Investigation on dynamics of organic conductors by cooperative use of pulsed neutron and muon

• Project/Area Number: 23600012
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Quantum beam science
• Research Institution: Japan Atomic Energy Agency
• Principal Investigator: KAWAMURA Seiko 独立行政法人日本原子力研究開発機構, 原子力科学研究部門 J-PARCセンター, 副主任研究員 (70360518)
• Co-Investigator(Renkei-kenkyūsha): KATO Reizo 独立行政法人理化学研究所, 加藤分子物性研究室, 主任研究員 (80169531) ; TANIGUCHI Hiromi 埼玉大学, 理工学研究科, 准教授 (50323374) ; SATOH Kazuhiko 埼玉大学, 理工学研究科, 教授 (60225927)
• Project Period (FY): 2011-04-28 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000); Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); 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: 分子性導体 / 中性子非弾性散乱 / 中性子散乱

Outline of Final Research Achievements

In this research, we aimed to apply inelastic neutron scattering (INS) measurement to studies on dynamics in the organic conductors using a chopper spectrometer installed at J-PARC.
We succeeded observation of a full picture of the phonon spectrum in an organic conductor, beta'-(BEDT-TTF)2ICl2, by INS for the first time. It was found there that a low-energy optical mode is strongly coupled with the charge and spin degrees of freedom. We also tried direct observation of magnetic excitation in this material. However, we have not yet succeeded its observation because the magnetic intensity rapidly decreases due to the spin widely distributed on a molecule.

