Design of new material by control of the orbital phase transition

In order to reveal the various properties influenced by p and f electrons，this project has designed new functional materials by performing the research of systems including pand f electrons with "design of new material by controlling orbital phase transition" taken aspurpose. In particular，the discovery of superconductivity in mgb_2 and elucidation of its fundamental properties wasimportant results.它已经掌握了B atoms in this material这两个dimensional sheet格式much contribute to the occurrence of superconductivity. Because of the charge transfer betweenorbital at superconducting state，charge density changed before and after superconducting transition from MEM/Rietveld analysis. .moreover,我们涉及我们的关系与超级条件和网络之间的关系格式by B atoms. From this point of viewwe successfully discovered the superconductor re_3b and re_7b_3 in Re-B system and w_7re_ <13>B ofwhich crystal结构was…B原子和其他这些新材料的基础属性更可靠。这不是前可能的grow large single crystal and elucidate the physical properties usingsingle crystal, however，the project performed the pioneering role in the design of new material. Because the strongcovalent bonding nature of B原子，mediated by sp orbital control the physical properties inmgb_2, this material is extremely unique.On the other hand，我们discovered the ferromagnetism in cab_2c_2 with no magnetic elements，但我们没有排除the ferromagnetismFe impurities may play an important role and the influence by strong sampledependence . however,这是关于当地加密结构的本地distortion，这是与魔法相关的material by the fine crystal structure analysis. More inspection is needed for supporting this资料result.For电子系统，我们已经在ceb_6和相关材料中选择了physical properties和orbital ordering。particular, we have observed that magnetic moment in ceb_6 existed among Ce site. Less

In order to reveal the various properties influenced by p and f electrons, this project has designed new functional materials by performing the research of systems including p and f electrons with "design of new material by controlling orbital phase transition" taken as purpose. In particular, the discovery of superconductivity in MgB_2 and elucidation of its fundamental properties was important results. It was cleared that the 2 dimensional sheet formed by B atoms in this material much contribute to the occurrence of superconductivity. Because of the charge transfer between ヲミ and ヲメ orbital at superconducting state, the charge density changed before and after superconducting transition from MEM/Rietveld analysis. Moreover, we concentrated our interest to the relationship between the superconductivity and the network formed by B atoms. From this point of view, we successfully discovered the superconductor Re_3B and Re_7B_3 in Re-B system and W_7Re_<13>B of which crystal structure was … More stabilized by B atoms and elucidated the fundamental properties of these new materials. It has not been possible to grow large single crystal and elucidate the physical properties using single crystal, however, the project has performed the pioneering role in the design of new material. Because the strong covalent bonding nature of B atoms that mediated by sp orbital control the physical properties in MgB_2, this material is extremely unique.On the other hand, we discovered the ferromagnetism in CaB_2C_2 with no magnetic elements. But we have not excluded the possibility that Fe impurities may play an important role and the influence by strong sample dependence. However, it was considered that the local distortion of crystal structure was related to magnetism in this material by the fine crystal structure analysis. More inspection is needed for supporting this result.For f electron systems, we have revealed the physical properties and the orbital ordering in CeB_6 and related materials. In particular, we have observed that magnetic moment in CeB_6 existed among Ce site. Less