1997 Fiscal Year Annual Research Report

モット転移近傍の異常金属相-銅酸化物の異常金属相と高温超伝導体-

Research Project

Project/Area Number	07237105
Research Institution	Nagoya University
Principal Investigator	佐藤正俊名古屋大学, 大学院・理学研究科, 教授 (40092225)
Co-Investigator(Kenkyū-buntansha)	藤田敏三広島大学, 理学部, 教授 (20004369) 朝山邦輔大阪大学, 大学院・基礎工学部, 教授 (20029416) 内田慎一東北大学, 大学院・工学研究科, 教授 (10114399) 遠藤康夫東北大学, 大学院・理学研究科, 教授 (00013483) 伊土政幸北海道大学, 大学院・理学研究科, 教授 (90111145)
Keywords	モット転移 / 異常金属相 / 高温超伝導 / スピンギャップ / 強相関電子系
Research Abstract	高温超伝導体の異常金属相は、モット絶縁相にドープされた正孔の濃度pと温度TのT-p平面において、T<T_0(p)(p≦P_0,T_0(p)=0)の限られた領域に存在する。これはHall係数や帯磁率の挙動からわかったことである。このp領域と超伝導の出現する領域との一致がこの相と超伝導相の密接な関係を端的に示すが、特にT_0以下の異常物性が超伝導相におけるものと同じ対称性をもった電子スピン-重項の形成、さらにはそれに伴った擬ギャップ形成によるものであることを示唆するいくつかの実験結果が発表されるに及んで、この相の概容が見えてきた。核磁気共鳴の実験結果から提出されていたいわゆる"スピンギャップ異常"の温度T_<SG>(T_c<T_<SG><T_OとT_Oの関係を含めたこの系の物性の解釈は次のようになる。電子の反強磁性的相関とスピン-重項相関が降温とともにT_O付近からともに成長する。さらにT_<SG>まで温度が降下するとスピン-重項相関が支配的となり"スピンギャップ異常"としてそれが顕在化するが、超伝導が現れるのは量子ゆらぎのためにT_<>まで温度が下がってからである。中性子散乱、核磁気共鳴、角度分解光電子分光、STM/STS等を手段にした、銅酸化物や他の関連物質系に対する本年度の綿密な研究は、上述のような擬ギャップ形成から超伝導出現に至る物理描像をより明快なものにするためのものであった。このような描像は高温超伝導の発現メカニズムが磁気的相互作用によるもので、特にCuスピン間に働く大きな交換相互作用Jがその高いT_cの実現に極めて重要であることをさし示している。その他スピンラダー系超伝導体のスピンギャップ研究や電子ドープ系における超伝導対称性に関する研究等において多くの知見が得られたが、そればかりではなく1次元系のスピン電荷分離現象の直接観測や、遷移金属化合物の金属-絶縁体転移に関する研究等、強相関電子系に対する広い視野からの多彩な研究がなされ、この分野の研究が方向づけられた。

Research Products
(99 results)

All Other

All Publications (99 results)

