Study on basic process and applications of radiation-induced insu ator-meta transition

• Project/Area Number: 21760704
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Nuclear engineering
• Research Institution: Tohoku University
• Principal Investigator: KOSHIMIZU Masanori 東北大学, 大学院・工学研究科, 助教 (40374962)
• Project Period (FY): 2009 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2010: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000); Fiscal Year 2009: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
• Keywords: 永続的光伝導 / ペロブスカイト型マンガン酸化物 / 放射線照射 / 電子相関 / 軌道秩序 / 電荷整列

Research Abstract

We investigated persistent photoconductive (PPC) behavior of various transition-metal oxides under X-ray irradiation. We clarified that the orbital ordered state is the prerequisite for the PPC. In addition, it was revealed that particle size or grain boundary significantly influence the PPC behavior in the polycrystalline samples. In order to apply the PPC to radiation detectors, control on the particle size is very important.

Research Products

• [Journal Article] X-ray-induced persistent photoconductivity in La_<0.9>A_<0.1>MnO_3 (A=Ca,Sr) (2009)
  • Author(s): K. Emoto, M. Koshimizu, and K. Asai
  • Journal Title: Radiat. Phys. Chem. Volume: 78 Pages: 1034-1037
  • Peer Reviewed
• [Journal Article] Positron lifetime study of Pr_<1-x>Ca_xMnO_3 (x=0.5, 0.3) during magnetic transition (2009)
  • Author(s): Y. Tomioka, M. Koshimizu, and K. Asai
  • Journal Title: Radiat. Phys. Chem. Volume: 78 Pages: 1092-1095
  • Peer Reviewed
• [Journal Article] Positron lifetime study of Pr_<1-x>Ca_xMnO_3(x=0.5, 0.3)during magnetic transition (2009)
  • Author(s): 冨岡泰宏、越水正典、浅井圭介
  • Journal Title: Radiation Physics and Chemistry 78 Pages: 1092-1095
  • Peer Reviewed
• [Journal Article] X-ray-induced persistent photoconductivity in La_<0.9>A_<0.1>MnO_3(A=Ca, Sr) (2009)
  • Author(s): 江本渓、越水主典、浅井圭介
  • Journal Title: Radiation Physics and Chemistry 78 Pages: 1034-1037
  • Peer Reviewed
• [Presentation] 微量ドープLa_<1-x>Ca_xMnO_3におけるX線誘起永続的光伝導 (2009)
  • Author(s): 江本渓、越水正典、浅井圭介
  • Organizer: 第52回放射線化学討論会
  • Place of Presentation: 福井
  • Year and Date: 2009-09-26
• [Presentation] 微量ドープLa_<1_x>Ca_xMnO_3におけるX線誘起永続的光伝導 (2009)
  • Author(s): 江本渓, 越水正典, 浅井圭介
  • Organizer: 第52回放射線化学討論会
  • Place of Presentation: 福井工業大学、福井
• [Remarks]
  • URL: http://www.che.tohoku.ac.jp/~qpc