1990 Fiscal Year Annual Research Report

ヘビ-フェルミオンの理論研究

Research Project

Project/Area Number	02216114
Research Institution	Tokyo University of Science
Principal Investigator	芳田奎東京理科大学, 理工学部, 教授 (40013445)
Co-Investigator(Kenkyū-buntansha)	上田和夫筑波大学, 物質工学系, 助教授 (70114395) 山田耕作京都大学, 理学部, 助教授 (90013515) 斯波弘行東京工業大学, 理学部, 教授 (30028196) 福山秀敏東京大学, 物性研究所, 教授 (10004441) 立木昌東北大学, 金属材料研究所, 教授 (20028111)
Keywords	ヘビ-フェルミオン / 高濃度近藤 / コヒ-レント状態 / アクチナイド化合物 / 稀土類化合物 / 高温超伝導
Research Abstract	前年度に続き、アクチナイド、稀土類金属化合物の重い電子系、及び高温超伝導化合物を対象に、強い電子相関をもつ電子系に対する基本的理論研究を発展させ、いくつかの重要な成果をえた。その主な事項を以下に列挙する。 1).前年度に続いて、U(Th)Pt_3を対象に、重いフェルミ粒子系の超伝導間の転移の可能性を検討した。(上田、長岡) 2).周期的アンダ-ソン模型に立つフェルミ液体論の展開の一環として、高温超伝導体の正常状態におけるNMRの緩和時間、電気抵抗の異常が、強い反強磁性スピンのゆらぎに基くものとして、フェルミ液体論の枠組の中で理解できることを示した。またHall係数の異常部分、正常部分の計算を同じ立場に立って行った。(山田) 3).強い電子相関をもつ電子系の基本的特性を見るために、1次元ハバ-ド模型における運動量分布関数、スピン相関関数のフェルミ面近傍の特異性を、一般の電子密度に対して数値計算を援用し、Luttinger液体の特性として理解できることを明確にした。(斯波) 4).2次元ハバ-ド系がFermi液体であるか、あるいは1次元的なLuttinger液体かを調べるために、tーmatrix近似及び2次摂動の範囲で、フェルミ面の自己エネルギ-の特異性を調べた。(福山、山田) 5).Covalent mixingに基く簡単な模型を用いて、高温超伝導体YBa_2Cu_3O_7における2種類の格子点を占める ^<63>Cu、4種類の格子点の ^<17>Oの電場勾配の実験値がすべて矛盾なく説明できることを示した。(芳田) 6).強相関電子系においてHubbard gap内に生じるコヒ-レントバンドの従来の研究の発展として、その温度効果を調べた。(長岡、立木)

Research Products
(19 results)

All Other

All Publications (19 results)

[Publications] K.Ohara and K.Yosida: "A Modified SpinーWave Theory of the SquareーLattice Antiferromagnets II" Journal of the Physical Society of Japan. 59. 3341-3344 (1990)
[Publications] K.Hanzawa,F.Komatsu and K.Yosida: "The Electric Field Gradients from the OnーSite Holes at Cu and O Nuclei in YBa_2Cu_3O_7" Journal of the Physical Society of Japan. 59. 3345-3350 (1990)
[Publications] S.Ishihara,H.Matsumoto and M.Tachiki: "Effective Hamiltonian of Oxide Superconductors and a Narrow Band near the Fermi Level" Physical Review. B42. 10041-10051 (1990)
[Publications] M.Tachiki and H.Matsumoto: "Electronic State of Superconducting Copper Oxides" Journal of Magnetism and Magnetic Materials.
[Publications] H.Shiba and P.Fazekas: "Correlated FermiーLiquid Formed with Overlapping Kondo Clouds:a Variational Study" Progress of Theoretical Physics Supplement.
[Publications] M.Ogata,T.Sugiyama and H.Shiba: "MagneticーField Effects on Correlation Functions in OneーDimensional Strongly Correlated Hubbard Model" Physical Review.
[Publications] O.Narikiyo,K.Kuboki and H.Fukuyama: "Anyons in Extended tーJ Model" Journal of the Physical Society of Japan. 59. 2442-2456 (1990)
[Publications] H.Fukuyama,O.Narikiyo and Y.Hasegawa: "Perturbation Theory and Singularities in TwoーDimensional Hubbard Model at Low Electron Density" Journal of the Physical Society of Japan. 60. 372-375 (1991)
[Publications] K.Yamada and M.Nakano: "Magnetic Susceptibility in Heavy Fermion Systems" Progress of Theoretical Physics Supplement. 101. 419-428 (1990)
[Publications] H.Kohno and K.Yamada: "Analysis of Normal State Properties of High T_o Superconductors on the Basis of Fermi Liquid Theory" Progress of Theoretical Physics. 85. 13-29 (1991)
[Publications] T.Moriya,Y.Takahashi and K.Ueda: "Antiferromagnetic Spin Fluctuations and Superconductivity in TwoーDimensional Metals ーA Possible Model for High T_o Oxides" Journal of the Physical Society of Japan. 59. 2905-2915 (1990)
[Publications] K.Ueda and K.Yamamoto: "Ground State of the Kondo Lattice" Physica. B165&166. 397-398 (1990)
[Publications] K.Yamamoto and K.Ueda: "Ground State and Magnetization Process of the OneーDimensional Kondo Lattice" Journal of the Physical Society of Japan. 59. 3284-3288 (1990)
[Publications] K.Ueda,K.Yamamoto and R.Konno: "Magnetization process in heavy fermion system" Journal of Magnetism and Magnetic Materials. 90&91. (1990)
[Publications] M.Sigrist,T.M.Rice and K.Ueda: "Magnetic properties of time reversal breaking superconductors" Journal of Magnetism and Magnetic Materials. 90&91. (1990)
[Publications] M.Sigrist and K.Ueda: "Phenomenological Theory of Unconventional Superconductivity" Review of Modern Physics.
[Publications] T.Saso: "Study of Two Impurity Kondo Problem by SelfーConsistent Perturbation Approach" Physica. B165&166. 405-406 (1990)
[Publications] F.J.Ohkawa: "Magnetoresistance of Kondo lattices" Physical Review Letters. 64. 2300-2303 (1990)
[Publications] F.J.Ohkawa: "Magnetism and superconductivity in the tーJ model" Physical Review. B42. 4163-4174 (1990)