Research Products

• [Journal Article] Spin-Orbit Fluctuations in Frustrated Heavy-Fermion Metal LiV2O4 (2014)
  • Author(s): K. Tomiyasu, K. Iwasa, H. Ueda, S. Niitaka, H. Takagi, S. Ohira-Kawamura, T. Kikuchi, Y. Inamura, K. Nakajima, and K. Yamada
  • Journal Title: Phys. Rev. Lett. Volume: 113 Issue: 23 Pages: 236402-236402
  • DOI: 10.1103/physrevlett.113.236402
  • Peer Reviewed
• [Journal Article] Spin-Nematic Interaction in the Multiferroic Compound Ba2CoGe2O7 (2014)
  • Author(s): M. Soda, M. Matsumoto, M. Mansson, S. Ohira-Kawamura, K. Nakajima, R. Shiina, and T. Masuda
  • Journal Title: Phys. Rev. Lett Volume: Vol. 112 Issue: 12 Pages: 127205-127205
  • DOI: 10.1103/physrevlett.112.127205
  • Peer Reviewed
• [Journal Article] Mode-distribution analysis of quasielastic neutron scattering and application to liquid water (2013)
  • Author(s): T. Kikuchi, K. Nakajima, S. Ohira-Kawamura, Y. Inamura, O. Yamamuro, M. Kofu, Y. Kawakita, K. Suzuya, M. Nakamura and M. Arai
  • Journal Title: Phys. Rev. E Volume: 87 Issue: 6
  • DOI: 10.1103/physreve.87.062314
  • Peer Reviewed
• [Journal Article] Hyperfine structure of magnetic excitations in a Tb-based single-molecule magnet studied by high-resolution neutron spectroscopy (2013)
  • Author(s): M. Kofu, O. Yamamuro, T. Kajiwara, Y. Yoshimura, M. Nakano, K. Nakajima, S. Ohira-Kawamura, T. Kikuchi and Y. Inamura
  • Journal Title: Phys. Rev. B Volume: 88
  • Peer Reviewed
• [Journal Article] Recent improvement of the signal-to-noise ratio on the Fermi chopper spectrometer 4SEASONS (2013)
  • Author(s): R. Kajimoto, M. Nakamura, Y. Inamura, K. Ikeuchi, S. Ji, K. Nakajima, S. Ohira-Kawamura, W. Kambara, M. Sawabe, A. Kamiya, K. Inoue, T. Futagami, M. Kobayashi, A. Kishi, K. Satou, K. Aizawa and M. Arai
  • Journal Title: J. Phys. Soc. Jpn. Volume: 82 Issue: Suppl.A Pages: SA032-SA032
  • DOI: 10.7566/jpsjs.82sa.sa032
  • Peer Reviewed
• [Journal Article] Magnetic relaxations in a Tb-based single molecule magnet studied by quasielastic neutron scattering (2013)
  • Author(s): M. Kofu, T. Kajiwara, J. S. Gardner, G. G. Simeoni, M. Tyagi, A.Faraone, K. Nakajima, S. Ohira-Kawamura, M. Nakano, O. Yamamuro
  • Journal Title: Chemical Physics Volume: 427 Pages: 147-152
  • DOI: 10.1016/j.chemphys.2013.10.004
  • Peer Reviewed
• [Journal Article] Well-defined crystal field splitting schemes and non-Kramers doublet ground states of f electrons in PrT2Zn20 (T=Ir, Rh, and Ru) (2013)
  • Author(s): K. Iwasa
  • Journal Title: J. Phys. Soc. Jpn. Volume: 82 Issue: 4 Pages: 043707-043707
  • DOI: 10.7566/jpsj.82.043707
  • Peer Reviewed
• [Journal Article] Effects of Mg, Ag, and Al substitutions on magnetic excitations in the triangular-lattice antiferromagnet CuCrO2 (2013)
  • Author(s): R. Kajimoto, K. Nakajima, S. Ohira-Kawamura, Y. Inamura, K. Kakurai, T. Hokazono, S. Oozono and T. Okuda
  • Journal Title: J. Phys. Soc. Jpn. Volume: 82 Issue: 5 Pages: 054702-054702
  • DOI: 10.7566/jpsj.82.054702
  • Peer Reviewed
• [Journal Article] Quasi-elastic neutron scattering of dense molecular liquid selenium bromide (2012)
  • Author(s): H. Shimakura, Y. Kawakita, Y. Inamura, T. Kikuchi, H. Ueno, M. Nakamura, K. Nakamura, S. Ohira-Kawamura, K. Shibata, M. Arai and S. Takeda
  • Journal Title: J. Phys: Conf. Ser. Volume: 340 Pages: 012080-012080
  • DOI: 10.1088/1742-6596/340/1/012080
  • Peer Reviewed
• [Journal Article] Neutron scattering study of Ag, Mg and Al substitution effects on the magnetic excitations in CuCrO2 (2012)
  • Author(s): R. Kajimoto, K. Nakajima, S. Ohira-Kawamura, Y. Inamura, K. Kakurai, M. Arai, T. Hokazono, S. Oozono and T. Okuda
  • Journal Title: J. Phys. Conf. Ser. Volume: 400 Issue: 3 Pages: 032034-032034
  • DOI: 10.1088/1742-6596/400/3/032034
  • Peer Reviewed
• [Journal Article] Magnetic and non-magnetic phases of a quantum spin liquid (2011)
  • Author(s): F. L. Pratt, P. J. Baker, S. J. Blundell, T. Lancaster, S. Ohira-Kawamura, C. Baines, Y. Shimizu, K. Kanoda, I. Watanabe and G. Saito
  • Journal Title: Nature Volume: 471 Pages: 612-616
  • Peer Reviewed
