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2007 Fiscal Year Annual Research Report

カーボンおよび多軌道系の超伝導

Research Project

Project/Area Number 16076201
Research InstitutionTohoku University

Principal Investigator

齋藤 理一郎  Tohoku University, 大学院・理学研究科, 教授 (00178518)

Co-Investigator(Kenkyū-buntansha) 福山 秀敏  東京理科大学, 理学部, 教授 (10004441)
岩佐 義宏  東北大学, 金属材料研究所, 教授 (20184864)
佐々木 孝彦  東北大学, 金属材料研究所, 准教授 (20241565)
Keywordsグラフェン / エッジ状態 / 層状超伝導体 / インターカレーション / モット転移 / 分子性超伝導体 / 単一種分子金属 / ギャップレスフェルミオン
Research Abstract

斎藤は、グラフェンのエッジ状態の電子格子相互作用が大きいことを見出し、超伝導転移温度を数値計算した。また、金属ナノチューブのフォノンが電子格子相互作用によってソフト化する(コーン異常)が、このソフト化がナノチューブの螺旋度によることを説明し、この性質はラマン分光の実験によって確認した。佐々木は、モット絶縁体であるBEDT-TTF系有機導体にエックス線を照射した場合、照射による分子欠陥が生じたことに起因して結晶内の電荷移動が変調され、実効的にモット絶縁体にキャリアがドープされることを見出した.このエックズ線照射効果により、室温での電気抵抗は40%程度、低温では3桁以上も小さくなることを確認した.岩佐は、層状超伝導体(LixZrNXl、LixHfNCl)の窒素原子同位体効果、ラマン散乱スペクトルのキャリヤ数依存性の測定から、本系における電子格子相互作用が非常に弱いことを示した。また、光反射スペクトルの系統的測定から、Zr系よりHf系のほうが状態密度が大きいことを示し、これがHf系の相対的に高いTcの原因であるごとを示唆した。福山は分子性結晶αET_2I_3で実現しているmassless Dirac電子の弱磁場におけるホール係数を詳細に調べ、低温で観測されている「奇妙な符号変化」がわずかなキャリアードーピングによる可能性および軌道磁性の測定がこのことを確認する適切な方法であることを指摘。同様な(しかし強いスピン・軌道相互作用にため異なる)状況にあるビスマス結晶におけるホール係数についても詳細に調べ明確な予言を試みた。さらに、広い観点から「p-d系」の面白さ・重要さを指摘した。

  • Research Products

    (50 results)

All 2008 2007 Other

All Journal Article (33 results) (of which Peer Reviewed: 33 results) Presentation (16 results) Remarks (1 results)

  • [Journal Article] Aharanove-Bohm effect for the edge states of zigzag carbon nanotubes2008

    • Author(s)
      K. Sasaki et al.
    • Journal Title

      Phys. Rev. B 77

      Pages: 045138-1〜6

    • Peer Reviewed
  • [Journal Article] Magnetism as a mass term of the edge states in graphene2008

    • Author(s)
      K. Sasaki et al.
    • Journal Title

      J. Phys. Soc. Japan 77

      Pages: 054703-1〜7

    • Peer Reviewed
  • [Journal Article] Modulation doped semiconductor-like behavior manifested in magnetotransport measurements of LixZrNCl layered superconductors2008

    • Author(s)
      T. Takano et al.
    • Journal Title

      Phys. Rev. B 77

      Pages: 104518-1-5

    • Peer Reviewed
  • [Journal Article] The t-J model as a mechanism of oxide high-Tc Superconductivity,2008

    • Author(s)
      M. Ogata
    • Journal Title

      Rep. Prog. Phys. 71

      Pages: 036501

    • Peer Reviewed
  • [Journal Article] Single-Component Molecular Metals as Multiband π-d Systems2008

    • Author(s)
      H. Seo
    • Journal Title

      J. Phys. Soc. Jpn 77

      Pages: 023714

    • Peer Reviewed
  • [Journal Article] Hall Effect and Orbital Diamagnetism in Zerogap State of Molecular Conductor α-(BEDT-TTF)_2I_3,2008

