The Research on the Correlation Between Crystal Structure and Material Design for the Strong Electron Correlation

我们阐明了晶体结构和各种性质，如磁性，电子电导率等，从层状亚铜氧化物的同晶化合物。为了理解高温超导性与强电子关联之间的内在联系，对亚铜氧化物进行了深入的研究。类质同晶Ni氧化物在晶体结构和磁性方面都表现出了有趣的调制和变化，证实了这种调制和变化与电子导电性有着内在的联系.在空穴或电子掺杂的两种情况下，掺杂对反铁磁性的影响是不同的。那么掺杂的强度与载流子轨道密切相关.实验证明了载流子浓度与自旋相关长度之间的定量关系.自旋涨落由超导性的出现所主导。本课题组对锕系化合物中常见的强关联电子材料进行了研究。然后，与那些在赤铜矿氧化物超导体的相似之处，现在考虑。

We have elucidated the crystal structure and various properties such as magnetism, electronic conductivities etc., from the isomorphous compounds of the layerd cuprite oxide. Cuprite oxides have been thoroughly investigated in order to understand the inherent relation between high temperature superconductivity and strong electron correlations. The isomorphous Ni oxides show the interesting modulation and change in both crystal structure and magnetism, which is confirmed to have an intrinsic relation to the electronic conductivity.Main results are as follows.1. The doping effect on antiferromagnetism differs in two cases of either hole or electron doping. Then the strength of the doping is strongly related to the carrier orbital.2. The quantitative relation between the carrier concentration and the spin correlation length is experimentally proved.3. Spin fluctuations are dominated by the appearance of superconductivity.4. Actinide compounds which are common to be material with the strongly correlated electrons have been investigated in our group. Then the similarities with those in cuprite oxide superconductors are now considered.