Development of Tera-Hz emission device with high-Tc superconductivity

• Project/Area Number: 18740190
• 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: KOJIMA Kenji The University of Tokyo, 大学院理学系研究科, 助教 (60302759)
• Project Period (FY): 2006 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥3,710,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥210,000); Fiscal Year 2008: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2007: ¥1,000,000 (Direct Cost: ¥1,000,000); Fiscal Year 2006: ¥1,800,000 (Direct Cost: ¥1,800,000)
• Keywords: テラヘルツ / 高温超伝導 / 多層系 / 光学応答 / 磁場誘起 / ジョセフソン接合 / 磁気光学効果 / 積層構造 / イットリウム系高温超伝導体 / ビスマス系高温超伝導体 / 水銀系高温超伝導体 / ジョセフソン結合 / 磁場光学効果 / 400cm-1モード

Research Abstract

単結晶格子に複数枚のCuO2面を持つ、いわゆる多層系高温超伝導体の面間(c軸)方向の光学伝導度には、超伝導とともにテラヘルツ領域に現れる特徴的な応答があり、物質とドープ量をパラメータにして、その生成機構を探った。さらに、外部磁場によってより低エネルギーに誘起される光学モードがイットリウム系高温超伝導体には存在し、テラヘルツ発光素子の開発を目指して、その性質を研究した。

Research Products

• [Journal Article] Enhancement of the superconduting critical temperature in Bi2Sr2CaCu2O8+d by controlling disorder outside CuO2 planes (2009)
  • Author(s): H. Hobou, S. Ishida, K. Fujita, M. Ishikado, K.M. Kojima, H. Eisaki, and S. Uchida
  • Journal Title: Phys. Rev. B 79, 64507 Pages: 1-9
  • Peer Reviewed
• [Journal Article] Enhancement of the superconduting critical temperature in Bi2Sr2CaCu2O8+d by controlling disorder outside CuO2 planes (2009)
  • Author(s): H. Hobou et.al.
  • Journal Title: Phys. Rev. B 79 Pages: 645071-6
  • Peer Reviewed
• [Journal Article] Observations on the resonant inelastic x-ray scattering cross section incopper oxide compounds (2007)
  • Author(s): Young-June Kim, et. al.
  • Journal Title: Phys. Rev. B 76 Pages: 1551161-7
  • Peer Reviewed
• [Journal Article] Muon spin relaxation study of superconducting Bi2Sr2-xLaxCuO6+δ (2007)
  • Author(s): R.L.Russo et al.
  • Journal Title: Phys.Rev.B 75 Pages: 0545111-14
• [Journal Article] Magnetism and superconductivity of an electron-doped superconductor(Sr1-xLax)CuO2 (2006)
  • Author(s): K.M. Kojima, et al.
  • Journal Title: Physica B 374-375 Pages: 207-210
  • Peer Reviewed
• [Journal Article] Transferred spectral weight from the pseudo-gap: Magnetic field dependence of the c-axis optical response in YBa2Cu3O6.6 (2006)
  • Author(s): K.M. Kojima, S. Uchida, Y. Fudamoto and S. Tajima
  • Journal Title: J. Phys. Chem. Solids 67 Pages: 232-234
  • Peer Reviewed
• [Journal Article] Transferred spectral weight from the pseudo-gap : Magnetic field dependence of the c-axis optical response in YBa2Cu3O6.6 (2006)
  • Author(s): K.M.Kojima, S.Uchida, Y.Fudamoto, S.Tajima
  • Journal Title: J.Phys.Chem.Solids 67 Pages: 232-234
• [Journal Article] Magnetism and superconductivity of an electron-doped superconductor(Srl-xLax)CuO2 (2006)
  • Author(s): K.M.Kojima, et al.
  • Journal Title: Physica B 374-375 Pages: 207-210
• [Journal Article] Strongly reduced superfluid density in the inhomogeneous high-Tc cuprates : far-infrared study (2006)
  • Author(s): S.Tajima, et al.
  • Journal Title: J.Phys.Chem.Solids 67 Pages: 321-324
• [Presentation] Optical response of Josephson vortices: underdoped YBCO (2006)
  • Author(s): K.M. Kojima, Y. Fudamoto, S. Tajima, S. Uchida
  • Organizer: 第8回超伝導国際会議(M2S-HTSC-VIII)
  • Place of Presentation: ドレスデン (招待講演)