Electrical transport properties of fulleride superconductors in the vicinity of Mott transition

• Project/Area Number: 15K17690
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II
• Research Institution: Tohoku University
• Principal Investigator: Heguri Satoshi 東北大学, 原子分子材料科学高等研究機構, 助教 (70611648)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2015: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
• Keywords: フラーレン超伝導体 / 超伝導 / 磁性 / モット転移 / 電子相関 / 電気輸送特性 / 極端条件下物性 / 分子性固体 / 電機輸送特性 / フラーレン / 金属絶縁体転移 / オンサイトクーロン反発

Outline of Final Research Achievements

Eelectrical transport measurements have been very difficult in C60 superconductors and discussion has been made on a basis of experiments on magnetic probes. Temperature evolution of electrical resistivity of fcc fulleride superconductors RbxCs3-xC60 (0.35<x<3) is shown to be successfully measured under various pressure. Temperature dependence of electrical resistivity ranging from the Mott insulating state to a superconducting state via metallic phase was clearly observed. The profile of Mott insulator to metal boundary as a function of C603- volume was renewed and the different features of between the Jahn-Teller metal and the normal metal is not detected in the electrical transport measurements. In addition, on-site coulomb repulsion energy (U) is commented experimentally. We successfully demonstrated that the electronic states of fcc A3C60 system can be tuned systematically by the volume per C603- using the electrical transport measurements.

