Research for Huge Magnetoresistance in Actinide Compounds

• Project/Area Number: 21540373
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Japan Atomic Energy Agency
• Principal Investigator: YAMAMOTO Etsuji 独立行政法人日本原子力研究開発機構, 先端基礎研究センター, 研究副主幹 (50343934)
• Co-Investigator(Kenkyū-buntansha): MATSUDA Tatsuma 独立行政法人日本原子力研究開発機構, 先端基礎研究センター, 研究副主幹 (30370472) ; TATEIWA Naoyuki 独立行政法人日本原子力研究開発機構, 先端基礎研究センター, 研究主幹 (50346821)
• Project Period (FY): 2009 – 2012
• Project Status: Completed (Fiscal Year 2012)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2012: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000); Fiscal Year 2011: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2010: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2009: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 強相関電子系 / アクチノイド / 巨大磁気抵抗

Research Abstract

β-US_2 is narrow gap semiconductor and does not order magnetically. The narrow gap is very sensitive to a magnetic field or a high pressure. β-US_2 have a huge magnetoresistance which has 10^<-6> -10^<-8> order, with a magnetic field of 7 T or under a high pressure of 8 Gpa. We grew high quality single crystal of US_2 and clarified the property of magnetoresistance by magnetic susceptibility, electric resistance and neutron scattering measurement.

Research Products

• [Journal Article] Non-magnetic to Magnetic Transition under High Pressure in Narrow-Gap Semiconductor □-US_2 (2011)
  • Author(s): N.Tateiwa, Y.Onuki, et al
  • Journal Title: Journal of the Physical Society of Japan, Supplement Volume: 80 Issue: Suppl.A Pages: SA103-SA103
  • DOI: 10.1143/jpsjs.80sa.sa103
  • Peer Reviewed
• [Journal Article] Magnetic-Field-Induced Metallic State in □-US_2 (2011)
  • Author(s): K.Sugiyama, Y.Onuki, et al
  • Journal Title: Journal of the Physical Society of Japan, Supplement Volume: 80 Issue: Suppl.A Pages: SA104-SA104
  • DOI: 10.1143/jpsjs.80sa.sa104
  • Peer Reviewed
• [Journal Article] IOP Conf. (2010)
  • Author(s): N. Metoki, K. Kaneko, S. Ikeda, H. Sakai, E. Yamamoto, Y, Haga, Y, Homma, Y. Shiokawa
  • Journal Title: Series: Materials Science and Engineering Volume: Vol. 9
  • Peer Reviewed
• [Journal Article] Neutron scattering study on U-dichalcogenides (2010)
  • Author(s): N.Metoki, 他
  • Journal Title: IOP Conf.Series : Materials Science and Engineering Volume: Vol.9
  • Peer Reviewed
• [Journal Article] Possible Existence of Magnetic Polaron in Nearly Ferromagnetic Semiconductor β-US_2 (2009)
  • Author(s): S. IKEDA, H. SAKAI, N. TATEIWA, T. D. MATSUDA, D. AOKI, Y. HOMMA, E. YAMAMOTO, A. NAKAMURA, Y, SHIOKAWA, Y, OTA, K. SUGIYAMA, M. HAGIWARA, K. KINDO, K. MATSUBAYASHI, M. HEDO, Y. UWATOKO, Y. HAGA, Y. ONUKI
  • Journal Title: Journal of the Physical Society of Japan Volume: Vol.78 Pages: 114704-114704
  • Peer Reviewed
• [Journal Article] Possible Existence of Magnetic Polaron in Nearly Ferromagnetic Semiconductor 6-US_2 (2009)
  • Author(s): Shugo Ikeda, 他
  • Journal Title: J.Phys.Soc.Jpn. 78 Pages: 114704-114704
  • Peer Reviewed
• [Presentation] ウランダイカルコゲナイトの中性子散乱実験 (2013)
  • Author(s): 目時直人 他
  • Organizer: 日本物理学会第68回年次大会
  • Place of Presentation: 広島大学
• [Presentation] Magnetic properties of β-US2 single crystals (2012)
  • Author(s): Etsuji Yamamoto 他
  • Organizer: the 19th International Conference on Magnetism
  • Place of Presentation: 釜山（韓国）
• [Presentation] ナローギャップモット絶縁体β-US2における5f電子遍歴及び局在クロスオーバー (2012)
  • Author(s): 目時直人 他
  • Organizer: 日本物理学会2012年秋季大会
  • Place of Presentation: 横浜国立大学
• [Presentation] ウランカルコゲナイドにおける結晶場励起の磁場依存性 (2009)
  • Author(s): 山本悦嗣、芳賀芳範、立岩尚之、菅井孝志、池田修悟、大貫惇睦
  • Organizer: 日本物理学会 2009 年秋季大会
  • Place of Presentation: 熊本大学
  • Year and Date: 2009-09-25
• [Presentation] ウランカルコゲナイドにおける結晶場励起の磁場依存性 (2009)
  • Author(s): 山本悦嗣, 他
  • Organizer: 日本物理学会 2009年秋季大会
  • Place of Presentation: 熊本大学
  • Year and Date: 2009-09-25