microscopic study of metal-nonmetal transition in the molecular based p-d system

• Project/Area Number: 23540423
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Gakushuin University
• Principal Investigator: HIRAKI Ko-ichi 学習院大学, 理学部, 助教 (00306523)
• Co-Investigator(Renkei-kenkyūsha): TAKAHASHI Toshihiro 学習院大学, 理学部, 教授 (60163276)
• Project Period (FY): 2011-04-28 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000); Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2012: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2011: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: p-d相互作用 / 分子性伝導体 / 金属-絶縁体転移 / 磁場誘起超伝導 / NMR / 金属絶縁体転移 / 国際研究者交流（フランス） / 磁場有機超伝導 / BETS / スピンダイナミクス

Outline of Final Research Achievements

The roles of π-d interaction in the organic BETS based conductor, λ-BETS2FeCl4 system which shows a metal-superconductor transition at high magnetic field/a metal-insulator transition at low field, were microscopically investigated by NMR technique. The exchange interaction between itinerant π spin and ``dilute" d spins in the Ga doping system was clarified by analysis of NMR spectra. The temperature dependences of NMR spectra and relaxation, it has been clarified that the p spin contribute to the antiferromagnetically ordered insulating state at the lower magnetic field region.

Research Products

• [Journal Article] Antiferromagnetic Ordering in Quasi-Triangular Localized Spin System, β -Et2Me2P[Pd(dmit)2]2, Studied by 13CNMR (2014)
  • Author(s): K. Otsuka, H. Iikubo, T. Kogure, Y. Takano, K. Hiraki, T. Takahashi, H. B. Cui, and R. Kato
  • Journal Title: Journal of the Physical Society of Japan Volume: 83 Issue: 5 Pages: 054712-054712
  • DOI: 10.7566/jpsj.83.054712
  • NAID: 210000133089
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] l-BETS2FeCl4の低磁場領域でのNMR研究 (2014)
  • Author(s): 開康一、高橋利宏，中村敏和，周彪，加藤礼三
  • Organizer: 日本物理学会2014年度秋季大会
  • Place of Presentation: 中部大学 (春日井市)
  • Year and Date: 2014-09-09
• [Presentation] Site-Selective NMR Study on an Organic-Inorganic Hybrid Compound (DI-DCNQI)2Cu with p-d Mixing Controlled by Pressure (2014)
  • Author(s): 宮川和也、中山周、開康一,高橋利宏、鹿野田一司
  • Organizer: The "International Conference on Strongly Correlated Electron Systems (SCES2014)
  • Place of Presentation: St. Martin d'Heres, France
  • Year and Date: 2014-07-07 – 2014-07-11
• [Presentation] NMR study on the Low field Antiferromagnetic Insulating State of the BETS based Field Induced Organic Superconductor (2014)
  • Author(s): 開康一、高橋利宏、中村敏和、周彪，加藤礼三
  • Organizer: The "International Conference on Science and Technology of Synthetic Metals 2014" (ICSM 2014)
  • Place of Presentation: Turku, Finland
  • Year and Date: 2014-06-30 – 2014-07-05
• [Presentation] Se-NMR study on l-type BETS based Field Induced Superconductor (2013)
  • Author(s): 開康一、北原昌嗣、高橋利宏、秋場宙、西尾豊、B. Zhou、小林昭子、小林速男
  • Organizer: International Symposium on Crystalline Organic Metals, Superconductors and Magnets
  • Place of Presentation: Montreal, Canada
• [Presentation] Microscopic Se-NMR Studies of the Field Induced Superconducting System, l-(BETS)2(Fe1-xGax)Cl4 (2012)
  • Author(s): 開康一、北原昌嗣、高橋利宏、秋葉宙、西尾豊、B. Zhou、小林昭子、小林速男
  • Organizer: International Conference on Science and Technology of Synthetic Metals 2012
  • Place of Presentation: Atlanta (米国)
• [Presentation] Se-NMR study on l-type BETS based Field Induced Superconductor (2012)
  • Author(s): 開康一、北原昌嗣、高橋利宏、秋葉宙、西尾豊、B. Zhou、小林昭子、小林速男
  • Organizer: International Symposium on Materials Science Opened by Molecular Degrees of Freedom
  • Place of Presentation: 宮崎県
• [Presentation] l-(BETS)2Fe1-xGaxCl4系のNMR研究IV (2012)
  • Author(s): 開康一、北原昌嗣、高橋利宏、秋葉宙、西尾豊、B. Zhou、小林昭子、小林速男
  • Organizer: 日本物理学会2012年度秋季大会
  • Place of Presentation: 神奈川県
• [Presentation] {\lambda}-(BETS)_2_$Fe_1-x_Ga_x_Cl_4_系の^77^Se NMR研究 III (2011)
  • Author(s): 開康一
  • Organizer: 日本物理学会2011年度秋期大会
  • Place of Presentation: 富山大学(富山市)
• [Presentation] Exchange interaction between conduction p and localized d spins field induced superconductor, l-(BETS)2>Fe1-xGaxCl4 (2011)
  • Author(s): 開康一
  • Organizer: International Symposium on Crystalline Organic Metals, Superconductors and Magnets (ISCOM2011)
  • Place of Presentation: Gniezno, (Poland