权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Transitions and Complex Order at Ultralow Temperatures

超低温下的转变和复杂秩序

基本信息

批准号：
9409590
负责人：
Douglas Osheroff
金额：
$ 70万
依托单位：
Stanford University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1994
资助国家：
美国
起止时间：
1994-08-15 至 2000-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9409590&HistoricalAwards=false
关键词：
Transitions Complex Order Ultralow Temperatures

项目摘要

9409590 Osheroff Technical abstract: Helium three will be used as a model system to study various aspects of the nature of phase transitions and complex order in important classes of physical systems. Work on superfluid helium three A-B phase nucleation will probe how surface roughness increases the nucleation rate, possibly paving the way for the use of this system in quantum tunneling studies. Study of the magnetic order in thr second layer helium three films adsorbed on graphite will be continued. The emphasis of this work is to search for a possible finite temperature phase transition in low magnetic fields for this two dimensional Heisenberg system. Third sound studies will be carried out to search for a second superconducting state of sub-monolayer helium three films adsorbed on superfluid helium four. Finally, new studies of the spatial dependence of noise correlations in spin glasses will be carried out. Non-technical abstract: Helium three will be used as a model system for studying various aspects of the nature of phase transitions and complex order in important classes of physical systems. Studies of the phase transitions between two liquid helium three phases which are neutral analogs to electrical superconductors may help produce a highly effective particle detector, as well shed knowledge on a broad class of phase transitions in general. Thin helium three films which exhibit effective magnetic interactions between the atomic nuclei will allow test theoretical predictions that thin liquid helium three films on appropriate substrates may exhibit still more novel forms of order, possibly related to those seen in the oxide superconductors. ***

小行星9409590 技术摘要：氦三将被用作一个模型系统，以研究重要物理系统中相变和复杂秩序性质的各个方面。对超流氦三A-B相成核的研究将探索表面粗糙度如何增加成核率，可能为在量子隧穿研究中使用该系统铺平道路。石墨表面第二层氦三膜的磁序研究将继续进行。本工作的重点是寻找这个二维海森堡系统在低磁场中可能的有限温度相变。第三，将进行超流氦四上吸附的亚单层氦三膜的第二超导态的研究。最后，将对自旋玻璃中噪声关联的空间依赖性进行新的研究。非技术摘要：氦三将被用作模型系统，用于研究重要物理系统中相变性质和复杂顺序的各个方面。研究两个液氦三相之间的相变，这是电超导体的中性类似物，可能有助于生产一种高效的粒子探测器，以及一般情况下对广泛的相变类别的知识。氦三薄膜在原子核之间表现出有效的磁相互作用，这将允许测试理论预测，即在适当的衬底上的液态氦三薄膜可能会表现出更新颖的有序形式，可能与氧化物超导体中看到的那些有关。 ***