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新奇な量子流体の物質探索と相制御

Research Project

Project/Area Number 12046221
Research Category

Grant-in-Aid for Scientific Research on Priority Areas

Allocation TypeSingle-year Grants
Review Section Science and Engineering
Research InstitutionThe University of Tokyo

Principal Investigator

高木 英典  東京大学, 大学院・新領域創成科学研究科, 教授 (40187935)

Co-Investigator(Kenkyū-buntansha) 廣井 善二 (広井 善二)  東京大学, 物性研究所, 教授 (30192719)
上田 寛  東京大学, 物性研究所, 教授 (20127054)
菅野 了次  東京工業大学, 大学院・総合理工学研究科, 教授 (90135426)
Project Period (FY) 2000 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥60,200,000 (Direct Cost: ¥60,200,000)
Fiscal Year 2003: ¥8,200,000 (Direct Cost: ¥8,200,000)
Fiscal Year 2002: ¥17,100,000 (Direct Cost: ¥17,100,000)
Fiscal Year 2001: ¥15,500,000 (Direct Cost: ¥15,500,000)
Fiscal Year 2000: ¥19,400,000 (Direct Cost: ¥19,400,000)
Keywords超伝導 / 幾何学的フラストレーション / パイロクロア格子 / 光キャリアドーピング / 電荷秩序 / 熱電材料 / 超巨大磁気抵抗 / 相競合 / 物質開拓 / 遷移金属酸化物 / 三次元フラストレーション系 / 量子磁性 / 新超伝導体 / 量子磁性体 / 酸化物 / Cd_2Rr_2O_7 / Na_<0.33>V_2O_5 / AlV_2O_4 / MgTi_2O_4 / 強相関電子系 / 低次元性 / 金属-絶縁体転移 / 電荷整列
Research Abstract

新物質開発では、新しいパイロクロア超伝導体KOs_2O_6を発見した。エキゾチック超伝導の可能性が意識され話題を呼んでいる。舞台となるパイロクロア格子は幾何学的フラストレーションの極めて強い格子系として知られている。フラストレーションによって長距離秩序生成が妨げられた結果生じるスピンや電荷の液体状態形成が、超伝導発現に何らかの役割を果たしているのか、今後の展開に期待する。その他にも新しい水を含む層状カルコゲナイド超伝導体や新規三角格子Rh酸化物の熱電材料の開発などの新物質が次々と発見された。
新しい物性開拓の手法として、界面を用いた光キャリアドーピングの手法を提唱した。TiO_2やSrTiO_3など還元性の強い物質と様々な物質の界面を作製し、これに紫外光を照射することで界面での光電荷の移動を生じさせ、これによって界面付近にキャリアを注入する。高温超伝導体やMn酸化物などにおいて、キャリア注入を示す電気抵抗の急激な変化を見出した。化学的手法によるドーピングが困難な系の金属化の新しい手法として更なる展開を図る予定である。
フラストレーションの強いスピネル酸化物の物質開拓を行い、電荷秩序状態の相制御をAlV_2O_4を舞台に展開したほか、新しい競合相互作用系としてGeNi_2O_4を見出し、複雑な逐次相転移を明らかにした。また、相競合の結果超巨大磁気抵抗を生み出すマンガンペロブスカイト酸化物において陽イオンの秩序化を巧妙に制御することにより、乱れと相競合の関係を実験的に明らかにした。

Report

(4 results)
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • 2000 Annual Research Report

Research Products

(71 results)

All Other

All Publications (71 results)

