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

Joint Research on Quantum Effects in Magnetic Systems

磁系统量子效应联合研究

基本信息

批准号：
05044070
负责人：
KATSUMATA Koichi
金额：
$ 6.4万
依托单位：
The Institute of Physical and Chemical Research
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05044070/
关键词：
Quantum Effects in Magnetic Systems One Dimensional Magnet Haldane Gap E.S.R., X Ray Magnetic Scattering Neutron Scattering X線磁気散乱中性子回折

项目摘要

It is the aim of the present project to clarify the quantum phenomena in one-dimensional magnetic systems and related materials in collaboration with French and German scientists. Some of the important findings obtained from this project are summarized below :(1)In collaboration with the scientists at the Brookhaven National Laboratory in the United States, the magnetic excitation spectra in the S=1 one-dimensional antiferromagnet NINO and NINO with Cu impurities have been measured. The Haldna gap energy in NINO does not change with Cu doping, whereas the correlation length becomes shorter with Cu impurity.(2)In collaboration with the scientists at the Hahn-Meitner Institute in Germany, the magnetic properties of an S=2 quasi-one dimensional antiferromagnet CrCl_2 have been studied. A new phase transition has been observed below the Neel temperature. The magnetic excitation spectra have been measured and two gap energies are observed.(3)Samples of an S=1/2 quasi-one dimensional antiferromagnet and related compounds have been synthesized and their magnetic properties have been measured. A large reduction of the magnetic moment due to quantum fluctuation has been observed. In collaboration with the scientists at the Brookhaven National Laboratory in the United States, the magnetic excitation spectra in these samples habe been measured.(4)In collaboration with the scientist at the University of Paris in France, electron spin resonance measurements have been done on the S=5/2 quasi-one dimensional antiferromagnet TMMC.A large shift of the resonance point from the classical value has been observed.

本项目的目的是与法国和德国科学家合作，澄清一维磁系统和相关材料中的量子现象。（1）与美国布鲁克海文国家实验室的科学家合作，测量了S=1一维反铁磁体NINO和含Cu杂质的NINO的磁激发谱。NINO的Haldna能隙不随Cu掺杂而改变，但相关长度随Cu掺杂而变短。(2)In与德国Hahn-Meitner研究所的科学家合作，研究了S=2的准一维反铁磁体CrCl_2的磁性。在低于Neel温度时观察到一个新的相变。测量了磁激发谱，观察到两个带隙能。（3）合成了S=1/2准一维反铁磁体及相关化合物样品，并测量了它们的磁性。已经观察到由于量子涨落引起的磁矩的大的减少。与美国布鲁克海文国家实验室的科学家合作，测量了这些样品的磁激发光谱。(4)In与法国巴黎大学的科学家合作，对S=5/2准一维反铁磁体TMMC进行了电子自旋共振测量，观察到共振点从经典值有很大的偏移.