1997 Fiscal Year Annual Research Report

モット転移系3d遷移金属酸化物の物質設計と物性開拓

Research Project

Project/Area Number	07237103
Research Institution	University of Tokyo
Principal Investigator	十倉好紀東京大学, 大学院・工学系研究科, 教授 (30143382)
Co-Investigator(Kenkyū-buntansha)	吉沢英樹東京大学, 物性研究所, 助教授 (00174912) 高野幹夫京都大学, 化学研究所, 教授 (70068138) 熊谷健一北海道大学, 理学部物理学科, 教授 (70029560) 安岡弘志東京大学, 物性研究所, 教授 (50026027) 藤森淳東京大学, 大学院・理学系研究科, 助教授 (10209108)
Keywords	モット転移 / ペロブスカイト / 巨大磁気抵抗効果 / 3d遷移金属酸化物 / 金属-絶縁体転移 / 電荷整列 / スピンラダー / 軌道整列
Research Abstract	3d遷移金属酸化物およびカルコゲン化・有機物を対象に,モット転移とその近傍にある異常な金属状態について,集中的・包括的な研究を行った。まず、フィリングとバンド幅を共に制御したペロブスカイト型Ti酸化物について、モット転移の臨界的挙動、特に量子臨界的近傍の金属相の特徴を電子比熱光スペクトル、光電子スペクトル、NMRの測定によって明らかにした。また、巨大磁気抵抗効果を示すペロブスカイト型Mn酸化物については、ホール濃度の関数としてのスピンダイナミクス、格子構造、電子構造の変化の様子が詳しく調べられ、軌道整列状態や軌道自由度が関係すると考えられる金属相の異常が検出された。 Mn酸化物,Ni酸化物に共通して見られる電荷整列の相転移については、良質単結晶試料を用いた。輸送現象、分光、中性子散乱測定が進められ、スピンと電荷と軌道の各自由度の揺らぎ/秩序と物性の相関が詳しく議論され始めた。一方、スピンラダー系での超伝導の発見によって最近関心を集めているスピンギャップを有するモット系、Cu、V、Co酸化物について、反強磁性との競合、ドープ状態でのスピン・電荷ダイナミクスなどの知見が良質試料を用いて得らた。

Research Products

(105 results)

All Other

All Publications (105 results)