[Publications] H.Sasaki: "Structural Studies on the Phase Transition of La_3Ni_2O_<6.92> at about 550K" J.Phys.Soc.Jpn.66. 1693-1697 (1997)
[Publications] N.Yamada: "Polarization Analysis of X-Ray Absorption at the O ls Absorption Edge in PrBa:Cu:O_7:Unusurl Electronic Structure in CuO_2 Plane" Physica C. 282-287. 963-964 (1997)
[Publications] H.Kamijo: "Electron and phonon Thermal Conducturty of High-Tc Systems from the Underdoped Insulating to the Nonsupercenducting Metallic Phase" J.Phys.Soc.Jpn.66. 2466-2472 (1997)
[Publications] Y.Kobayashi: "^<51>V-NMR Study of the Misfit Layer Compounds La_<1.17-x>Sr_xVS_<3.17>" J.Phys.Soc.Jpn. 66. 4027-4030 (1997)
[Publications] Y.Yasui: "Phase Diagram and Pressure Effects on Transport Properties of BaCo_<1-x>Ni_xS_2" J.Phys.Soc.Jpn.66. 3194-3201 (1997)
[Publications] S.Taniguchi: "ESR Studies on CaV_4O_9 and CaV_3O_7" J.Phys.Soc.Jpn.66. 3660-3664 (1997)
[Publications] H.Sasaki: "Dynamical Magnetic Properties of BaCo_<1-x>Ni_xS_2 near the Mott Transitions Induced by Pressure and Carrier-Number Control" J.Phys.Soc.Jpn.66. 3975-3980 (1997)
[Publications] E.Z.Kurmaev: "Excitation Energy Dependence of SL_2,3 X-Ray Fluoresent Emission of BaNiS_2 near _<2p> Threshold" Phys.Lett.A.235. 191-194 (1997)
[Publications] K.Kodama: "Spin Gap Behavior of CuNb_2O_6" J.Phys.Soc.Jpn.67. 57-60 (1998)
[Publications] M.Sato: "Metal-Insulator Transitions of BaCo_<1-x>Ni_xS_2 Induced by Pressure and Camer Number Control" The Review of High Pressure Science and Technology. 7(in press). (1998)
[Publications] H.Harashina: "Magnetic Excitation of BaCoS_2 near the Mott Fransitions Induced by Pressure and Carrier-Number Control" The Review of High Pressure Science and Technology. 7(in press). (1998)
[Publications] Y.Yasui: "Pressure Effects on the Mott Metal-Insulator Transitions in BaCo_<1-x>Ni_xS_2" The Review of High Pressure Science and Technology. 7(in press). (1998)
[Publications] A.Fujimori: "Chemical Potential Shifts in Correlated Electron Systems Studied by Photoemission Spectroscopy" J.Electron Spectroscopy and Related Phenomena. (in press).
[Publications] M.Sato: "The Anomalous Metallic Phase and High-T_c Superconductionty of Cu Oxides" Studies of High Temperature Superconductors ed.by A.V..Narlikar. 19. 213-243 (1996)
[Publications] 佐藤正俊: "高温超伝導十年電子物性・超伝導機構実験の立場から" 日本物理学会誌. 52. 174-176 (1997)
[Publications] 佐藤正俊: "高温超伝導:実験はどこまで追ったか" 高温超伝導とフラーレンの科学(第11回大学と科学公開シンポジウム. 31-46 (1997)
[Publications] M.Oda: "Strong pairing interactions in the underdoped region of Bi_2Sr_2CaCu_2O_<8+δ>" Physica C. 281. 135-142 (1997)
[Publications] M.Oda: "STM/STS Studies for doping effects on the symmetry and magnitude of superconducting gap in Bi_2Sr_2CaCu_2O_<8+δ>" Physica C. 282-287. 1499-1500 (1997)
[Publications] C.Manabe: "Atomic Images and Tunneling Spectra on Bi_2Sr_2CaCu_2O_<8+δ> Cleaved Surface by STM" Journal of the Physical Society of Japan. 66. 1776-1784 (1997)
[Publications] M.Oda: "Strong Pairing interaction and pseudogap behavior in underdoped Bi_2Sr_2CaCu_2O_<8+δ>" Journal of Physics and Chemistry of Solids. (in press).
[Publications] N.Momono: "Dependence of superconducting gap on hole doping level in La_<2-x>Sr_xCuO_4" Journal of Physics and Chemistry of Solids. (in press).
[Publications] H.Ding: "Evolution of the Fermi Surface with Carrier Concentration in Bi_2Sr_2CaCu_2O_<8+δ>" Phys.Rev.Lett.78. 2628-2631 (1997)
[Publications] N.Nagasako: "Electronic Band Structure of SrCuO_2" J.Phys.Soc.Jpn.66. 1756-1761 (1997)
[Publications] T.Yokoya: "Angle-Resolved Photoemission Spectroscopy of Non-Cuprato Two Dimensional Perovskite Superconductor Sr_2RuO_4" Physica B. 237-238. 377-379 (1997)
[Publications] T.Takahashi: "Angle-Resolved.photoemission study of Sr_2RuO_4,an Extended van-Hove Singularity in Non-Cuprate Superconductor" Physica C. 282-287. 218-221 (1997)
[Publications] T.Takeuchi: "ARPES Studies of Pb SubstitutedBi2201 Compounds" Physica C. 282-287. 999-1000 (1997)
[Publications] T.Yokoya: "High-Resolution Angle-Resolved Photoemission Study of Sr_<14-x>Ca_xCu_<24>O_<41>(x=0 and 6)" Physica C. 282-297. 997-998 (1997)
[Publications] T.Takahashi: "Angle-Resolied Photoemission Study of Ladder Compound Sr_<14>Cu_<24>O_<41>" Phys.Rev.B. 56. 7870-7873 (1997)
[Publications] O.Akaki: "Unconventional Spectral Changes Across the Metal-Insulator Transition in CeTiO_<3+δ>" Phys.Rev.B. 56. 12050-12053 (1997)
[Publications] M.R.Norman: "Unusual Dispersion and Lineshape of the Superconducting state Spectra of Bi_2Sr_2CaCu_2O_<8+δ>" Phys.Rev.Lett.79. 3506-3509 (1997)
[Publications] H-D Kim: "High-Resolution Photoemission Study of V_<2-y>O_3" Phys.Rev.B. (in press).
[Publications] T.Sato: "Angle-Resolved Photoemission Study of Superconducting Ladder Compound Sr_<14-x>Ca_xCu_<24>O_<41>" J.Phys.Chem.Solids. (in press).
