スピン・電荷・軌道系の基礎理論

• Project/Area Number: 12046218
• Research Category: Grant-in-Aid for Scientific Research on Priority Areas
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: The University of Tokyo
• Principal Investigator: 永長 直人 東京大学, 大学院・工学系研究科, 教授 (60164406)
• Co-Investigator(Kenkyū-buntansha): 宮下 精二 東京大学, 大学院・工学系研究科, 教授 (10143372) ; 小形 正男 東京大学, 大学院・理学系研究科, 助教授 (60185501) ; 福山 秀敏 東北大学, 金属材料研究所, 教授 (10004441) ; 今田 正俊 東京大学, 物性研究所, 教授 (70143542)
• Project Period (FY): 2000 – 2003
• Project Status: Completed (Fiscal Year 2003)
• Budget Amount: ¥34,100,000 (Direct Cost: ¥34,100,000); Fiscal Year 2003: ¥7,700,000 (Direct Cost: ¥7,700,000); Fiscal Year 2002: ¥10,400,000 (Direct Cost: ¥10,400,000); Fiscal Year 2001: ¥8,200,000 (Direct Cost: ¥8,200,000); Fiscal Year 2000: ¥7,800,000 (Direct Cost: ¥7,800,000)
• Keywords: スピン / 電荷 / 軌道 / 遷移金属酸化物 / 高温超伝導 / 磁性体 / 量子臨界現象 / トポロジー / 起動

Research Abstract

強相関電子系におけるスピン・軌道・電荷の自由度が織り成す多彩な現象を、量子モンテカルロ法、大規模行列厳密対角化等の数値的手法と、場の理論等の解析的手法の双方から調べた。具体的な成果は以下のとおりである。
(1)スピン液体に関して、(i)3角格子上のハバード模型において磁気秩序が存在しない新奇なスピン液体状態を理論的に見出した。(ii)3角格子上のハバード模型やt-J模型に関して、その超伝導状態の対称性に関する研究を行い、時間反転対称性の破れたペアー形成やスピン3重項状態の可能性を見出し、コバルト酸化物超伝導体の物性を議論した。
(2)軌道とスピンに関連した現象として、(i)ルテニウム酸化物、バナジウム酸化物を対象に、ヤーンテラー効果の大きさを定量的に評価し、軌道自由度の量子揺らぎの大きさを検討した。その結果、t2g電子でも軌道はほとんど古典的に振舞うことが見出された。(ii)異常量子ホール効果の第一原理計算を実行し、運動量空間におけるモノポールを見出すとともに、実験をほぼ完全に再現することに成功した。(iii)ESRの量子ダイナミックスを取り扱う理論を発展させた。(iv)チタン酸化物の軌道状態を理論的に調べ、最近の実験とよく符合する結果を得た。
(3)高温超伝導体と関連物質に関して、t-Jモデルにおける、電子格子相互作用を1/N展開で電子相関の効果を含めて調べ、光電子分光スペクトルの実験を検討した。

Research Products

• [Publications] Mishchenko AS, NagaosaN, et al.: "Optical conductivity of the Frohlich polaron"Phys.Rev.Lett.. 91・23. art.no.236401 (2003)
• [Publications] M.Mochizuki: "Orbital-Spin Structure and Lattice Coupling in RTiO_3 where R=La, Pr, Nd, and Sm"Phys.Rev.Lett.. 91. 167203 (2003)
• [Publications] Motome Y, Furukawa N, Nagaosa N: "Competing orders and disorder-induced insulator to metal transition in manganites"Phys.Rev.Lett.. 91・16. art.no.167204 (2003)
• [Publications] S.Onoda: "Mott Transitions in the Two-Dimensional Half-Filled Hubbard Model : Correlator Projection Method with Projective Dynamical Mean-Field Approximation"Physical Review B. 67. 161102(1)-161102(4) (2003)
• [Publications] H.Tsuchiura, M.Ogata, Y.Tanaka, S.Kashiwaya: "Electronic states around a vortex core in high-T_c superconductors based on the t-J model"Physical Review B. 68. 012509 (2003)
• [Publications] Matsuura M, Endoh Y, Hiraka H, et al.: "Classical and quantum spin dynamics in the fcc antiferromagnet NiS2 with frustration"Physical Review B. 68・9. art.no.094409 (2003)
• [Publications] H.Onishi, S.Miyashita: "Effects of quantum lattice vibration on the spin-Peierls transition"Physica B. 329. 84-875 (2003)
• [Publications] K.Saito, S.Miyashita: "Enhancement of the thermal conductivity in the spin-Peierls system"Physica B. 329. 876-877 (2003)
