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2007 Fiscal Year Annual Research Report

電子機能物質における自己組織化の解明と応用

Research Project

Project/Area Number 16GS0219
Research InstitutionThe Institute of Physical and Chemical Research

Principal Investigator

加藤 礼三  The Institute of Physical and Chemical Research, 加藤分子物性研究室, 主任研究員 (80169531)

Co-Investigator(Kenkyū-buntansha) 古崎 昭  独立行政法人理化学研究所, 古崎物性理論研究室, 主任研究員 (10238678)
塚越 一仁  独立行政法人理化学研究所, 河野低温物理研究室, 客員主管研究員 (50322665)
辛 埴  国立大学法人東京大学, 物性研究所, 教授 (00162785)
高木 英典  国立大学法人東京大学, 大学院・新領域創成科学研究科, 教授 (40187935)
桃井 勉  独立行政法人理化学研究所, 古崎物性理論研究室, 専任研究員 (80292499)
Keywords電子機能物質 / 自己組織化 / 強相関電子系 / 分子性導体 / 遷移金属酸化物 / ディラックフェルミオン系 / 超伝導 / フラストレーション
Research Abstract

・超伝導体2H-NbSe_2の超高分解能角度分解光電子分光を行い、超伝導と電荷密度波が同じk点において共存し、かつそのk点において最大の超伝導性を持つという、従来の理解とは全く異なる新しい超伝導と電荷秩序の関連を見出した(辛、高木)。新規2機能性分子導体(Me-3,5-DIP)[Ni(dmit)_2]_2の超高分解能光電子分光を行い、金属的な分子層に起因する明瞭なフェルミ端を確認すると共に、光電子スペクトルの温度変化から絶縁性分子層の磁性転移に起因する構造を見出し、この変化が近藤転移である可能性を示唆した(辛、加藤)。
・ディラックフェルミオン系電気伝導体の低次元伝導を制御することを目的として、ナノグラファイトリボンの電気伝導を計測し、伝導体内のポテンシャル揺らぎと伝導の相関を見出した(塚越)。また、2次元ディラックフェルミオンに対する不純物散乱効果を理論的に解析し、時間反転対称な系に対する非線形シグマ模型のトポロジカル項を導いた(古崎)。一方、昨年度単結晶として最初のディラックフェルミオン系であることを報告した有機導体α-(ET)_2I_3の層間磁気抵抗の振る舞いをゼロモードLandau準位で説明することに成功した(加藤)。
・有機物および酸化物の幾何学的フラストレーション系の物質開発とそこでの電子自己組織化現象の探索を継続した(加藤、高木)。新規パイロクロア型Ru酸化物の基底状態を圧力下で系統的に調べ、電子の軌道の有無によって、電荷とスピンの自己組織化パターンと圧力相図が劇的に異なることを明らかにした。また、新規スピネル酸化物LiRh_2O_4の電荷自己組織化においても軌道の自由度の役割が本質的であることを理論グループとの緊密な連携により明らかにした。一方、有機フラストレーション系Pd(dmit)_2塩において、スピンギャップを持つスピン一重項対秩序相に隣接する超伝導を初めて見出した。

  • Research Products

    (76 results)

All 2008 2007

All Journal Article (42 results) (of which Peer Reviewed: 42 results) Presentation (33 results) Patent(Industrial Property Rights) (1 results)

  • [Journal Article] Supramolecular insulating networks sheathing conducting nanowires based on organicradical cations2008

    • Author(s)
      H. M. Yamamoto
    • Journal Title

      ACS Nano 2

      Pages: 143-155

    • Peer Reviewed
  • [Journal Article] Coulomb blockade oscillations in patterned ultra-thin graphite films2008

    • Author(s)
      S. Odaka
    • Journal Title

      Japanese Journal of Applied Physics (in press)

    • Peer Reviewed
  • [Journal Article] A different type of reentrant behavior in superconductor/thin graphite film/superconductor Josephson junctions2008

    • Author(s)
      T. Sato
    • Journal Title

      Journal of Physics (in press)

    • Peer Reviewed
  • [Journal Article] Coulomb blockade oscillations in narrow corrugated graphite ribbons2008

    • Author(s)
      H. Miyazaki
    • Journal Title

      Applied Physics Express (in press)

