配列ナノ空間における特異な物性の解明と高機能デバイス開発における振電効果の役割

• Project Area: New Materials Science Using Regulated Nano Spaces －Strategy in Ubiquitous Elements
• Project/Area Number: 22013017
• Research Category: Grant-in-Aid for Scientific Research on Priority Areas
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Nagasaki Institute of Applied Science
• Principal Investigator: 加藤 貴 長崎総合科学大学, 大学院・工学研究科, 准教授 (10399214)
• Project Period (FY): 2010 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥2,200,000 (Direct Cost: ¥2,200,000); Fiscal Year 2011: ¥1,100,000 (Direct Cost: ¥1,100,000); Fiscal Year 2010: ¥1,100,000 (Direct Cost: ¥1,100,000)
• Keywords: ピセン / 超伝導性 / 電子-フォノン相互作用 / ポリフェナセン / オームの法則 / 反磁性超電流 / トンネル効果 / 電流-電圧特性

Research Abstract

1.最近、発見されたピセン超伝導体の電子構造等の解説を行なった。また最近、超伝導性が発見されたpiceneアニオンの電子-フォノン相互作用結合定数を見積もり、超伝導性の考察をした。piceneアニオンの超伝導性は電子-フォノン相互作用で説明できることを示した。日本経済新聞2011年11月7日朝刊の11頁に「液体窒素で超伝導に:長崎総合科学大 有機物、計算で導く」という見出しで研究内容が紹介された。また本年度の研究成果が引き金となり、本研究代表者の2002年のJ.Chem.Phys.の論文が世界中に広く認知されるようになり、ここ半年間で、非常に高い被引用回数となった。なお、そのうちの2編はnatureの論文に最後のまとめとして長い文章で引用されていて、我々の研究が、高温超伝導実現に大きな指針を与える事が示されている。
2.TTF-TCNQ分子性結晶固体など、分数電荷を持つインコメンシュレート系において、正確に電子-フォノン相互作用を見積もる計算方法を世界で初めて開発した。我々の計算結果はPaulisusceptibility等から得られる実験結果と非常に良い一致を示し、計算方法の妥当性を示した。
3.電子-フォノン相互作用の強さが、ドープ量とどのように関係しているかを考察した。閉殻電子系から、0.71～0.86の分数電荷だけドープされた分子性結晶固体において、電子-フォノン相互作用が非常に強くなる事を示した。