• [Publications] S.Miyashita, N.Kojima: "Generalized Wajnflasz model for charge transfer spin-crossover phenomena"Progress of Theoretical Physics. 109・5. 729-739 (2003)
• [Publications] S.Miyashita, K.Saito, H.Kobayashi: "Parity effect in the resonant tunneling"Progress of Theoretical Physics. 109・5. 741-749 (2003)
• [Publications] S.Miyashita, K.Saito: "Real time scale simulation for quantum processes in dissipative environments"Physica B. 329. 1142-1143 (2003)
• [Publications] M.Nishino, K.Saito, S.Miyashita: "Noise effect on resonant tunneling in the nanoscale molecular magnet(Fe-8)"Physics B. 329. 1170-1171 (2003)
• [Publications] Y.Yanase, M.Ogata: "Microscopic Identification of the D-vector in Triplet Superconductor Sr_2RuO_4"Journal of Physical Society of Japan. 72. 673-687 (2003)
• [Publications] S.Miyashita, A.Ogasahara: "Efffects of Dzyaloshinsky-Moriya interaction on ESR of Shastry-Sutherland model"Journal of the Physical Society of Japan. 72・9. 2350-2356 (2003)
• [Publications] T.Koretsune, M.Ogata: "Ferromagnetism on the Frustrating Lattices"Journal of Physical Society of Japan. 72. 2437-2440 (2003)
• [Publications] Z.Hiroi, K.Matsuhira, M.Ogata: "Ferromagnetic Ising Spin Chains Emerging from the Spin-Ice under Magnetic Field"Journal of Physical Society of Japan. 72. 3045-3048 (2003)
• [Publications] M.Saito, T.Sasaki, H.Fukuyama: "Orbital magnetism in two-dimensional mesoscopic ring systems"Journal of the Physical Society of Japan. 72・10. 2556-2567 (2003)
• [Publications] S.Miyashita, H.De Raedt, K.Mishielsen: "Directionally independent energy gap formation due to the hyperfine interaction"Progress of theoretical physics. 110・5. 889-899 (2003)
• [Publications] Murakami S, Nagaosa N, Zhang SC: "Dissipationless quantum spin current at room temperature"SCIENCE. 301・5638. 1348-1351 (2003)
• [Publications] Fang Z, Nagaosa N, Takahashi KS, et al.: "The anomalous Hall effect and magnetic monopoles in momentum space"SCIENCE. 302・5642. 92-95 (2003)
• [Publications] Lee PA, Nagaosa N: "Collective modes in the superconducting ground states in the gauge theory description of the cuprates"Physical Review B. 68・2. art.no.024516 (2003)
• [Publications] T.Mizusaki: "Precise Estimation of Shell Model Energy by Second-Order Extrapolation Method"Physical Review C. 67. 041301 (2003)
• [Publications] Nagaosa N, Lee TK, Ho CM, et al.: "Theory of slightly doped Mott insulator"PHYSICA C. 388. 15-18 (2003)
• [Publications] Murakami S, Nagaosa N: "Superconductivity with nonzero Chern numbers"PHYSICA C. 388. 53-54 (2003)
• [Publications] Onoda M, Nagaosa N: "Quantized anomalous Hall effect in two-dimensional ferromagnets : Quantum Hall effect in metals"Phys.Rev.Lett.. 90・20. art.no.206601 (2003)
• [Publications] Onoda S, Nagaosa N: "Spin chirality fluctuations and anomalous Hall effect in itinerant ferromagnets"Phys.Rev.Lett.. 90・19. art.no.196602 (2003)
• [Publications] Murakami S, Nagaosa N: "Colossal magnetoresistance in manganites as a multicritical phenomenon"Phys.Rev.Lett.. 90・19. art.no.197201 (2003)
