Study of collective charge excitations in nano-stack of Intrinsic Josephson junctions

• Project/Area Number: 19560011
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Applied materials science/Crystal engineering
• Research Institution: Aoyama Gakuin University
• Principal Investigator: KITANO Haruhisa Aoyama Gakuin University, 理工学部, 准教授 (00313164)
• Project Period (FY): 2007 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2008: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2007: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
• Keywords: 超伝導材料素子 / ナノ材料 / 量子コンピューター / 高温超伝導 / ジョセフソン効果 / 超伝導材料・素子 / 量子コンピュータ

Research Abstract

超伝導体と絶縁体がナノスケールで交互に積み重なった構造(ナノスタック超伝導接合)を持つ高温超伝導体の固有ジョセフソン接合における複雑な位相ダイナミクスを解明するために、Bi 系及びLa 系高温超伝導体のナノスタック接合素子を作製する技術を開発した。この二つの物質系で大きく異なる接合間相互作用の違いがナノスタック接合素子の位相ダイナミクスに強く影響することを見出した。さらに、接合間相互作用効果の検証にスイッチング電流分布測定が有効なことを見出した。

Research Products

• [Journal Article] Comparative study of macroscopic quantum tunneling in Bi_2Sr_2CaCu_2Oy intrinsic Josephson junctions with different device structures (2009)
  • Author(s): K. Ota, K. Hamada, R. Takemura, M. Ohmaki, T. Machi, K. Tanabe, M. Suzuki, A. Maeda, and H. Kitano
  • Journal Title: Phys. Rev. B, 79 Pages: 134505-134505
  • Peer Reviewed
• [Journal Article] Macroscopic quantum tunneling and thermal activation in a small mesa structured Bi_2Sr_2CaCu_2Oy intrinsic Josephson junctions (2009)
  • Author(s): H. Kitano, K. Ota, K. Hamada, R. Takemura, M. Ohmaki, A. Maeda, and M. Suzuk
  • Journal Title: Journal of Physics: Conference Series 150 Pages: 52110-52110
  • Peer Reviewed
• [Journal Article] Comparison between the first- and the second-junction switchings in a small stack of Bi_2Sr_2CaCu_2Oy intrinsic Josephson junctions (2009)
  • Author(s): K. Ota, A. Maeda, T. Machi, K. Tanabe and H. Kitano
  • Journal Title: Journal of Physics: Conference Series 150 Pages: 52205-52205
  • Peer Reviewed
• [Journal Article] Macroscopic quantum tunneling and thermal activation in a small mesa structured Bi_2Sr_2CaCu_2O_y intrinsic Josephson junctions (2009)
  • Author(s): H. Kitano, et al.
  • Journal Title: Journal of Physics : Conference Series 150
  • Peer Reviewed
• [Journal Article] Comparison between the first- and the second-junction switchings in a small stack of Bi_2Sr_2CaCu_2O_y intrinsic Josephson junctions (2009)
  • Author(s): K. Ota, et al.
  • Journal Title: Journal of Physics : Conference Series 150
  • Peer Reviewed
• [Journal Article] Broadband method for precise microwave spectroscopy of superconducting thin films near the critical temperature (2008)
  • Author(s): H. Kitano, T. Ohashi, A. Maeda
  • Journal Title: Rev. Sci. Instrum. 79 Pages: 74701-74701
  • Peer Reviewed
• [Journal Article] Critical fluctuations and phase diagram of La_<2-x>Sr_xCuO_4 thin films (2008)
  • Author(s): H. Kitano, T. Ohashi, A. Maeda, and I. Tsukada
  • Journal Title: Physica C 468 Pages: 1120-1120
  • Peer Reviewed
• [Journal Article] Broadband method for precise microwave spectroscopy of superconducting thin films near the critical temperature (2008)
  • Author(s): H. Kitano, et al.
  • Journal Title: Review of Scientific Instruments 79
  • Peer Reviewed
• [Journal Article] Critical fluctuations and phase diagram of La_<2-x>Sr_xCuO_4 thin films (2008)
  • Author(s): H. Kitano, et al.
  • Journal Title: Physica C 468 Pages: 1120-1124
  • Peer Reviewed
• [Journal Article] Study of switching events from the zero-voltage state of Bi2212 intrinsic Josephson junctions (2007)
  • Author(s): H. Kitano, K. Ota, A. Maeda
  • Journal Title: Supercond. Sci. Technol. 20
  • Peer Reviewed
• [Journal Article] Switching current distribution in large Bi_2Sr_2CaCu_2Oy intrinsic Josephson junctions (2007)
  • Author(s): H. Kitano, K. Ota, and A. Maeda
  • Journal Title: Physica C 460-462 Pages: 1483-1483
  • Peer Reviewed
• [Journal Article] Study of switching events from the zero-voltage state of Bi2212 intrinsic Josephson junctions (2007)
