucial for a full understanding of exchange processes in a fundamental magnetic system, because at low pressure, solid 3He exhibits two different magnetic phases at temperatures less than 0.9 mK. This unusual behavior can be interpreted using what is known as a multiple-exchange model. This award will allow the investigators to study the high-field phase of solid 3He, which has never been analyzed using neutron scattering. The collaboration between researchers at Florida and Hahn Meitner is ideal for achieving the objective of the proposed work. The Florida group has extensive experience with solid 3He, especially in growing crystals and cooling them to the necessary low temperatures and the Hahn Meitner Institute has the only neutron facility in the world capable of cascade cooling to the temperatures necessary for achieving the proper crystal ordering.

9815530Adams该奖项支持博士。德怀特·亚当斯 (Dwight Adams) 和高野泰正 (Yasumasa Takano) 以及佛罗里达大学的一到两名研究生与德国柏林哈恩·迈特纳研究所的康拉德·西门子梅尔 (Konrad Siemensmeyer) 合作。该奖项资助的研究将集中于利用中子散射和传输来研究磁有序固体 3He。计划中的实验将为充分理解基本磁系统中的交换过程提供至关重要的信息，因为在低压下，固体 3He 在低于 0.9 mK 的温度下表现出两种不同的磁相。这种不寻常的行为可以使用所谓的多交换模型来解释。该奖项将使研究人员能够研究固体 3He 的高场相，而该相从未使用中子散射进行过分析。佛罗里达州研究人员和哈恩·迈特纳之间的合作非常适合实现拟议工作的目标。佛罗里达小组在固体 3He 方面拥有丰富的经验，特别是在生长晶体并将其冷却到必要的低温方面，哈恩·迈特纳研究所拥有世界上唯一能够级联冷却到实现正确晶体排序所需温度的中子设施。