• [Publications] Motome Y, Seo H, Fang Z, et al.: "One-dimensional confinement and enhanced Jahn-Teller instability in LaVO3"Phys.Rev.Lett.. 90・14. art.no.146602 (2003)
• [Publications] Lee TK, Ho CM, Nagaosa N, et al.: "Theory for slightly doped antiferromagnetic Mott insulators"J LOW TEMP PHYS. 131・3-4. 169-179 (2003)
• [Publications] M.Imada: "Path-Integral Renormalization Group Method"AIP Conference Proceedings : The Monte Carlo Method in the Physical Sciences Celebrating the 50^<th> Anniversary of the Metropolis Algorithm. 690. 207-217 (2003)
• [Publications] M.Imada: "Tools for Studying quantum Emergence near Phase Transitions"AIP Conference Proceedings : The International Conference in Highlights in Condensed Matter Physics. 695. 75-91 (2003)
• [Publications] M.Nishino, K.Boukheddaden, S.Miyashita, et al.: "Arrhenius Monte Carlo study of two-step spin crossover : Equilibrium and relaxation paths"Physical review B. 68・22. 224402-1-224402-10 (2003)
• [Publications] 妹尾仁嗣, 鹿野田一司, 福山秀敏: "分子性結晶における電荷秩序"日本物理学会誌. 58・11. 801-808 (2003)
• [Publications] N.Todoroki, S.Miyashita: "Ordered phase and phase transitions in the stacked triangular antiferromagnetic CsCoCl_3 and CsCoBr_3"Journal of the Physical Society of Japan. 73・2. 412-416 (2004)
• [Publications] Y.Yamada, N.Todoroki, S.Miyashita: "Theory of ferromagnetic phase transition in SrTiO_3 isotope replacement"Physical review B. 69. 024103-024111 (2004)
• [Publications] T.Mizusaki: "Quantum-Number Projection in the Path-Integral Renormalization Group Method"Phys.Rev.B. (to appear).
• [Publications] S.Watanabe: "Precise Determination of Phase Diagram for Two-Dimensional Hubbard Model with Filling- and Bandwidth-Control Mott Transitions : Grand-Canonical Path-Integral Renormalization Group Approach"J.Phys.Soc.Jpn.. (to appear).
• [Publications] T.Mizusaki, M.Imada: "Extrapolation Method for Shell Model Calculations"Phvs.Rev.C. 65. 064319-064322 (2002)
• [Publications] A.Himeda, T.Kato, M.Ogata: "Stripe States with Spacially Oscillating d-Wave Superconductivity in the Two-Dimensional t-t'-J Model"Phys.Rev.Lett.. 88. 117001-1-117001-4 (2002)
• [Publications] Y.Noda, M.Imada: "Quantum Phase Transitions to Charge Order and Wigner Crystal Under Interplay of Lattice Commensurability and Long-Range Coulomb Interaction"Phys.Rev.Lett.. 89. 176803-176806 (2002)
• [Publications] A.Ogasawara, S.Miyashita: "Direct Numerical Analysis of ESR Line Shape In Low Dimensional Spin Systems"Mol.Cryst.Liq.Cryst.. 376. 321-326 (2002)
• [Publications] S.Miyashita, M.Nishno, K.Saito: "Quantum Dynamics and Response In Nanoscale Spin Systems"Mol.Cryst.Liq.Cryst.. 376. 327-334 (2002)
• [Publications] H.De Raedt, K.Michielsen, A.hams, S.Miyashita, K.Saito: "Quantum spin dynamics as a model for quantum computer operation"Eur.Phvs.J.B. 27. 15-28 (2002)
• [Publications] S.Miyashita, K.Saito, H.Nakano, M.Nishno: "Quantum Mechanical Dynamics in Mocroscopic Structures"Mol.Cryst.Liq.Cryst.. 379. 475-482 (2002)