• [Journal Article] ToF inelastic neutron scattering studies on quantum spin systems (CuCl)LaB2O7 (B = Nb, Ta) (2011)
  • Author(s): S. Ohira-Kawamura, K. Nakajima, Y. Inamura, Y. Tsujimoto, A. Kitada, F. Takeiri, H. Kageyama, Y. Ajiro, M. Nishi and K. Kakurai
  • Journal Title: J. Phys.: Conf. Ser. Volume: 320
  • Peer Reviewed
• [Journal Article] The Fermi chopper spectrometer 4SEASONS at J-PARC (2011)
  • Author(s): R. Kajimoto, M. Nakamura, Y. Inamura, F. Mizuno, K. Nakajima, S. Ohira-Kawamura, T. Yokoo, T. Nakatani, R. Maruyama, K. Soyama, K. Shibata, K. Suzuya, S. Sato 他10名
  • Journal Title: J. Phys. Soc. Jpn. Volume: 80
  • Peer Reviewed
• [Journal Article] AMATERAS : A cold-neutron disk chopper spectrometer (2011)
  • Author(s): K. Nakajima, S. Ohira-Kawamura, T. Kikuchi, M. Nakamura, R. Kajimoto, Y. Inamura, N. Takahashi, K. Aizawa, K. Suzuya, K. Shibata, T. Nakatani, K. Soyama, R. Maruyama 他13名
  • Journal Title: J. Phys. Soc. Jpn. Volume: 80
  • NAID: 130007516674
  • Peer Reviewed
• [Presentation] Phonon Modes in a Molecular Dimer-Mott Insulator Studied by Inelastic Neutron Scattering (2014)
  • Author(s): (3)S. Ohira-Kawamura, M. Matsuura, S. Iguchi, T. Sasaki, H. Taniguchi, A. Kubota, K. Satoh, Y. Inamura, T. Kikuchi and K. Nakajima
  • Organizer: 2nd International Symposium of J-PARC (J-PARC2014)
  • Place of Presentation: Tsukuba, Japan
  • Year and Date: 2014-07-13 – 2014-07-15
• [Presentation] Impurity-induced effect on a spin-Peierls compound TiOBr (2014)
  • Author(s): (4)S. Ohira-Kawamura, S. Kuroiwa, H. Kawashima, M. Yamazawa, R. Kadono, K. Ohishi and J. Akimitsu
  • Organizer: The 13th International Conference on Muon Spin Rotation, Relaxation and Resonance (μSR2014)
  • Place of Presentation: Grindelwald, Switzerland
  • Year and Date: 2014-06-01 – 2014-06-06
• [Presentation] Inelastic neutron scattering study on phonon spectra in dimer-Mott insulator β’-(BEDT-TTF)2ICl2 (2013)
  • Author(s): S. Ohira-Kawamura, M. Matsuura, S. Iguchi, T. Sasaki, H. Taniguchi, A. Kubota, K. Satoh, Y. Inamura, T. Kikuchi, Y. Kawakita and K. Nakajima
  • Organizer: The 10th International Symposium on Crystalline Organic Metals Superconductors and Ferromagnets (ISCOM2013)
  • Place of Presentation: Montreal (Canada)
• [Presentation] 中性子非弾性散乱によるダイマーモット絶縁体β'-(BEDT-TTF)2ICl2のフォノン異常の観測 (2013)
  • Author(s): 河村聖子、松浦直人、井口敏、佐々木孝彦、谷口弘三、窪田愛子、佐藤一彦、稲村泰弘、菊地龍弥、川北至信、中島健次
  • Organizer: 日本物理学会2013年秋季大会
  • Place of Presentation: 徳島大学三島キャンパス（徳島県徳島市）
• [Presentation] 有機ダイマーモット絶縁体β'-(BEDT-TTF)2ICl2におけるフォノン異常 (2013)
  • Author(s): 河村聖子、松浦直人、井口敏、佐々木孝彦、谷口弘三、窪田愛子、佐藤一彦、稲村泰弘、菊地龍弥、川北至信、中島健次
  • Organizer: 日本中性子科学会年会
  • Place of Presentation: ちば県民プラザ（千葉県柏市）
• [Presentation] Current status of sample environment in MLF J-PARC (2012)
  • Author(s): S. Ohira-Kawamura, W. Kambara, Y. Yamauchi, T. Yokoo, K. Munakata, Y. Kawakita, T. Nakatani, S. Torii, R. Kajimoto, K. Nakajima, K. Kaneko, S. Takata, H. Nojiri, Y. Narumi and M. Arai
  • Organizer: 7th International Workshop on Sample Environment at Neutron Scattering Facilities
  • Place of Presentation: Sydney (Australia)
• [Presentation] Phonon modes reflecting ferroelectricity in β’-(BEDT-TTF)2ICl2 studied by inelastic neutron scattering (2012)
  • Author(s): S. Ohira-Kawamura, M. Matsuura, S. Iguchi, T. Sasaki, H. Taniguchi, T. Kikuchi and K. Nakajima
  • Organizer: International Symposium on Materials Science Opened by Molecular Degrees of Freedom (MDF2012)
  • Place of Presentation: Miyazaki (Japan)
• [Presentation] Towards observation of magnetic excitation in organic conductor (2011)
  • Author(s): S. Ohira-Kawamura, K. Nakajima, Y. Inamura, T. Kikuchi and H. Taniguchi
  • Organizer: 1st Asia-Oceania Conference of Neutron Scattering (AOCNS)
  • Place of Presentation: Tsukuba (Japan)
• [Presentation] Current status and future plan of sample environment in MLF, J-PARC (2011)
  • Author(s): S. Ohira-Kawamura, T. Yokoo, W. Kambara, K. Munakata, R. Kajimoto, T. Nakatani, K. Kaneko, Y. Kawakita, S. Takata, K. Nakajima, S. Torii, Y. Yamauchi, J. Suzuki (他6名)
  • Organizer: 1st Asia-Oceania Conference of Neutron Scattering (AOCNS)
  • Place of Presentation: Tsukuba (Japan)