[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. (in press).
[Publications] H.Fujisawa: "Angle Resolved Photoemission Spectroscopy of SrCuO_2;spin-charge Separation?" J.Electron Spectroscopy and Related Phenomena. (in press).
[Publications] M.Hiroi: "Unusual Antiferromagnetic State in Si-doped CuGeO_3 single Crystale Studied by Specific-Heat Measurements in Magnetic Fields" Phys.Rev.B. 55. R6125-R6128 (1997)
[Publications] M.Sera: "Unusual Antiferromagnetic State in the Dimecuzed Phase in CuGe_<1-x>Si_xO_3 Studied by Lattice Distortion" Phys.Rev.B. 56. 14771-14775 (1997)
[Publications] Y.Endoh: "Spin Fluctuations in Highly Corrclated Electrons Probed by Neutron Scattering" Hyperpine Interactions. 104. 23-28 (1997)
[Publications] K.Nakajima: "Neutron Scattering Study of Oxygen Ordering and Magnetic Correlations in La_2NiO_<4.11> and La_2NiO_<4.125>" J.Phys.Soc.Jpn.66. 809-817 (1997)
[Publications] J.A.Fernandez-Baca: "Effect of pressure on the Magnetic Phase Diagram of the Antiferromagnetic Spin Density Wave Alloy Cr-1.6% Si" J.Appl.Phys.81. (1997)
[Publications] Y.Endoh: "Polarized Neutron Studies for Cr Excitations" J.Phys.Soc.Jpn.66. 1615-1617 (1997)
[Publications] T.Fukuda: "Dynamical Susceptibility of the SDW State in Cr" Physica B. 237-238. 430-431 (1997)
[Publications] H.Hiraka: "Spin Dynamics in a Metallic Ferromagnet CoS_2" Physica B. 237-238. 478-479 (1997)
[Publications] T.Endoh: "Scaling of Spin-Wave Stiffness Constant to Curie Temperature in the Colossal Magnetoresistance Material La_<1-x>Sr_xMnO_3" J.Phys.Soc.Jpn.66. 2264-2267 (1997)
[Publications] Y.Endoh: "Phase Separation,Staging and Spin Fluctuations in La_2CuO_<4+y>" Physica C. 282-287. 170-173 (1997)
[Publications] K.Yamada: "Low Frequency Spin Fluctuations in the Superconducting La_<2-x>Sr_xCuO_4" Physica C. 282-287. 85-88 (1997)
[Publications] K.Kojima: "Reduction of Ordered Moment and Neil Temperature of Quasi One Dimensional Antiferromagnet Sr_2CuO_3 and Ca_2CuO_3" Phys.Rev.Lett.78. 1787-1790 (1997)
[Publications] B.O.Wells: "Structures and Incommensurate Spin Fluctuations in Oxygen-Doped La_2CuO_<4+y> High Temperature Superconductors" Science. 277. 1067- (1997)
[Publications] K.Iwasa: "Thermoelectric Power of Delafossite-Derived Compounds,RCuO_<2+δ>(R=Y,La,Pr,Nd,Sm and Eu)" Phys.Rev.B. (in press).
[Publications] E.Torikai: "Probing Interaction of Paramagnetic Electron with Conduction Electrons in High-Tc Superconductor LaSrCuO by μ-on Spin Relaxation" Hyperfine Interaction. 105. 175-179 (1997)
[Publications] T.Suzuki: "Observation of Modulated-Magnetic Long-Range Order in La_<1.88>Sr_<0.12>CuO_4" Phys.Rev.B. (in press).
[Publications] R.J.Birgeneau: "Structures and Incommensurate Spin Excitations in Excess Oxygen-Doped La_2CuO_<4+y>" Physica B. 237-238. 84-90 (1997)
[Publications] K.Yamada: "Neutron Scattering Study of Low Energy Spin Fluctuations in La_<2-x>Sr_xCuO_4" J.Supercond. 10. 343-347 (1997)
[Publications] K.Hirota: "Quasi-Elactic Incommensurate Peaks in La_<2-x>Sr_xCu_<1-y>ZnyO_<4-δ>" Proc.Int.Conf.on Neutron Scattering. (in press).
[Publications] S.Wakimoto: "Two-Dimensional Antiferromagnetic Correlations in the Oxygen-Doped 2-1-4 Type Cuprates" Physica B. 237-238. 91-92 (1997)
[Publications] M.Matsuda: "Surft Heavyion irradiation Effects on the Single Crystal La_<1.85>Sr_<0.15>CuO_4" Physica Scripta. 73. 340-342 (1997)
[Publications] M.Fujita: "Study on Quantum Magnetic Excitation of CuGeO_3 Using Pulsed Ncutlon Scattering" Physica B. 237-238. 132-134 (1997)
[Publications] M.Arai: "Dynamic Structure Factor of Non-Crystalline and Crystalline Systems as revealed by MARI,a Neutron Chopper Instrument" Advances in Colloid and Interface Science. 71-72. 209-232 (1997)
[Publications] 新井正敏: "パルス中性子散乱による物質の研究" Isotope News. 521. 2-7 (1997)
[Publications] M.Arai: "High-Energy T-O-F Neutron Spectroscopy on Quantunr Spin Systems" Physica B. 237-238. 127-131 (1997)
[Publications] A.Ino: "Chemical Potential Shift in Overdoped and Underdoped La_<2-x>Sr_2CuO_4" Phys.Rev.Lett.79. 2101-2104 (1997)
[Publications] R.Henn: "Dynamics of the c-axis polarized infrared-active modes in La_<2-x>Sr_xCuO_4" Phys.Rev.B. 56. 6295-6301 (1997)
[Publications] K.Takenaka: "In-plane thermal conduchvity and Lorenz number in YBa_2Cu_3O_<7-y>" Phys.Rev.B. 56. 5654-5661 (1997)
[Publications] J.E.Ostenson: "Flux expulsion and reversible magnetization in the stripe phase Superconductor" Phys.Rev.B. 56. 2820-2823 (1997)
[Publications] J.M.Harris: "Measurement of an Anisotropic Gap in Single Plane Bi_2Sr_<2-x>Ca_xCuO_<6+δ>" Phys.Rev.Lett.79. 143-146 (1997)
[Publications] S.Uchida: "Optical conductivity studies of high-Tc Superconductors" Hyperfine Interactions. 105. 47-59 (1997)
