Effects of impurities and defects on the magnetization plateau in multiferroic materials

• Project/Area Number: 16K05420
• 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: Sophia University
• Principal Investigator: Kuroe Haruhiko 上智大学, 理工学部, 准教授 (40296885)
• Project Period (FY): 2016-04-01 – 2023-03-31
• Project Status: Completed (Fiscal Year 2022)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2016: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
• Keywords: 反強磁性スピン鎖 / 不純物効果 / 磁化プラトー / パルス強磁場 / マルチフェロイック物質 / 交叉相関 / 磁歪 / スピン・フラストレーション / 超強磁場物性 / ファラデー回転法 / 反強磁性鎖 / 磁気熱量効果 / 等エントロピー曲線 / 物性実験 / 量子ビーム / Ｘ線

Outline of Final Research Achievements

We studied the impurity effects on the distorted tetrahedral spin system Cu3Mo2O9 where the spin frustration effects appear, as well as the multiferroic properties of this system under the strong magnetic field generated by the pulsed magnet. We synthesized the single crystal and measured the specific heat and magnetization under the magnetic fields generated by superconducting magnets. Also, we measured the magnetostriction under the magnetic fields generated by a non-destructive pulsed magnet. Finally, we challenged to measure the magnetization curve under the ultra-strong magnetic fields generated by a destructive magnet with the one-turn coil.

Academic Significance and Societal Importance of the Research Achievements

マルチフェロイック物質の持つ磁性と強誘電性の間の交叉相関を研究する事で、スピンという軸性ベクトルが、誘電分極という極性ベクトルと、どの様に影響しあうかを実験的に研究できる。この系を実験的に研究する意義がここにある。特にこの系のマルチフェロイックな性質はスピン系の超周期構造が作るものではなく、磁気対称群の対称性の低下として、単純に説明できる。その意味では稀有な特徴を有している。
また、低温で様々な性質を外場で制御できるので吸熱反応を連続して行うサイクルが作れるかもしれない。そうすれば気体の断熱膨張や磁性体の断熱消磁に続く新しい冷凍材料として、研究が産業的に価値ある社会的意義を持つと期待される。

