Study of exotic phenomena in the low-carrier strongly correlated systems

低载波强相关系统中奇异现象的研究

基本信息

批准号：
09044097
负责人：
KOHGI Masahumi
金额：
$ 6.91万
依托单位：
TOKYO METROPOLITAN 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

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09044097/
关键词：
charge ordering heavy electron valence fluctuation Ce monopnictide YbィイD24ィエD2AsィイD23ィエD2 TmTe low-carrier-system neutron scattering CeP UNiGa 磁気ポーラロン 4重極秩序

项目摘要

During 2 years of this project, total 13 domestic researchers were sent to institutions or international conferences in Poland, Czech, Germany and France to perform collaboration works and also to present the research results. Total 7 foreign researchers were also invited to perform the joint works related with the present project. The main results of the project are as follows :(1) We have revealed, from the study of magnetic form factor of CeP by polarized neutron diffraction technique, that the unusual properties of CeP are due to the strong p-f mixing effect which pulls the ΓィイD28ィエD2-type crystal field excited state down below the ΓィイD27ィエD2-type crystal field ground state. It was also revealed that the CeAs exhibits quite similar magnetic phase diagram under high pressure above abou 0.3 GPa. In order to investigate the effect of the unusual magnetic properties to the crystal lattice of Ce-monopnictides we have measured the phonon excitations in CeSb by inelastic neutron scatterin … More g, and found that a branch of unusual excitations is appears at the temperatures below Neel temperature.(2) We have revealed, by neutron inelastic scattering, that the heavy electron anomalies of YbィイD24ィエD2AsィイD23ィエD2 a r ascribed to the spin excitations in the one-dimensional chains of YbィイD13ィエD1+ ions which is caused by the charge ordering. The charge ordering was confirmed to be rather perfect from the polarized neutron experiment. The inelastic neutron scattering studies under magnetic field revealed the opening of energy gap in the spin excitation spectra, which indicates the existence of a new correction term in the Heisenberg-type effective Hamiltonian of the charge ordered state of YbィイD24ィエD2AsィイD23ィエD2. The charge ordering phenomena of the similar material SmィイD24ィエD2BiィイD23ィエD2 was also observed by polarized neutron diffraction experiment.(3) The quadrupolar ordering and diminishing process of the ferromagnetism under high pressure of TmTe were studied by neutron diffraction experiment.(4) The heavy electron anomalies and valence fluctuation phenomena of SmィイD23ィエD2TeィイD24ィエD2 were studied by inelastic neutron and polarized neutron scattering.(5) Strong magnetic anisotropy and metamagnetic properties of UNiGa and UCoAl and also the unusual properties of the skutterudite compound RfeィイD24ィエD2PィイD212ィエD2 were studied by macroscopic measurements such as the de Haas van Alphen measurement. Less

在该项目的两年中，共有13名国内研究人员被送往波兰，捷克，德国和法国的机构或国际会议，以进行合作工作，并提出研究结果。总共7名外国研究人员还被邀请执行与本项目相关的联合作品。该项目的主要结果如下：（1）我们从极化中子衍射技术对CEP的磁性形式的研究中揭示了CEP的异常特性是由于强大的P-F混合效应引起的，从而使γD28D2型D2-Type晶体场兴奋的状态下降到低于γd27d2 d2-d2-d2-d2-d2-type field Sente。还发现，CEAS在ABOU 0.3 GPA上方的高压下表现出非常相似的磁相图。为了研究不寻常的磁性能对CE-Onopnictides的晶格的影响，我们已经通过无弹性中子散射来测量CESB中的声子兴奋……更多的G，并且发现异常兴奋的分支在NEEL温度下方出现在neel温度下，我们已经揭示了yb的evellovation 4 satimi nebiration yb。 D23 D2 A R归因于由电荷排序引起的YBII D13 D1+离子的一维链中的自旋兴奋。从偏光性中子实验中，确认电荷顺序是相当完美的。磁场下的非弹性中子散射研究揭示了自旋兴奋光谱中能量间隙的打开，这表明在海森贝格型有效的汉密尔顿中存在新的校正项，该电荷有效的Hamiltonian有序状态YBIY D24 D2SASY D2SASY D2SASY D23 D2。还通过极化的中子衍射实验观察到了相似材料SMIY D24 D2BIY D23 D2的电荷顺序现象。（3）在TMTE高压下，在高压下的四极阶订单和降低的四个磁极磁性的过程。 D24 D2通过非弹性中子和极化的中子散射进行研究。较少的