    • Author(s)
      A. Kobayashi
    • Journal Title

      J. Phys. Soc. Jpn 77

      Pages: 064718

    • Peer Reviewed
  • [Journal Article] Charge transport in carbon nanotubes : quantum effects of electron-phonon coupling2007

    • Author(s)
      S. Roche et al.
    • Journal Title

      J. Phys. Condes. Matter 19

      Pages: 183203-1〜21

    • Peer Reviewed
  • [Journal Article] Electron-phonon coupling mechanism in two-dimensional graphite and single-wall carbon nanotubes2007

    • Author(s)
      Ge. G. Samsonidze et al.
    • Journal Title

      Phys. Rev. B 75

      Pages: 155420-1〜8

    • Peer Reviewed
  • [Journal Article] Local density of states at zigzag edge of carbon nanotubes and grapheme2007

    • Author(s)
      K. Sasaki et al.
    • Journal Title

      Phys. Rev. B 75

      Pages: 235430-1〜7

    • Peer Reviewed
  • [Journal Article] Dependence of exciton transition energy of single-walled carbon nanotubes on surrounding dielectric materials2007

    • Author(s)
      Y. Miyauchi et al.
    • Journal Title

      Chem. Phys. Lett. 442

      Pages: 394-399

    • Peer Reviewed
  • [Journal Article] Raman spectroscopy of double-walled carbon nanotubes treated with H2SO42007

    • Author(s)
      E. B. Barros et al.
    • Journal Title

      Phys. Rev. B 76

      Pages: 045425-1〜11

    • Peer Reviewed
  • [Journal Article] Finite length effects in DNA-wrapped carbon nanotubes2007

    • Author(s)
      S. G. Chou et al.
    • Journal Title

      Chem. Phys. Lett. 443

      Pages: 328-332

    • Peer Reviewed
  • [Journal Article] Raman probe for selective-wrapping of single-walled carbon nanotubes by DNA2007

    • Author(s)
      Q. H. Yang et al.
    • Journal Title

      Nanotechnology 18

      Pages: 405706-1〜5

    • Peer Reviewed
  • [Journal Article] Dependence of Raman spectra G band intensity on metallicity of single-wall carbon nanotubes2007

    • Author(s)
      K. K. Kim et al.
    • Journal Title

      Phys. Rev. B 76

      Pages: 205426-1〜8

    • Peer Reviewed
  • [Journal Article] Discontinuity in the family pattern of single-wall carbon nanotubes2007

    • Author(s)
      K. Sato et al.
    • Journal Title

      Phys. Rev. B 76

      Pages: 195446-1〜7

    • Peer Reviewed
  • [Journal Article] Chirality dependence of many body effects of single wall carbon nanotubes2007

    • Author(s)
      K. Sato et al.
    • Journal Title

      Vibrational Spectroscopy 45

      Pages: 89-94

    • Peer Reviewed
  • [Journal Article] Resonance Raman study of polyynes encapsulated in single-wall carbon nanotubes2007

    • Author(s)
      L. M. Malard et al.
    • Journal Title

      Phys. Rev. B 76

      Pages: 233412-1〜4

    • Peer Reviewed
  • [Journal Article] X-ray Irradiation induced carrier doping effects in organic dimer-Mott insulators.2007

    • Author(s)
      T. sasaki et al.
    • Journal Title

      J. Phys. Soc. Jpn. 76

      Pages: 123701-1-4

    • Peer Reviewed
  • [Journal Article] Impurity effect on the superconductivity of the organic superconductor κ-(BEDT-TTF)_2Cu(NCS)_2.2007

    • Author(s)
      N. Yoneyama et al.
    • Journal Title

      J. Phys. Soc. Jpn. 76

      Pages: 123705-1-4

    • Peer Reviewed
  • [Journal Article] Dissipation in the superconducting state of κ-(BEDT-TTF)_2Cu(NCS)_2.2007

    • Author(s)
      L. Yin et al.
    • Journal Title

      Phys. Rev. B 76

      Pages: 014506-1-4

    • Peer Reviewed
  • [Journal Article] NMR study of the vortex slush phase in organic superconductor κ-(BEDT-TTF)_2Cu(NCS)_2.2007