  • Author(s): H.Kitano, et. al.
  • Journal Title: Supercond.Sci.Technol. 20
  • Peer Reviewed
• [Journal Article] Switching current distribution in large Bi_2Sr_2CaCu_2O_y intrinsic Josephson junctions (2007)
  • Author(s): H.Kitano, et. al.
  • Journal Title: Physica C 460-462 Pages: 1483-1484
  • Peer Reviewed
• [Presentation] La214 系固有ジョセフソン接合におけるスイッチング電流分布 (2009)
  • Author(s): 北野晴久 他
  • Organizer: 第56 回応用物理学関係連合講演会
  • Place of Presentation: 筑波大学
  • Year and Date: 2009-04-02
• [Presentation] La214系固有ジョセフソン接合におけるスイッチング電流分布 (2009)
  • Author(s): 北野晴久, 他
  • Organizer: 第56回応用物理学関係連合講演会
  • Place of Presentation: 筑波大学
  • Year and Date: 2009-04-02
• [Presentation] Bi2212 系およびLa214系固有ジョセフソン接合におけるMQT 挙動と接合間相互作用 (2009)
  • Author(s): 北野晴久 他
  • Organizer: 日本物理学会第64 回年次大会
  • Place of Presentation: 立教大学
  • Year and Date: 2009-03-27
• [Presentation] Bi2212系およびLa214系固有ジョセフソン接合におけるMQT挙動と接合間相互作用 (2009)
  • Author(s): 北野晴久, 他
  • Organizer: 日本物理学会第64回年次大会
  • Place of Presentation: 立教大学
  • Year and Date: 2009-03-27
• [Presentation] Bi2212 微小固有ジョセフソン接合のスイッチング特性におけるサイズ効果 (2008)
  • Author(s): 北野晴久 他
  • Organizer: 日本物理学会2008 年秋季大会
  • Place of Presentation: 岩手大学
  • Year and Date: 2008-09-22
• [Presentation] 固有ジョセフソン接合における接合間の相互作用効果 (2008)
  • Author(s): 太田健介 他
  • Organizer: 日本物理学会2008 年秋季大会
  • Place of Presentation: 岩手大学
  • Year and Date: 2008-09-22
• [Presentation] Bi2212微小固有ジョセフソン接合のスイッチング特性におけるサイズ効果 (2008)
  • Author(s): 北野晴久, 他
  • Organizer: 日本物理学会2008年秋季大会
  • Place of Presentation: 岩手大学
  • Year and Date: 2008-09-22
• [Presentation] 固有ジョセフソン接合における接合間の相互作用効果 (2008)
  • Author(s): 太田健介, 他
  • Organizer: 日本物理学会2008年秋季大会
  • Place of Presentation: 岩手大学
  • Year and Date: 2008-09-22
• [Presentation] Macroscopic quantum tunneling and thermal activation in a small mesa structured Bi_2Sr_2CaCu_2Oy intrinsic Josephson junctions (2008)
  • Author(s): H. Kitano et al.
  • Organizer: 25th International Conference on Low Temperature Physics
  • Place of Presentation: Amsterdam
  • Year and Date: 2008-08-08
• [Presentation] Comparison between the firstand the second-junction switchings in a small stack of Bi_2Sr_2CaCu_2Oy intrinsic Josephson junctions (2008)
  • Author(s): K. Ota et al.
  • Organizer: 25th International Conference on Low Temperature Physics
  • Place of Presentation: Amsterdam
  • Year and Date: 2008-08-08
• [Presentation] Macroscopic quantum tunneling and thermal activation in a small mesa structured Bi_2Sr_2CaCu_2O_y intrinsic Josephson junctions (2008)
  • Author(s): H. Kitano, et al.
  • Organizer: 25^<th> International Conference on Low Temperature Physics
  • Place of Presentation: Amsterdam
  • Year and Date: 2008-08-08
• [Presentation] Comparison between the first- and the second-junction switchings in a small stack of Bi_2Sr_2CaCu_2O_y intrinsic Josephson junctions (2008)
  • Author(s): K. Ota, et al.
  • Organizer: 25^<th> International Conference on Low Temperature Physics
  • Place of Presentation: Amsterdam
  • Year and Date: 2008-08-08
• [Presentation] Bi_2Sr_2CaCu_2Oy 固有接合におけるスイッチング電流分布とMQT (2008)
  • Author(s): 太田健介 他
  • Organizer: 日本物理学会
  • Place of Presentation: 近畿大学
  • Year and Date: 2008-03-24
• [Presentation] Bi_2Sr_2CaCu_2O_y固有接合におけるスイッチング電流分布とMQT (2008)
  • Author(s): 太田 健介, 他
  • Organizer: 日本物理学会
  • Place of Presentation: 近畿大学
  • Year and Date: 2008-03-24
• [Presentation] La_<2-x>Sr_xCuO_4 固有ジョセフソン接合における電流電圧特性とスイッチング分布 (2007)
  • Author(s): 太田健介 他
  • Organizer: 日本物理学会
  • Place of Presentation: 北海道大学
  • Year and Date: 2007-09-21
• [Presentation] La_<2-x>Sr_xCuO_4固有ジョセフソン接合における電流電圧特性とスイッチング分布 (2007)
  • Author(s): 太田 健介, 他
  • Organizer: 日本物理学会
  • Place of Presentation: 北海道大学
  • Year and Date: 2007-09-21
• [Remarks] ホームページ等
  • URL: http://www.phys.aoyama.ac.jp/~w3-kitano/index.html
• [Remarks]
  • URL: http://www.phys.aoyama.ac.jp/~w3-kitano/index.html
• [Remarks] 現在、研究室のオリジナルホームページを作成中であり、完成後、研究内容を公表する予定である。