    • Peer Reviewed
  • [Journal Article] Hard x-ray photoemission study of LaAlO_3/LaVO_3 multilayers2008

    • Author(s)
      H. Wadati
    • Journal Title

      Physical Review B 77

      Pages: 045122

    • Peer Reviewed
  • [Journal Article] Bulk electronic structure of the antiferromagnetic superconducting phase in ErNi_2B_2C2008

    • Author(s)
      T. Baba
    • Journal Title

      Physical Review Letters 100

      Pages: 017003

    • Peer Reviewed
  • [Journal Article] Mott transition in a valence-bond solid insulator with a triangular lattice2007

    • Author(s)
      Y. Shimizu
    • Journal Title

      Physical Review Letters 99

      Pages: 256403(4)

    • Peer Reviewed
  • [Journal Article] Magnetoresistance of quasi two-dimensional organic conductors κ (BEDT-TSeF)_2FeX_4 (X=Cl, Br) and mapping of Fermi surface2007

    • Author(s)
      S. Sugawara
    • Journal Title

      Journal of the Physical Society of Japan 76

      Pages: 114706(7)

    • Peer Reviewed
  • [Journal Article] Transport properties of massless Dirac fermions in an organic conductor α-(BEDT-TTF)_2I_3 under pressure2007

    • Author(s)
      N. Tajima
    • Journal Title

      Europhysics Letters 80

      Pages: 47002(5)

    • Peer Reviewed
  • [Journal Article] Technique for anisotropic extension of organic crystals: Application to temperature dependence of electrical resistance2007

    • Author(s)
      T. Yamamoto
    • Journal Title

      Review of Scientific Instruments 78

      Pages: 083906(11)

    • Peer Reviewed
  • [Journal Article] Synthesis and solution-processed field effect transistors of liquid crystalline oligothiophenes2007

    • Author(s)
      M. Ashizawa
    • Journal Title

      Chemistry Letters 36

      Pages: 708-709

    • Peer Reviewed
  • [Journal Article] Charge ordered state and frustration of site charges in (ET)_5Te_2I_6 and (BETS)_5Te_2I_62007

    • Author(s)
      T. Yamamoto
    • Journal Title

      Physical Review B 75

      Pages: 205132(18)

    • Peer Reviewed
  • [Journal Article] Magnetic study of quantum triangular antiferromagnet [Pd(dmit)_2] salts under pressure2007

    • Author(s)
      M. Tamura
    • Journal Title

      Journal of Physics: Condensed Matter 19

      Pages: 145239(6)

    • Peer Reviewed
  • [Journal Article] Coexistence of conducting and magnetic electrons based on molecular π-electrons in the supramolecular conductor (Me-3,5-DIP)[Ni(dmit)_2]_22007

    • Author(s)
      Y. Kosaka
    • Journal Title

      Journal of the American Chemical Society 129

      Pages: 3054-3055

    • Peer Reviewed
  • [Journal Article] Temperature-pressure phase diagram in TTF-TCNQ: Strong suppression of charge-density-wave state under extremely high pressure2007

    • Author(s)
      S. Yasuzuka
    • Journal Title

      Journal of the Physical Society of Japan 76

      Pages: 033701(4)

    • Peer Reviewed
  • [Journal Article] Magnetic study of pressure-induced superconductivity in the [Pd(dmit)_2] salt with spin-gapped ground state2007

    • Author(s)
      Y. Ishii
    • Journal Title

      Journal of the Physical Society of Japan 76

      Pages: 033704(4)

    • Peer Reviewed
  • [Journal Article] Asymmetric zero-bias anomaly for strongly-interacting electrons in one dimension2007

    • Author(s)
      K. A. Matveev
    • Journal Title

      Physical Review Letters 98

      Pages: 096403(4)

    • Peer Reviewed
  • [Journal Article] Landauer conductance and twisted boundary conditions for Dirac fermions in two space dimensions2007

    • Author(s)
      S. Ryu
    • Journal Title

      Physical Review B 75

      Pages: 205344(13)

    • Peer Reviewed
  • [Journal Article] Z_2 topological term, the global anomaly, and the two-dimensional symplectic symmetry class of Anderson localization2007