• [Publications] H.Fukuyama, T.Sasaki, K.Yokoyama, Y.Ishikawa: "Orbital Magnetism in Confirmed Two-Dimensional System"J.Low Temper.Phys.. 126・3/4. 1067-1080 (2002)
• [Publications] Murakami S, Shindou R, Nagaosa N, et al.: "Lattice distortion and ferromagnetism in C_a B6"J.Phys.Chem.Sol.. 63・6-8. 1285-1287 (2002)
• [Publications] M.Ogata: "Spin Triplet Superconductivity in Sr_2 RuO_4 : Anisotropic Antiferromagnetis Spin-Fluctuation"J.Phys.Chem.Sol.. 63. 1329-1332 (2002)
• [Publications] T.Koretsune, M.Ogata: "The ground state energy and entropy of the two-dimensional t-J model"J.Phys.Chem.Sol.. 63. 1419-1422 (2002)
• [Publications] A.Himeda, M.Ogata: "The effect of the negative t' term on the stripe formation in the two-dimensional t-J model"J.Phys.Chem.Solid. 63. 1423-1426 (2002)
• [Publications] C, Hotta, H.Fukuyama: "Ferromagnetism in CaB6"J.Phys.Chem.Sol.. 63・6-8. 1505-1509 (2002)
• [Publications] H.Nakano, S.Miyashita: "Magnetization process of iron cluster with ring structure"J.Phys.Chem.Sol.. 63・6-8. 1519-1521 (2002)
• [Publications] Y.Saiga, Y., M.Imada: "Competition between Spin Exchange and Correlated Hopping"J.Phys.Chem.Sol.. 63・6-8. 1531-1535 (2002)
• [Publications] A.S.Mishchenko, N.Nagaosa: "Interplay of magnetic frustrations and lattice instability"J.Phys.Chem.Sol.. 63・6-8. 1603-1606 (2002)
• [Publications] T.Koretsune, M.Ogata: "Resonating-Valence-Bond States and Ferromagnetic Correlations in the Doped Triangular Mott Insulator"Phys.Rev.Lett.. 89. 116401-1-116401-4 (2002)
• [Publications] M.Onoda, N.Nagaosa: "Topological nature of anomalous Hall effect in ferromagnets"J.Phys.Soc.Jpn.. 71・1. 19-22 (2002)
• [Publications] S.Murakami, R.Shindou, N.Nagaosa, A.S.Mishchenko: "Lattice Distortion and Ferromagnetism in Ca_<1-x>La_xB_6"J.Phys.Soc.Jpn.. 71 Suppl.. 309-310 (2002)
• [Publications] M.Saito, M.Ogata: "Midgap States in Disordered Spin-Peierls Systems"J.Phys.Soc.Jpn.. 71. 721-724 (2002)
• [Publications] T.Sasaki, H.Fukuyama: "Electrical Conductance under Periodic Magnetic Field"J.Phys.Soc.Jpn.. 71・4. 1108-1117 (2002)
• [Publications] M.Mochizuki: "Spin and Orbital States and Their Phase Transitions of the Perovskite-Type Ti Oxides : Weak Coupling Approach"J.Phys.Soc.Jpn.. 71. 2039-2047 (2002)
• [Publications] H.Morita, S.Watanabe, M.Imada: "Nonmagnetic Insulating States near the Mott Transitions on Lattices with Geometrical Frustration and Implications for κ-(ET)2Cu2(CN)3"J.Phys.Soc.Jpn.. 71. 2109-2112 (2002)
• [Publications] M.Udagawa, M.Ogata, Z.Hiroi: "Exact Results of Ground-state Entropy for Ising Pyrochlore Magnets Under a Magnetic Field along [111] Axis"J.Phys.Soc.Jpn.. 71. 2365-2368 (2002)
• [Publications] M.Machida, K.Saito, S.Miyashita: "Frequency Dependence of Quantum Localization in a Periodically Driven System"J.Phys.Soc.Jpn.. 71. 2427-2433 (2002)