[Publications] T.Saitoh: "Low energy κ-dependent electronic sturucture of the layered magnetoresistive oxide La_<1.2>Sr_<1.8>Mn_2O_7" MRS'97 Proceedings"Science and Technology of Magnetic Oxides". (in press). (1998)
[Publications] J.Q.Li: "Strnctural properties and charge ordering transition in LaSr_2Mn_2O_7" MRS'97 Proceedings"Science and Technology of Magnetic Oxides". (in press). (1998)
[Publications] V.Kiryukhin: "X-ray induced insulator-metal taransitions in CMR manganites" MRS'97 Proceedings"Science and Technology of Magnetic Oxides". (in press). (1998)
[Publications] D.S.Dessau: "κ-dependent electronic sturucture,a pseudogap,and strong coupling effects in a layered magnetoresistive oxide" MRS'97 Proceedings"Science and Technology of Magnetic Oxides". (in press). (1998)
[Publications] Y.Murakami: "Direct observation of charge-and orbital-ordering La_<0.5>Sr_<1.5>MnO_4" Phys.Rev.Lett.(in press). (1998)
[Publications] T.Ishikawa: "Optical probe of anisotropic and incoherent charge dynamics in a layered ferromagnet:La_<1.2>Sr_<1.8>Mn_2O_7" Phys.Rev.B. 57(in press). (1998)
[Publications] Y.Tokura: Current opinion in solid state & meterials Science. (in press). (1998)
[Publications] Y.Okimoto: "Photonic phase control of magnetic oxides" J.Lig.Cryst.Mol.Cryst.(in press). (1998)
[Publications] Y.Okimoto: "Charge ordering and disordering transitions in Pr_<1-x>Ca_xMnO_3" Phys.Rev.B. 57(in press). (1998)
[Publications] T.Mori: "Spatial properties of the photoinduced transition in Pr_<0.7>Ca_<0.3>MnO_3" J.Phys.Soc.Jpn.66. 3570-3576 (1997)
[Publications] A.Chainani: "Temperature dependence of the electronic structure of the charge-ordering manganite Pr_<0.5>Sr_<0.5>MnO_3" Phys.Rev.B. /bf56. R15513-R15516 (1997)
[Publications] T.Kimura: "Pressure-enhanced interplane tunneling magnetoresistance in a layered manganite crystal" Phys.Rev.Lett.79. 3720-3723 (1997)
[Publications] T.Katsufuji: "Transport and magnetic properties of a Mott-Hubbard system whose bandwidth and band filling are both controllable:R_<1-x>Ca_xTiO_<3+y/2>" Phys.Rev.B. 56. 10145-10153 (1997)
[Publications] Y.Moritomo: "Enhanced electron-lattice coupling in La_<1-x>Sr_xMnO_3 near the metal-insulator phase boundary" Phys.Rev.B. 56. 12190-12195 (1997)
[Publications] H.Kuwahara: "Spin-charge-lattice coupled phase transitions in bandwidth-controlled systems:(Nd,Sm)_<1/2>Sr_<1/2>MnO_3" Phys.Rev.B. 56. 9386-9396 (1997)
[Publications] H.Kuwahara: "Low-field colossal magnetoresistance in bandwidth-controlled manganites" J.Appl.Phys.81. 4954-4956 (1997)
[Publications] Y.Furukawa: "NMR study of ferromagnetic YTiO_3 and antiferromagnetic LaTiO_3" Physica B. 237-238. 39-40 (1997)
[Publications] Y.Moritomo: "Chemical and external pressure effects on ferromagnetic manganites" Physica B. 237-238. 26-27 (1997)
[Publications] Y.Tomioka: "Critical change of magnetoresistance with bandwidth and doping in perovskite manganites" Appl.Phys.Lett.70. 3609-3611 (1997)
[Publications] Y.Tokura: "Metal-insulator phenomena in perovskites of transition metal oxide" Physica B. 237-238. 1-5 (1997)
[Publications] Y.Tomioka: "Magnetic-field-induced metal-insulator transition in perovskite-type manganese oxides" Physica B. 237-238. 6-10 (1997)
[Publications] J.S.Zhou: "Pressure-induced polaronic to itinerant transition in La_<1-x>Sr_xMnO_3 crystals" Phys.Rev.Lett.79. 3234-3237 (1997)
[Publications] A.Asamitsu: "Current switching of resistive states in magnetoresistive manganites" Nature. 388. 50-52 (1997)
[Publications] J.Q.Li: "Charge ordered states in La_<1-x>Sr_xFeO_3" Phys.Rev.Lett.79. 4257-4260 (1997)
[Publications] H.Kawano: "Magnetic ordering and relation to the metal-insulator transition in Pr_<1-x>Sr_xMnO_3 and Nd_<1-x>Sr_xMnO_3 with x〜1/2" Phys.Rev.Lett.78. 4253-4256 (1997)
