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

强电子关联晶体结构与材料设计的相关性研究

• 批准号: 01420005
• 负责人: ENDOH Yasuo
• 金额: $ 20.48万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (A)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01420005/
• 关键词: High temperature superconductivity; Magnetic correlations; Spin fluctuations; Cuprite oxides; Carrier; Strong electron correlations; Actinide compound; Crystal structure; La_<2ーx>Sr_xCuO_4; (Pr,Nd)_<2ーx>Ce_xCuO_4; キャリア-; 結晶歪; 強い電子相関; 回転陰極型X線発

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.

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。

项目成果

Y.Endoh,K.Yamada,K.Kakurai,M.Tatsuda,et al.: "Spin correlations in high temperature superconductors," Physica B. 174. 330-339 (1991)

Y.Endoh、K.Yamada、K.Kakurai、M.Tatsuda 等人：“高温超导体中的自旋相关性”，Physica B. 174. 330-339 (1991)

K.Yamada: "Threeーdimensional antiferromagnetic order and anisotropic magnetic properties in Bi_2CuO_4" J.Phys.Soc.Jpn.

K.Yamada：“Bi_2CuO_4 中的三维反铁磁序和各向异性磁性”J.Phys.Soc.Jpn。

K.Yamada,T.Omata,Y.Endoh,et al.: "Magnetic structure and weak ferromagnetism of La_2NO_<4+8>," Physica C. 15-22 (1992)

K.Yamada、T.Omata、Y.Endoh 等：“La_2NO_<4 8> 的磁性结构和弱铁磁性”，Physica C. 15-22 (1992)

K.Yamada: "Crystal and magnetic structures in high temperature superconducting cuprite oxides" J.Crystal Soc.Jpn.46. 55-66 (1991)

K.Yamada：“高温超导赤铜矿氧化物中的晶体和磁性结构”J.Crystal Soc.Jpn.46。

M.Lang,et al.: "Complex Phase Diagram of La_xCuO_4 near 35K"

M.Lang 等人：“35K 附近 La_xCuO_4 的复杂相图”