High-field NMR study of novel quantum phases in quantum spin systems

• Project/Area Number: 26800176
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II
• Research Institution: The University of Tokyo
• Principal Investigator: Yoshida Makoto 東京大学, 物性研究所, 助教 (40379475)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2015: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: 磁性 / 磁気共鳴 / フラストレーション系 / 量子スピン系 / 強磁場

Outline of Final Research Achievements

By using nuclear magnetic resonance (NMR) measurements in high-magnetic fields, we have investigated novel magnets which show unusual spin states due to quantum effects. In particular, we focus on spin nematic states which are analog of crystal liquids. In a candidate material volborthite, we have found an unusual magnetic phase near 25 T, where our NMR results support the realization of a spin nematic state. In another candidate NaCuMoO4(OH), we have investigated the magnetic structure at low temperatures by using NMR. We revealed the structure and field dependence up to 15 T. These results show that this compound is well described as ferromagnetic frustrated chains, which would show a spin nematic state in higher magnetic fields.

Research Products

• [Journal Article] One-Third Magnetization Plateau with a Preceding Novel Phase in Volborthite (2015)
  • Author(s): Hajime Ishikawa, Makoto Yoshida, Kazuhiro Nawa, Minki Jeong, Steffen Kramer, Mladen Horvatic, Claude Berthier, Masashi Takigawa, Mitsuru Akaki, Atsushi Miyake, Masashi Tokunaga, Koichi Kindo, Junichi Yamaura, Yoshihiko Okamoto, Zenji Hiroi
  • Journal Title: Physical Review Letters Volume: 114 Issue: 22 Pages: 2272021-5
  • DOI: 10.1103/physrevlett.114.227202
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] ボルボサイト低磁場相の磁気構造とスピンゆらぎ (2015)
  • Author(s): 吉田誠, 山下穣, 山口明, 瀧川仁, 石川孟, 山浦淳一, 岡本佳比古, 広井善二
  • Organizer: 日本物理学会
  • Place of Presentation: 関西大学（大阪府吹田市）
  • Year and Date: 2015-09-16
• [Presentation] 単結晶volborthiteの強磁場NMRIII (2015)
  • Author(s): 吉田誠，那波和宏，瀧川仁，M. Jeong，S. Kramer，M. Horvatic，C. Berthier，松井一樹，後藤貴行，木村尚次郎，佐々木孝彦，石川孟，山浦淳一，吉田紘行，岡本佳比古，広井善二
  • Organizer: 日本物理学会
  • Place of Presentation: 早稲田大学（東京都新宿区）
  • Year and Date: 2015-03-21 – 2015-03-25
• [Presentation] 単結晶volborthiteの強磁場NMRII (2014)
  • Author(s): 吉田誠，那波和宏，瀧川仁，M. Jeong，S. Kramer，M. Horvatic，C. Berthier，石川孟，山浦淳一，吉田紘行，岡本佳比古，広井善二
  • Organizer: 日本物理学会
  • Place of Presentation: 中部大学（愛知県春日井市）
  • Year and Date: 2014-09-07 – 2014-09-10
• [Presentation] High eld magnetic phases of volborthite studied by single crystal NMR (2014)
  • Author(s): M. Yoshida, K. Nawa, M. Takigawa, H. Ishikawa, Y. Okamoto, Z. Hiroi, M. Jeong, S. Kramer, M. Horvatic, C. Berthier, J. Yamaura, H. Yoshida
  • Organizer: International Conference on Highly Frustrated Magnetism
  • Place of Presentation: ケンブリッジ（イギリス）
  • Year and Date: 2014-07-07 – 2014-07-11