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紫外線・真空紫外線を用いた光電子・逆光電子分光法による強相関物質の電子状態

Research Project

Project/Area Number16684010
Research Category

Grant-in-Aid for Young Scientists (A)

Allocation TypeSingle-year Grants
Research Field Condensed matter physics II
Research InstitutionThe University of Tokyo

Principal Investigator

溝川 貴司  東京大学, 大学院新領域創成科学研究科, 助教授 (90251397)

Project Period (FY) 2004 – 2006
Project Status Completed(Fiscal Year 2006)
Budget Amount *help
¥28,600,000 (Direct Cost : ¥22,000,000、Indirect Cost : ¥6,600,000)
Fiscal Year 2006 : ¥4,550,000 (Direct Cost : ¥3,500,000、Indirect Cost : ¥1,050,000)
Fiscal Year 2005 : ¥7,280,000 (Direct Cost : ¥5,600,000、Indirect Cost : ¥1,680,000)
Fiscal Year 2004 : ¥16,770,000 (Direct Cost : ¥12,900,000、Indirect Cost : ¥3,870,000)
Keywords強相関電子系 / 物性実験 / スピネレクトロニクス / 強相関エレクトロニクス / 光物性 / 光電子分光法 / 逆光電子分光法 / 電子状態 / 占有状態 / 非占有状態 / 光誘起相転移 / 金属絶縁体転移
Research Abstract

金属絶縁体転移を示す欠損ペロブスカイトRBaCo_2O_<6-δ>(R=Tb, Nd;δ=0.5, 1.0)、低温で重い電子的挙動を示すペロブスカイトCaCu_3Ru_4O_<12>、特異なスピン軌道秩序を示すスピネルAV_2O_4(A=Li, Zn, Cd)の電子状態を表面敏感な真空紫外線光電子分光およびパルク敏感なX線光電子分光によって研究した。特に、RBaCo_2O_<6-δ>では金属絶縁体転移に伴うe_gバンドの形状変化が観測された。CaCu_3Ru_4O_<12>では、Cuは2価であり局在したCu 3d電子が重い電子的挙動に重要であることを明らかにした。さらに、ワイドギャップ希薄磁性半導体Ti_<1-Σ>Co_xO_2、光誘起金属絶縁体転移を示すペロブスカイトPr_<0.55>(Ca_<1-y>Sr_y)_<0.45>MnO_3とスピネルCuIr_2S_4についても、光照射下においてバルク敏感なX線光電子分光と表面敏感な真空紫外線光電子分光を行い、光誘起の電子状態変化を観測した。バルク敏感な紫外線光電子分光については、Nd : YAGレーザーの第5高調波は大気による吸収を受けないエネルギー領域にあり、かつ、仕事関数を超えて光電子を放出させるのに十分なエネルギーを持つことに注目し、Nd : YAGレーザーの第5高調波によるバルク敏感な紫外線光電子分光装置を完成させて測定を行った。紫外線によるバルク敏感なエネルギー領域での逆光電子分光については、銅酸化物高温超伝導体の測定を行い、非占有状態を観測した。真空紫外線による表面敏感なエネルギー領域での逆光電子分光については、真空紫外線の検出が不十分であり有効なデータを得ることはできなかったが、電子源や光子検出について技術開発を行い、今後の発展の基礎となる成果が得られた。

Report

(3results)
  • 2006 Annual Research Report
  • 2005 Annual Research Report
  • 2004 Annual Research Report

Research Products

(17results)

All 2007 2006 2005 2004

All Journal Article

  • [Journal Article] Observation of photoinduced phase transition in phase-separated Pr_<0.55> (Ca_<1-y>Sr_y)_<0.45>MnO_3 thin films via x-ray photoemission spectroscopy2007

    • Author(s)
      K.Takubo, J.-Y.Son, T.Mizokawa, N.Takubo, K.Miyano
    • Journal Title

      Physical Review B 75

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Photoemission study of RBaCo_2O<6-δ> (R=Tb, Nd; δ=0.5, 1.0)2006

    • Author(s)
      K.Takubo, J.-Y.Son, T.Mizokawa, M.Soda, M.Sato
    • Journal Title

      Physical Review B 73

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Electronic structure of CaCu_3Ru_4O_<12> studied by x-ray photoemission spectroscopy2006

    • Author(s)
      T.T.Tran, K.Takubo, T.Mizokawa, W.Kobayashi, I.Terasaki
    • Journal Title