[Publications] T.Boske: "High-Resolution x-ray-photoemission study of Sr_2CuO_2Cl_2" Phys.Rev.B. 56. 3438-3446 (1997)
[Publications] M.Takigawa: "Field-induced staggered magnetization near impurities in Sr_2CuO_3" Phys.Rev.B. 55. 14129-14132 (1997)
[Publications] M.Knupfer: "Site-Specific unoccupied electronic structure of SrCuO_2" Phys.Rev.B. 55. R7291-7294 (1997)
[Publications] T.Osafunc: "Optical Study of the Sr_<14-x>Ca_xCu_<24>O_<41> System" Phys.Rev.Lett.78. 1980-1983 (1997)
[Publications] N.Motoyama: "Effect of Ca substiturisn and pressure on the transport of Sr_<14>Cu_<24>O_<41>" Phys.Rev.B. 55. R3386-3389 (1997)
[Publications] M.Takigawa: "Spin and charge dynamics in the hole-dsped 1D-chain-ladder composite" Phys.Rev.B. 57. 1124-1140 (1998)
[Publications] S.Uchida: "Josephson plasma in the c-aris optical spectrum of high-Tc Superconductors" Physica C. 293. 1-7 (1997)
[Publications] C.Kim: "Separation of spin and charge excitations in one-dimensional SrCuO_2" Phys.Rev.B. 56. 15589-15595 (1997)
[Publications] M.Matsuda: "Magnetic excitations and structural change in Sr_<14-x>Ca_xCu_<24>O_<41>" Phys.Rev.B. 56. 14499-14504 (1997)
[Publications] S.Uchida: "Spin gap effects on the c-axis and in-plane charge clynamics of high-Tc cupsates" Physica C. 282-287. 12-18 (1997)
[Publications] N.Mori: "Pressure-induced superconductivity in quantum spin-ladder compound" Physica B. 239. 137-140 (1997)
[Publications] 上原政智、秋光純: "梯子格子の超伝導体" 日本物理学会誌. 52. 22-25 (1997)
[Publications] N.Ogita et al.: "Raman Scattering Investigation of Y_2BaNiO_3" J.Phys.Soc.Jpn.3. 873-876 (1997)
[Publications] T.Yokoo et al.: "Ni-chain gap excitations in (Nd_xY_<1-x>)_2BaNiO_5: 1D to 3-D crossover" Phys.Rev.B. 55. 11516-11520 (1997)
[Publications] M.Hidaka et al.: "Re-examination of the room temperature crystal structure of CuGeO_3by X-ray dictraction experiments" J.Phys.: Condents Matter. 9. 809-824 (1997)
[Publications] Y.Yamamoto et al.: "The Observation of g-shifts in Spin-Peierls Matcrial CuGeO_3 by submillimeter Wace ESR" J.Phys.Soc.Jpn.4. 1115-1123 (1997)
[Publications] K.Motoya et al.: "Magnetic Property of CeNiC_2Studied by Macroscopic and Microscopic Measurements" J.Phys.Soc.Jpn.66. 1124-1129 (1997)
[Publications] H.Nojiri et al.: "Magnetic phase diagram and antiferromagnetic resonance in CuGe_<1-y>Si_yO_3" J.Phys. : Condens Matter. 9. 1331-1338 (1997)
[Publications] 秋光純: "新しい高温超伝導体をデザインする" 第11回「大学と科学」公開シンポジウム. (1997)
[Publications] H.Takahashi et al.: "Superconductivity in quantum spin-ladder compound Ca_<13.6>Sr_<0.4>Cu_<24>O_<41+δ>" Physica B. 237-238. 112-114 (1997)
[Publications] K.Magishi et al.: "^<63>Cu NMR study on spin ladder compounds Sr_<14-x>Ca_xCu_<24>O_<41>(x=9,11.5)" Phyica C. 282-287. 1115-1116 (1997)
[Publications] A.Yamashita et al.: "Anomalous Field Dependence of Magnetic Penetration Depth in the Volyro State of CcRu _2Probed by Muon Spin Rotation" Phys.Rev.Lett.79. 3771-3774 (1997)
[Publications] T.Nagata et al.: "Superconductivity in the ladder compound Sr_<2.5>Ca_<11.5>Cu_<24>O_<41>" Physica C. 282-287. 153-156 (1997)
[Publications] T.Tsuboi: "Nature of the vortex liquid in Bi_2Sr_2CaCu_2O_y" Phys.Rev.B. 55. R8709-R8712
[Publications] H.Kitano: "Anisotropic quasiparticle conductivity in the superconducting state of high-T_e cuprates in microwave region" "proceedings of the 7th International Symposium on Superconductivity"Sapporo,Japan,October 30‐November 2,1996(Springe‐Verlag,Tokyo,1997). 127-130
[Publications] T.Hanaguri: "Effects of columnar defects on the Josephson plasma resonance in Bi_2Sr_2CaCu_2O_y" Phys.Rev.Lett.78. 3177-3180
[Publications] T.Tsuboi: "The static and dynamic properties of the vortices in Bi_2Sr_2CaCu_2O_y" Physica C. 282-287. 1303-1304
[Publications] H.Kitano: "Out of plane microwave conductivity of the cuprates in the superdonducting state" Physica C. 282-287. 1125-1126
[Publications] T.Hanaguri: "Josephson plasma resonance in the mixed state of Bi_2Sr_2CaCu_2O_y containing columnar defects" Physica C. 282-287. 2375-2376
[Publications] X.M.Wang: "Dielectric response of the sliding SDW in (TMTSF)_2A_3F_6" Solid State Commun.(in press).
[Publications] Y.Tsuchiya: "Josephson plasma resonance in the mixed state of heavy‐ion irradiated Bi_2Sr_2CaCu_2O_y" Physica C. 293. 254-258
[Publications] A.Maeda: "Phase correlation investigated by the Josephson plasma resonance in Bi_2(Sr,La)_2CuO_y" Physica C. 293. 143-148
[Publications] Y.Tsuchiya: "Effects of heavy‐ion irradiation on the Josephson plasma resonance in the mixed state of Bi_2Sr_2CaCu_2O_y" "Proceedings of the 8th International Symposimu on Superconductivity"Gifu,Japan,October 27‐30,1997(Springer‐Verlag,Tokyo,1998). in press
[Publications] M.Goto: "Anisotropic transport properties of PrBa_2Cu_3O_7" Physica. C282-287. 1133-1134 (1997)