[Publications] S.Yamaguchi: "Local lattice distortion during the spin-state transition in LaCoO_3" Phys.Rev.B. 55. R8666-R8669 (1997)
[Publications] V.Kiryukhin: "An X-ray-induced insulator-metal transition in a magnetoresistive manganite" Nature. 386. 813-815 (1997)
[Publications] Y.Moritomo: "Bandwidth-and doping-dependent pressure effects on the ferromagnetic transition in perovskite manganites" J.Phys.Soc.Jpn.66. 556-559 (1997)
[Publications] Y.Moritomo: "Pressure effects on charge-ordering transitions in perovskite manganites" Phys.Rev.B. 55. 7549-7556 (1997)
[Publications] T.G.Perring: "Antiferromagnetic short range order in a two-dimensional manganite exhibiting giant magnetoresistance" Phys.Rev.Lett.78. 3197-3200 (1997)
[Publications] Y.Okimoto: "Variation of electronic structure in La_<1-x>Sr_xMnO_3(0【less than or equal】x【less than or equal】0.3)as investigated by optical conductivity spectra" Phys.Rev.B. 55. 4206-4214 (1997)
[Publications] Y.Tomioka: "Reentrant transition of the charge-ordered state in perovskite manganites" J.Phys.Soc.Jpn.66. 302-305 (1997)
[Publications] H.Yoshizawa: "Bandwidth-control-induced insulator-metal transition in Pr_<0.65>(Ca_<1-y>Sr_y)_<0.35>MnO_3 and Pr_<0.7>Ca_<0.3>MnO_3" Phys.Rev.B. 55. 2729-2732 (1997)
[Publications] M.Kasai: "Colossal magnetoresistance in Sm_<1-x>Sr_xMnO_3 films" J.Appl.Phys.80. 6894-6897 (1997)
[Publications] E.Pellegrin: "Soft X-ray magnetic circular dichroism study of the colossal magnetoresistance compound La_<1-x>Sr_xMnO_3" J.Elect.Spect.Rel.Pheno.86. 115-118 (1997)
[Publications] K.Maiti: "Electronic Structure of One-dimensional Cuprate Sr_2CuO_3" Europhys.Lett.37. 359-364 (1997)
[Publications] T.Mizokawa: "Photoemission and X-Ray Absorption Study of the Hole-Doped Ladder System La_<1-x>Sr_xCuO_<2.5>" Phys.Rev.B. 55. R13373-R13376 (1997)
[Publications] J.Matsuno: "Photoemission study of metal-insulator transition in CuIr_2S_4" Phys.Rev.B. 55. R15979-R15982 (1997)
[Publications] T.Mizokawa: "Spin,Charge and Orbital Ordering Mn Perovskite Oxides Studied by Model Hartree-Fock Calculations" Phys.Rev.B. 56. R493-R496 (1997)
[Publications] T.Saitoh: "Electronic Structure and Magnetic States in La_<1-x>Sr_xCoO_3 Studied by Photoemission and X-Ray Absorption Spectroscopy" Phys.Rev.B. 56. 1290-1295 (1997)
[Publications] A.Ino: "Chemical-Potential Shift in Overdoped and Underdoped La_<2-x>Sr_xCuO_4" Phys.Rev.Lett.79. 2101-2104 (1997)
[Publications] K.Fujioka: "Electronic Structure of SrRuO_3" Phys.Rev.B. 56. 6380-6383 (1997)
[Publications] T.Saitoh: "Temperature-Dependent Valence-Bnad Photoemission Spectra of La_<1-x>Sr_xMnO_3" Phys.Rev.B. 56. 8836-8840 (1997)
[Publications] T.Mizokawa: "Hartree-Fock Study of Charge-Ordered States in La_<1-x>Sr_xCuO_4 and La_<1-x>Sr_xNiO_4" Phys.Rev.B. 56. 11920-11924 (1997)
[Publications] T.Tsujioka: "Hubbard Splitting and Electron Correlation in the Ferromagnetic Metal CrO_2" Phys.Rev.B. 56. 15509-15512 (1997)
[Publications] E.Z.Kurmaev: "Excitation Energy Dependence of SL_<2,3> X-Ray Fluoresent Emission of BaNiS_2" Phys.Letters A. 235. 191-194 (1997)
[Publications] T.Mizokawa: "Description of Spin and Charge Domain Walls in Doped Perovskite-Type 3d Transition-Metal Oxides based on Superexchange" Phys.Rev.Lett.80. 1320-1323 (1998)
[Publications] A.Fujimori: "Photoemission Spectroscopy of Correlated Transition-Metal Compounds in the Charge-Transfer Regime" Physica B. 237-238. 137-141 (1997)
[Publications] K.Mamiya: "Photoemission Study of Pyrite-Type Transition-Metal Chalcogenides MS_<2-x>Se_x(M=Fe,Co,Ni)" Physica B. 237-238. 390-391 (1997)
[Publications] S.Suga: "High-Resolution Photoemission Study of Nd_<0.5>Sr_<0.5>MnO_3:Temperature Dependence and Resonance Spectra" Physica B. 237-238. 413-414 (1997)
[Publications] K.Ikushima: "Magnetic Properties in the Normal State of LuNi_2B_2C Observed by ^<61>Ni and ^<11>B NMR" J.Phys.Soc.Jpn.66. 1130-1137 (1997)