1990 Fiscal Year Annual Research Report

ヘビ-フェルミオンの理論研究

Principal Investigator

芳田 奎 東京理科大学, 理工学部, 教授 (40013445)

Research Products

[Publications] K.Ohara and K.Yosida: "A Modified SpinーWave Theory of the SquareーLattice Antiferromagnets II" Journal of the Physical Society of Japan. 59. 3341-3344 (1990)

[Publications] K.Hanzawa,F.Komatsu and K.Yosida: "The Electric Field Gradients from the OnーSite Holes at Cu and O Nuclei in YBa_2Cu_3O_7" Journal of the Physical Society of Japan. 59. 3345-3350 (1990)

[Publications] S.Ishihara,H.Matsumoto and M.Tachiki: "Effective Hamiltonian of Oxide Superconductors and a Narrow Band near the Fermi Level" Physical Review. B42. 10041-10051 (1990)

[Publications] M.Tachiki and H.Matsumoto: "Electronic State of Superconducting Copper Oxides" Journal of Magnetism and Magnetic Materials.

[Publications] H.Shiba and P.Fazekas: "Correlated FermiーLiquid Formed with Overlapping Kondo Clouds:a Variational Study" Progress of Theoretical Physics Supplement.

[Publications] M.Ogata,T.Sugiyama and H.Shiba: "MagneticーField Effects on Correlation Functions in OneーDimensional Strongly Correlated Hubbard Model" Physical Review.

[Publications] O.Narikiyo,K.Kuboki and H.Fukuyama: "Anyons in Extended tーJ Model" Journal of the Physical Society of Japan. 59. 2442-2456 (1990)

[Publications] H.Fukuyama,O.Narikiyo and Y.Hasegawa: "Perturbation Theory and Singularities in TwoーDimensional Hubbard Model at Low Electron Density" Journal of the Physical Society of Japan. 60. 372-375 (1991)

[Publications] K.Yamada and M.Nakano: "Magnetic Susceptibility in Heavy Fermion Systems" Progress of Theoretical Physics Supplement. 101. 419-428 (1990)

[Publications] H.Kohno and K.Yamada: "Analysis of Normal State Properties of High T_o Superconductors on the Basis of Fermi Liquid Theory" Progress of Theoretical Physics. 85. 13-29 (1991)

[Publications] T.Moriya,Y.Takahashi and K.Ueda: "Antiferromagnetic Spin Fluctuations and Superconductivity in TwoーDimensional Metals ーA Possible Model for High T_o Oxides" Journal of the Physical Society of Japan. 59. 2905-2915 (1990)

[Publications] K.Ueda and K.Yamamoto: "Ground State of the Kondo Lattice" Physica. B165&166. 397-398 (1990)

[Publications] K.Yamamoto and K.Ueda: "Ground State and Magnetization Process of the OneーDimensional Kondo Lattice" Journal of the Physical Society of Japan. 59. 3284-3288 (1990)

[Publications] K.Ueda,K.Yamamoto and R.Konno: "Magnetization process in heavy fermion system" Journal of Magnetism and Magnetic Materials. 90&91. (1990)

[Publications] M.Sigrist,T.M.Rice and K.Ueda: "Magnetic properties of time reversal breaking superconductors" Journal of Magnetism and Magnetic Materials. 90&91. (1990)

[Publications] M.Sigrist and K.Ueda: "Phenomenological Theory of Unconventional Superconductivity" Review of Modern Physics.

[Publications] T.Saso: "Study of Two Impurity Kondo Problem by SelfーConsistent Perturbation Approach" Physica. B165&166. 405-406 (1990)

[Publications] F.J.Ohkawa: "Magnetoresistance of Kondo lattices" Physical Review Letters. 64. 2300-2303 (1990)

[Publications] F.J.Ohkawa: "Magnetism and superconductivity in the tーJ model" Physical Review. B42. 4163-4174 (1990)

芳田奎東京理科大学, 理工学部, 教授 (40013445)