    • Author(s)
      S. Ryu
    • Journal Title

      Physical Review Letters 99

      Pages: 116601(4)

    • Peer Reviewed
  • [Journal Article] Multimagnon bound states in the frustrated ferromagnetic one-dimensional chain2007

    • Author(s)
      L. Kecke
    • Journal Title

      Physical Review B 76

      Pages: 060407(4)

    • Peer Reviewed
  • [Journal Article] Bosonization of strongly interacting one-dimensional electrons2007

    • Author(s)
      K.A. Matveev
    • Journal Title

      Physical Review B 76

      Pages: 155440(21)

    • Peer Reviewed
  • [Journal Article] Symmetry considerations on the magnetization process of the Heisenberg model on the pyrochlore lattice2007

    • Author(s)
      K. Penc
    • Journal Title

      Journal of Physics: Condensed Matter 19

      Pages: 145267(9)

    • Peer Reviewed
  • [Journal Article] Finite-temperature phase transitions in quasi-one-dimensional molecular conductors2007

    • Author(s)
      H. Seo
    • Journal Title

      Journal of the Physical Society of Japan 76

      Pages: 013707(4)

    • Peer Reviewed
  • [Journal Article] Antiferromagnetic Ising model on inverse perovskite lattice2007

    • Author(s)
      D. Tahara
    • Journal Title

      Journal of the Physical Society of Japan 76

      Pages: 013708-(4)

    • Peer Reviewed
  • [Journal Article] Charge ordering and coexistence of charge fluctuations in quasi-two-dimensional organic conductors θ-(BEDT-TTF)_2X2007

    • Author(s)
      M. Udagawa
    • Journal Title

      Physical Review Letters 98

      Pages: 206405(4)

    • Peer Reviewed
  • [Journal Article] Exact diagonalization study of Mott transition in the Hubbard model on an anisotropic triangular lattice2007

    • Author(s)
      T. Koretsune
    • Journal Title

      Journal of the Physical Society of Japan 76

      Pages: 074719(10)

    • Peer Reviewed
  • [Journal Article] Electron transport in thin graphite films: effect of microfabrication processes2007

    • Author(s)
      T. Moriki
    • Journal Title

      Physica E 40

      Pages: 241-244

    • Peer Reviewed
  • [Journal Article] Observation of a superconducting gap in Boron-doped diamond by laser-excited photoemission spectroscopy2007

    • Author(s)
      K. Ishizaka
    • Journal Title

      Physical Review Letters 98

      Pages: 047003

    • Peer Reviewed
  • [Journal Article] Electronic structure of VO_2/TiO_2: Nb upon photocarrier injection2007

    • Author(s)
      R. Eguchi
    • Journal Title

      Physical Review B 75

      Pages: 073102

    • Peer Reviewed
  • [Journal Article] Interplay of superconductivity and rattling phenomena in b-pyrochlore Kos_2O_6 studied by photoemission spectroscopy2007

    • Author(s)
      T. Shimojima
    • Journal Title

      Physical Review Letters 99

      Pages: 117003

    • Peer Reviewed
  • [Journal Article] Recent photoemission studies on MgB_2 and related materials2007

    • Author(s)
      S. Tsuda
    • Journal Title

      Physica C 456

      Pages: 126-133

    • Peer Reviewed
  • [Journal Article] Evidence for two energy scales in the superconducting state of optimally doped (Bi, Pb)_2 CuO_6+δ2007

    • Author(s)
      T. Kondo
    • Journal Title

      Physical Review Letters 98

      Pages: 267004

    • Peer Reviewed
  • [Journal Article] Direct observation of valence transition in CeNil-xCoxSn alloys by x-ray and photoelectron spectroscopies2007

    • Author(s)
      H. Yamaoka
    • Journal Title

      Physical Review B 76

      Pages: 075130(8 pages)

    • Peer Reviewed
  • [Journal Article] Charge-order-miximized momentum-dependent superconductivity2007

    • Author(s)
      T. Kiss
    • Journal Title

      Nature Physics 3

      Pages: 720-725

    • Peer Reviewed
  • [Journal Article] Degree of circular polarization of soft x-rays emitted from a multi-polarization-mode undulator characterized by means of magnetic circular dichroism measurement2007