[Publications] H.Yasuoka: "Pseudo Spin Gap High-Tc Oxides observed by NMR" Hyperfine Interactions. 105. 27-34 (1997)
[Publications] A.Goto: "Phase diagram for the spin pseudogap in LaBa_2Cu_3O_y studied by NMR" Phys.Rev.B. 55. 12736-12741 (1997)
[Publications] N.Fujiwara: "Spin fluctuations in S=1/2 double-linear-chain LiV_2O_5 studied by ^7Li NMR" Phys.Rev.B. 55. 11945-11948 (1997)
[Publications] S.Fujiyama: "Anomalous Spin Excitation in the Metallic State of La_<2-x>Sr_xCuO_4 Observed by Cu NQR" J.Phys.Soc.Jpn.66. 2864-2869 (1997)
[Publications] T.Ohama: "The Orbital Character in the Spin-Peierls System NaV_2O_5" J.Phys.Soc.Jpn.66. 3008-3011 (1997)
[Publications] H.Yasuoka: "Pseudo Spin Gap in High-Tc's Manifested by the NMR Experiments" Physica C. 282-287. 119-122 (1997)
[Publications] M.Takano: "Impurity Effects on a 2-leg Spin Ladder Compound SrCu2O3" Physica C. 282-287. 149-152 (1997)
[Publications] K.Kumagai: "Local Distortions in the BiO_6 Ochtahera Sublattice of BaPb_xBi_<1-x>O_3 as seen by ^<137>Ba NMR/NQR" Physica C. 274. 209-220 (1997)
[Publications] Y.Matsuda: "Interlayer Phase Coherence in the Vortex State of Bi_2Sr_2CaCu_2O_8 Probed by Josephson Plasma Resonance" Phys.Rev.Lett.78. 1972-1975 (1997)
[Publications] K.Kumagai: "NMR Study of Carrier Doping Effects on Spin Gaps in Spin Ladder Sr_<14-x>A_xCu_<24>O_<41>(A=Ca,Y and La)" Phys.Rev.Lett.78. 1992-1995 (1997)
[Publications] Y.Matsuda: "Excitation of Josephson Plasma and Vortex Oscillation Modes in Bi_2Sr_2CaCu_2O_8 in Parallel Magnetic Fields" Phys.Rev.B. 55. R8685-R8688 (1997)
[Publications] Y.Furukawa: "NMR Study of Ferromagnetic YTiO_3 and Antiferromagnetic LaTiO_3" Physica B. 237-238. 156-158 (1997)
[Publications] S.Tsujj: "NMR Study of Metal-Insulator Transition Spinel CuIr_2(S_<1-x>Se_x)_4" Physica B. 237-238. 156-158 (1997)
[Publications] I.Chong: "Growth of Heavily Pb-Substituted Bi-2201 Single Crystals by a Floating Zone Method" Physica C. (1997)
[Publications] Y.Matsuda: "Interlayer Phase Coherence in the Vortex State of Bi_2Sr_2CaCu_2O_8 Proved by Josephson Plasma Resonance" Physica C. 282-287. 391-394 (1997)
[Publications] Y.Furukawa: "^<47/49>Ti and ^<139>La NMR Studies on Mott Transition in La_<1-x>Sr_xTiO_3" Physica C. 282-287. 1103-1104 (1997)
[Publications] Y.Furukawa: "NMR Study on a Metal-Insulator Transition in Oxysulfides(La_<1-x>Ca_xO)Cu_<1-x>Ni_xS" Physica C. 282-287. 1105-1106 (1997)
[Publications] S.Tsuji: "Metal-Insulator Transition in the Spinel CuIr_2(S_<1-x>Se_x)_4 System Studies by NMR" Physica C. 282-287. 1107-1108 (1997)
[Publications] K.Kumagai: "NMR Study of Hole-doping Effect on Spin Gaps in Sr_<14-x>A_xCu_<24>O_<41>(A=Ca,Y,and La)by NMR Studies" Physica C. 282-287. 1343-1344 (1997)
[Publications] A.Yamanaka: "NMR/NQR Stud ies of Hyperfine Field and Electric Field Gradient in RSr_2Cu_2GaO_7,RBa_2Cu_2NbO_8 and(R_<1-x>Ce_x)Sr_2Cu_2MO_<10>" Physica C. 282-287. 1363-1364 (1997)
[Publications] M.Kosugi: "Infuluence of Columner Defects on Interlayer Coherence in Bi_2Sr_2CaCu_2O_8 from Josephson Plasma Resonance" Physica C. 282-287. 2073-2074 (1997)
[Publications] M.B.Gaifulin: "Interlayer Josephson Coupling in the Vortex Solid State of Bi_2Sr_2CaCu_2O_8 from Josephson Plasma Resonance" Physica C. 282-287. 2221-2222 (1997)
[Publications] M.B.Gaifulin: "Collective Electromagneic Wave Excitation in Bi_2Sr_2CaCu_2O_8 in Magnetic Field Nealy Parallel to the CuO_2 Planes" Physica C. 282-287. 2429-2430 (1997)
[Publications] M.Kosugi: "Coupling Transition of the Vortex Liquid in Bi_2Sr_2CaCu_2O_8 with Columnar Defects" Phys.Rev.Lett.79. 3763-3766 (1997)
[Publications] M.Takano: "Impurity Effects on a 2-Leg Spin Ladder Compound SrCu_2O_3" Physica C. 282-287. 149-152 (1997)
