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。用微扰理论研究了重费米子系统的微观超导机制。我们成功地解释了CeCoIn_5、CeRhIn_5、UPd_2Al_3、UNi_2Al_3、CeCu_2Si_2和CeIn_3的超导机制。我们的计算得到了UNi_2Al_3的三重态对，与Knight位移测量结果非常吻合。将Sr_2RuO_4的超导理论扩展到三能带模型，很好地解释了三重态配对。因此，我们在强相关电子系统中研究超导性的策略是有用的，并且已经得到了发展。

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)

H.Fukazawa, K.Yamada: "Third Order Perturbation Analysis of Paring Symmetry in Two-Dimensional Hubbard Model"J. Phys. Soc. Jpn.. 71・6. 1541-1547 (2002)

H.Fukazawa、K.Yamada：“二维哈伯德模型中的配对对称性的三阶微扰分析”J. Phys. 71・6 (2002)

T. Nomura, K. Yamada: "Roles of Electron Correlations in the Spin-Triplet Superconductivity of Sri_2RuO_4"J. Phys. Soc. Jpn.. 71・8. 1993-2004 (2002)

T. Nomura、K. Yamada：“Sri_2RuO_4 的自旋三重态超导性中的电子相关性”Jpn. 71・8 (2002)。

T.Jujo, K.Yamada: "Pseudogap and Superconducting Gap in Strong Coupling Superconductors"J.chem. solids. 62. 211-214 (2001)

T.Jujo, K.Yamada：“强耦合超导体中的赝能隙和超导能隙”J.chem。