Phisics of Strongly Correlated Conducting Elevtrons

“Theory Group of Research Project”，“Strongly Correlated Conducting Electrons”，“使用Experiment Group关闭协作组”。4年后的主要结果是按顺序排列的。（1）在许多f-电子超导体中，UPt 3具有多态超导体相位在超导体的自然中显然是不常规的。在这些材料中，Kitaoka等。（大大学）Sakakibara （北海道大学）我们已经收集了核磁共振和磁测量的详细情况。Machida （Okayama大学）他提出了一个三重超行为的场景，以解释基于物理学理论的那些实验。这是下一个重要的问题，要提出一个微观起源的超导电性。“这是一种常见的智慧，它在金属中的磁性影响通常会在低温度下转变为费米液体。”However， Sakakibara等人。al. found that ThRu_D22_D22_D22_D2 containing dilute U shows non-Fermi liquid be\ior。这个问题是由3个理论研究的。 ... More Shiba （Tokyo Inst.Tech.），Sakai （东北大学）and Miyake （Osaka Univ.）。结果显示，当水晶场地面状态是非克雷默双重和良好的分离时，两个通道-康多非费米液体是可能的，当它被费米液体取代时，兴奋状态变得低。Sakai and his coworkers determined the temperature dependence of various physical quantities by using numerical renormalization group method。（3）由于Freedom的轨道程度，某些f电子系统的有序阶段是复杂的。在添加到常规的磁性排序中，一个可以有一个与四极时刻相关的排序相位。CeB-D26-D2a typical example of this sort。在磁性领域中的有序相位的自然特征，特别是很有争议的事情。Shiba和Sakai研究了这个问题，并展示了在CeB-D26-D2的现场诱导的八度是可伸缩的，也是重要的，以解释核磁共振转换，这对一个很长的时间来说已经是一个神秘的。在这个连接上Kuramoto （东北大学）提出了一个关于闪光四重奏的理论。（4） Miyake提出了一个Kondo半导体理论，以计算混合矩阵元素的k-依赖性。这很好地说明了Takabatake的CeNiSn的实验结果（广岛大学）在实验中学习。（5）Hasegawa的Band结构计算已经承载了许多稀有地球化合物（Niigata Univ.）和Harima （Osaka Univ.）。他们通过Onuki （Osaka Univ.）与de Hans-van Alphen experiments（Osaka Univ.）进行比较。Hasegawa等人。al. have develped a theory of relativistic current and spin density functional.这就是为什么它成功地应用于活性化合物的原因。Less（低）

The Theory Group of Research Project "Physics of Strongly Correlated Conducting Electrons" has carried out research in close collaboration with the Experiment Group. The main results during the 4 years are as follows.(1) Among many f-electron superconductors UPt3 having plural superconducting phases is clearly unconventional in the nature of superconductivity. On this material Kitaoka et. al. (Osaka Univ.) and Sakakibara (Hokkaido Univ.) have carried out detailed NMR and magnetic measurements. Machida (Okayama Univ.) has proposed a scenario of triplet superconductivity to explain those experiments based on a phenomenological theory. It is the next important problem to give a microscopic origin of the superconductivity.(2) It is a common wisdom that magnetic impurities in metals usually turn to Fermi liquid at low temperatures. However, Sakakibara et. al. found that ThRuィイD22ィエD2SiィイD22ィエD2 containing dilute U shows non-Fermi liquid behavior. This problem was theoretically studied by 3 … More groups, Shiba (Tokyo Inst. Tech.), Sakai (Tohoku Univ.) and Miyake (Osaka Univ.). The results show that when the crystal field ground state is non-Kramers doublet and well separated from excited states, two-channel-Kondo non-Fermi liquid is possible, while it is taken over by Fermi liquid when the excited states become low. Sakai and his coworkers determined the temperature dependence of various physical quantities by using numerical renormalization group method.(3) Because of orbital degrees of freedom the ordered phase of some f-electron systems are complicated. In addition to ordinary magnetic orderings one can have an ordered phase related to quadrupole moments. CeBィイD26ィエD2 a typical example of this sort. The nature of the ordered phase in magnetic fields in particular had been a matter of controversy. Shiba and Sakai studied this problem and showed that in CeBィイD26ィエD2 the field-induced octupoles are sizable and important to explain the NMR shifts, which had been a mystery for a long period. In this connection Kuramoto (Tohoku Univ.) presented a theory of fluctuating quadrupoles.(4) Miyake presented a theory of Kondo semiconductors, taking into account the k-dependence of mixing matrix elements. It explains well experimental results of CeNiSn, which Takabatake (Hiroshima Univ.) studied experimentally.(5) Band structure calculations have been carried out on many rare-earth compounds by Hasegawa (Niigata Univ.) and Harima (Osaka Univ.). They have brought important information on electronic structure through a comparison with de Hans- van Alphen experiments by Onuki (Osaka Univ.). Hasegawa et. al. have develped a theory of relativistic current and spin density functional. It is hoped that it is successfully applied to actinide compounds. Less