[Publications] N.Kobayashi: "Compounds and Phase Relations in the SrO-CaO-CuO System under High Pressure" J.Solid State Chem.132. 274-283 (1997)
[Publications] T.Ohtani: "Phase Transitions in Quasi-One-Dimensional Selenide BaNbSe_3 and Superconductivity in BaNb_2Se_5" J.Solid State Chem.132. 274-283 (1997)
[Publications] H.Kageyama: "Magnetic Anisotropy of Ca_3Co_2O_6 with Ferromagnetic Ising Chains" J.Phys.Soc.Jpn.66. 3996-4000 (1997)
[Publications] T.Saitoh: "Temperature-Dependent Valence-Band Photoemission Spectra of La_<1-x>Sr_xMnO_3" Phys.Rev.B. 56. 8836-8840 (1997)
[Publications] M.Azuma: "Switching of the Gapped Single Spin-Liquid State to an Antiferromagnetically Ordered State in Sr(Cu_<1-x>Zn_x)_2O_3" Phys.Rev.B. 55. R8658-R8661 (1997)
[Publications] M.Takano: "High Pressure Synthesis in Inorganic Systems" Cur.Opin.in Sol.Sta.Mater.Sci.2. 166-173 (1997)
[Publications] T.Mizokawa: "Photoemission and X-Ray-Absorption Study of the Hole-Doped Ladder System La_<1-x>Sr_xCuO_<2.5>" Phys.Rev.B. 55. R13373-R13376 (1997)
[Publications] T.Saitoh: "Electronic Structure and Temperature-Induced Paramagnetism in LaCoO_3" Phys.Rev.B. 55. 4257-4266 (1997)
[Publications] T.Saitoh: "Electronic Structure and Magnetic States in La_<1-x>Sr_xCoO_3 Studied by Photoemission and X-Ray-Absorption Spectroscopy" Phys.Rev.B. 56. 1290-1295 (1997)
[Publications] K.Nozawa: "Transport Properties of a Quasi-One Dimensional Ladder Compound La_<1-x>Sr_xCuO_<2.5>" (1997)
[Publications] H.Yoshizawa: "Bandwidth-control induced insulator-metal transition in Pr_<0.65>(Ca_<1-y>Sr_y)_<0.35>MnO_3 and Pr_<0.7>Ca_<0.3>MnO_3" Phys.Rev.B. 55. 2729-2732 (1997)
[Publications] H.Kawano: "Magnetic ordering and relation to the metal-insulator transition in Pr_<1-x>Sr_xMnO_3 and Nd_<1-x>Sr_xMnO_3 with x〜1/2" Phys.Rev.Lett.78. 4253-4256 (1997)
[Publications] R.Kajimoto: "Charge ordering and spin dynamics in Pr_<1-x>Ca_xMnO_3" Physica B. (in press). (1998)
[Publications] H.Kawano: "Two-dimensional anisotropy in a layered metallic antiferromagnet RE_<1-x>Sr_xMnO_3 with x〜1/2" Physica B. (in press). (1998)
[Publications] H.Takagi: "Borocarbide superconductors-Materials and physical properties" Physica B. 237-238. 292-295 (1997)
[Publications] M.Azuma: "Switching of the gapped singlet spin-liquid state to an antiferromagnetically ordered state in Sr(Cu_<1-x>Zn_x)_2O_3" Phys.Rev.B. 55. 8658-8661 (1997)
[Publications] M.Nohara: "Magnetic Field Dependence of the Low-Temperature Specific Heat of the Borocarbide Superconductor LuNi_2B_2C" J.Phys.Soc.Jpn.66. 1888-1891 (1997)
[Publications] K.Ikushima: "Magnetic Properties in the Normal State of LuNi_2B_2C Observed by ^<61>Ni and ^<11>B NMR" J.Phys.Soc.Jpn.66. 1130-1137 (1997)
[Publications] S.Koshihara: "Ferromagnetic Order Induced by Photogenerated Carriers in Magnetic III-V Semiconductor Heterostructures of(In,Mn)As/GaSb" Phys.Rev.Lett.78. 4617-4620 (1997)
[Publications] M.Takano: "Impurity effects a 2-leg spin ladder compound SrCu_2O_3" Physica C. 282-287. 149-152 (1997)
[Publications] N.E.Hussey: "Anisotropic resistivity of YBa_2Cu_4O_8:incoherent to metallic crossover in the out-of-plane transport" Phys.Rev.B. 56. 11423-11426 (1997)
[Publications] N.E.Hussey: "Magneic field induced dimensional crossover in the normal state of YBa_2Cu_4O_8" Phys.Rev.Lett.(in press). (1998)
[Publications] Y.Maeno: "Electronic states of thr superconductor Sr_2RuO_4" Physica C. 282-287. 206-209 (1997)
[Publications] H.Takagi: "International scool of physics"Enrico Fermi"lecture note" (1997)
[Publications] T.Tonogai: "Proc.AIRAPT-16" (in press), (1998)
[Publications] 高木英典、野原実、分担執筆: "超伝導技術とその応用" 丸善, (1997)
[Publications] Y.Maeno: "High-Tc Superconductivity 1996:Ten Years after the Discovery" (1997)
[Publications] Y.Inoue: "Advances in Superconductivity IX" Springer-Verlag, 4 (1997)
[Publications] T.Ida: "Advances in Superconductivity IX" (1997)

