anomalous metal-insulator transition induced by correlated molecule

• Project/Area Number: 18K03532
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
• Research Institution: Osaka Institute of Technology
• Principal Investigator: heguri satoshi 大阪工業大学, 工学部, 准教授 (70611648)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2018: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: 金属絶縁体転移 / 分子性固体 / 強相関電子系 / 超伝導 / 電気輸送特性 / 極端条件下物性 / フラーレン化合物 / 圧力下物性 / 圧力 / 電子相関

Outline of Final Research Achievements

There have been no reports about the electrical transport measurements of fullerides and the discussion has been made on a basis of magnetic measurements. Temperature dependence of electrical resistivity of expanded fcc C603- states carried out under high pressure. The profile of Mott insulating state to superconducting state via normal metallic state was observed. In addition, we revealed that anomalous features strongly coupled with the degree of freedom of C60 molecule.

Academic Significance and Societal Importance of the Research Achievements

モット転移の研究が始まって半世紀以上が経つ現在でも、モット転移やその臨界現象が実験的に調べ議論され始めたのは近年のことである。
本研究では比較的低圧で電子状態を制御可能なバンド幅制御型モット絶縁体である面心立方格子の分子を用いて、銅酸化物でも見られる異常な金属状態の起源と、分子自由度と電子相関が密接に絡み合った系における金属絶縁体転移の性質を実験的に明らかにした。

Research Products

• [Journal Article] Carrier-doped aromatic hydrocarbons: a new platform in condensed matter chemistry and physics (2018)
  • Author(s): satoshi heguri, katsumi tanigaki
  • Journal Title: dalton transactions Volume: 47 Issue: 9 Pages: 2881-2895
  • DOI: 10.1039/c7dt03745g
  • Peer Reviewed / Open Access
• [Journal Article] 電子ドープされた芳香族分子の基底状態 (2018)
  • Author(s): 平郡 諭
  • Journal Title: 炭素 Volume: 284 Pages: 151-163
  • NAID: 130007491839
  • Peer Reviewed
• [Presentation] 黒鉛層間化合物の超伝導と磁性 (2020)
  • Author(s): 平郡諭
  • Organizer: 炭素材料第117委員会
• [Presentation] Design of the sodium ionic conductor for all-solid-state battery (2020)
  • Author(s): Kazuyuki Kawahara, Satsohi Heguri
  • Organizer: APS March Meeting 2020
  • Int'l Joint Research
• [Presentation] Exotic states of carbon based materials (2019)
  • Author(s): 平郡 諭
  • Organizer: 炭素材料学会
  • Invited
• [Presentation] 芳香族モット絶縁体における物理的圧力効果 (2018)
  • Author(s): 平郡 諭
  • Organizer: 炭素材料学会