Research Products

• [Journal Article] Magnetic and nonmagnetic impurity effects on Cu3Mo2O9 (2018)
  • Author(s): Y Ebukuro, M Noda, H Kuwahara, H Kuroe, M Hase, K Oka, T Ito and H Eisaki
  • Journal Title: Journal of Physics: Conference Series Volume: 969 Pages: 0121101-6
  • DOI: 10.1088/1742-6596/969/1/012110
  • Peer Reviewed / Open Access
• [Presentation] Modulation of magnetization curve induced by electric field in Cu3Mo2O9 (2022)
  • Author(s): 黒江晴彦
  • Organizer: The 6th International Conference on Functional Materials Science In Conjunction With RIKEN Symposium: International Workshop on Organic Molecular Systems
  • Int'l Joint Research
• [Presentation] Magnetization Plateau in Cu3Mo2O9 above 100 T (2019)
  • Author(s): H. Kuroe, H. Kuwahara, M. Hase, K. Oka, T. Ito, H. Eisaki, A. Ikeda, D. Nakamura, Y. H. Matsuda, and S. Takeyama
  • Organizer: The 16th International Conference on Megagauss Magnetic Field Generation and Related Topics (Poster nubmer B16)
  • Int'l Joint Research
• [Presentation] Cu3Mo2O9 の飽和磁場までの磁化曲線 (2019)
  • Author(s): 黒江晴彦, 野田正亮, 桑原英樹, 中村大輔, 嶽山正二郎, 長谷正司, 岡邦彦, 伊藤利充, 永崎洋
  • Organizer: 日本物理学会 第74回年次大会（2019年）
• [Presentation] Cu3Mo2O9における磁性不純物置換効果 (2018)
  • Author(s): 黒江晴彦, 江袋佑太, 野田正亮, 桑原英樹, 長谷正司, 岡邦彦, 伊藤利充, 永崎洋
  • Organizer: 日本物理学会 第73回年次大会
• [Presentation] Cu3(Mo,W)2O9の磁化測定2 (2017)
  • Author(s): 江袋佑太，阿部太亮，小田涼佑，桑原英樹，黒江晴彦，長谷正司，岡邦彦，伊藤利充，永崎洋
  • Organizer: 日本物理学会第72回年次大会
  • Place of Presentation: 大阪大学豊中キャンパス(大阪市・大阪府)
  • Year and Date: 2017-03-17
• [Presentation] Cu3Mo2O9における、磁性及び非磁性不純物置換効果 (2017)
  • Author(s): 江袋佑太, 野田正亮, 桑原英樹, 黒江晴彦, 長谷正司, 岡邦彦, 伊藤利充, 永崎洋
  • Organizer: 日本物理学会 2017年秋季大会
• [Presentation] Nonmagnetic impurity effects on distorted tetrahedral spin-chain systems Cu3(Mo,W)2O9 (2017)
  • Author(s): Haruhiko KUROE, Yuta EBUKURO, Yoshinori HIRATA, Masaaki NODA, Ryosuke ODA, Hideki KUWAHARA, Masashi HASE, Kunihiko OKA, Toshimitsu ITO, and Hiroshi EISAKI
  • Organizer: International Conference on Strongly Correlated Electron Systems (SCES 2017)
  • Int'l Joint Research
• [Presentation] Magnetic impurity effects on distorted tetrahedral spin-chain systems (Cu,Ni)3Mo2O9 (2017)
  • Author(s): Yuta EBUKURO, Masaaki NODA, Ryosuke ODA, Hideki KUWAHARA, Haruhiko KUROE, Masashi HASE, Kunihiko OKA, Toshimitsu ITO, and Hiroshi EISAKI
  • Organizer: International Conference on Strongly Correlated Electron Systems (SCES 2017)
  • Int'l Joint Research
• [Presentation] Magnetic and nonmagnetic impurity substitution effects on (2017)
  • Author(s): Y Ebukuro, M Noda, H Kuwahara, H Kuroe, M Hase, K Oka, T Ito and H Eisaki
  • Organizer: 28th International Conference on Low Temperature Physics
  • Int'l Joint Research
• [Presentation] 四面体磁性鎖を持つ (Cu,Zn)3Mo2O9 の磁気熱量効果 (2016)
  • Author(s): 江袋佑太，黒江晴彦，長谷正司,小濱芳允, 金道浩一, 岡邦彦, 伊藤利充, 永崎洋
  • Organizer: 日本物理学会2016年秋季大会
  • Place of Presentation: 金沢大学角間キャンパス（金沢市・石川県）
  • Year and Date: 2016-09-13
• [Presentation] 四面体磁性鎖を持つ Cu3Mo2O9 の「磁歪プラトー」 (2016)
  • Author(s): 黒江晴彦，江袋佑太，長谷正司，河智史朗，徳永将史，岡邦彦C，伊藤利充，永崎洋
  • Organizer: 日本物理学会2016年秋季大会
  • Place of Presentation: 金沢大学角間キャンパス（金沢市・石川県）
  • Year and Date: 2016-09-13
• [Presentation] Magnetocaloric Effects on Impurity-Doped Tetrahedral Spin-Chain Systems (Cu,Zn)3Mo2O9 (2016)
  • Author(s): Y. Ebukuro, H. Kuroe, M. Hase,Y. Kohama, K. Kindo, K. Oka, T. Ito, and H. Eisaki
  • Organizer: International Conference on Highly Frustrated Magnetism 2016
  • Place of Presentation: GIS NTU Convention Center (台北・中華民国)
  • Year and Date: 2016-09-06
  • Int'l Joint Research
• [Presentation] Observation of 'Magnetostriction Plateau' on Tetrahedral Spin-Chain System Cu3Mo2O9 (2016)
  • Author(s): H. Kuroe, Y. Ebukuro, M. Hase, S. Kawachi, M. Tokunaga, K. Oka, T. Ito, and H. Eisaki
  • Organizer: International Conference on Highly Frustrated Magnetism 2016
  • Place of Presentation: GIS NTU Convention Center (台北・中華民国)
  • Year and Date: 2016-09-06
  • Int'l Joint Research