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2005 Fiscal Year Annual Research Report

超高速集団光応答により生じる新物質相の創出

Research Project

Project/Area Number 16076207
Research InstitutionThe University of Tokyo

Principal Investigator

宮野 健次郎  東京大学, 先端科学技術研究センター, 教授 (90167677)

Co-Investigator(Kenkyū-buntansha) 岡本 博  東京大学, 大学院・新領域創成科学研究科, 教授 (40201991)
田中 耕一郎  京都大学, 大学院・理学研究科, 教授 (90212034)
有馬 孝尚  東北大学, 多元物質科学研究所, 教授 (90232066)
Keywords光誘起相転移 / 金属・絶縁体転移 / 電気磁気効果 / 光スイッチング / マルチフェロイックス / ポンプ・プローブ分光 / 強磁場下X線回折 / テラヘルツ
Research Abstract

光誘起相転移:(1)一次元モット絶縁体BEDTTTF-F_2TCNQのフェムト秒ポンププローブ分光測定を行い、分子あたり0.003光子の弱励起においても、金属的な反射率変化の挙動を見出した。これは、一次元モット絶縁体に特有のスピン電荷分離に基づくものであると考えられる。さらに、光励起状態の超高速緩和の機構を明らかにするために、20フェムト秒の時間分解能を有するポンププローブ分光測定系を構築した。(2)Mn酸化物薄膜の永続的光誘起絶縁体・金属転移を詳細に調べ、10μmにも及ぶ相分離状態が存在し、その存在様式は、履歴、外場の種類と強さなどに敏感に依存することを明らかにした。その挙動は、複雑系の典型であるソフトマターと極めて類似し、複雑系で知られている現象論的解釈が、巨大応答をよく記述することを見出した。(3)高スピン常磁性相が全ての温度域で安定な複核スピンクロスオーバー錯体に光誘起相転移を起こし、熱的には得られない低スピン-高スピン中間層を数時間以上の寿命で得ることに成功した。(4)量子常誘電体KTaO_3の光励起キャリアは局在状態にトラップされ、トンネリングにより緩和励起子を構成するという過程によって、現象が統一的に理解できた。
電気磁気効果:巨大な電気磁気効果(交差相関)を示すペロブスカイト型Mn酸化物の無磁場下での磁気構造が横滑り型らせん磁性であることを、中性子散乱磁気構造解析により直接示した。
強磁場X線回折装置:村上班と共同で、KEK-PFに8Tの磁場印加X線回折測定システムを構築、他の班との共同研究を開始した。巨大な電気磁気効果を示すMn酸化物の不整合反強磁性の波数の変化、巨大磁気抵抗効果を示すMn酸化物における電荷・軌道整列状態の融解、スピネル型酸化物における磁場誘起構造相転移、希土類硼炭化物の磁場下での相図の測定に成功した。
テラヘルツ・ニアフィールド顕微鏡を構築した

  • Research Products

    (34 results)

All 2006 2005

All Journal Article (33 results) Book (1 results)

  • [Journal Article] Novel orbital ordering induced by anisotropic stress in a manganite thin film2006

    • Author(s)
      Y.Wakawayashi, D.Bizen, H.Nakao, Y.Murakami, M.Nakamura, Y.Ogimoto, K.Miyano, H.Sawa
    • Journal Title

      Phys.Rev.Lett. 96

      Pages: 017202-1-017202-4

  • [Journal Article] Reply to the comment on "Large Optical Nonlinearity of Semiconducting Single-Walled Carbon Nanotubes under Resonant Excitations"2006

    • Author(s)
      H.Okamoto, et al.
    • Journal Title

      Physical Review Letters 96

      Pages: 019706

  • [Journal Article] Ultrafast Phase Control in One-Dimensional Correlated Electron Systems2006

    • Author(s)
      S.Iwai, H.Okamoto
    • Journal Title

      Journal of the Physical Society of Japan 75

      Pages: 011007

  • [Journal Article] Ultrafast Photoinduced Melting of a Spin-Peierls Phase in an Organic Charge-Transfer Compound, K-Tetracyanoquinodimethane2006

    • Author(s)
      H.Okamoto, et al.
    • Journal Title

      Physical Review Letters 96

      Pages: 037405

  • [Journal Article] Coherent Control of Charge and Lattice Dynamics in a Photoinduced Neutral-to-Ionic Transition of a Charge-Transfer Compound2006