1997 Fiscal Year Annual Research Report

モット転移系3d遷移金属酸化物の物質設計と物性開拓

Principal Investigator

十倉 好紀 東京大学, 大学院・工学系研究科, 教授 (30143382)

Research Products

[Publications] T.Saitoh: "Low energy κ-dependent electronic sturucture of the layered magnetoresistive oxide La_<1.2>Sr_<1.8>Mn_2O_7" MRS'97 Proceedings"Science and Technology of Magnetic Oxides". (in press). (1998)

[Publications] J.Q.Li: "Strnctural properties and charge ordering transition in LaSr_2Mn_2O_7" MRS'97 Proceedings"Science and Technology of Magnetic Oxides". (in press). (1998)

[Publications] V.Kiryukhin: "X-ray induced insulator-metal taransitions in CMR manganites" MRS'97 Proceedings"Science and Technology of Magnetic Oxides". (in press). (1998)

[Publications] D.S.Dessau: "κ-dependent electronic sturucture,a pseudogap,and strong coupling effects in a layered magnetoresistive oxide" MRS'97 Proceedings"Science and Technology of Magnetic Oxides". (in press). (1998)

[Publications] Y.Murakami: "Direct observation of charge-and orbital-ordering La_<0.5>Sr_<1.5>MnO_4" Phys.Rev.Lett.(in press). (1998)

[Publications] T.Ishikawa: "Optical probe of anisotropic and incoherent charge dynamics in a layered ferromagnet:La_<1.2>Sr_<1.8>Mn_2O_7" Phys.Rev.B. 57(in press). (1998)

[Publications] Y.Tokura: Current opinion in solid state & meterials Science. (in press). (1998)

[Publications] Y.Okimoto: "Photonic phase control of magnetic oxides" J.Lig.Cryst.Mol.Cryst.(in press). (1998)

[Publications] Y.Okimoto: "Charge ordering and disordering transitions in Pr_<1-x>Ca_xMnO_3" Phys.Rev.B. 57(in press). (1998)

[Publications] T.Mori: "Spatial properties of the photoinduced transition in Pr_<0.7>Ca_<0.3>MnO_3" J.Phys.Soc.Jpn.66. 3570-3576 (1997)

[Publications] A.Chainani: "Temperature dependence of the electronic structure of the charge-ordering manganite Pr_<0.5>Sr_<0.5>MnO_3" Phys.Rev.B. /bf56. R15513-R15516 (1997)

[Publications] T.Kimura: "Pressure-enhanced interplane tunneling magnetoresistance in a layered manganite crystal" Phys.Rev.Lett.79. 3720-3723 (1997)

[Publications] T.Katsufuji: "Transport and magnetic properties of a Mott-Hubbard system whose bandwidth and band filling are both controllable:R_<1-x>Ca_xTiO_<3+y/2>" Phys.Rev.B. 56. 10145-10153 (1997)

[Publications] Y.Moritomo: "Enhanced electron-lattice coupling in La_<1-x>Sr_xMnO_3 near the metal-insulator phase boundary" Phys.Rev.B. 56. 12190-12195 (1997)

[Publications] H.Kuwahara: "Spin-charge-lattice coupled phase transitions in bandwidth-controlled systems:(Nd,Sm)_<1/2>Sr_<1/2>MnO_3" Phys.Rev.B. 56. 9386-9396 (1997)

[Publications] H.Kuwahara: "Low-field colossal magnetoresistance in bandwidth-controlled manganites" J.Appl.Phys.81. 4954-4956 (1997)

[Publications] Y.Furukawa: "NMR study of ferromagnetic YTiO_3 and antiferromagnetic LaTiO_3" Physica B. 237-238. 39-40 (1997)

[Publications] Y.Moritomo: "Chemical and external pressure effects on ferromagnetic manganites" Physica B. 237-238. 26-27 (1997)

[Publications] Y.Tomioka: "Critical change of magnetoresistance with bandwidth and doping in perovskite manganites" Appl.Phys.Lett.70. 3609-3611 (1997)

[Publications] Y.Tokura: "Metal-insulator phenomena in perovskites of transition metal oxide" Physica B. 237-238. 1-5 (1997)

[Publications] Y.Tomioka: "Magnetic-field-induced metal-insulator transition in perovskite-type manganese oxides" Physica B. 237-238. 6-10 (1997)

[Publications] J.S.Zhou: "Pressure-induced polaronic to itinerant transition in La_<1-x>Sr_xMnO_3 crystals" Phys.Rev.Lett.79. 3234-3237 (1997)

[Publications] A.Asamitsu: "Current switching of resistive states in magnetoresistive manganites" Nature. 388. 50-52 (1997)

[Publications] J.Q.Li: "Charge ordered states in La_<1-x>Sr_xFeO_3" Phys.Rev.Lett.79. 4257-4260 (1997)

[Publications] H.Kawano: "Magnetic ordering and relation to the metal-insulator transition in Pr_<1-x>Sr_xMnO_3 and Nd_<1-x>Sr_xMnO_3 with x〜1/2" Phys.Rev.Lett.78. 4253-4256 (1997)

[Publications] S.Yamaguchi: "Local lattice distortion during the spin-state transition in LaCoO_3" Phys.Rev.B. 55. R8666-R8669 (1997)

[Publications] V.Kiryukhin: "An X-ray-induced insulator-metal transition in a magnetoresistive manganite" Nature. 386. 813-815 (1997)

[Publications] Y.Moritomo: "Bandwidth-and doping-dependent pressure effects on the ferromagnetic transition in perovskite manganites" J.Phys.Soc.Jpn.66. 556-559 (1997)

[Publications] Y.Moritomo: "Pressure effects on charge-ordering transitions in perovskite manganites" Phys.Rev.B. 55. 7549-7556 (1997)

[Publications] T.G.Perring: "Antiferromagnetic short range order in a two-dimensional manganite exhibiting giant magnetoresistance" Phys.Rev.Lett.78. 3197-3200 (1997)

