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2008 Fiscal Year Final Research Report

Study of corporative macroscopic quantum effects in intrinsic Josephson junction stacks

Research Project

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Project/Area Number 19540359
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Condensed matter physics II
Research InstitutionTohoku University

Principal Investigator

KOYAMA Tomio  Tohoku University, 金属材料研究所, 助教 (30153696)

Co-Investigator(Renkei-kenkyūsha) KATO Masaru  大阪府立大学, 工学研究科, 准教授 (90204495)
MACHIDA Masahiko  独立行政法人日本原子力研究開発機構, 研究主幹 (60360434)
Project Period (FY) 2007 – 2008
Keywords高温超伝導体 / 巨視的量子効果 / ジョセフソン接合
Research Abstract

銅酸化物高温伝導体固有ジョセフソン接合系で観測される巨視的量子効果に対する理論的研究を行った。本研究では、主としてBi系高温超伝導体のc軸輸送で観測される低温での量子論的スイッチング現象に対する多重接合効果が考察された。研究成果として、接合間のキャパシティブ結合により量子トンネル効果が顕著に増大すること、及び、ユニバーサルスイッチングにおける脱出率の異常増大の機構を明らかにしたこと等である。以上の結果は、最近の実験結果と定量的に良い一致を示すものである。

  • Research Products

    (30 results)

All 2009 2008 2007

All Journal Article (19 results) (of which Peer Reviewed: 19 results) Presentation (11 results)

  • [Journal Article] Mechanism of Terahertz Electromagnetic Wave Emission from Intrinsic Josephson Junctions2009

    • Author(s)
      T. Tachiki, S. Fukuya and T. Koyama
    • Journal Title

      Phys. Rev. Lett 102

      Pages: 127002/1-4

    • Peer Reviewed
  • [Journal Article] In-phase Electrodynamics and Terahertz Wave Emission in Extended Intrinsic Josephson Junctions2009

    • Author(s)
      T. Koyama, H. Matsumoto, M. Machida and K. Kadowaki
    • Journal Title

      Phys. Rev. B 79

      Pages: 104522/1-12

    • Peer Reviewed
  • [Journal Article] Macroscopic Quantum Effects in Capacitively-Coupled Intrinsic Josephson Junctions2009

    • Author(s)
      T. Koyama and M. Machida
    • Journal Title

      J. Phys. Conf. Series 150

      Pages: 052127/1-4

    • Peer Reviewed
  • [Journal Article] Quantum Synchronization Effects in Intrinsic Josephson Junctions2008

    • Author(s)
      M. Machida, T. Kano, S. Yamada, M. Okumura, T. Imamura and T. Koyama
    • Journal Title

      Physica C 468

      Pages: 689-694

    • Peer Reviewed
  • [Journal Article] Macroscopic Quantum Tunneling in a Stack of Capacitively-Coupled Intrinsic Josephson Junctions2008

    • Author(s)
      T. Koyama and M. Machida
    • Journal Title

      Physica C 468

      Pages: 695-700

    • Peer Reviewed
  • [Journal Article] Macroscopic Quantum Effects in Intrinsic Josephson Junctions2008

    • Author(s)
      T. Koyama and M. Machida
    • Journal Title

      Physica C 468

      Pages: 1899-1902

    • Peer Reviewed
  • [Journal Article] Emission of Terahertz Electromagnetic Wave in Intrinsic Josephson Junction Stacks2008

    • Author(s)
      T. Koyama, H. Matsumoto and M. Machida
    • Journal Title

      J. Phys. Conf. Series 129

      Pages: 012026/1-5

    • Peer Reviewed
  • [Journal Article] Synchronization Effects in Intrinsic Josephson Junctions by Non-Equilibrium Heating2008

    • Author(s)
      M. Machida, T. Koyama and H. Matsumoto
    • Journal Title

      J. Phys. Conf. Series 129

      Pages: 012027/1-6

    • Peer Reviewed
  • [Journal Article] Quantum Effects on Capacitively-Coupled Intrinsic Josephson Junctions2008

    • Author(s)
      M. Machida, T. Kano, S. Yamada, T. Okumura and T. Koyama
    • Journal Title

      J. Phys. Chem. Solid 69

      Pages: 3221-3224

    • Peer Reviewed
  • [Journal Article] Effects of Capacitively Coupling on the Escape Rate in Intrinsic Josephson Junction Stacks2008

    • Author(s)
      T. Koyama and M. Machida
    • Journal Title

      J. Phys. Chem. Solid 69

      Pages: 3286-3288

    • Peer Reviewed
  • [Journal Article] Electromagnetic Waves in Single-and Multi-Josephson Junctions2008

    • Author(s)
      H. Matsumoto, T. Koyama and M. Machida
    • Journal Title

      Physica C 468

      Pages: 576-580

    • Peer Reviewed
  • [Journal Article] Direct Numerical Simulation for Non-Equilibrium Superconducting Dynamics at the Transition Edge2008

    • Author(s)
      M. Machida, T. Kano, T. Koyama, M. Kato and T. Ishida
    • Journal Title

      J. Low Temp. Phys 151

      Pages: 58-63

    • Peer Reviewed
  • [Journal Article] Collective Dynamics of Macroscopic Quantum Tunneling in Layered High-Tc Superconductors2007