    • Author(s)
      S.Iwai, et al.
    • Journal Title

      Physical Review Letters 96

      Pages: 057403

  • [Journal Article] テラヘルツ時間領域分光の基礎と応用2006

    • Author(s)
      永井正也, 田中耕一郎
    • Journal Title

      応用物理 75,2月号

      Pages: 0179-0187

  • [Journal Article] Collinear to Spiral Spin Transformation without changing the Modulation Wavelength upon Ferroelectric Transition in Tb1_<-x>DyxMnO_32006

    • Author(s)
      T.Arima, A.Tokunaga, T.Goto, H.Kimura, Y.Noda, Y.Tokura
    • Journal Title

      Phys.Rev.Lett. 96 9

      Pages: 097202-1-097202-4

  • [Journal Article] Bidirectional optical phase control between a charge-ordered insulator and a metal in manganite thin films2005

    • Author(s)
      K.Miyano, N.Takubo
    • Journal Title

      J.Phys.IV France 131

      Pages: 43-48

  • [Journal Article] Conduction and optical effects in the plastic charge-density waves2005

    • Author(s)
      N.Ogawa, K.Miyano, S.Brazovskii
    • Journal Title

      J.Phys.IV France 131

      Pages: 123-124

  • [Journal Article] Interfacial charge transfer excitation with large optical nonlinearity in manganite heterostructure2005

    • Author(s)
      T.Satoh, K.Miyano Y.Ogimoto, H.Tamaru, S.Ishihara
    • Journal Title

      Phys.Rev.B 72

      Pages: 224403-1-224403-4

  • [Journal Article] Dimensional crossover in transport property in manganite thin films with finely controlled lattice distortion2005

    • Author(s)
      M.Nakamura, M.Izumi, K.Miyano
    • Journal Title

      J.Phys.Soc.Jpn. 74

      Pages: 3387-3390

  • [Journal Article] Critical phase control of the charge-orbital ordered manganite thin films2005

    • Author(s)
      Y.Ogimoto, M.Nakamura, N.Takubo, H.Tamaru, M.Izumi, K.Miyano
    • Journal Title

      Thin Solid films 486

      Pages: 104-107

  • [Journal Article] Persistent and reversible all-optical phase control in a manganite thin film2005

    • Author(s)
      N.TAkubo, Y.Ogimoto, M.Nakamura, H.Tamara, M.Izumi, K.Miyano
    • Journal Title

      Phys.Rev.Lett 95

      Pages: 017404-1-017404-4

  • [Journal Article] Detection of spin and charge states in centrosymmetric materials by nonlinear optics2005

    • Author(s)
      T.Satoh, T.Lottermoser, M.Fiebig, Y.Ogimoto, H.Tamaru, M.Izumi, K.Miyano
    • Journal Title

      J.Appl.Phys. 97

      Pages: 10A914-1-10A914-3

  • [Journal Article] Phase control through anisotropic strain in Nd_<0.5>Sr_<0.5>MnO_32005

    • Author(s)
      M.Nakamura, Y.Ogimoto, H.Tamaru, M.Izumi, K.Miyano
    • Journal Title

      Appl.Phys.Lett. 86

      Pages: 182504-1-182504-3

  • [Journal Article] Direct observation of excitons and a continuum of one-dimensional Mott insulators : A reflection-type third-harmonic-generation study of Ni-halogen chain compounds2005

    • Author(s)
      M.Ono, et al.
    • Journal Title

      Physical Review Letters 95

      Pages: 087401-1-087401-4

  • [Journal Article] Nonlinear and ultrafast optical response in single-walled carbon nanotubes2005

    • Author(s)
      A Maeda, et al.
    • Journal Title

      Journal of Physics : Conference Series 21

      Pages: 177-182

  • [Journal Article] Quantum Neutral-Ionic Phase Transition as Investigated by Raman Scattering and X-ray Diffraction2005

    • Author(s)
      Y.Okimoto, et al.
    • Journal Title

      Journal of the Physical Society of Japan 74

      Pages: 2165-2168

  • [Journal Article] Third-order optical nonlinearity in regio-controlled polythiophene films2005

    • Author(s)
      H.Kishida, et al.
    • Journal Title

      Applied Physics Letters 87

      Pages: 121902

  • [Journal Article] Two-Step Spin Conversion in a Cyanide-Bridged Ferrous Square2005

    • Author(s)
      M.Nihei, et al.
    • Journal Title

      Angewandte Chemie International Edition 44

      Pages: 6484-6487

  • [Journal Article] Third-order nonlinear optical spectroscopy in charge-transfer-type conjugated polymers2005

    • Author(s)
      H.Kishida, et al.
    • Journal Title

      Synthetic Metals 153

      Pages: 141-144

  • [Journal Article] Destructive interference effect on surface plasmon resonance in terahertz attenuated total reflection2005