Research Products

• [Journal Article] Crossoever from localzed to itinerant states in hydrocarbon Mott insulators (2017)
  • Author(s): Q. T. N. Phan, S. Oikawa, S. Heguri, Y. Matsuda, K. Tanigaki
  • Journal Title: Dalton Transactions Volume: 印刷中 Issue: 19 Pages: 6433-6446
  • DOI: 10.1039/c6dt04851j
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Two different ground states in K-intercalated polyacenes (2016)
  • Author(s): Quynh T. N. Phan, Satoshi Heguri, Hiroyuki Tamura, Takehito Nakano, Yasuo Nozue, and Katsumi Tanigaki
  • Journal Title: Physical Review B Volume: 93 Issue: 7 Pages: 075130-075130
  • DOI: 10.1103/physrevb.93.075130
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] フラーレン超伝導体における金属-絶縁体クロスオーバー (2017)
  • Author(s): 松田祐貴, 平郡諭, 谷垣勝己
  • Organizer: 日本物理学会
  • Place of Presentation: 大阪大学
  • Year and Date: 2017-03-17
• [Presentation] 電子ドープされた芳香族化合物のバンド幅制御 (2017)
  • Author(s): 平郡 諭, Phan Thi Nhu Quynh, 及川新平, 松田祐貴, 谷垣勝己
  • Organizer: 日本物理学会
  • Place of Presentation: 大阪大学
  • Year and Date: 2017-03-17
• [Presentation] Kxpiceneの相と物性 (2017)
  • Author(s): 小林本忠, 平郡諭
  • Organizer: 日本物理学会
  • Place of Presentation: 大阪大学
  • Year and Date: 2017-03-17
• [Presentation] Crossover region revealed by electrical transport properties of fulleride superconductors (2017)
  • Author(s): Y. Matsuda, S. Heguri, K. Tanigaki
  • Organizer: American Physical Society
  • Place of Presentation: New Orleans（アメリカ）
  • Year and Date: 2017-03-12
  • Int'l Joint Research
• [Presentation] Two Different Ground States in K-Doped Polycenes (2017)
  • Author(s): S. Heguri, Q. T. N. Phan, H. Tamura, T. Nakano, Y. Nozue, K. Tanigaki
  • Organizer: American Physical Society
  • Place of Presentation: New Orleans（アメリカ）
  • Year and Date: 2017-03-12
  • Int'l Joint Research
• [Presentation] Magnetotransport properties of BaMn2Pn2 compounds (2017)
  • Author(s): K. K. Khung, K. Kitahara, T. Ogasawara, S. Heguri, Y. Tanabe, K. Tanigaki
  • Organizer: American Physical Society
  • Place of Presentation: New Orleans（アメリカ）
  • Year and Date: 2017-03-12
  • Int'l Joint Research
• [Presentation] Crossover from localized to itinerant states in hydrocarbon Mott insulators (2017)
  • Author(s): S. Heguri, Q. T. N. Phan, S. Oikawa, Y. Matsuda, K. Tanigaki
  • Organizer: The AIMR International Symposium 2017
  • Place of Presentation: 仙台国際センター
  • Year and Date: 2017-02-13
  • Int'l Joint Research
• [Presentation] C60分子の特異な磁化率 (2016)
  • Author(s): 平郡 諭, 下谷秀和, P. T. N. Quynh, 松田祐貴, 櫻井英博, 谷垣 勝己
  • Organizer: 炭素材料学会
  • Place of Presentation: 千葉大学
  • Year and Date: 2016-12-07
• [Presentation] 電子ドープされた直鎖状炭化水素における異なる2つの基底状態 (2016)
  • Author(s): 平郡 諭, Phan T. N. Quynh, 田村宏之, 中野岳仁, 野末泰夫, 谷垣 勝己
  • Organizer: 炭素材料学会
  • Place of Presentation: 千葉大学
  • Year and Date: 2016-12-07
• [Presentation] Metal to insulator boundary of expanded f.c.c. C60 superconductor (2016)
  • Author(s): Y. Matsuda, S. Heguri, K. Tanigaki
  • Organizer: APPC-AIP
  • Place of Presentation: Brisbane（アメリカ）
  • Year and Date: 2016-12-04
  • Int'l Joint Research
• [Presentation] Pressure effect on Mott Insulator K1AN (2016)
  • Author(s): S. Oikawa, S. Heguri, Q T. N. Phan, Y. Matsuda, K. Tanigaki
  • Organizer: APPC-AIP
  • Place of Presentation: Brisbane
  • Year and Date: 2016-12-04
  • Int'l Joint Research
• [Presentation] 極端条件下光学及び輸送特性の同時観察技術の開拓による分子超伝導体の電子状態解明 (2016)
  • Author(s): 伊藤桂介, 平郡諭
  • Organizer: 東北大学付置研究所若手アンサンブル研究会
  • Place of Presentation: 気仙沼プラザホテル
  • Year and Date: 2016-10-31
• [Presentation] フラーレン超伝導体における圧力下電気輸送特性 (2016)
  • Author(s): 松田祐貴, 平郡諭, 松田祐樹,谷垣勝己
  • Organizer: 日本物理学会
  • Place of Presentation: 金沢大学
  • Year and Date: 2016-09-13
• [Presentation] Π電子系分子固体の構造と電子状態 (2016)
  • Author(s): 平郡諭
  • Organizer: 日本物理学会
  • Place of Presentation: 金沢大学
  • Year and Date: 2016-09-13
  • Invited
• [Presentation] C60分子の特異な磁化率 (2016)
  • Author(s): 平郡 諭, 下谷秀和, Phan Thi Nhu Quynh,松田祐貴, 櫻井英博, 谷垣勝己
  • Organizer: 日本物理学会
  • Place of Presentation: 金沢大学
  • Year and Date: 2016-09-13
• [Presentation] Two different ground states in K-doped polyacenes (2016)
  • Author(s): S. Heguri, Q. T. N. Phan, H. Tamura, T. Nakano, Y. Nozue, K. Tanigaki
  • Organizer: The 15th International Conference on Molecule-Based Magnets
  • Place of Presentation: 仙台国際センター
  • Year and Date: 2016-09-04
  • Int'l Joint Research
• [Presentation] Two Different Ground States in K-Doped Polyacenes (2016)
  • Author(s): S. Heguri
  • Organizer: Gordon Research Conference
  • Place of Presentation: Mount Holyoke College（アメリカ）
  • Year and Date: 2016-08-14
  • Int'l Joint Research / Invited
• [Presentation] Metal to insulator boundary of expanded f.c.c. C60 superconductor (2016)
  • Author(s): Y. Matsuda, S. Heguri, K. Tanigaki
  • Organizer: Gordon Research Conference
  • Place of Presentation: Mount Holyoke College（アメリカ）
  • Year and Date: 2016-08-14
  • Int'l Joint Research
• [Presentation] Two Different Ground States in K-Doped Polyacenes (2016)
  • Author(s): S. Heguri, Q. T. N. Phan, H. Tamura, T. Nakano, Y. Nozue, K. Tanigaki
  • Organizer: Gordon Research Seminar
  • Place of Presentation: Mount Holyoke College
  • Year and Date: 2016-08-13
  • Int'l Joint Research
• [Presentation] Metal to insulator boundary of expanded f.c.c. C60 superconductor (2016)
  • Author(s): Y. Matsuda, S. Heguri, K. Tanigaki
  • Organizer: Gordon Research Seminar
  • Place of Presentation: Mount Holyoke College（アメリカ）
  • Year and Date: 2016-08-13
  • Int'l Joint Research
• [Presentation] Mott転移近傍におけるフラーレン超伝導体の電気輸送特性 (2016)
  • Author(s): 平郡諭, 松田祐貴, 谷垣勝己
  • Organizer: 物性研短期研究会「π電子系物性科学の最前線」
  • Place of Presentation: 東京大学物性研究所
  • Year and Date: 2016-08-08
• [Presentation] Advancedクロモノ科学 (2016)
  • Author(s): 平郡諭
  • Organizer: 第二回東北大学付置研究所若手アンサンブルワークショップ
  • Place of Presentation: 東北大学金属材料研究所
  • Year and Date: 2016-07-12