1997 Fiscal Year Annual Research Report

モット転移近傍の異常金属相-銅酸化物の異常金属相と高温超伝導体-

Principal Investigator

佐藤 正俊 名古屋大学, 大学院・理学研究科, 教授 (40092225)

Research Products

[Publications] H.Sasaki: "Structural Studies on the Phase Transition of La_3Ni_2O_<6.92> at about 550K" J.Phys.Soc.Jpn.66. 1693-1697 (1997)

[Publications] N.Yamada: "Polarization Analysis of X-Ray Absorption at the O ls Absorption Edge in PrBa:Cu:O_7:Unusurl Electronic Structure in CuO_2 Plane" Physica C. 282-287. 963-964 (1997)

[Publications] H.Kamijo: "Electron and phonon Thermal Conducturty of High-Tc Systems from the Underdoped Insulating to the Nonsupercenducting Metallic Phase" J.Phys.Soc.Jpn.66. 2466-2472 (1997)

[Publications] Y.Kobayashi: "^<51>V-NMR Study of the Misfit Layer Compounds La_<1.17-x>Sr_xVS_<3.17>" J.Phys.Soc.Jpn. 66. 4027-4030 (1997)

[Publications] Y.Yasui: "Phase Diagram and Pressure Effects on Transport Properties of BaCo_<1-x>Ni_xS_2" J.Phys.Soc.Jpn.66. 3194-3201 (1997)