• [Publications] Keiji Saito, Seiji Miyashita: "Enhancement of the Thermal Conductivity in Gapped Quantum Spin Chains"J.Phys.Soc.Jpn.. 71. 2485-2488 (2002)
• [Publications] Hiroki Nakano, Seiji Miyashita: "Alternating Antisymmetric Interaction in Nanoscale Iron Ring"J.Phys.Soc.Jpn.. 71. 2580-2581 (2002)
• [Publications] H.Ohta, K.Kirita, T.Kunimoto, S.Okubo, Y.Hosokoshi, K.Katoh, K.Inoue, A.Ogasahara, S.Miyashita: "Low Dimensionality Observed by ESR Measurements in S=1/2 Spin Ladder Substance BIP-TENO (3,3', 5,5'-tetrakis (N-tert-butylaminoxyl) biphenyl)"J.Phys.Soc.Jpn.. 71. 2640-2643 (2002)
• [Publications] H.Tsuchiura, S.Uno, Y.Tanaka, M.Ogata, J.Inoue, S.Kashiwaya: "Vortex tunneling spectra of high-T_c superconductors based on the t-J model"Physica C. 367. 20-23 (2002)
• [Publications] Z.-X.Shen, A.Lanzara, S.Ishihara, N.Nagaosa: "Role of electron-phonon interaction in the strongly correlated cuprates superconductors"Phil.Mag.B. 82・13. 1349-1368 (2002)
• [Publications] H.Seo, M.Ogata, H.Fukuyama: "Aspects of the Verwey Transition in Magnetite"Phys.Rev.B. 65・8. 085107-1-085107-7 (2002)
• [Publications] C.Hotta, H.Fukuyama: "Possible Ferromagnetism in Divalent Boride Systems"Phys.Rev.B. 65・18. 184421-1-184421-5 (2002)
• [Publications] M.Onoda, N.Nagaosa: "Particle-hole symmetry and transport properties of the flux state in underdoped cuprates"Phys.Rev.B. 65. 214502-1-214502-12 (2002)
• [Publications] S.Murakami, R.Shindou, N.Nagaosa, A.S.Mishchenko: "Theory of excitonic states in C_aB6"Phys.Rev.B. 66. 184405 (2002)
• [Publications] A.S.Mishchenko, N.Prokofiev, A.Sakamoto, N.Nagaosa: "Self-trapping in Rashba-Pekar model"Phys.Rev.B. 66. 020301 (2002)
• [Publications] N.Todoroki, Y.Ueno, S.Miyashita: "Order phase and phase transitions in the three-dimensional generalized six-state clock model"Phys.Rev.B. 66. 214405(8) (2002)
• [Publications] H.Seo, M.Ogata, H.Fukuyama: "Orbital Ordering and Bond Dimerization in Magnetite Fe3O4"Physica B. 312. 691-693 (2002)
• [Publications] M.Ogata, A.Himeda: "Superconductivity and Antiferromagnetism in an Extended Gutzwiller Approximation for t-J Model : Effect of Double-Occupancy Exclusion"J.Phys.Soc.Jpn.. 72. 374-391 (2002)
• [Publications] Luty T, Cailleau H, Koshihara S, E.Collet, N.Nagaosa, Y.Tokura et al.: "Static and dynamic order of cooperative multi-electron transfer"Europhys.Lett.. 59・4. 619-625 (2002)
• [Publications] H.Onishi, S.Miyashita: "Quantum Narrowing Effect in a Spin-Peierls System with Quantum Lattice Fluctuation"J.Phys.Soc.Jpn.. 72. 392-398 (2003)
• [Publications] I.Chiorescu, W.Wernsdorfer, A.Mller, S.Miyashita, B.Barbara: "Adiabatic Landau-Zener-Stckelberg transition with or without dissipation in the low-spin molecular system V15"Phys.Rev.B. 67. 020402(4) (2003)
• [Publications] Zhong Fang, Nagaosa N, Kiyoyuki Terakura: "Anisotropic optical conductivities due to spin and orbital ordering in LaVO3 and YVO3 First-principles studies"Phys.Rev.B. 67. 035101 (2003)