[Publications] Y.Okimoto: "Variation of electronic structure in La_<1-x>Sr_xMnO_3(0【less than or equal】x【less than or equal】0.3)as investigated by optical conductivity spectra" Phys.Rev.B. 55. 4206-4214 (1997)

[Publications] Y.Tomioka: "Reentrant transition of the charge-ordered state in perovskite manganites" J.Phys.Soc.Jpn.66. 302-305 (1997)

[Publications] H.Yoshizawa: "Bandwidth-control-induced insulator-metal transition in Pr_<0.65>(Ca_<1-y>Sr_y)_<0.35>MnO_3 and Pr_<0.7>Ca_<0.3>MnO_3" Phys.Rev.B. 55. 2729-2732 (1997)

[Publications] M.Kasai: "Colossal magnetoresistance in Sm_<1-x>Sr_xMnO_3 films" J.Appl.Phys.80. 6894-6897 (1997)

[Publications] E.Pellegrin: "Soft X-ray magnetic circular dichroism study of the colossal magnetoresistance compound La_<1-x>Sr_xMnO_3" J.Elect.Spect.Rel.Pheno.86. 115-118 (1997)

[Publications] K.Maiti: "Electronic Structure of One-dimensional Cuprate Sr_2CuO_3" Europhys.Lett.37. 359-364 (1997)

[Publications] T.Mizokawa: "Photoemission and X-Ray Absorption Study of the Hole-Doped Ladder System La_<1-x>Sr_xCuO_<2.5>" Phys.Rev.B. 55. R13373-R13376 (1997)

[Publications] J.Matsuno: "Photoemission study of metal-insulator transition in CuIr_2S_4" Phys.Rev.B. 55. R15979-R15982 (1997)

[Publications] T.Mizokawa: "Spin,Charge and Orbital Ordering Mn Perovskite Oxides Studied by Model Hartree-Fock Calculations" Phys.Rev.B. 56. R493-R496 (1997)

[Publications] T.Saitoh: "Electronic Structure and Magnetic States in La_<1-x>Sr_xCoO_3 Studied by Photoemission and X-Ray Absorption Spectroscopy" Phys.Rev.B. 56. 1290-1295 (1997)

[Publications] A.Ino: "Chemical-Potential Shift in Overdoped and Underdoped La_<2-x>Sr_xCuO_4" Phys.Rev.Lett.79. 2101-2104 (1997)

[Publications] K.Fujioka: "Electronic Structure of SrRuO_3" Phys.Rev.B. 56. 6380-6383 (1997)

[Publications] T.Saitoh: "Temperature-Dependent Valence-Bnad Photoemission Spectra of La_<1-x>Sr_xMnO_3" Phys.Rev.B. 56. 8836-8840 (1997)

[Publications] T.Mizokawa: "Hartree-Fock Study of Charge-Ordered States in La_<1-x>Sr_xCuO_4 and La_<1-x>Sr_xNiO_4" Phys.Rev.B. 56. 11920-11924 (1997)

[Publications] T.Tsujioka: "Hubbard Splitting and Electron Correlation in the Ferromagnetic Metal CrO_2" Phys.Rev.B. 56. 15509-15512 (1997)

[Publications] E.Z.Kurmaev: "Excitation Energy Dependence of SL_<2,3> X-Ray Fluoresent Emission of BaNiS_2" Phys.Letters A. 235. 191-194 (1997)

[Publications] T.Mizokawa: "Description of Spin and Charge Domain Walls in Doped Perovskite-Type 3d Transition-Metal Oxides based on Superexchange" Phys.Rev.Lett.80. 1320-1323 (1998)

[Publications] A.Fujimori: "Photoemission Spectroscopy of Correlated Transition-Metal Compounds in the Charge-Transfer Regime" Physica B. 237-238. 137-141 (1997)

[Publications] K.Mamiya: "Photoemission Study of Pyrite-Type Transition-Metal Chalcogenides MS_<2-x>Se_x(M=Fe,Co,Ni)" Physica B. 237-238. 390-391 (1997)

[Publications] S.Suga: "High-Resolution Photoemission Study of Nd_<0.5>Sr_<0.5>MnO_3:Temperature Dependence and Resonance Spectra" Physica B. 237-238. 413-414 (1997)

[Publications] K.Ikushima: "Magnetic Properties in the Normal State of LuNi_2B_2C Observed by ^<61>Ni and ^<11>B NMR" J.Phys.Soc.Jpn.66. 1130-1137 (1997)

[Publications] H.Yasuoka: "Pseudo Spin Gap High-Tc Oxides observed by NMR" Hyperfine Interactions. 105. 27-34 (1997)

[Publications] A.Goto: "Phase diagram for the spin pseudogap in LaBa_2Cu_3O_y studied by NMR" Phys.Rev.B. 55. 12736-12741 (1997)

[Publications] N.Fujiwara: "Spin fluctuations in S=1/2 double-linear-chain LiV_2O_5 studied by ^7Li NMR" Phys.Rev.B. 55. 11945-11948 (1997)