[Publications] S.Taniguchi: "ESR Studies on CaV_4O_9 and CaV_3O_7" J.Phys.Soc.Jpn.66. 3660-3664 (1997)

[Publications] H.Sasaki: "Dynamical Magnetic Properties of BaCo_<1-x>Ni_xS_2 near the Mott Transitions Induced by Pressure and Carrier-Number Control" J.Phys.Soc.Jpn.66. 3975-3980 (1997)

[Publications] E.Z.Kurmaev: "Excitation Energy Dependence of SL_2,3 X-Ray Fluoresent Emission of BaNiS_2 near _<2p> Threshold" Phys.Lett.A.235. 191-194 (1997)

[Publications] K.Kodama: "Spin Gap Behavior of CuNb_2O_6" J.Phys.Soc.Jpn.67. 57-60 (1998)

[Publications] M.Sato: "Metal-Insulator Transitions of BaCo_<1-x>Ni_xS_2 Induced by Pressure and Camer Number Control" The Review of High Pressure Science and Technology. 7(in press). (1998)

[Publications] H.Harashina: "Magnetic Excitation of BaCoS_2 near the Mott Fransitions Induced by Pressure and Carrier-Number Control" The Review of High Pressure Science and Technology. 7(in press). (1998)

[Publications] Y.Yasui: "Pressure Effects on the Mott Metal-Insulator Transitions in BaCo_<1-x>Ni_xS_2" The Review of High Pressure Science and Technology. 7(in press). (1998)

[Publications] A.Fujimori: "Chemical Potential Shifts in Correlated Electron Systems Studied by Photoemission Spectroscopy" J.Electron Spectroscopy and Related Phenomena. (in press).

[Publications] M.Sato: "The Anomalous Metallic Phase and High-T_c Superconductionty of Cu Oxides" Studies of High Temperature Superconductors ed.by A.V..Narlikar. 19. 213-243 (1996)

[Publications] 佐藤 正俊: "高温超伝導十年 電子物性・超伝導機構 実験の立場から" 日本物理学会誌. 52. 174-176 (1997)

[Publications] 佐藤 正俊: "高温超伝導:実験はどこまで追ったか" 高温超伝導とフラーレンの科学(第11回大学と科学公開シンポジウム. 31-46 (1997)

[Publications] M.Oda: "Strong pairing interactions in the underdoped region of Bi_2Sr_2CaCu_2O_<8+δ>" Physica C. 281. 135-142 (1997)

[Publications] M.Oda: "STM/STS Studies for doping effects on the symmetry and magnitude of superconducting gap in Bi_2Sr_2CaCu_2O_<8+δ>" Physica C. 282-287. 1499-1500 (1997)

[Publications] C.Manabe: "Atomic Images and Tunneling Spectra on Bi_2Sr_2CaCu_2O_<8+δ> Cleaved Surface by STM" Journal of the Physical Society of Japan. 66. 1776-1784 (1997)

[Publications] M.Oda: "Strong Pairing interaction and pseudogap behavior in underdoped Bi_2Sr_2CaCu_2O_<8+δ>" Journal of Physics and Chemistry of Solids. (in press).

[Publications] N.Momono: "Dependence of superconducting gap on hole doping level in La_<2-x>Sr_xCuO_4" Journal of Physics and Chemistry of Solids. (in press).

[Publications] H.Ding: "Evolution of the Fermi Surface with Carrier Concentration in Bi_2Sr_2CaCu_2O_<8+δ>" Phys.Rev.Lett.78. 2628-2631 (1997)

[Publications] N.Nagasako: "Electronic Band Structure of SrCuO_2" J.Phys.Soc.Jpn.66. 1756-1761 (1997)

[Publications] T.Yokoya: "Angle-Resolved Photoemission Spectroscopy of Non-Cuprato Two Dimensional Perovskite Superconductor Sr_2RuO_4" Physica B. 237-238. 377-379 (1997)

[Publications] T.Takahashi: "Angle-Resolved.photoemission study of Sr_2RuO_4,an Extended van-Hove Singularity in Non-Cuprate Superconductor" Physica C. 282-287. 218-221 (1997)

[Publications] T.Takeuchi: "ARPES Studies of Pb SubstitutedBi2201 Compounds" Physica C. 282-287. 999-1000 (1997)

[Publications] T.Yokoya: "High-Resolution Angle-Resolved Photoemission Study of Sr_<14-x>Ca_xCu_<24>O_<41>(x=0 and 6)" Physica C. 282-297. 997-998 (1997)

[Publications] T.Takahashi: "Angle-Resolied Photoemission Study of Ladder Compound Sr_<14>Cu_<24>O_<41>" Phys.Rev.B. 56. 7870-7873 (1997)

[Publications] O.Akaki: "Unconventional Spectral Changes Across the Metal-Insulator Transition in CeTiO_<3+δ>" Phys.Rev.B. 56. 12050-12053 (1997)

[Publications] M.R.Norman: "Unusual Dispersion and Lineshape of the Superconducting state Spectra of Bi_2Sr_2CaCu_2O_<8+δ>" Phys.Rev.Lett.79. 3506-3509 (1997)

[Publications] H-D Kim: "High-Resolution Photoemission Study of V_<2-y>O_3" Phys.Rev.B. (in press).