    • Author(s)
      M. Urano et al.
    • Journal Title

      Phys. Rev. B 76

      Pages: 024505-1-4

    • Peer Reviewed
  • [Journal Article] Shubnikov-de Haas oscillations and field induced anomaly in an organic conductor β"-(EDO-TTFVO)2FeCl42007

    • Author(s)
      M. Teramura et al.
    • Journal Title

      J. Magn. Magn. Mater. 310

      Pages: 1093-1095

    • Peer Reviewed
  • [Journal Article] 強相関分子性導体における走査型放射光赤外顕微スペクトル測定による電子相分離の実空間イメージング2007

    • Author(s)
      佐々木孝彦
    • Journal Title

      日本赤外線学会誌 16

      Pages: 67-75

    • Peer Reviewed
  • [Journal Article] Pressure-induced phenomena in single-walled carbon nanotubes2007

    • Author(s)
      C. A. Kuntcher et al.
    • Journal Title

      Phys. Stat. Solidi 244

      Pages: 3982-3985

    • Peer Reviewed
  • [Journal Article] High pressure Raman study of the second-order vibrational modes of single- and double-walled carbon nanotubes2007

    • Author(s)
      K. Papagelis et al.
    • Journal Title

      Phys. Stat. Solidi 244

      Pages: 4069-4073

    • Peer Reviewed
  • [Journal Article] Tube encapsulation effects in various carbon nanotube systems2007

    • Author(s)
      D. Christofilos et al.
    • Journal Title

      Phys. Stat. Solidi 244

      Pages: 4082-4085

    • Peer Reviewed
  • [Journal Article] Stuructural study of single-walled carbon nanotube films doped by a solution method2007

    • Author(s)
      T. Takenobu et al.
    • Journal Title

      J. Nanoscience and Nanotechnology 7

      Pages: 3533-3536

    • Peer Reviewed
  • [Journal Article] Isotope effect in LixZrNCl supercnductors2007

    • Author(s)
      Y. Taguchi et al.
    • Journal Title

      Phys. Rev. B 76

      Pages: 064508-1-5

    • Peer Reviewed
  • [Journal Article] Magnetic ordering in the ammoniated fullerides (NH3)K3-xRbxC60 (x=2, 3)2007

    • Author(s)
      J. Arvanitidis et al.
    • Journal Title

      J. Phys. -Condensed Matter 19

      Pages: 386235-1-5

    • Peer Reviewed
  • [Journal Article] Suppression of current hysteresis in carbon nanotube thin-film transistors2007

    • Author(s)
      K. Tsukagoshi et al.
    • Journal Title

      Jpn. J. Appl. Phys. Part 2-Lett. & Exp. Lett. 46

      Pages: L571-L573

    • Peer Reviewed
  • [Journal Article] One-dimensional magnetism and doping effects in metal-phthalocyanine systems2007

    • Author(s)
      Y. Taguchi et al.
    • Journal Title

      J. Mag. Mag. Mater. 310

      Pages: 064508-1-5

    • Peer Reviewed
  • [Journal Article] Anomalous Orbital Magnetism and Hall Effect of Massless Fermions in Two Dimension,2007

    • Author(s)
      H. Fukuyama
    • Journal Title

      J. Phys. Soc. Jpn 76

      Pages: 043711-1-3

    • Peer Reviewed
  • [Journal Article] Massless Fermions in Organic Conductors2007

    • Author(s)
      A. Kobayashi
    • Journal Title

      J. Phys. Soc. Jpn 76

      Pages: 034711-1-6

    • Peer Reviewed
  • [Presentation] Controlling Physical Parameters of Layer-structured Nitride-halide Superconductors2008

    • Author(s)
      Y. Taguchi
    • Organizer
      American Physical Society March Meeting 2008
    • Place of Presentation
      New Orleans, LA, USA
    • Year and Date
      2008-03-01
  • [Presentation] Excitonic properties and Raman spectroscopy of single wall carbon Nanotubes2008

    • Author(s)
      Riichiro Saito
    • Organizer
      International Carbon Nanotube Conference in NU
    • Place of Presentation
      名古屋大学
    • Year and Date
      2008-02-14
  • [Presentation] Exciton and resonance Raman spectroscopy of single wall carbon nanotubes2008

