Unconventional electronic state near field induced superconductivity

2008 Fiscal Year Final Research Report

• Project/Area Number: 19740200
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: The Institute of Physical and Chemical Research (2008); The University of Tokyo (2007)
• Principal Investigator: FUJIYAMA Shigeki The Institute of Physical and Chemical Research, 高木磁性研究室, 専任研究員 (00342634)
• Project Period (FY): 2007 – 2008
• Keywords: 有機導体 / 磁場誘起超伝導 / 磁性

Research Abstract

近年、分子性導体は新たな強相関電子系研究の舞台として認識されている。特に、分子性導体において見いだされた磁場誘起超伝導は、伝導電子と局在スピンの間の反強磁性的交換相互作用の存在を強く示唆し、有機導体研究の新たな潮流となっている。本課題では、金属層と絶縁体層が交互積層した有機導体(Me-3,5-DIP)[Ni(dmit)_2]_2をとりあげ、局在的性格を持つπ電子と遍歴π電子の交換相互作用が極めて強いために、遍歴電子磁化率が低温で抑制されていることを発見した。

Research Products

• [Journal Article] Suppression of electronic susceptibility in metal-Mott insulator alternating material, (Me-3,5-DIP)[Ni(dmit)_2]_2 (2008)
  • Author(s): S. Fujiyama, A. Shitade, K. Kanoda, Y. Kosaka, H. M. Yamamoto, R. Kato,
  • Journal Title: Phys. Rev. B rapid comm. 77 Pages: 060403(R)
  • Peer Reviewed
• [Journal Article] Neutral-Ionic phase transition in DMTTF-QCl_4 investigated by ^<35>Cl NQR (2007)
  • Author(s): F. Iwase, K. Miyagawa, S. Fujiyama, K. Kanoda, S. Horiuchi, Y. Tokura
  • Journal Title: J. Phys. Soc. Jpn. 76 Pages: 073701
  • Peer Reviewed
• [Presentation] Quantum spin liquid state with strong LS coupling (2009)
  • Author(s): 藤山茂樹
  • Organizer: Emergent Phenomena of Correlated Materials
  • Place of Presentation: Okinawa
  • Year and Date: 20090300
• [Presentation] LS separation of J=1/2 Mott insulator observed by magnetic X-ray diffraction (2009)
  • Author(s): 藤山茂樹
  • Organizer: American Physical Society March Meeting
  • Place of Presentation: Pittsubrugh
  • Year and Date: 20090300
• [Presentation] Unconventional J=1/2 state in 5d transition metal oxide (2009)
  • Author(s): 藤山茂樹
  • Organizer: International Workshop on Quantum Critical Phenomena and Novel Phases in Superclean Materials, invited
  • Place of Presentation: Hawaii, USA
  • Year and Date: 20090100
• [Presentation] Spin excitation spectra of Hyper-Kagome Na4 Ir3 O8 (2008)
  • Author(s): 藤山茂樹
  • Organizer: Hong-Kong Forum of Physics, inveted
  • Place of Presentation: Hong-Kong
  • Year and Date: 20081200
• [Presentation] Magnetic X-ray scattering of spin-orbital strongly coupled antiferromagnet, Sr2IrO4 (2008)
  • Author(s): 藤山茂樹
  • Organizer: Workshop on Inelastic Neutron and X-Ray Scattering in Strongly Correlated Electron Systems, invited
  • Place of Presentation: Sendai
  • Year and Date: 20081000
• [Presentation] Spin Dynamics of Hyper-Kagome Iridate (2008)
  • Author(s): 藤山茂樹
  • Organizer: JST研究会
  • Place of Presentation: 湘南国際村
  • Year and Date: 20080300
• [Presentation] 三次元ハイパーカゴメNa_4Ir_3O_8のNMR (2008)
  • Author(s): 藤山茂樹
  • Organizer: 「異常量子物質の創成」研究会
  • Place of Presentation: 名古屋大学
  • Year and Date: 20080100
• [Presentation] ハイパーカゴメNa4Ir3O8の磁気励起 (2008)
  • Author(s): 藤山茂樹
  • Organizer: 「フラストレーションが創る新しい物性」研究会
  • Place of Presentation: 京都大学
  • Year and Date: 20080100
• [Presentation] Spin dynamics in the hyperkagome system (2007)
  • Author(s): 藤山茂樹
  • Organizer: 理化学研究所研究会
  • Place of Presentation: 理研
  • Year and Date: 20071200
• [Presentation] ハイパーカゴメNa_4Ir_3O_8のNMR (2007)
  • Author(s): 藤山茂樹
  • Organizer: 日本物理学会
  • Place of Presentation: 北海道大学
  • Year and Date: 20070900
• [Presentation] Pseudogap behavior in Ni(dmit)_2 based organic conductor (2007)
  • Author(s): 藤山茂樹
  • Organizer: AIST international Workshop
  • Place of Presentation: 秋葉原
  • Year and Date: 20070500
• [Presentation] (Me-3,5-DIP)[Ni(dmit)2]2の13 C NMR (2007)
  • Author(s): 藤山茂樹
  • Organizer: 日本物理学会
  • Place of Presentation: 鹿児島市
  • Year and Date: 20070300
• [Presentation] モット絶縁体-金属交互積層系(Me-3,5-DIP)[Ni(dmit)_2]_2の^<13>C NMR (2007)
  • Author(s): 藤山茂樹
  • Organizer: 新しい環境下における分子性導体の特異な機能の探索
  • Place of Presentation: 北海道大学
  • Year and Date: 20070100