[Publications] T.Sato: "Angle-Resolved Photoemission Study of Superconducting Ladder Compound Sr_<14-x>Ca_xCu_<24>O_<41>" J.Phys.Chem.Solids. (in press).

[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. (in press).

[Publications] H.Fujisawa: "Angle Resolved Photoemission Spectroscopy of SrCuO_2;spin-charge Separation?" J.Electron Spectroscopy and Related Phenomena. (in press).

[Publications] M.Hiroi: "Unusual Antiferromagnetic State in Si-doped CuGeO_3 single Crystale Studied by Specific-Heat Measurements in Magnetic Fields" Phys.Rev.B. 55. R6125-R6128 (1997)

[Publications] M.Sera: "Unusual Antiferromagnetic State in the Dimecuzed Phase in CuGe_<1-x>Si_xO_3 Studied by Lattice Distortion" Phys.Rev.B. 56. 14771-14775 (1997)

[Publications] Y.Endoh: "Spin Fluctuations in Highly Corrclated Electrons Probed by Neutron Scattering" Hyperpine Interactions. 104. 23-28 (1997)

[Publications] K.Nakajima: "Neutron Scattering Study of Oxygen Ordering and Magnetic Correlations in La_2NiO_<4.11> and La_2NiO_<4.125>" J.Phys.Soc.Jpn.66. 809-817 (1997)

[Publications] J.A.Fernandez-Baca: "Effect of pressure on the Magnetic Phase Diagram of the Antiferromagnetic Spin Density Wave Alloy Cr-1.6% Si" J.Appl.Phys.81. (1997)

[Publications] Y.Endoh: "Polarized Neutron Studies for Cr Excitations" J.Phys.Soc.Jpn.66. 1615-1617 (1997)

[Publications] T.Fukuda: "Dynamical Susceptibility of the SDW State in Cr" Physica B. 237-238. 430-431 (1997)

[Publications] H.Hiraka: "Spin Dynamics in a Metallic Ferromagnet CoS_2" Physica B. 237-238. 478-479 (1997)

[Publications] T.Endoh: "Scaling of Spin-Wave Stiffness Constant to Curie Temperature in the Colossal Magnetoresistance Material La_<1-x>Sr_xMnO_3" J.Phys.Soc.Jpn.66. 2264-2267 (1997)

[Publications] Y.Endoh: "Phase Separation,Staging and Spin Fluctuations in La_2CuO_<4+y>" Physica C. 282-287. 170-173 (1997)

[Publications] K.Yamada: "Low Frequency Spin Fluctuations in the Superconducting La_<2-x>Sr_xCuO_4" Physica C. 282-287. 85-88 (1997)

[Publications] K.Kojima: "Reduction of Ordered Moment and Neil Temperature of Quasi One Dimensional Antiferromagnet Sr_2CuO_3 and Ca_2CuO_3" Phys.Rev.Lett.78. 1787-1790 (1997)

[Publications] B.O.Wells: "Structures and Incommensurate Spin Fluctuations in Oxygen-Doped La_2CuO_<4+y> High Temperature Superconductors" Science. 277. 1067- (1997)

[Publications] K.Iwasa: "Thermoelectric Power of Delafossite-Derived Compounds,RCuO_<2+δ>(R=Y,La,Pr,Nd,Sm and Eu)" Phys.Rev.B. (in press).

[Publications] E.Torikai: "Probing Interaction of Paramagnetic Electron with Conduction Electrons in High-Tc Superconductor LaSrCuO by μ-on Spin Relaxation" Hyperfine Interaction. 105. 175-179 (1997)

[Publications] T.Suzuki: "Observation of Modulated-Magnetic Long-Range Order in La_<1.88>Sr_<0.12>CuO_4" Phys.Rev.B. (in press).

[Publications] R.J.Birgeneau: "Structures and Incommensurate Spin Excitations in Excess Oxygen-Doped La_2CuO_<4+y>" Physica B. 237-238. 84-90 (1997)

[Publications] K.Yamada: "Neutron Scattering Study of Low Energy Spin Fluctuations in La_<2-x>Sr_xCuO_4" J.Supercond. 10. 343-347 (1997)

[Publications] K.Hirota: "Quasi-Elactic Incommensurate Peaks in La_<2-x>Sr_xCu_<1-y>ZnyO_<4-δ>" Proc.Int.Conf.on Neutron Scattering. (in press).

