Theory of Superconductivity in Strong Correlated Electron Systems

强相关电子系统中的超导理论

• 批准号: 12640346
• 负责人: YAMADA Kosaku
• 金额: $ 2.43万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640346/
• 关键词: Fermi liquid; Electron Correlation; Superconductivity; Heavy fermion; d-wave pairing; p-wave pairing; Sr_2RuO_4; Uni_2Al_3; CeIn_3; 3重相関; 重い電子系; スピン三重項; UPd_2Al_3; フェルミ液体; スピン3重項; 高温超伝導; スピン三重項超伝導; 電子相関; 遷移金属酸化物; 擬ギャップ; モット転移

This year we have made clear the following points.1. The microscopic superconducting mechanism in heavy fermion systems is studied by using the perturbation theory with respect to the onsite Coulomb repulsion U. We have succeeded in explaining the superconducting mechanism of CeCoIn_5, CeRhIn_5, UPd_2Al_3, UNi_2Al_3, CeCu_2Si_2 and CeIn_3. Our calculation derives the triplet pairing for UNi_2Al_3 in good agreement with the Knight shift measurement.2. The theory of superconductivity on Sr_2RuO_4 has been extended to the three band model and explained well the triplet pairing.Thus our strategy to study the superconductivity in strongly correlated electron systems is shown to be useful and has been developed.

今年我们明确了以下几点： 一．利用关于现场库仑斥力U的微扰理论研究了重费米子体系的微观超导机理。我们成功地解释了CeCoIn_5、CeRhIn_5、UPd_2Al_3、UNi_2Al_3、CeCu_2Si_2和CeIn_3的超导机理。我们的计算得出了UNi_2Al_3的三重态配对，与奈特位移测量非常吻合。2． Sr_2RuO_4超导理论已推广到三能带模型，并很好地解释了三重态配对。因此，我们研究强关联电子系统中超导性的策略被证明是有用的，并得到了发展。

项目成果

Y.Nishikawa, K.Yamada: "A Mechanism of Spin-Triplet Superconductivity in Hubbard Model on Triangular Lattice Application to BNi_2Al_3"J. Phys. Soc. Jpn.. 71・11. 2629-2632 (2002)

Y. Nishikawa，K. Yamada：“哈伯德模型中的自旋三重态超导机制在 BNi_2Al_3 中的应用” J. Jpn.. 71・11 (2002)

Y.Nisikawa, K.Yamada: "A Mechanism of Spin-Triplet Superconductivity in Hubbard Model on Triangular Lattice-Application to UNi_2Al_3"J. Phys. Soc. Jpn.. 71・11. 2629-2632 (2002)

Y. Nisikawa、K. Yamada：“三角形晶格的哈伯德模型中的自旋三重态超导机制 - 在 UNi_2Al_3 中的应用” J. Jpn.. 71・11 (2002)

T.Nomura and K.Yamada: "Perturbation Theory of Spin-Triplet Superconductitity for Sr_2RuO_4"J.Phys.Soc.Jpn.. 69・11. 3678-3688 (2000)

T.Nomura和K.Yamada：“Sr_2RuO_4的自旋三重态超导的微扰理论”J.Phys.Soc.Jpn.. 69・11 (2000)

T.Nomura, K.Yamada: "Theory of the Spin-Triplet Superconductivity in Sr_2RuO_4 Based on perturbation Approach to Three-Band Hubbard Model"J. Phys. Chem. Solids. 63. 1337-1341 (2002)

T.Nomura，K.Yamada：“基于三能带哈伯德模型微扰方法的Sr_2RuO_4自旋三重态超导理论”J。

T.Nomura, K.Yamada: "Roles of Electron Correlations in the Spin-Triplet Superconductivity of Sr_2RuO_4"J. Phys. Soc. Jpn.. 71・8. 1993-2004 (2002)

T.Nomura、K.Yamada：“Sr_2RuO_4 的自旋三重态超导性中的电子相关性”Jpn.. 1993-2004。