[Publications] S.Fujiyama: "Anomalous Spin Excitation in the Metallic State of La_<2-x>Sr_xCuO_4 Observed by Cu NQR" J.Phys.Soc.Jpn.66. 2864-2869 (1997)

[Publications] T.Ohama: "The Orbital Character in the Spin-Peierls System NaV_2O_5" J.Phys.Soc.Jpn.66. 3008-3011 (1997)

[Publications] H.Yasuoka: "Pseudo Spin Gap in High-Tc's Manifested by the NMR Experiments" Physica C. 282-287. 119-122 (1997)

[Publications] M.Takano: "Impurity Effects on a 2-leg Spin Ladder Compound SrCu2O3" Physica C. 282-287. 149-152 (1997)

[Publications] K.Kumagai: "Local Distortions in the BiO_6 Ochtahera Sublattice of BaPb_xBi_<1-x>O_3 as seen by ^<137>Ba NMR/NQR" Physica C. 274. 209-220 (1997)

[Publications] Y.Matsuda: "Interlayer Phase Coherence in the Vortex State of Bi_2Sr_2CaCu_2O_8 Probed by Josephson Plasma Resonance" Phys.Rev.Lett.78. 1972-1975 (1997)

[Publications] K.Kumagai: "NMR Study of Carrier Doping Effects on Spin Gaps in Spin Ladder Sr_<14-x>A_xCu_<24>O_<41>(A=Ca,Y and La)" Phys.Rev.Lett.78. 1992-1995 (1997)

[Publications] Y.Matsuda: "Excitation of Josephson Plasma and Vortex Oscillation Modes in Bi_2Sr_2CaCu_2O_8 in Parallel Magnetic Fields" Phys.Rev.B. 55. R8685-R8688 (1997)

[Publications] Y.Furukawa: "NMR Study of Ferromagnetic YTiO_3 and Antiferromagnetic LaTiO_3" Physica B. 237-238. 156-158 (1997)

[Publications] S.Tsujj: "NMR Study of Metal-Insulator Transition Spinel CuIr_2(S_<1-x>Se_x)_4" Physica B. 237-238. 156-158 (1997)

[Publications] I.Chong: "Growth of Heavily Pb-Substituted Bi-2201 Single Crystals by a Floating Zone Method" Physica C. (1997)

[Publications] Y.Matsuda: "Interlayer Phase Coherence in the Vortex State of Bi_2Sr_2CaCu_2O_8 Proved by Josephson Plasma Resonance" Physica C. 282-287. 391-394 (1997)

[Publications] Y.Furukawa: "^<47/49>Ti and ^<139>La NMR Studies on Mott Transition in La_<1-x>Sr_xTiO_3" Physica C. 282-287. 1103-1104 (1997)

[Publications] Y.Furukawa: "NMR Study on a Metal-Insulator Transition in Oxysulfides(La_<1-x>Ca_xO)Cu_<1-x>Ni_xS" Physica C. 282-287. 1105-1106 (1997)

[Publications] S.Tsuji: "Metal-Insulator Transition in the Spinel CuIr_2(S_<1-x>Se_x)_4 System Studies by NMR" Physica C. 282-287. 1107-1108 (1997)

[Publications] K.Kumagai: "NMR Study of Hole-doping Effect on Spin Gaps in Sr_<14-x>A_xCu_<24>O_<41>(A=Ca,Y,and La)by NMR Studies" Physica C. 282-287. 1343-1344 (1997)

[Publications] A.Yamanaka: "NMR/NQR Stud ies of Hyperfine Field and Electric Field Gradient in RSr_2Cu_2GaO_7,RBa_2Cu_2NbO_8 and(R_<1-x>Ce_x)Sr_2Cu_2MO_<10>" Physica C. 282-287. 1363-1364 (1997)

[Publications] M.Kosugi: "Infuluence of Columner Defects on Interlayer Coherence in Bi_2Sr_2CaCu_2O_8 from Josephson Plasma Resonance" Physica C. 282-287. 2073-2074 (1997)

[Publications] M.B.Gaifulin: "Interlayer Josephson Coupling in the Vortex Solid State of Bi_2Sr_2CaCu_2O_8 from Josephson Plasma Resonance" Physica C. 282-287. 2221-2222 (1997)

[Publications] M.B.Gaifulin: "Collective Electromagneic Wave Excitation in Bi_2Sr_2CaCu_2O_8 in Magnetic Field Nealy Parallel to the CuO_2 Planes" Physica C. 282-287. 2429-2430 (1997)

[Publications] M.Kosugi: "Coupling Transition of the Vortex Liquid in Bi_2Sr_2CaCu_2O_8 with Columnar Defects" Phys.Rev.Lett.79. 3763-3766 (1997)

十倉好紀東京大学, 大学院・工学系研究科, 教授 (30143382)