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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.

近年来，低维量子反铁磁性的研究取得了巨大的进展。提出了一些新的实验事实，如一维和二维自旋系统中的量子自旋涨落，自旋空间中的维度交叉和/或普适性和/或对称性等。这些新的浪潮归功于材料研究和开发的快速增长，这使我们有机会通过使用低D磁体等原型进行精细实验。否则，这些重要的和根本的问题就只停留在理论上。事实上，日本在这一领域的悠久传统使其成为低维磁学研究的领先国家。虽然我们处于世界前沿的这个位置，但我们认为，仅仅进行国际合作或有国际机会进行讨论是不够的。我们的主要目标是派遣许多年轻科学家到国外工作，并提出令人着迷的结果，并有机会与外国科学家合作。首先，我们在大型国际会议期间组织了两个连续的研讨会中子散射研究。这两个讲习班非常成功，参加讲习班的外国客人对日本青年参加者的精彩发言和他们的积极贡献表示赞赏。我们还感谢HMI和NIST合作实验中的几个新观察结果，这些实验为我们提供了用于该项目的中子束，因为日本的JRR 3中子源已经关闭了半年。这些结果包括二维反铁磁体的量子自旋涨落和铜氧化物（s=1/2）的量子自旋玻璃化转变。