  • [Publications] K.Matsuno, H.Takagi et al.: "Charge ordering and spin frustration in AlV_<2-x>Cr_xO4"PHYS.REV.LETT.. 90(9). 096404 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Y.Kohsaka, T.Sasagawa, H.Takagi et al.: "Angle-resolved photoemission spectroscopy of (Ca, Na)_2CuO_2Cl_2 crystals : Fingerprints of a magnetic insulator in a heavily underdoped superconductor"J.PHYS.SOC.JPN.. 72(5). 1018-1021 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] F.Ronning, H.Takagi et al.: "Evolution of a metal to insulator transition in Ca_<2-x>Na_xCuO_2Cl_2 as seen by angle-resolved photoemission"PHYS.REV.B. 67(16). 165101 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Hawthorn DG, H.Takagi et al.: "Field-induced thermal metal-to-insulator transition in underdoped La_<2-x>Sr_xCuO_<4+δ> a"PHYS.REV.LETT.. 90(19). 197004 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Kenzelmann, H.Takagi et al.: "Structure of end states for a haldane spin chain"PHYS.REV.LETT.. 90(8). 087202 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] A.Koda, H.Takagi et al.: "Spin fluctuation in LiV_2O_4 studied by muon spin relaxation"PHYSICAL REVIEW B. 69(1). 012402 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Nakajima, Y.Ueda et al.: "Ground State Properties of the A-site Ordered Manganites, RBaMn_2O_6 (R=La, Pr and Nd)"Journal of Physical Society of Japan. 72. 3237-3242 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] C.Presura, Y.Ueda et al.: "Charge-Ordering Signatures in the Optical Properties of β-Na_<0.33>V_2O_5"Physical Review Letters. 90. 026402-1-026402-4 (2003)

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      2003 Annual Research Report
  • [Publications] Y.Muraoka, Z.Hiroi: "Photocarrier Injection to Transition Metal Oxides"Journal of Physical Society of Japan. 72. 781-784 (2003)

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      2003 Annual Research Report
  • [Publications] S.Yonezawa, Z.Hiroi et al.: "Superconductivity in a pyrochlore-related oxide KO_s2O_6"J.Phys.:Condens.Matter. 16. L9-L12 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Z.Hiroi et al.: "Correlations and Semimetallic Behaviors in Pyrochlore Oxide Cd_2Re_2O_7"J.Phys.Soc.Jpn.. 72(1). 21-24 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Z.Hiroi et al.: "Ferromagnetic Ising Spin Chains Emerging from the Spin Ice under Magnetic Field"J.Phys.Soc.Jpn.. 72(12). 3045-3048 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] J.Yamaura, Z.Hiroi et al.: "Ultraviolet light selective photodiode based on an organic-inorganic heterostructure"Appl.Phys.Lett.. 83(11). 2097-2099 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Z.Hiroi et al.: "Specific heat of Kagome ice in the pyrochlore oxide Dy_2Ti_2O_7"J.Phys.Soc.Jpn.. 72(2). 411-418 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Nakajima, H.Kageyama, Y.Ueda: "Successive phase transitions in a metal-ordered manganite perovskite YBaMn_2O_4"J.Phys.Chem.Solids. 63. 913-916 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Y.Ueda, M.Isobe, T.Yamauchi: "Superconductivity under high pressure in β(β')-vanadium bronzes"J.Phys.Chem.Solids. 63. 951-955 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Yamauchi, Y.Ueda, N.Mori: "Pressure-Induced Superconductivity in β-Na_<0.33>V_2O_5 beyond Charge Ordering"Phys.Rev.Lett.. 89. 57002-1-57002-4 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Isobe, Y.Ueda: "Observation of Phase Transition from Metal to Spin-Singlet Insulator in MgTi_2O_4 with S=1/2 Pyrochlore Lattice"J.Phys.Soc.Jpn.. 71. 1848-1851 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Nakajima, Y.Ueda: "Structures and Electromagnetic Properties of New Metal-Ordered Manganite s : RBaMn_2O_6 (R=Y and Rare-Earth Elements)"J.Phys.Soc.Jpn.. 71. 2843-2846 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Z.Hiroi, T.Yamauchi, T.Yamada, H.Hanawa, Y.Ohishi, O.Shinomura, H.Abliz, H.Hedo, Y.Uwatoko: "High-pressure study on the superconducting pyrochlore oxide Cd_2Re_2O_7"J.Phys.Chem.Solids. 71・6. 1553-1557 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Z.Hiroi, J.Yamaura, Y.Muraoka, M.Hanawa: "Second phase transition in pyrochlore oxide Cd_2Re_2O_7"J.Phys.Soc.Jpn. 71・7. 1634-1636 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Z.Hiroi, K.Matsuhira, S.Takagi, T.Tayaua, T.Sakakibara: "Specific heat of Kagome ice in the pyrochlore oxide Dy_2Ti_2O_7"J.Phys.Soc.Jpn. 72・2. 411-418 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] Ueda H, Nohara M, Kitazawa K, Takagi H, Fujinori A, Hizokawa T, Yagi T: "Copper pyrites CuS2 and CuSe2 as anion conductors"PHYSICAL REVIEW B. 65:(15). 115104 (2002)