      Physical Review B 73

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Electronic structure of AV_2O_4 (A=Li, Zn, and Cd) studied by x-ray photoemission spectroscopy2006

    • Author(s)
      K.Takubo, J.-Y.Son, T.Mizokawa, H.Ueda, M.Isobe, Y.Matsushita, Y.Ueda
    • Journal Title

      Physical Review B 74

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Comment on "Photoemission study of YBa_2Cu_3O_y, thin films under light illumination" -Reply2006

    • Author(s)
      D.Asakura, J.W.Quilty, K.Takubo, T.Mizokawa, Y.Muraoka, Z.Hiroi
    • Journal Title

      Physical Review Letters 97

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Signature of Carrier-Induced Ferromagnetism in Ti_<1-x>Co_xO_<2-δ>: Exchange Interaction between High-Spin Co^<2+> and the Ti 3d Conduction Band2006

    • Author(s)
      J.W.Quilty, A.Shibata, J.-Y.Son, K.Takubo, T.Mizokawa, H.Toyosaki, T.Fukumura, M.Kawasaki
    • Journal Title

      Physical Review Letters 96

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Photoemission study of RBaCo_2O_<6-δ>(R=Tb, Nd; δ=0.5, 1.0)2006

    • Author(s)
      K.Takubo, J.-Y.Son, T.Mizokawa, M.Soda, M.Sato
    • Journal Title

      Physical Review B 73

    • Related Report
      2005 Annual Research Report
  • [Journal Article] X-ray absorption study of layered Co oxides with a Co-O triangular lattice2005

    • Author(s)
      T Mizokawa, L.H.Tjeng, H.-J.Lin, C.T.Chen, R.Kitawaki, I.Terasaki, S.Lambert, C.Michel
    • Journal Title

      Physical Review B 71

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Orbitally Induced Peierls State in Spinels2005

    • Author(s)
      D.I.Khomskii, T.Mizokawa
    • Journal Title

      Physical Review Letters 94

    • Related Report
      2005 Annual Research Report
  • [Journal Article] X-Ray Photoemission Study of CuIr_2S_4: Ir^<3+>-Ir^<4+> Charge Ordering and the Effect of Light Illumination,2005

    • Author(s)
      K.Takubo, S.Hirata, J.-Y.Son, J.Quilty, T.Mizokawa, N.Matsumoto, S.Nagata
    • Journal Title

      Physical Review Letters 95

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Photoinduced valence transition in gold complexes Cs_2Au_2X_6 (X=Cl and Br) probed by x-ray photoemission spectroscopy2005

    • Author(s)
      J.-Y.Son, T.Mizokawa, J.W.Quilty, K.Takubo, K.Ikeda, N.Kojima
    • Journal Title

      Physical Review B 72

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Development of high energy resolution inverse photoemission technique2005

    • Author(s)
      D.Asakura, Y.Fujii, T.Mizokawa
    • Journal Title

      Journal of Electron Spectroscopy and Related Phenomena (印刷中)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Photoemission measurements of transition-metal oxides under laser illumination2005

    • Author(s)
      J.Quily, J.-Y.Son, T.Mizokawa, D.Asakura
    • Journal Title

      Journal of Electron Spectroscopy and Related Phenomena (印刷中)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Photoemission study of YBa_2Cu_3O_Y thin films under light illumination2004

    • Author(s)
      D.Asakura, J.Quilty, K.Takubo, S.Hirata, T.Mizokawa, Y.Muraoka, Z.Hiroi
    • Journal Title

      Physical Review Letters 93

      Pages : 247006-247006

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Orbital polarization in layered t_<2g> electron systems2004

    • Author(s)
      T.Mizokawa
    • Journal Title

      New Journal of Physics 6

      Pages : 169-169

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Correlation effects in Sr_2RuO_4 and Ca_2RuO_4 : Valence-band photoemission spectra and self-energy calculations2004

    • Author(s)
      T.T.Tran, T.Mizokawa, S.Nakatsuji, H.Fukazawa, Y.Maeno
    • Journal Title

      Physical Review B 70

      Pages : 153106-153106

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Electronic structure of La_<2-2x>Sr_<1+2x>Mn_2O_7 studied by x-ray photoemission spectroscopy2004

    • Author(s)
      J-Y.Son, T.Mizokawa, J.Quilty, S.Hirata, K.Takubo, T.Kimura, Y.Tokura
    • Journal Title

      Physical Review B 70

      Pages : 12411-12411

    • Related Report
      2004 Annual Research Report

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Published : 2004-04-01   Modified : 2016-04-21  

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