    • Author(s)
      Riichiro Saito
    • Organizer
      India-Japan Cooperative Science Programme : Racent Trends in Molecular Materials Research
    • Place of Presentation
      Kovalam, Kerala, India
    • Year and Date
      2008-01-20
  • [Presentation] ナノチューブとグラフェン2007

    • Author(s)
      Riichiro Saito
    • Organizer
      20回佐々木シンポジウム
    • Place of Presentation
      東京大学
    • Year and Date
      2007-12-21
  • [Presentation] 分子系の物性2007

    • Author(s)
      福山秀敏
    • Organizer
      20回佐々木シンポジウム
    • Place of Presentation
      東京大学
    • Year and Date
      2007-12-21
  • [Presentation] Synthesis and Physical Properties of Nitride-chloride Superconductors with Layer Structure2007

    • Author(s)
      Y. Taguchi
    • Organizer
      Materials Research Society 2007 Fall Meeting
    • Place of Presentation
      Boston, MA, USA
    • Year and Date
      2007-11-27
  • [Presentation] Strongly Correlated Electrons in Molecular Solids2007

    • Author(s)
      福山秀敏
    • Organizer
      湯川国際セミナー(YKIS)
    • Place of Presentation
      京都大学時計台記念講堂
    • Year and Date
      2007-11-23
  • [Presentation] Exitonic properties of single wall carbon nanotubes2007

    • Author(s)
      Riichiro Saito
    • Organizer
      Yukawa Internationa Seminar (Kyoto Univ.)
    • Place of Presentation
      京都大学
    • Year and Date
      2007-11-16
  • [Presentation] Infrared imaging in the strongly correlated molecular conductors.2007

    • Author(s)
      Takahiko Sasaki
    • Organizer
      4^<th> International Workshop on Infrared Microscopy and Spectroscopy with Accelerator Base Sources
    • Place of Presentation
      兵庫県淡路夢舞台国際会議場
    • Year and Date
      2007-09-28
  • [Presentation] Strongly Correlated Electrons in Molecular Solids2007

    • Author(s)
      H. Fukuyama
    • Organizer
      7^<th> International Symposium on Crystalline Organic Metal, Superconductors and Ferromagnet
    • Place of Presentation
      Penisola, Spain
    • Year and Date
      2007-09-28
  • [Presentation] κ-(BEDT-TTF)_2XのX線照射効果2007

    • Author(s)
      佐々木孝彦
    • Organizer
      日本物理学会第62回年次大会
    • Place of Presentation
      北海道大学
    • Year and Date
      2007-09-22
  • [Presentation] Infrared optical spectroscopy of the organic dimer-Mott system κ-(BEDT-TTF)_2X2007

    • Author(s)
      Takahiko Sasaki
    • Organizer
      Yamada Conference LXI Spectroscopies in Novel superconductors (SNS2007)
    • Place of Presentation
      宮城県仙台国際センター
    • Year and Date
      2007-08-20
  • [Presentation] Excitonic properties of single wall carbon nanotubes2007

    • Author(s)
      Riichiro Saito
    • Organizer
      A3 Foresight Program (Meeting and Summer School) in Beijing
    • Place of Presentation
      Beijing, China
    • Year and Date
      2007-07-26
  • [Presentation] Charge transport at Organic/Organic and Organic/Inorganic Heterointerfaces in FET Structures2007

    • Author(s)
      Y. Iwasa
    • Organizer
      3rd Annual Organic Microelectronics Workshop
    • Place of Presentation
      Seattle, USA
    • Year and Date
      2007-07-10
  • [Presentation] Exciton-phonon interaction and Raman intensity of carbon nanotubes2007

    • Author(s)
      Riichiro Saito
    • Organizer
      2nd Workshop on Nanotube Optics & Nanospectro scopy, Wonton
    • Place of Presentation
      Ottawa, Canada
    • Year and Date
      2007-06-05
  • [Presentation] Electric Double Layer Transistor2007

    • Author(s)
      Y. Iwasa
    • Organizer
      2007 CERC International Workshop
    • Place of Presentation
      秋葉原コンベンションセンター
    • Year and Date
      2007-05-25
  • [Remarks]

    • URL

      http://flex.phys.tohoku.ac.jp/japanese/

URL: 

Published: 2010-06-11   Modified: 2016-04-21  

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