    • Author(s)
      M. Oura
    • Journal Title

      Journal of Synchrotron Radiation 14

      Pages: 483-486

    • Peer Reviewed
  • [Journal Article] Intermediate-valence behavior of YbCu_5-xAlx around quantum critical point measured by resonant inelastic x-ray scattering at Yb L3 absorption edge2007

    • Author(s)
      K. Yamamoto
    • Journal Title

      Journal of the Physical Society of Japan 76

      Pages: 124705

    • Peer Reviewed
  • [Journal Article] Metal-insulator transition in a pyrochlore-type ruthenium oxide, Hg_2Ru_2O_72007

    • Author(s)
      A. Yamamoto
    • Journal Title

      Journal of the Physical Society of Japan 76

      Pages: 043703

    • Peer Reviewed
  • [Journal Article] Spiral spin structure in the Heisenberg pyrochlore magnet CdCr_2O_42007

    • Author(s)
      M. Matsuda
    • Journal Title

      Physical Review B 75

      Pages: 104415

    • Peer Reviewed
  • [Journal Article] Pressure-induced transition from a correlated insulator to a Fermi liquid observed in geometrically frustrated Hg_2Ru_2O_7 pyrochlore2007

    • Author(s)
      N. Takeshita
    • Journal Title

      Journal of the Physical Society of Japan 76

      Pages: 063707

    • Peer Reviewed
  • [Journal Article] Pressure-induced structural phase transition in LiV_2O_42007

    • Author(s)
      L. Pinsard-Gaudart
    • Journal Title

      Physical Review B 76

      Pages: 045119

    • Peer Reviewed
  • [Journal Article] Spin-liquid state in S=1/2 hyper-kagome antiferromagnet Na_4Ir_3O_82007

    • Author(s)
      Y. Okamoto
    • Journal Title

      Physical Review Letters 99

      Pages: 137207

    • Peer Reviewed
  • [Journal Article] Correlation-Driven Heavy-Fermion Formation in LiV_2O_42007

    • Author(s)
      P. E. Jonsson
    • Journal Title

      Physical Review Letters 99

      Pages: 167402

    • Peer Reviewed
  • [Presentation] S=1/2ハイパーカゴメ物質Na_4Ir_3O_8におけるスピン液体状態2008

    • Author(s)
      高木英典
    • Organizer
      日本物理学会第63回年次大会
    • Place of Presentation
      大阪
    • Year and Date
      2008-03-24
  • [Presentation] Magnetic fluctuations in the Hubbard model on Kagome-based frustrated lattices2008

    • Author(s)
      M. Udagawa
    • Organizer
      2008 American Physical Society March Meeting
    • Place of Presentation
      New Orleans, USA
    • Year and Date
      2008-03-13
  • [Presentation] Numerical study of finite-temperature phase transitions in quasi-one-dimensional molecular conductors2008

    • Author(s)
      Y. Otsuka
    • Organizer
      2008 American Physical Society March Meeting
    • Place of Presentation
      New Orleans, USA
    • Year and Date
      2008-03-10
  • [Presentation] Charge frustration and novel electron-lattice coupled phase transition in organic conductor DI-DCNQI_2Ag2008

    • Author(s)
      H. Seo
    • Organizer
      2008 American Physical Society March Meeting
    • Place of Presentation
      New Orleans, USA
    • Year and Date
      2008-03-10
  • [Presentation] Quantum liquid state of spins and charges in geometrically frustrated spinel oxides2008

    • Author(s)
      H. Takagi
    • Organizer
      Ultracold NanoMatter
    • Place of Presentation
      Toronto, Canada
    • Year and Date
      2008-02-14
  • [Presentation] Coulomb blockade oscillations in ultrathin graphite film with corrugation2007

    • Author(s)
      H. Miyazaki
    • Organizer
      International Symposium on Advanced Nanodevices and Nanotechnology(ISANN2007)
    • Place of Presentation
      Waikaloa, USA
    • Year and Date
      20071202-07
  • [Presentation] Superconducting proximity effect in superthin graphite films2007

    • Author(s)
      T. Sata
    • Organizer
      International Symposium on Advanced Nanodevices and Nanotechnology(ISANN2007)
    • Place of Presentation
      Waikaloa, USA
    • Year and Date
      20071202-07
  • [Presentation] 軟X線発光分光法による溶液の電子状態の解明2007