Research Products

• [Journal Article] Non-Ohmic current-voltage characteristics in the positively charged tetrathiafulvalene (TTF) molecular crystals (2011)
  • Author(s): Takashi Kato
  • Journal Title: Synth.Met. Volume: 161 Issue: 9-10 Pages: 704-712
  • DOI: 10.1016/j.synthmet.2011.01.018
  • Peer Reviewed
• [Journal Article] New method of accurate estimation of the electron-phonon coupling constants in fractionally charged incommensurate electronic states in molecular systems (2011)
  • Author(s): Takashi Kato
  • Journal Title: J.Chem.Phys. Volume: 135 Issue: 2 Pages: 24103-24103
  • DOI: 10.1063/1.3600066
  • Peer Reviewed
• [Journal Article] Strong intramolecular electron-phonon coupling in negatively charged aromatic superconductor picene (2011)
  • Author(s): Takashi Kato, Takashi Kambe, Yoshihiro Kubozono
  • Journal Title: Phys.Rev.Lett. Volume: 107 Issue: 7 Pages: 77001-77001
  • DOI: 10.1103/physrevlett.107.077001
  • Peer Reviewed
• [Journal Article] The role of phonon- and photon-coupled interactions in electron pairing in solid state materials (2011)
  • Author(s): Takashi Kato
  • Journal Title: Synth.Met. Volume: 161 Issue: 19-20 Pages: 2113-2123
  • DOI: 10.1016/j.synthmet.2011.08.012
  • Peer Reviewed
• [Journal Article] Dependence of electron-phonon interactions on doped carriers in the negatively fractionally charged polyacene molecular crystals (2011)
  • Author(s): Takashi Kato
  • Journal Title: J.Phys.Chem.C Volume: 115 Issue: 43 Pages: 21383-21389
  • DOI: 10.1021/jp203502y
  • Peer Reviewed
• [Journal Article] Metal-intercalated aromatic hydrocarbons : a new class of carbon-based superconductors (2011)
  • Author(s): Y.Kubozono, H.Mitamura, X.Lee, X.He, Y.Yamanari, Y.Takahashi, Y.Suzuki, Y.Kaji, R.Eguchi, K.Akaike, T.Kambe, H.Okamoto, A.Fujiwara, Takashi Kato, T.Kosugi, H.Aoki
  • Journal Title: Phys.Chem.Chem.Phys. Volume: 13 Issue: 37 Pages: 16476-16493
  • DOI: 10.1039/c1cp20961b
  • Peer Reviewed
• [Journal Article] The essential role of vibronic interactions in electron pairing in the micro- and macroscopic sized materials (2010)
  • Author(s): Takashi Kato
  • Journal Title: Chem.Phys. Volume: 376 Pages: 84-93
  • Peer Reviewed
• [Journal Article] Electronic structure of picene and K-doped solid picene : Nonrigid band change and its implication for electron-intramolecular-vibration interaction (2010)
  • Author(s): H.Okazaki, Y.Kubozono, T.Kambe, Takashi Kato, Takayoshi Yokoya, et al.
  • Journal Title: Phys.Rev.B Volume: 82 Pages: 195114-195114
  • Peer Reviewed
• [Journal Article] New method of accurate estimation of the electron-phonon coupling constants in fractionally charged incommensurate electronic states in molecular systems
  • Author(s): Takashi Kato
  • Journal Title: J.Chem.Phys. Volume: (in press)
  • Peer Reviewed
• [Journal Article] Strong intramolecular electron-phonon coupling in negatively charged aromatic superconductor picene
  • Author(s): Takashi Kato, Takashi Kambe, Yoshihiro Kubozono
  • Journal Title: Phys.Rev.Lett. Volume: (in press)
  • Peer Reviewed
• [Presentation] Vibronic Interactions and Their Applications to Solid State Physics and Chemistry (2011)
  • Author(s): Takashi Kato
  • Organizer: Seminar in Kyoto University
  • Place of Presentation: Kyoto University, Kyoto, Japan(招待講演)(invited)
  • Year and Date: 2011-12-22
• [Presentation] Vibronic Coupling Constants in Molecular Crystals : Towards High-Temperature Superconductivity (2011)
  • Author(s): Takashi Kato
  • Organizer: Seminar in Hokkaido University
  • Place of Presentation: Hokkaido University, Sapporo, Japan(招待講演)(invited)
  • Year and Date: 2011-12-12
• [Presentation] The Role of Electron-Phonon Interactions in Electron Pairing in Solid State MaterialsInternational Conference of New Science Created by Materials with Nano Spaces (2011)
  • Author(s): Takashi Kato
  • Organizer: International Conference of New Science Created by Materials with Nano Spaces
  • Place of Presentation: Tohoku Univeristy, Sendai, Japan
  • Year and Date: 2011-11-25
• [Presentation] Electron-Phonon Interactions and Superconductivity in the Negatively Charged Phenanthrene and Picene (2011)
  • Author(s): Takashi Kato
  • Organizer: International Conference of New Science Created by Materials with Nano Spaces
  • Place of Presentation: Tohoku Univeristy, Sendai, Japan
  • Year and Date: 2011-11-24
• [Presentation] Estimation of Electron-Phonon Coupling Constants in Molecular Crystals : Towards High-Temperature Superconductivity (2011)
  • Author(s): Takashi Kato
  • Organizer: Seminar in University of Paris
  • Place of Presentation: University of Paris, Paris, France(招待講演)(invited)
  • Year and Date: 2011-09-22
• [Presentation] ピセンにおける電子-フォノン相互作用と超伝導性 (2011)
  • Author(s): 加藤貴
  • Organizer: 2011「配列ナノ空間を利用した新物質科学ユビキタス元素戦略」特定領域研究会議
  • Place of Presentation: 大阪大学(大阪)
  • Year and Date: 2011-01-07
• [Presentation] 芳香族炭化水素系における超伝導性に関する理論的研究 (2010)
  • Author(s): 加藤貴、神戸高志、久保園芳博
  • Organizer: 第4回物性科学領域横断研究会
  • Place of Presentation: 東京大学(東京)
  • Year and Date: 2010-11-14
• [Presentation] ミクロな反磁性環電流とマクロな超伝導性との関連性に関する理論的研究 (2010)
  • Author(s): 加藤貴
  • Organizer: 第4回物性科学領域横断研究会
  • Place of Presentation: 東京大学(東京)
  • Year and Date: 2010-11-14
• [Presentation] Unified Theory of the Role of Vibronic Interactions in Micro- and Macroscopic Sized Superconductivity (2010)
  • Author(s): Takashi Kato
  • Organizer: 20th Jahn-Teller Conference
  • Place of Presentation: Univ.Frobourg, Switzerland(invited)
  • Year and Date: 2010-08-18
• [Presentation] Vibronic Interactions and Superconductivity in the Negatively Charged Picene (2010)
  • Author(s): Takashi Kato
  • Organizer: 20th Jahn-Teller Conference
  • Place of Presentation: Univ.Frobourg, Switzerland
  • Year and Date: 2010-08-18
• [Presentation] 配列ナノ空間における特異な物性の解明と高機能デバイス開発における振電効果の役割 (2010)
  • Author(s): 加藤貴
  • Organizer: 2010「配列ナノ空間を利用した新物質科学ユビキタス元素戦略」特定領域研究会議
  • Place of Presentation: 名古屋大学(名古屋)
  • Year and Date: 2010-05-30
• [Presentation] 振電相互作用と電子物性の関連性に関する理論的研究 (2010)
  • Author(s): 加藤貴
  • Organizer: 第13回理論化学討論会
  • Place of Presentation: 北海道大学(札幌)
  • Year and Date: 2010-05-25
• [Book] Jahn-Teller Effects (2012)
  • Author(s): Takashi Kato
  • Publisher: Springer, Heidelberg(印刷中)
• [Book] The effect of vibronic interaction on electronic properties and diamagnetic currents in the neutral H_2 molecules(Edited by Claude Daul)(in Jahn-Teller Effects) (2011)
  • Author(s): Takashi Kato
  • Publisher: Springer, Heidelberg(in press)