• [Publications] S.Murakami, N.Nagaosa: "Berry Phase in Magnetic Superconductors"Phys.Rev.Lett.. 90. 057002 (2003)
• [Publications] T.K.Lee, Chang-Ming Ho, N.Nagaosa: "Theory for Slightly Doped Antiferromagnetic Mott Insulators"Phys.Rev.Lett.. 90. 067001 (2003)
• [Publications] M.Nishino, S.Miyashita, K.Boukheddaden: "Effective interaction range in the spin crossover"J.Chem.Phys.. (in press). (4) (2003)
• [Publications] A.Ogasahara, S.Miyashita: "ESR Line Shape in Strongly Interacting Spin Systems"J.Phys.Soc.Jpn.. 72(in press). (6) (2003)
• [Publications] Y.Yanase, M.Ogata: "Microscopic Identification of the D-vector in Triplet Superconductor Sr_2RuO_4"J.Phys.Soc.Japan. 72. (2003)
• [Publications] S.Miyashita, K.Saito: "Real time scale simulation for quantum process in dissipative environments"Physica B. (in press). (2) (2003)
• [Publications] S.Onoda, S., M.Imada: "Operator Projection Theory for Electron Differentiation in Underdoped Cuprate Superconductors"J.Phys.Chem.Solids. (in press).
• [Publications] M.Matsuura, Y.Endoh, H.Hiraka, K.Yamada, A.S.Mishchenko, N.Nagaosa, I.V.Solovyev: "Classical and quantum spin dynamics in face-centered-cubic antiferromagnet NiSsub2 with frustration"Phys.Rev.B. (accepted). (2003)
• [Publications] Ryo Maezono, Naoto Nagaosa: "Jahn-Teller effect and electron correlation in manganites"Phys.Rev.B. (accepted). (2003)
• [Publications] Yukitoshi Motome, Hitoshi Seo, Zhong Fang, Naoto Nagaosa: "One-dimensional confinement and enhanced Jahn-Teller instability in LaVO3"Physical Review Letters. (accepted). (2003)
• [Publications] 永長 直人: "物質の中の宇宙論"岩波書店. 97 (2002)
• [Publications] 福山秀敏, 小形正男: "物理数学I"朝倉書店. (2003)
• [Publications] 妹尾仁嗣, 鹿野田一司, 福山秀敏: "解説「分子性結晶における電荷秩序"日本物理学会誌(執筆中).
• [Publications] Y.Taguchi et al.: "Spin chirality, Berry phase, and anomalous Hall effect in a frustrated ferromagnet"Science. 291. 2573 (2001)
• [Publications] A.S.Mishchenko et al.: "Quasidegenerate self-trapping in one-dimensional charge transfer exciton"Phys. Rev. Lett.. 86・20. 4624-4627 (2001)
• [Publications] C.-M.Ho et al.: "Nature of Spin Excitations in Two-Dimensional Mott Insulators : Undoped Cuprates and Other Materials"Phys. Rev. Lett.. 86. 1626-1629 (2001)
• [Publications] R.Shindou et al.: "Orbital ferromagnetism and anomalous Hall effect in antiferromagnets on the distorted fcc lattice"Phys. Rev. Lett.. 87・11. 6801-6804 (2001)
• [Publications] Chisa Hotta et al.: "Classification of the Ground States of Two-Dimensional Quarter-Filled Organic Conductors with Strong Dimerization"J. Phys. Soc. Jpn.. 70・2. 321-324 (2001)
• [Publications] S.Watarai et al.: "Entropy Effect on the Magnetization Process of Hexagonal XY-like Heisenberg Antiferromagnets"J. Phys. Soc. Jpn.. 70. 532-537 (2001)
• [Publications] Kimitaka Itoh et al.: "Transition of Radial Electric Field in Helical Systems"J. Phys. Soc. Jpn.. 70・6. 1575-1584 (2001)
• [Publications] Hiroki Nakano et al.: "Magnetization Process of Nanoscale Iron Cluster"J. Phys. Soc. Jpn.. 70. 2151-2157 (2001)