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      2002 Annual Research Report
  • [Publications] Hiroaki Ueda, Koichii Kitazawa, Hidenori Takagi, Takehiko Matsumoto: "Strong Carrier Concentration Dependence of Pressure Effect on Bipolaronic Transitions in Magneli Phase Ti_nO_<2n-1> (n=4,5,6)"J.Phys.Soc.Jpn. Vol.71,No.6. 1506-1510 (2002)

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      2002 Annual Research Report
  • [Publications] C.Ulrich, S.Kondo, M.Reehuis, H.He, C.Bernhard, C.Niedermayer, F.Bouree, P.Bourges, M.Ohl, H.M.Ronnow, H.Takagi, B.Keimer: "Structural and magnetic instabilities of La_<2-x>Sr_xCaCu_2O_6"Phys.Rev.B. 65. 220507-1-220507-4 (2002)

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      2002 Annual Research Report
  • [Publications] Lake B, Ronnow HM, Christensen NB, Aeppli G, Lefmann K, McMorrow DF, Vorderwisch P, Smeibidl P, Mangkorntong N, Sasagawa T, Nohara M, Takagi H, Mason TE: "Antiferromagnetic order induced by an applied magnetic field in a high-temperature superconductor"NATURE. 415. 299-302 (2002)

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      2002 Annual Research Report
  • [Publications] Taniguchi K, Katsufuji T, Sakai F, Ueda H, Kitazawa K, Takagi H: "Charge dynazics and possibility of ferromagnetism in A_<1-x>La_xB_6 (A=Ca and Sr)"PHYSICAL REVIEW B. 66. 064407 (2002)

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      2002 Annual Research Report
  • [Publications] Horii S, Takagi H, Ikuta H, Hussey NE, Hirabayashi I, Nizutani U: "Dinensionality of the Cu-O double-chain site of PrBa_2Cu_4O_8"PHYSICAL REVIEW B. 66:(5). 054530 (2002)

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      2002 Annual Research Report
  • [Publications] Kobayashi K, Susaki T, Fujimori A, Tonogai T, Takagi H: "Disorder effects in the bipolaron system Ti_4O_7, studied by photoemission spectroscopy"EUROPHYSICS LETTERS. 59:(6). 868-874 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Izawa K, Kamata K, Nakajima Y, Matsuda Y, Watanabe T, Nohara M, Takagi H, Thalmeier P, Maki K: "Gap function with point nodes in borocarbide superconductor YNi_2B_2C"PHYSICAL REVIEW LETTERS. 89:(13). 137006 (2000)

