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

在这个项目为期两年的时间里，总共有13个领域的研究人员向波兰、捷克、德国和法国的机构或国际会议提交了执行合作工作，并提交了研究结果。总共7名外国研究人员还被邀请与当前项目进行与联合工作有关的工作。该项目的主要结果如下：（1）我们已经揭示，从Polarized Neutron Diffraction technique的CeP磁形式因子研究中，CeP的不寻常性质达到了强p-f混合效应的峰值脉冲的D28-类型晶体场异常状态下，低于D27-类型晶体场地面状态。这也被揭示了，CeAs展示了一个非常相似的磁性相位图，高于0.3 GPa。按顺序调查不寻常的磁性特性对Ce-Monopnictids的晶体晶格的影响我们已经测量了CeSb对声子的兴奋。 ... More g，并且发现了一个不寻常的兴奋分支，在尼尔温度下面的温度上出现。（2） We have revealed， by neutron inelastic scManagement ing， that the heavy electron anomalies of Yb D24 y D2As y D23 y D2a r ascribed to the spin excitations in the one-dimensional chains of Yb D13 y D1+ ions which is caused by the charge ordering。“充电订购”被确认为极化中子实验中的完美效果。The inelastic neutron scManagement ing 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 D24 y D2As y D23 y D2。The charge ordering phenomena of the similar material Sm？D24？D2Bi？D23？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 differraction experiment。（4） The heavy electron anomalies and valence fluctuation phenomena of SmイD23イエD2TeイD24イエD2 were studied by inelastic neutron and polarized neutron scManagement ing。（5） Strong magnetic anisotropy and metamagnetic properties of UNiGa and UCoAl and also the unusual properties of the skutterudite compound Rfe，D24，D2P212，D2were studied by macroscopic measurements such as the de Haas van Alphen measurement。Less（低）

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