    • Author(s)
      H.Hirori, M.Nagai, K.Tanaka
    • Journal Title

      Optics Express 13

      Pages: 10801-10814

  • [Journal Article] Photoinduced spin crossover in a Fe-picolylamine complex : A far-infrared study on single crystals2005

    • Author(s)
      H.Okamura, M.Matsubara, T.Nanba, T.Tayagaki, S.Mouri, K.Tanaka Y.Ikemoto, T.Moriwaki, H.Kimura, G.Juhasz
    • Journal Title

      Phys.Rev.B 72

      Pages: 073108

  • [Journal Article] Time-resolved X-ray diffraction : a wonderful tool for probing structural photo-induced phase transitions2005

    • Author(s)
      M.Buron-Le Cointe, E.Collet, L.Guerin, M.H.Lemee-Cailleau, H.Cailleau, M.Wulff T.Luty, S.Koshihara, K.Tanaka
    • Journal Title

      J.Luminescence 112

      Pages: 235-241

  • [Journal Article] Strong blue emission from Ti-doped MgAl_2O_4 crystals2005

    • Author(s)
      Tokushi Sato, Masanobu Shirai, Koichiro Tanaka, Yutaka Kawabe, Eiichi Hanamura
    • Journal Title

      J.Luminescence 114

      Pages: 155-161

  • [Journal Article] Decoupling of themolecular spin state and the crystallographic phase change in the spin crossover complex [Fe(ptz)6](BF4)2 studied by Raman spectroscopy2005

    • Author(s)
      Nawel Ould Moussa, Xavier Ducros, Ga'bor Molna'r, Antoine Zwick, Takeshi Tayagaki, Koichiro Tanaka, Azzedine Bousseksou
    • Journal Title

      Chem.Phys.Lett 402

      Pages: 503

  • [Journal Article] Photoexcited carrier dynamics in Potassium Tantalate2005

    • Author(s)
      I.Katayama, M.Watanabe, T.Hayashi, K.Tanaka
    • Journal Title

      J.Luminescence 112

      Pages: 242

  • [Journal Article] Photo-induced suppression of ferroelectric transition in oxygen-isotope-exchanged SrTiO_32005

    • Author(s)
      Yasuhiro Yamada, Koichiro Tanaka
    • Journal Title

      J.Luminescence 112

      Pages: 259

  • [Journal Article] Metal dilution effects on the spin crossover properties of the three-dimensional coordination polymer Fe(pyrazine)[Pt(CN)4]2005

    • Author(s)
      Takeshi Tayagaki, Ana Galet, Ga'bor Molna'r, Maria Carmen, Mun〜oz, Antoine Zwick, Koichiro Tanaka, Jose'-Antonio Real, Azzedine Bousseksou
    • Journal Title

      J.Phys.Chem.B; 109(31)

      Pages: 14859-14867

  • [Journal Article] Observation of nonreciprocal magnetoelectric x-ray scattering in magnetite2005

    • Author(s)
      M.Matsubara, Y.Shimada, T.Arima, Y.Taguchi, Y.Tokura
    • Journal Title

      Phys.Rev.B 72 22

      Pages: 220404R-1-220404R-4

  • [Journal Article] Magnetic-field-induced transition in the lattice modulation of colossal magnetoelectric GdMnO3 and TbMnO3 compounds2005

    • Author(s)
      T.Arima, T.Goto, Y.Yamasaki, S.Miyasaka, K.Ishii, M.Tsubota, T.Inami, Y.Murakami, Y.Tokura
    • Journal Title

      Phys.Rev.B 72 10

      Pages: 100102R-1-100102R-4

  • [Journal Article] Effect of Mn trimerization on the magnetic and dielectric properties of hexagonal YMnO32005

    • Author(s)
      Y.Aikawa, T.Katsufuji, T.Arima, K.Kato
    • Journal Title

      Phys.Rev.B 71 18

      Pages: 184418(1)-184418(5)

  • [Journal Article] Resonant Magnetoelectric X-ray Scattering in GaFeO3 : Observation of Ordering of Toroidal Moments2005

    • Author(s)
      T.Arima, J.H.Jung, M.Matsubara, M.Kubota, J.P.He, Y.Kaneko, Y.Tokura
    • Journal Title

      J.Phys.Soc.Jpn. 74 5

      Pages: 1419-1422

  • [Book] Terahertz Optoelectronics(Attenuated Total Reflection Spectroscopy)(editted by K.Syakai)2005

    • Author(s)
      Koichiro Tanaka (共著)
    • Total Pages
      387
    • Publisher
      Springer

URL: 

Published: 2007-04-02   Modified: 2016-04-21  

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