    • Author(s)
      原田慈久
    • Organizer
      第27回表面科学講演大会
    • Place of Presentation
      東京大学生産技術研究所
    • Year and Date
      20071101-03
  • [Presentation] Gating control of conduction of thin graphite film2007

    • Author(s)
      K. Tsukagoshi
    • Organizer
      International Conference on carbon nanoscience and nanotechnology(NanoteC2007)
    • Place of Presentation
      Brighton, UK
    • Year and Date
      20070829-0901
  • [Presentation] Heme Fe 3d states in myoglobin solutions explored by soft x-ray emission spectroscopy2007

    • Author(s)
      Y. Harada
    • Organizer
      15th International Conference on Vacuum Ultraviolet Radiation Physics (VUV XV)
    • Place of Presentation
      Berlin, Germany
    • Year and Date
      20070729-0803
  • [Presentation] Electric potential corrugation in transport of ultra-thin graphite film2007

    • Author(s)
      H. Miyazaki
    • Organizer
      International Conference on Electronic Properties of Two-dimensional Systems and Modulated Semiconductor Structures
    • Place of Presentation
      Genova, Italy
    • Year and Date
      20070715-20
  • [Presentation] Coulomb blockade oscillations in patterned ultra-thin graphite films2007

    • Author(s)
      S. Odaka
    • Organizer
      2007 International Symposium on Organic and Inorganic Electronic Materials and Related Nanotechnologies(EM-NANO 2007)
    • Place of Presentation
      Nagano, Japan
    • Year and Date
      20070619-22
  • [Presentation] Electronic structure of heme iron in aqueous myoglobins observed by resonant softx-ray emission spectroscopy2007

    • Author(s)
      Y. Harada
    • Organizer
      6th International Conference on Inelastic X-ray Scattering(IXS2007)
    • Place of Presentation
      Awaji, Japan
    • Year and Date
      20070507-11
  • [Presentation] Soft x-ray RIXS2007

    • Author(s)
      S. Shin
    • Organizer
      6th International Conference on Inelastic X-ray Scattering (IXS2007)
    • Place of Presentation
      Awaji, Japan
    • Year and Date
      20070507-11
  • [Presentation] Single electron device formation in thin graphite films2007

    • Author(s)
      S. Odaka
    • Organizer
      The Sixth international Conference on Low Dimensional Structures and Devices(LDSD2007),
    • Place of Presentation
      San Andres, Colombia
    • Year and Date
      20070415-20
  • [Presentation] 金属と有機物との連携が生み出すエキゾチックな分子性導体2007

    • Author(s)
      加藤礼三
    • Organizer
      物性研究所短期研究会「物性化学のフロンティア2007」
    • Place of Presentation
      Kashiwa, Japan
    • Year and Date
      2007-11-22
  • [Presentation] Anderson localization in the 2D symplectic class revisited2007

    • Author(s)
      A. Furusaki
    • Organizer
      Yukawa International Seminar 2007 "Interaction and Nanostructural Effects in Low-Dimensional Systems"
    • Place of Presentation
      Kyoto, Japan
    • Year and Date
      2007-11-20
  • [Presentation] Quantum liquid produced by geometrical frustration in spinel oxides2007

    • Author(s)
      H. Takagi
    • Organizer
      Moments and Multiplets in Mott Materials (KITP)
    • Place of Presentation
      Santa Barbara, USA
    • Year and Date
      2007-11-19
  • [Presentation] Nematic and octupolar phases in the multiple spin exchange models2007

    • Author(s)
      T. Momoi
    • Organizer
      International Symposium on Physics of New Quantum Phases in Superclean Materials (PSM2007)
    • Place of Presentation
      Gifu, Japan
    • Year and Date
      2007-10-31
  • [Presentation] Spin liquid state in S=1/2 hyper-kagome antiferromagnet Na_4Ir_3O_82007

    • Author(s)
      H. Takagi
    • Organizer
      International Symposium on Physics of New Quantum Phases in Superclean Materials (PSM2007)
    • Place of Presentation
      Gifu, Japan
    • Year and Date
      2007-10-30
  • [Presentation] Frustrated quantum antiferromagnets, [Pd(dmit)_2] salts2007