• [Publications] Tomokazu Matsuo et al.: "Application of Berezinskii's Diagram Method to Bond Disordered System with the Dimerization and the Staggered Field"J. Phys. Soc. Jpn.. 70・9. 2633-2644 (2001)
• [Publications] S.Miyashita et al.: "A Microscopic Mechanism For Rejuvenation And Memory effects In Spin Glasses"Euro. Phys. B. 22. 203-211 (2001)
• [Publications] K.Kuroki et al.: "Crib-shaped triplet-pairing gap function for an orthogonal pair of quasi-one-dimensional Fermi surfaces in Sr$ 2$RuO$ 4$"Phys. Rev. B. 63. 060506(R) (2001)
• [Publications] Hiroaki Onishi et al.: "Spin-Peierls transition of the first order in S=1 antiferromagnetic Heisenberg chains"Phys. Rev. B. 64. 14405(1-7) (2001)
• [Publications] H.Seo et al.: "Metallic State Driven by Frustrated Electronic Correlation in Cu-O Double Chain of PrBa$ 2$Cu$ 4$O$ 8$"Phys. Rev. B. 64. 2001-113103 (2001)
• [Publications] S.Miyashita et al.: "Quantum Tunneling in Halh-Interger Spin Systems"Prog. Thore. Phys.. 106・3. 533-549 (2001)
• [Publications] N.Nagaosa: "Competing orders and multicritical phenomena in strongly electronic systems"Physica C. 357. 53-60 (2001)
• [Publications] M.Onoda et al.: "Topological nature of anomalous Hall effect in ferromagnets"J. Phys. Soc. Jpn.. 71・1. 19-22 (2002)
• [Publications] S.Murakami et al.: "Theory of ferromagnetism in Ca$ {1-x}$La$ x$B$ 6$"Phys. Rev. Lett.. (Accepted). (2002)
• [Publications] A.Himeda et al.: "Stripe States with Spatially Oscillaing d-wave superconductivity in the two dimensional $t$-$t'$-$J$ model"Phys. Rev. Lett.. (to appear). (2002)
• [Publications] C.Hotta et al.: "Possible ferromagnetism in divalent borides"Phys. Rev. B. (to appear). (2002)
• [Publications] H.Seo et al.: "Aspects of the Verwey transition in magnetite"Phys. Rev. B. (to appear). (2002)
• [Publications] M.Saito et al.: "Impurity Induced Midgap State and Magnetism in Spin-Peierls Systems"J. Phys. Soc. Jpn.. (to appear). (2002)
• [Publications] V.Ponomarenko et al: "Impurity pinning in transport through 1D Mott-Hubbard and spin gap insulators"Solid State Commun.. 114-1. 9-13 (2000)
• [Publications] M.Nishimoto et al.: "Local magnetic structures induced by inhomogeneities of the lattice in S=1/2 bond-althernating chains and their response to a time-dependent magnetic field with noise."Physical Review.B.. 61-6. 9463-9471 (2000)
• [Publications] K.Ohgushi et al.: "Spin anisotropy and quantum Hall effect in the Kagome lattice : Chiral spin state based on a ferromagnet"Physical Review.B.. 62-10. R6065-R6068 (2000)
• [Publications] R.Maezono et al.: "Complex orbital states in manganese oxides"Physical Review.B.. 62-17. 11576-11580 (2000)
• [Publications] A.Hams et al.: "Feedback effect on Landau-Zener-St[u-umlaut]ckelberg transitions in magnetic systems"Physical Review.B.. 62-21. 13880-13883 (2000)
• [Publications] H.Fukuyama et al.: "Spin-Gap and Disorder"J.Phys.Soc.Jpn.. 69-Suppl.B. 122-126 (2000)