    • Author(s)
      M. Machida and T. Koyama
    • Journal Title

      Supercond. Sci. Tech 20

      Pages: S23-S27

    • Peer Reviewed
  • [Journal Article] Quantum Dynamics of Spontaneous Magnetic Flux in Closed 0-p Josephson Junctions2007

    • Author(s)
      T. Koyama, M. Machida, M. Kato and T. Ishida
    • Journal Title

      J. Mag. Mag. Mater 310

      Pages: e90-e92

    • Peer Reviewed
  • [Journal Article] Collective Macroscopic Tunneling in Intrinsic Josephson Junctions2007

    • Author(s)
      M. Machida and T. Koyama
    • Journal Title

      Physica C 460

      Pages: 275-276

    • Peer Reviewed
  • [Journal Article] Quantum Dynamics of the Phase-Difference in an Assembly of Closed 0-p Josephson Junctions made by d- and s-wave Superconductors2007

    • Author(s)
      T.Koyama, M. Machida, M. Kato and T. Ishida
    • Journal Title

      Physica C 460

      Pages: 1305-1306

    • Peer Reviewed
  • [Journal Article] Quantum Correction to the Discrete Breather in Capacitively-Coupled Intrinsic Josephson Junctions2007

    • Author(s)
      T. Koyama and M. Machida
    • Journal Title

      Physica C 460

      Pages: 1321-1322

    • Peer Reviewed
  • [Journal Article] Macroscopic Quantum Effect in Intrinsic Josephson Junctions Containing Magnetic Flux2007

    • Author(s)
      T. Koyama, M. Machida, M.Kato and T. Ishida
    • Journal Title

      Physica C 463

      Pages: 985-988

    • Peer Reviewed
  • [Journal Article] Theory for Collective Macroscopic Tunneling in High-Tc Intrinsic Josephson Junctions2007

    • Author(s)
      M. Machida and T. Koyama
    • Journal Title

      Physica C 463

      Pages: 262-265

    • Peer Reviewed
  • [Presentation] テラヘルツ波発振をもたらす固有ジョセフソン接合内の電磁場2009

    • Author(s)
      小山冨男
    • Organizer
      日本物理学会第64回年次大会
    • Place of Presentation
      東京
    • Year and Date
      2009-03-28
  • [Presentation] Theory for THz Emission in Intrinsic Josephson Junctions(invited)2008

    • Author(s)
      T. Koyama
    • Organizer
      International Conference on Theoretical Physics "DUBNA-NANO 2008"
    • Place of Presentation
      Dubna, Russia
    • Year and Date
      20080707-11
  • [Presentation] 2バンド層状超伝導体の集団モード2008

    • Author(s)
      小山冨男
    • Organizer
      日本物理学会2008年秋季大会
    • Place of Presentation
      盛岡
    • Year and Date
      2008-09-20
  • [Presentation] 固有ジョセフソン接合におけるテラヘルツ波発振II2008

    • Author(s)
      小山冨男
    • Organizer
      日本物理学会第63回年次大会
    • Place of Presentation
      大阪
    • Year and Date
      2008-03-26
  • [Presentation] Macroscopic Quantum Tunneling in Intrinsic Josephson Junction Stacks(invited)2007

    • Author(s)
      T. Koyama
    • Organizer
      The 4^<th> CREST-Virtual-Labs Joint Workshop on Superconductivity
    • Place of Presentation
      Kitakyushu, Japan
    • Year and Date
      20071217-18
  • [Presentation] Macroscopic Quantum Effects in Intrinsic Josephson Junction stacks2007

    • Author(s)
      T. Koyama
    • Organizer
      20^<th> International Symposium on Superconductivity
    • Place of Presentation
      Tsukuba, Japan
    • Year and Date
      20071105-07
  • [Presentation] Plasma Excitation in the Superconducting State of Two-Band Layered Superconductors2007

    • Author(s)
      T. Koyama
    • Organizer
      21^<th> International Symposium on Superconductivity
    • Year and Date
      20071027-29
  • [Presentation] Macroscopic Quantum Tunneling in a Stack of Intrinsic Josephson Junctions(invited)2007

    • Author(s)
      T. Koyama
    • Organizer
      Fifth International Conference on Vortex Matter in Nanostructured Superconductors
    • Place of Presentation
      Rhodes, Greek
    • Year and Date
      20070908-14
  • [Presentation] Effects of Capacitive coupling in the Escape Rate in Intrinsic Josephson Junction Stacks2007

    • Author(s)
      T. Koyama
    • Organizer
      Spectroscopies and Novel Superconductors
    • Place of Presentation
      Sendai, Japan
    • Year and Date
      20070820-24
  • [Presentation] Electromagnetic Wave Emission in Intrinsic Josephson Junction Stacks(invited)2007

    • Author(s)
      T. Koyama
    • Organizer
      6^<th>International Symposium on Intrinsic Josephson Effects in High Tc Superconductors
    • Place of Presentation
      Pohang, Korea
    • Year and Date
      20070717-19
  • [Presentation] 固有ジョセフソン接合における第1及び第2ブランチへのMQT2007

    • Author(s)
      小山冨男
    • Organizer
      日本物理学会第62回年次大会
    • Place of Presentation
      札幌
    • Year and Date
      2007-09-24

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Published: 2010-06-10   Modified: 2016-04-21  

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