    • Author(s)
      M. Tamura
    • Organizer
      International Symposium on Physics of New Quantum Phases in Superclean Materials (PSM2007)
    • Place of Presentation
      Gifu, Japan
    • Year and Date
      2007-10-29
  • [Presentation] Top-down and bottom-up nanoscience of molecular conductors2007

    • Author(s)
      H. M. Yamamoto
    • Organizer
      International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets (ISCOM2007)
    • Place of Presentation
      Peniscola, Spain
    • Year and Date
      2007-09-27
  • [Presentation] Spin and charge frustration in new geometrically frustrate oxide with spinel-related structure2007

    • Author(s)
      H. Takagi
    • Organizer
      International Symposium on Strongly-Correlated Applied Physics
    • Place of Presentation
      Tokyo, Japan
    • Year and Date
      2007-09-27
  • [Presentation] Valence bond physics in the frustrated quantum antiferromagnets, [Pd (dmit)_2] salts2007

    • Author(s)
      M. Tamura
    • Organizer
      International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets (ISCOM2007)
    • Place of Presentation
      Peniscola, Spain
    • Year and Date
      2007-09-26
  • [Presentation] High pressure magnetic study on the [Pd (dmit)_2] salts2007

    • Author(s)
      Y. Ishii
    • Organizer
      International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets (ISCOM2007)
    • Place of Presentation
      Peniscola, Spain
    • Year and Date
      2007-09-26
  • [Presentation] Development of molecular conductors based on metal dmit complexes2007

    • Author(s)
      R. Kato
    • Organizer
      International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets (ISCOM2007)
    • Place of Presentation
      Peniscola, Spain
    • Year and Date
      2007-09-25
  • [Presentation] Solution-processed field effect transistors (FETs) made of liquid crystalline oligothiophenes2007

    • Author(s)
      M. Ashizawa
    • Organizer
      International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets (ISCOM2007)
    • Place of Presentation
      Peniscola, Spain
    • Year and Date
      2007-09-25
  • [Presentation] Technique for anisotropic extension of molecular crystals: Application to organic superconductors2007

    • Author(s)
      T. Yamamoto
    • Organizer
      International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets (ISCOM2007)
    • Place of Presentation
      Peniscola, Spain
    • Year and Date
      2007-09-25
  • [Presentation] Crystalline supramolecular nanowires based on molecular conductors2007

    • Author(s)
      H. M. Yamamoto
    • Organizer
      9th European Conference on Molecular Electronics
    • Place of Presentation
      Metz, France
    • Year and Date
      2007-09-05
  • [Presentation] Octupolar order in the multiple spin exchange model on a triangular lattice2007

    • Author(s)
      T. Momoi
    • Organizer
      Workshop on Highly Frustrated Magnets and Strongly Correlated Systems: From Non-Perturbative Approaches to Experiments
    • Place of Presentation
      Trieste, Italy
    • Year and Date
      2007-08-16
  • [Presentation] New and old spinel oxides with geometrical frustration2007

    • Author(s)
      H. Takagi
    • Organizer
      Exploring Quantum Matter: Visions and Opportunities
    • Place of Presentation
      Trieste, Italy
    • Year and Date
      2007-08-10
  • [Presentation] Quantum criticality and disorder-High pressure studies2007

    • Author(s)
      H. Takagi
    • Organizer
      2007 CERC International Symposium
    • Place of Presentation
      Akihabara, Japan
    • Year and Date
      2007-05-22
  • [Presentation] Spin and charge frustration in new Ir and Rh spinel oxides2007

    • Author(s)
      H. Takagi
    • Organizer
      International Conference on Strongly Correlated Electron Systems
    • Place of Presentation
      Houston, USA
    • Year and Date
      2007-05-18
  • [Patent(Industrial Property Rights)] グラファイト超薄膜FETにおけるAl電極による高効率ゲート2007

    • Inventor(s)
      宮崎久生, 塚越一仁, 小高隼介, 青柳克信
    • Industrial Property Rights Holder
      独立行政法人理化学研究所
    • Industrial Property Number
      特願2007-265556
    • Filing Date
      2007-10-11

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Published: 2010-02-04   Modified: 2016-04-21  

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