• [Publications] H.Fukuyama et al.: "Interplay between Lattice Structure and Electronic Properties in Organic Conductors"J.Phys.Soc.Jpn.. 69-Suppl.B. 144-148 (2000)
• [Publications] N.Nagaosa: "Aspects of strong coupling in gauge theory of high-Tc cuprates"J.Phys.Soc.Jpn.. 69-Suppl.B. 26-31 (2000)
• [Publications] T.Arimori et al.: "Phase Diagram of Ising-Like Heisenberg Model on the Triangular Lattice with Degenerate Orbital Effect"J.Phys.Soc.Jpn.. 69-7. 2250-2260 (2000)
• [Publications] S.Murakami et al.: "Multicritical Phenomena of Superconductivity and Antiferromagnetism in Organic Conductor κ-(BEDT-TTF)_<2X>"J.Phys.Soc.Jpn.. 69-8. 2395-2398 (2000)
• [Publications] C.Hotta et al.: "Effects of Localized Spins in Quasi-Two Dimensional Organic Conductors"J.Phys.Soc.Jpn.. 69-8. 2577-2596 (2000)
• [Publications] H.Onishi et al.: "Temperature Dependence of Spin and Bond Ordering in a Spin-Peierls System."J.Phys.Soc.Jpn.. 69-8. 2634-2641 (2000)
• [Publications] M.Yumoto et al.: "Impurity Effects on Quantum Depinning of Commensurate Charge Density Waves"J.Phys.Soc.Jpn.. 69-9. 2953-2961 (2000)
• [Publications] A.Ogasahara et al.: "ESR of Antiferromagnetic Cluster"J.Phys.Soc.Jpn.. 69-12. 4043-4048 (2000)
• [Publications] Y.Tokura et al.: "Orbital Physics in Transition-Metal Oxides"Science. 288-5465. 462-467 (2000)
• [Publications] H.Fukuyama et al.: "Interplay between Structure and Electronic Properties in Organic Conductors"Physica B. 280. 462-466 (2000)
• [Publications] H.Yamase et al.: "Possible Quasi-One-Dimensional Fermi Surface in LSCO : Phenomenological Study"Physica B. 284-288. 1375-1376 (2000)
• [Publications] H.Seo et al.: "Charge Ordering in Charge Transfer Organic Compounds"Physica B. 284-288. 1539-1540 (2000)
• [Publications] H.Yamase et al.: "Quasi-One-Dimensional Band in the t-J Model"Physica C. 341-348. 321-322 (2000)
• [Publications] H.Tsuchiura et al.: "Local density of states around a magnetic impurity in high-Tc superconductors based on the t-J model"Phys.Rev.Lett.. 84-14. 3165-3168 (2000)
• [Publications] K.Kato et al.: "Quantum Phase Transition of the Randomly Diluted Heisenberg Antiferromagnet on a Square Lattice."Phys.Rev.Lett.. 84-18. 4204-4207 (2000)
• [Publications] A.Himeda et al.: "Spontaneous Deformation of the Fermi Surface due to Strong Correlation in the Two-Dimensional t-J Model"Phys.Rev.Lett.. 85-20. 4345-4348 (2000)
• [Publications] S.Watarai et al.: "Entropy effect on the magnetization process of Hexagonal XY-like Heisenberg antiferromagnets"J.Phys.Soc.Jpn.. 70. (2001)
• [Publications] C.Yasuda et al.: "Classical Correlation-Length Exponent in Non-Universal Quantum Phase Transition of Diluted Heisenberg Antiferromagnet"J.Phys.Soc.Jpn.. 70. (2001)
• [Publications] Y.Taguchi et al.: "Spin Chirality, Berry Phase, and Anomalous Hall Effect in a Frustrated Ferromagnet"to appear in Science. (2001)
• [Publications] 永長直人: "第3の自由度-軌道-の物理学"クバプロ. 11 (2000)