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      2002 Annual Research Report
  • [Publications] Katsufuji T, Masaki M, Machida A, Moritono M, Kato K, Nishibori E, Takata H, Sakata M, Ohoyama K, Kitazawa K, Takagi H: "Crystal structure and magnetic properties of hexagonal RHnO_3 (R=Y, Lu, and Sc) and the effect of doping"PHYSICAL REVIEW B. 66:(13). 134434 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Yuhki Kohsaka, Masaki Azuna, Ikuya Yamada, Takao Sasagawa, Tetsuo Hanaguri, Mikio Takano, Hidenori Takagi: "Growth of Na-Doped Ca_2CuO_2Cl_2 Single Crystals under High Pressures of Several GPa"J.Am.Chen.Soc. Vol.124,No.41. 12275-12278 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Takaki K, Koizumi A, Hanaguri T, Nohara M, Takagi H, Kitazawa K, Kato Y, Tsuchiya Y, Kitano H, Maeda A: "Effects of superconducting gap anisotropy on the flux flow resistivity in Y(Ni_<1-x>Pt_x)(2)B_2C"Phys.Rev.B. 66:(18). 184511 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Ueda H, Kitazawa K, Matsumoto T, Takagi H: "Charge transport near pressure-induced antiferromagnetic quantum critic al point in Magneli-phase vanadium oxides"Solid State Communications. 125:(2). 83-87 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Matsuno, T.Katsufuji, SMori, Y.Moritomo, A.Machida, E.Nishibori, M.Takata, M.Sakata, N.Yamamoto, H.Takagi: "Charge Ordering in the Geometrically Frustrated Spinel AlV_2O_4"Journal of the Physical Society of Japan. Vol.70 No.6. 1456-1459 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] R.Kanno, M.Yonemura, T.Kohigashi, Y.Kawamoto, M.Tabuchi, T.Kamiyama: "Synthesis and structure of lithium manganese oxide spinel LiMn_2O_<4-δ>(0<δ<0.27)"J. Power Sources. Vol.97-98. 423-426 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Y.Ueda, H.Yamada, M.Isobe, T.Yamauchi: "Charge order and quasi-one-dimensional behavior in β(β')-A_xV_2O_5"J. Alloys and Compounds. Vol.317-318. 109-114 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] M.Hanawa, Y.Muraoka, T.Tayama, T.Sakakibara, J.Yamaura, Z.Hiroi: "Superconductivity at 1 K in Cd_2Re_2O_7"Phys. Rev. Lett.. Vol.87 No.18. 18700-18701 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Z.Hiroi, N.Kobayashi, M.Hanawa, M.Nohara, H.Takagi, Y.Kato, M.Takigawa: "Spin-1/2 kagome-like lattice in Volborthite Cu_3V_2O_7 (OH)_2/2H_2O"J. Phys. Soc. Jpn. Vol.70 No.11. 1-8 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] K.Ohwaka H.Nakao,H.Nakatogawa,N.Takesue et al.: "Pressure-Induced Phase Transition in NaV2O5 at Low Temperature"J.Phys.Soc.Jpn.. 69. 639-642 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] M.Itoh,N.Akimoto,M.Tsuchiya,H.Yamada,M.Isobe and Y.Ueda: "51V NMR study of charge ordering in AV6O15(A=Ca,Na andAg)."Physica B. 281-282. 606-607 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Z.V.Popvic,R.Gajic,M.J.Konstantinovic,R.Provoost er al.: "Infrared and Raman Spectra of LiV2O5 Single Crystal"Phys.Rev. B61. 11454-11459 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Yamada and Y.Ueda: "Structural and Electric Properties of b'-CuxV2O5."J.Phys.Soc.Jpn. 69. 1437-1442 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Yamada and Y.Ueda: "Charge and magnetic ordering in b-A0.33V2O5(A=Na,Ag,Li)."Physica B. 284-288. 1651-1652 (2000)

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      2000 Annual Research Report
  • [Publications] K.Tsuda,S.Amamiya,M.Tanaka,Y.Noda,M.Isobe and Y.Ueda: "Electron Diffraction Study of the Phase Transformation of a'-NaV2O5"J.Phys.Soc.Jpn.. 69. 1935-1938 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Yutaka Ueda: "Low-Dimensional Vanadium Oxides"J.Phys.Soc.Jpn.. Suppl.B69. 149-154 (2000)