[Publications] S.Wakimoto: "Two-Dimensional Antiferromagnetic Correlations in the Oxygen-Doped 2-1-4 Type Cuprates" Physica B. 237-238. 91-92 (1997)

[Publications] M.Matsuda: "Surft Heavyion irradiation Effects on the Single Crystal La_<1.85>Sr_<0.15>CuO_4" Physica Scripta. 73. 340-342 (1997)

[Publications] M.Fujita: "Study on Quantum Magnetic Excitation of CuGeO_3 Using Pulsed Ncutlon Scattering" Physica B. 237-238. 132-134 (1997)

[Publications] M.Arai: "Dynamic Structure Factor of Non-Crystalline and Crystalline Systems as revealed by MARI,a Neutron Chopper Instrument" Advances in Colloid and Interface Science. 71-72. 209-232 (1997)

[Publications] 新井 正敏: "パルス中性子散乱による物質の研究" Isotope News. 521. 2-7 (1997)

[Publications] M.Arai: "High-Energy T-O-F Neutron Spectroscopy on Quantunr Spin Systems" Physica B. 237-238. 127-131 (1997)

[Publications] A.Ino: "Chemical Potential Shift in Overdoped and Underdoped La_<2-x>Sr_2CuO_4" Phys.Rev.Lett.79. 2101-2104 (1997)

[Publications] R.Henn: "Dynamics of the c-axis polarized infrared-active modes in La_<2-x>Sr_xCuO_4" Phys.Rev.B. 56. 6295-6301 (1997)

[Publications] K.Takenaka: "In-plane thermal conduchvity and Lorenz number in YBa_2Cu_3O_<7-y>" Phys.Rev.B. 56. 5654-5661 (1997)

[Publications] J.E.Ostenson: "Flux expulsion and reversible magnetization in the stripe phase Superconductor" Phys.Rev.B. 56. 2820-2823 (1997)

[Publications] J.M.Harris: "Measurement of an Anisotropic Gap in Single Plane Bi_2Sr_<2-x>Ca_xCuO_<6+δ>" Phys.Rev.Lett.79. 143-146 (1997)

[Publications] S.Uchida: "Optical conductivity studies of high-Tc Superconductors" Hyperfine Interactions. 105. 47-59 (1997)

[Publications] T.Boske: "High-Resolution x-ray-photoemission study of Sr_2CuO_2Cl_2" Phys.Rev.B. 56. 3438-3446 (1997)

[Publications] M.Takigawa: "Field-induced staggered magnetization near impurities in Sr_2CuO_3" Phys.Rev.B. 55. 14129-14132 (1997)

[Publications] M.Knupfer: "Site-Specific unoccupied electronic structure of SrCuO_2" Phys.Rev.B. 55. R7291-7294 (1997)

[Publications] T.Osafunc: "Optical Study of the Sr_<14-x>Ca_xCu_<24>O_<41> System" Phys.Rev.Lett.78. 1980-1983 (1997)

[Publications] N.Motoyama: "Effect of Ca substiturisn and pressure on the transport of Sr_<14>Cu_<24>O_<41>" Phys.Rev.B. 55. R3386-3389 (1997)

[Publications] M.Takigawa: "Spin and charge dynamics in the hole-dsped 1D-chain-ladder composite" Phys.Rev.B. 57. 1124-1140 (1998)

[Publications] S.Uchida: "Josephson plasma in the c-aris optical spectrum of high-Tc Superconductors" Physica C. 293. 1-7 (1997)

[Publications] C.Kim: "Separation of spin and charge excitations in one-dimensional SrCuO_2" Phys.Rev.B. 56. 15589-15595 (1997)

[Publications] M.Matsuda: "Magnetic excitations and structural change in Sr_<14-x>Ca_xCu_<24>O_<41>" Phys.Rev.B. 56. 14499-14504 (1997)

[Publications] S.Uchida: "Spin gap effects on the c-axis and in-plane charge clynamics of high-Tc cupsates" Physica C. 282-287. 12-18 (1997)

佐藤正俊名古屋大学, 大学院・理学研究科, 教授 (40092225)

[Publications] 佐藤正俊: "高温超伝導十年電子物性・超伝導機構実験の立場から" 日本物理学会誌. 52. 174-176 (1997)

[Publications] 佐藤正俊: "高温超伝導:実験はどこまで追ったか" 高温超伝導とフラーレンの科学(第11回大学と科学公開シンポジウム. 31-46 (1997)

[Publications] 新井正敏: "パルス中性子散乱による物質の研究" Isotope News. 521. 2-7 (1997)

[Publications] 上原政智、秋光純: "梯子格子の超伝導体" 日本物理学会誌. 52. 22-25 (1997)

[Publications] 秋光純: "新しい高温超伝導体をデザインする" 第11回「大学と科学」公開シンポジウム. (1997)