Dynamical Structures in Hole-doped 1D Quantum Spin Chains

• Project/Area Number: 26400376
• 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: High Energy Accelerator Research Organization
• Principal Investigator: Yokoo Tetsuya 大学共同利用機関法人高エネルギー加速器研究機構, 物質構造科学研究所, 准教授 (10391707)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: 量子スピン系 / 低次元磁性 / ハルデンギャップ / 中性子非弾性散乱 / 量子スピン / スピンギャップ / ハルデン状態 / 量子ビーム / 中性子散乱

Outline of Final Research Achievements

Spin and hole dynamics in one-dimensional (1D) quantum spin chains were investigated by means of pulse neutron inelastic scattering technique. The large and high quality single crystals of Nd2-xCaxBaNiO5 known as a hole-doped 1D Haldane system were grown by floating zone method. Three different hole content, namely x=0, 0.035 and 0.1, were used for neutron experiments. Using high energy neutrons, the entire dispersion curves in the Brillouin zone has been ovserved including Haldane gap at the zone center. Also, new states being relevant to the hole-doping appear below the Haldane gap, and they show incommensurate structure centered at the zone center. This is closely related to the motion of the doped holes. It is also noted that the observed dynamical structures are very much similar to that is observed in high-Tc superconductors, where the dynamical motion of the arrangement of spins and holes play an essential role to realize the superconductivity.

