Quantum Effect and Dimensional Crossover in Spin Fluctuations

自旋涨落中的量子效应和维度交叉

基本信息

批准号：
09044052
负责人：
ENDOH Yasuo
金额：
$ 4.35万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

Recently, there has been tremendous development in the research field of the low dimensional quantum antiferromagnetism. Numbers of new experimental facts are presented, such as the quantum spin fluctuations in 1 dimensional (1D) and 2D spin systems, dimensional cross over and/or universality in the spin space and/or symmetry and so forth. These new waves owe to the rapid growth in the materials research and development which enables us the opportunity to make fine experiments by using the prototype such low D magnets. Otherwise, these important and fundamental issues are closed only in theoretical interests. In fact, a long tradition in this research field made Japan as the leading country in the low dimensional magnetism as well. Though we are at this position of the world front, we don't think it is enough to collaborate internationally or to have international opportunities to discuss with. It is our primary aim to send many young scientists to abroad who work hard and present fascinating results and also to have opportunities of collaborations with foreign scientists.First, we organized two sequential workshops at the time of the large scaled international conference on neutron scattering research. These two workshops were so successful that foreign guests participated to these workshops acknowledged very fine presentations by Japanese young participants and their active contributions. We also appreciate several new observations from collaborative experiments done at HMI and NIST which gave us neutron beams for this project, since Japanese neutron source of JRR3 has been turned off for a half year. These results include quantum spin fluctuations in 2D antiferromagnets and quantum spin glass transition in the cuprate (s=1/2) oxides.

最近，在低维量子抗铁磁性的研究领域中有了巨大的发展。提出了新的实验事实的数量，例如1维（1D）和2D自旋系统中的量子自旋波动，自旋空间中的尺寸交叉和/或通用性以及/或对称性等等。这些新的波浪归功于材料研发的快速增长，这使我们有机会通过使用如此低的D磁铁的原型进行精细的实验。否则，这些重要和基本问题仅以理论利益而结束。实际上，在这个研究领域的悠久传统使日本成为低维磁性的主要国家。尽管我们处于世界阵线的位置，但我们认为在国际上进行合作或有国际机会进行讨论是不够的。我们的主要目的是将许多年轻的科学家送到国外，他们努力工作并提出了令人着迷的结果，并与外国科学家合作的机会。首先，我们在大型国际中子散射研究会议上组织了两个连续的研讨会。这两个研讨会非常成功，以至于外国客人参加了这些研讨会，他们承认日本年轻参与者及其积极的贡献非常出色。我们还感谢HMI和NIST进行的合作实验的一些新观察结果，这为我们提供了该项目的中子光束，因为日本的JRR3的中子来源已关闭了半年。这些结果包括2D抗铁磁体中的量子自旋波动和铜酸盐（S = 1/2）氧化物中的量子自旋玻璃转变。