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      2000 Annual Research Report
  • [Publications] M.Itoh,N.Akimoto,H.Yamada,M.Isobe and Y.Ueda: "NMR Study of Charge Ordering and Magnetic Correlation in Vanadium Oxide Bronzes."J.Phys.Soc.Jpn.. Suppl.B69. 155-160 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Nakao,K.Ohwada,N.Takaesue,Y.Fujii,M.Islbe,Y.Ueda et al: "X-Ray Anomalous Scattering Study of a Charge-Ordered State in VaV2O5."Phys.Rev.Lett.. 85. 4349-4352 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] M.J.Konstantinovi,Z.V.Popovi?,M.Isobe and Y.Ueda: "Raman scattering from magnetic excitations in the spin-ladder compounds CaV2O5 and MgV2O5."Phys.Rev.. B61. 15185-15188 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Azuma M,Saito T,Hiroi Z, et al.: "New S=1/2 alternating chain compound-High pressure form of (VO)(2) P2O7-"ACTA PHYS POLA. 97. 205-208 (2000)

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      2000 Annual Research Report
  • [Publications] Ishii K,Yamashita A,Ohishi K,HiroiZet al.: "Appearance of magnetic long-range order in the spin ladder compound La1-xSrxCuO2.5"Physica B. 289. 165-167 (2000)

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      2000 Annual Research Report
  • [Publications] Yamada T,Hiroi Z,Takano M et al: "Spin-1/2 Heisenberg antiferromagnetic chains in the frustrated spinel lattice of GeCu2O4"J.Phys.Soc.Jpn.. 69・5. 1477-1483 (2000)

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      2000 Annual Research Report
  • [Publications] Takeda T,Kanno R,Kawamoto Y, et al.: "Metal-semiconductor transition, charge disproportionation, and low-temperature structure of Cal-xSrxFeO3 synthesized under high-oxygen pressure"SOLID STATE SCI. 2・7. 673-687 (2000)

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      2000 Annual Research Report
  • [Publications] Gover RKB,Kanno R,Mitchell BJ, et al.: "Effects of sintering temperature on the structure of the layered phase Li-x (Ni0.8Co0.2) O-2"J ELECTROCHEM SOC. 147・11. 4045-4051 (2000)

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      2000 Annual Research Report
  • [Publications] Gover R,Kanno R,Mitchell B, et al.: "The effects of sintering time on the structure and electrochemical properties of Li (Ni0.8Co0.2) O-2"J POWER SOURCES. 90・1. 82-88 (2000)

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      2000 Annual Research Report
  • [Publications] Takeda T,Kanno R,Kawamoto Y, et al.: "New cathode materials for solid oxide fuel cells-Ruthenium pyrochlores and perovskites"J ELECTROCHEM SOC. 147・5. 1730-1733 (2000)

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      2000 Annual Research Report
  • [Publications] Kanno R,Hata T,Kawamoto Y, et al.: "Synthesis of a new lithium ionic conductor, thio-LISICON-lithium germanium sulfide system"SOLID STATE IONICS. 130・1-2. 97-104 (2000)

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      2000 Annual Research Report
  • [Publications] Y.Ogawa,S.Koshihara,K.Koshino,T.Ogawa, et al : "Dynamical Aspects of the Photoinduced Phase Transition in Spin-Crossover Complexes"Phys.Rev.Lett.. 84・14. 3181-3184 (2000)

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      2000 Annual Research Report
  • [Publications] Takahiro Yamada,Zenji Hiroi,Mikio Takano,Minoru Nothara et al: "Spin-1/2 Heisenberg Antiferromagnetic Chains in the Frustrated Spinel Lattice of GeCu_2O_4"J.Phys.Soc.Jpn. 69・5. 1477-1483 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] E.S.Bozin,G.H.Kwei,H.Takagi,and S.J.L.Bilinge : "Neutron Diffraction Evidence of Microscopic Charge Inhomogeneities in the CuO_2 Plane of Superconductiong La_<2-x> Sr_x CuO_4 (0【less than or equal】x【less than or equal】0.30)"Phys.Rev.Lett.. 84・25. 5856-5859 (2000)