Research Products

• [Journal Article] Science from the Initial Operation of HRC (2015)
  • Author(s): S. Itoh, T. Yokoo, T. Masuda, H. Yoshizawa, M. Soda, Y. Ikeda, S. Ibuka, D. Kawana, T. J. Sato, Y. Nambu, K. Kuwahara, S. Yano, J. Akimitsu, Y. Kaneko, Y. Tokura, M. Fujita, M. Hase, K. Iwasa, H. Hiraka, T. Fukuda, K. Ikeuchi, K. Yoshida, T. Yamaguchi, K. Ono, Y. Endoh
  • Journal Title: JPS Conference Proceedings Volume: 8 Pages: 1-6
  • Peer Reviewed
• [Journal Article] Polarized Neutron Spectrometer for Inelastic Experiments at J-PARC: Status of POLANO Project (2015)
  • Author(s): T. Yokoo, K. Ohoyama, S. Itoh, K. Iwasa, N. Kaneko, J. Suzuki, M. Ohkawara, K. Aizawa, S. Tasaki, T. Ino, K. Taketani, S. Ishimoto, M. Takeda, T. Oku, H. Kira, K. Hayashi, H. Kimura, T. J. Sato
  • Journal Title: EPJ Web of Conferences Volume: 83 Pages: 03018-03018
  • Peer Reviewed
• [Journal Article] Spin and Hole Dynamics in Carrier Doped Quantum Haldane Chain (2014)
  • Author(s): T. Yokoo, S. Itoh, S. Ibuka, H. Yoshizawa and J. Akimitsu
  • Journal Title: J. Phys.: Conf. Series Volume: 568 Issue: 4 Pages: 1-4
  • DOI: 10.1088/1742-6596/568/4/042035
  • Peer Reviewed / Open Access
• [Journal Article] Experimental confirmation of spin gap in antiferromagnetic alternating spin-3/2 chain substances RCrGeO5 (R = Y or 154Sm) by inelastic neutron scattering experiments (2014)
  • Author(s): Masashi Hase, Minoru Soda, Takatsugu Masuda, Daichi Kawana, Tetsuya Yokoo, Shinichi Itoh, Akira Matsuo, Koichi Kindo, and Masanori Kohno
  • Journal Title: Phys. Rev. B Volume: 90 Issue: 2 Pages: 024416-024416
  • DOI: 10.1103/physrevb.90.024416
  • Peer Reviewed
• [Journal Article] Observation of spin-wave dispersion in Nd-Fe-B magnets using neutron Brillouin scattering (2014)
  • Author(s): K. Ono, N. Inami, K. Saito, Y. Takeichi, M. Yano, T. Shoji, A. Manabe, A. Kato, Y. Kaneko, D. Kawana, T. Yokoo , and S. Itoh
  • Journal Title: J. Appl. Phys. Volume: 115 Issue: 17 Pages: 1-3
  • DOI: 10.1063/1.4863380
  • Peer Reviewed
• [Journal Article] Concepts of Neutron Polarisation Analysis Devices for a New Neutron Chopper Spectrometer, POLANO, in J-PARC (2014)
  • Author(s): K. Ohoyama, T. Yokoo, S. Itoh, T. Ino, M. Ohkawara, T. Oku, S. Tasaki, K. Iwasa, T. J. Sato, S. Ishimoto, K. Taketani, H. Kira, Y. Sakaguch, M. Nanbu, H. Hiraka, H. M. Shimizu, M. Takeda, M. Hino, K. Hayashi, M. Kenzelmann, U. Fliges, P. Hautle
  • Journal Title: J. Phys.: Conf. Series Volume: 502 Pages: 1-4
  • DOI: 10.1088/1742-6596/502/1/012051
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Dynamical properties of spins and holes in carrier doped quantum Haldane chain (2014)
  • Author(s): T. Yokoo, S. Itoh, D. Kawana, H. Yoshizawa, and J. Akimitsu
  • Journal Title: J. Phys.: Conf. Series Volume: 502 Pages: 1-4
  • DOI: 10.1088/1742-6596/502/1/012045
  • Peer Reviewed / Open Access
• [Journal Article] Spin Waves in Ferromagnetic Phase of MnP (2014)
  • Author(s): S. Itoh, S. Yano, T. Yokoo, S. Satoh, D. Kawana, Y. Kousaka, J. Akimitsu, Y. Endoh
  • Journal Title: J. Phys.: Conf. Series Volume: 502 Pages: 1-4
  • DOI: 10.1088/1742-6596/502/1/012044
  • Peer Reviewed
• [Journal Article] Construction of Polarized Inelastic Neutron Spectrometer in J-PARC (2014)
  • Author(s): T. Yokoo, K. Ohoyama, S. Itoh, J. Suzuki, M. Nanbu, N. Kaneko, K. Iwasa, T. J. Sato, H. Kimura and M. Ohkawara
  • Journal Title: J. Phys.: Conf. Series Volume: 502 Pages: 1-5
  • DOI: 10.1088/1742-6596/502/1/012046
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Neutron Brillouin Scattering Experiments with Pulsed Neutrons on High Resolution Chopper Spectrometer HRC (2014)
  • Author(s): S. Itoh, T. Yokoo, D. Kawana, Y. Kaneko, Y. Tokura, M. Fujita, K. Yoshida, K. Saito, N. Inami, Y. Takeichi, K. Ono, Y. Endoh
  • Journal Title: J. Phys.: Conf. Series Volume: 502 Pages: 1-5
  • DOI: 10.1088/1742-6596/502/1/012043
  • Peer Reviewed
• [Presentation] 中性子非弾性散乱を用いた1次元ハルデン鎖を持つNd2BaNiO5に対する研究 (2018)
  • Author(s): 羽合孝文、横尾哲也、伊藤晋一、吉沢英樹
  • Organizer: 量子ビームサイエンスフェスタ
• [Presentation] ハルデン系Nd2BaNiO5における一次元量子スピン鎖の磁気励起 (2017)
  • Author(s): 横尾哲也、羽合孝文、伊藤晋一、吉澤英樹
  • Organizer: 日本物理学会2017年秋季大会
• [Presentation] Classical and Quantum Magnetic Fluctuations in 1-dimensional Haldane Chain Nd2BaNiO5 (2017)
  • Author(s): T. Yokoo, T. Hawai, S. Itoh, H. Yoshizawa
  • Organizer: International Conference on Low Temperature Physics
  • Int'l Joint Research
• [Presentation] 1次元ハルデン鎖を持つNd2BaNiO5単結晶の非弾性散乱 (2017)
  • Author(s): 羽合孝文、横尾哲也、伊藤晋一、吉沢英樹
  • Organizer: 日本中性子科学会
• [Presentation] ホールドープされた一次元鎖のスピン-電荷ダイナミクス (2016)
  • Author(s): 横尾哲也、羽合孝文、伊藤晋一、池田陽一、吉澤英樹
  • Organizer: 日本物理学会秋季大会
  • Place of Presentation: 金沢大学（石川県・金沢市）
  • Year and Date: 2016-09-13
• [Presentation] Magnetic Excitation of Hole-doped Haldane Chain Nd1.9Ca0.1BaNiO5 (2016)
  • Author(s): T. Yokoo, S. Itoh, S. Ibuka, Y. Ikeda, H. Yoshizawa, J. Akimitsu
  • Organizer: 5th International Conference on Superconductivity and Magnetism
  • Place of Presentation: Fetiye, Turkey
  • Year and Date: 2016-04-24
• [Presentation] ホールドープされた量子スピン鎖Nd2-xCaxBaNiO5における磁気励起 (2016)
  • Author(s): 横尾哲也
  • Organizer: 量子ビームサイエンスフェスタ
  • Place of Presentation: つくば国際会議場（茨城県つくば市）
  • Year and Date: 2016-03-15
• [Presentation] Dynamical Properties of Hole-doped Quantum Haldane Chain Nd2-xCaxBaNiO5 (2015)
  • Author(s): T. Yokoo
  • Organizer: 20th International Conference on Magnetism
  • Place of Presentation: Barcelona, Spain
  • Year and Date: 2015-07-05
  • Int'l Joint Research
• [Presentation] Progress on POLANO Spectrometer for Polarized Neutron Experiment (2014)
  • Author(s): T. Yokoo
  • Organizer: International Collaboration on Advanced Neutron Sources
  • Place of Presentation: Mito, Japan
  • Year and Date: 2014-09-29 – 2014-10-03
• [Presentation] Recent Progress on Neutron Spectrometer POLANO (2014)
  • Author(s): T. Yokoo
  • Organizer: Polarised Neutrons for Condensed Matter Investigations 2014
  • Place of Presentation: Sydney, Australia
  • Year and Date: 2014-09-15 – 2014-09-19
• [Presentation] Spin and Hole Dynamics in Carrier-Doped Quantum Haldane Chain (2014)
  • Author(s): T. Yokoo
  • Organizer: 27th International Conference on Low Temperature Physics
  • Place of Presentation: Buenos Aires, Argentina
  • Year and Date: 2014-08-06 – 2014-08-13
• [Presentation] Polarized neutron spectrometer for inelastic scattering experiments at J-PARC ~ Status of POLANO project ~ (2014)
  • Author(s): T. Yokoo
  • Organizer: QENS/WINS 2014
  • Place of Presentation: Autrans, France
  • Year and Date: 2014-05-11 – 2014-05-16
  • Invited
• [Remarks]
  • URL: http://research.kek.jp/people/tyokoo/index.html