Elucidation and exploration of field-induced transitions and magnetization plateaux in chromium spinels

• Project/Area Number: 18740194
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: The University of Tokyo
• Principal Investigator: UEDA Hiroaki The University of Tokyo, 物性研究所, 助教 (10373276)
• Project Period (FY): 2006 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥3,580,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥180,000); Fiscal Year 2008: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2007: ¥1,000,000 (Direct Cost: ¥1,000,000); Fiscal Year 2006: ¥1,800,000 (Direct Cost: ¥1,800,000)
• Keywords: フラストレーション / 磁気転移 / スピン格子相互作用 / 強相関電子系 / 磁性 / 低温物性

Research Abstract

水銀クロムスピネルにおける半磁化相の磁気構造が3up-1downであることが明らかになった。さらに、半磁化相への磁気転移を示す三つ目の系として、亜鉛のクロムスピネルを発見した。このことにより、系統的な比較が可能となり、水銀、カドミウム、亜鉛とイオン半径が小さくなるにつれて、スピン格子相互作用が小さくなり、亜鉛の系では他の系とは異なった磁気相も現れることが明らかになった。

Research Products

• [Journal Article] Full-magnetization of geometrically frustrated CdCr2O4 determined by Faraday rotation measurements at magnetic fields up to 140 T (2008)
  • Author(s): E. Kojima, A. Miyata, S. Miyabe, S. Takeyama, H. Ueda, and Y. Ueda
  • Journal Title: Physical Review B 77
  • Peer Reviewed
• [Journal Article] Pressure-Enhanced Direct Exchange Couplings in Chromium Spinels (2008)
  • Author(s): H. Ueda and Y. Ueda
  • Journal Title: Physical Review B 77
  • Peer Reviewed
• [Journal Article] Full-magnetization of geometrically frustrated CdCr$_2$0$_4$ determined by Faraday rotation measurements at magnetic fields up to 140 T (2008)
  • Author(s): E. Kojima, A. Miyata, S. Miyabe, S. Takeyama, H. Ueda, and Y. Ueda
  • Journal Title: Physical Review B 77
  • Peer Reviewed
• [Journal Article] Phase Transitions of a Geometrically Frustrated Spin System CdCr2O4 in Very High Magnetic Fields (2007)
  • Author(s): H. Mitamura, H. Ueda, H. A. Katori, S. Takeyama, T. Sakakibara, Y. Ueda, and H. Takagi
  • Journal Title: Journal of the Physical Society of Japan 76
  • NAID: 130005297001
  • Peer Reviewed
• [Journal Article] Lattice Deformations Induced by an Applied Magnetic Field in the Frustrated Antiferromagnet HgCr2O4 (2007)
  • Author(s): Y. Tanaka, Y. Narumi, N. Terada, K. Katsumata, H. Ueda, et. al,
  • Journal Title: Journal of the Physical Society of Japan 76 Pages: 43708-43708
  • NAID: 130005296783
  • Peer Reviewed
• [Journal Article] S=3/2 spin systems on frustrated pyrochlore lattice (2007)
  • Author(s): H. Ueda, J.-I. Yamaura, H. Mitamura, T. Goto, H. A. Katori, H. Takagi and Y. Ueda
  • Journal Title: Journal of Magnetism and Magnetic Materials 310 Pages: 1275-1275
  • Peer Reviewed
• [Journal Article] Lattice Deformations Induced by an Applied Magnetic Field in the Frustrated Antiferromagnet HgCr_2O_4 (2007)
  • Author(s): Y.Tanaka, Y.Narumi, N.Terada, K.Katsumata, H.Ueda, et al.
  • Journal Title: Journal of the Physical Society of Japan 76 Pages: 43708-43708
  • NAID: 110006278033
• [Journal Article] S=3/2 spin systems on frustrated pyrochlore lattice (2007)
  • Author(s): H.Ueda, J.-I.Yamaura, H.Mitamura, T.Goto, H.A.Katori, H.Takagi, Y.Ueda
  • Journal Title: Journa of Magnetism and Magnetic Materials 310 Pages: 1275-1275
• [Journal Article] Observation of Higher-Harmonic Helical Spin-Resonance Modes in the Chromium Spinel CdCr2O4 (2006)
  • Author(s): S. Kimura, M. Hagiwara, H. Ueda, Y. Narumi, K. Kindo, H. Yashiro, T. Kashiwagi, and H. Takagi
  • Journal Title: Physical Review Letters 97
  • Peer Reviewed
• [Journal Article] Observation of Higher-Harmonic Helical Spin-Resonance Modes in the Chromium Spinel CdCr_2O_4 (2006)
  • Author(s): S.Kimura, M.Hagiwara, H.Ueda, Y.Narumi, K.Kindo, H.Yashiro, T.Kashiwagi, H.Takagi
  • Journal Title: Physical Review Letters 97 Pages: 257202-257202
• [Presentation] クロムスピネルの磁気転移とスピン-格子相互作用 (2009)
  • Author(s): 植田浩明
  • Organizer: 「フラストレーションが創る新しい物性」平成20年度領域成果報告会
  • Place of Presentation: 東京大学物性研究所
  • Year and Date: 2009-01-07
• [Presentation] クロムスピネルにおけるスピンフラストレーションと磁場誘起相の研究 (2008)
  • Author(s): 植田浩明
  • Organizer: 日本物理学会 第63回年次大会
  • Place of Presentation: 近畿大学
  • Year and Date: 2008-03-24
• [Presentation] クロムスピネルにおける新規な磁気転移 (2008)
  • Author(s): 植田浩明
  • Organizer: フラストレーションが創る新しい物性トピカルメーティング「フラストレート新規物質」
  • Place of Presentation: 京都大学
  • Year and Date: 2008-01-12
• [Presentation] クロムスピネルにおける新規な磁気転移 (2008)
  • Author(s): 植田浩明
  • Organizer: フラストレーションが創る新しい物性 トピカルメーティング「フラストレート新規物質」
  • Place of Presentation: 京都大学
  • Year and Date: 2008-01-12
• [Presentation] S=3/2 spin systems on frustrated pyrochlore lattice (2006)
  • Author(s): H.Ueda
  • Organizer: International Conference on Magnetism 2006
  • Place of Presentation: 京都(招待講演)
  • Year and Date: 2006-08-24
• [Remarks]
  • URL: http://yueda.issp.u-tokyo.ac.jp/weda-ghlght.html