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      2000 Annual Research Report
  • [Publications] C.Broholm,J.F.Ditusa,C.D.Frost,T.Ito,K.Oka,R.L.Paul,H.Takagi,M.M.J.Treacv: "Holes in a Quantum Spin Liquid Guangyong Xu,G.Aeppli,M.E.Bisher"Science. 289. 419-422 (2000)

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      2000 Annual Research Report
  • [Publications] C.Urano,M.Nohara,S.Kondo,F.Sakai,H.Taagi,T.Shiraki et al: "LiV_2O_4 Spinel as a Heavy-Mass Fermi Liquid : Anomalous Transport and Role of Geometrical Frustration"Phys.Rev.Lett.. 85・5. 1052-1055 (2000)

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      2000 Annual Research Report
  • [Publications] M.Nohara,H.Suzuki,M.Isshiki,N.Mangkorntong,F.Sakai and H.Takagi,: "Quasiparticle Density of States of Clean and Dirty d-Wave Superconductors Mixed-State Specific Heat of La_<2-x>Sr_xCuO_4 Single Crystals"J.Phys.Soc.Jpn.. 69・6. 1602-1605 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] K.Ohishi,K.KaKuta,J.Akimitsu,W.Higemoto,R.Kadono,R.I.Miller,A.Price, et al: "Anomalous Field Dependence of the Vortex-Core Radius and Magnetic Penetration Depth in YNi_2B_2C Probed by μSR"Physica B. 289-290. 377-380 (2000)

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      2000 Annual Research Report
  • [Publications] S.Horii,U.Mizutani,H.Ikuta,Y.Yamaka,J.H.Ye, et al: "Growth and Anisotropic Resistivity of PrBa_2Cu_4O_8 and Pr_2Ba_4Cu_7O_<15-y> Single Crystals : A Direct Probe of Metallic Cu-O Double Chains"Phys.Rev.. B61・9. 6327-6333 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] N.E.Hussey,H.T akagi,Y.Iye,S.Tajima,A.I.Rykov,and K.Yoshida: "Charge confinement on the CuO_2 planes in slightly overdoped YBa_2Cu_3O_<7-δ> and the role of metallic chains"Phys.Rev.. B61・10. R6475-R6478 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] S.Kondo,C.Urano,Y.Kurihara,M.Nohara,and H.TAKAGI: "From the Geometrically Frustrated Antiferromagnets Z_nV_2O_4 and ZnCr_2O_4 to the Heavy-Mass Fermi Liquid LiV_2O_4"J.Phys.Soc.Jpn.. 69・Suppl.B. 139-143 (2000)

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      2000 Annual Research Report
  • [Publications] K.Waku,N.E.Hussey,F.Sakai,M.Nohara,H.Takage, et al: "The Effect of Zn-Doping on the Magnetic Field Induced Dimensional Crossover in YBa_2Cu_4O_8"J.Phys.Soc.Jpn. 69・1. 21-24 (2000)

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      2000 Annual Research Report
  • [Publications] S.Miyasaka,H.Takagi,Y.Sekine,H.Takahashi,N.Mori et al : "Metal-Insulator Transition and Itinerant Antiferromagnetism in NiS_<2-x>Se_x Pyrite"J.Phys.Soc.Jpn. 69・10. 3166-3169 (2000)

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      2000 Annual Research Report
  • [Publications] N.E.Hussey,S.Nakamae,K.Behnia,H.Takagi,C.Urano, et al: "Absence of Residual Quasiparticle Conductivity in the Underdoped Cuprate YBa_2Cu_4O_8"Phys.Rev.Lett. 85・19. 4140-4143 (2000)

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      2000 Annual Research Report
  • [Publications] T.Yokoya,T.Kiss,T.Watanabe,S.Shin,M.Nohara,H.Takagi,and T.Oguchi: "Ultrahigh-Resolution Photoemission Spectroscopy of Ni Borocarbides : Direct Observatio of the Superconducting Gap and a Change in Gap Anisotropy by Impurity"Phys.Rev.Lett.. 85・23. 4952-4955 (2000)

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      2000 Annual Research Report

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Published: 2000-03-31   Modified: 2018-03-28  

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