Inhomogeneous Superconductivity Seen in Intrinsic Josephson Junctions of High Temperature Superconductors and Its Control

• Project/Area Number: 18560011
• 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: Kyoto University
• Principal Investigator: SUZUKI Minoru Kyoto University, 大学院・工学研究科, 教授 (10314238)
• Project Period (FY): 2006 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥3,950,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥450,000); Fiscal Year 2008: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2007: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2006: ¥2,000,000 (Direct Cost: ¥2,000,000)
• Keywords: 超伝導体 / 超伝導材料・素子 / トンネル現象 / 低温物性 / 強相関電子系 / 固有ジョセフソン接合 / トンネル分光 / 不均一超伝導状態 / ドープ量依存性

Research Abstract

ビスマス系高温超伝導体の結晶構造に自然に存在する固有ジョセフソン接合を用い、高温超伝導体に存在する可能性のある超伝導性の空間的不均一性とその制御の可能性について検討した。キャリアドープ量が少ない不足ドープ領域では、最大ジョセフソン電流密度が極めて小さいことから、空間的な不均一性があることを示した。またその理由を示した。またドープ量を多くすることにより最大ジョセフソン電流密度を著しく大きくできることを示した。

Research Products

• [Journal Article] Comparative study of macroscopic quantum tunneling in Bi_2Sr_2CaCu_2O_y intrinsic Josephson junctions with different device strucures (2009)
  • Author(s): K. Ota, K. Hamada, R. Takemura, M. Omaki, T.Machi, K. Tanabe, M. Suzuki, A. Maeda, and H. Kitano
  • Journal Title: Phys. Rev. B vol.79
  • Peer Reviewed
• [Journal Article] Significantly doping-dependent Josephson critical currentInhomogeneity in real space or heterogeneity in k-space (2009)
  • Author(s): M. Suzuki, T. Hamatani, Y. Yamada, K. Anagawa, and T. Watanabe
  • Journal Title: J. Phys. Conf. Ser vol.150
  • 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, K. Ota, K. Hamada, R. Takemura, M. Ohmaki, A. Maeda, and M. Suzuki
  • Journal Title: J. Phys. Conf. Ser vol.150
  • Peer Reviewed
• [Journal Article] Macroscopic quantum tunneling and thermal activation in a small mesa structured Bi2Sr2CaCu2Oy intrinsic Josephson junctions (2009)
  • Author(s): H. Kitano, K. Ota, K. Hamada, R. Takemura, M. Ohmaki, A. Maeda, M. Suzuki
  • Journal Title: J. Phys. Conf. Ser. 150
  • Peer Reviewed
• [Journal Article] Significantly doping-dependent Josephson critical current-Inhomogeneity in real space or heterogeneity in k-space (2009)
  • Author(s): M. Suzuki, T. Hamatani, Y. Yamada, K. Anagawa, T. Watanabe
  • Journal Title: J. Phys. Conf. Ser. 150
  • Peer Reviewed
• [Journal Article] Comparative study of macroscopic quantum tunneling in Bi2Sr2CaCu2Oy intrinsic Josephson junctions with different device strucures (2009)
  • Author(s): K. Ota, K. Hamada, R. Takemura, M. Ohmaki, T. Machi, K. Tanabe, M. Suzuki, A. Maeda, H. Kitano
  • Journal Title: Phys. Rev. B 79
  • Peer Reviewed
• [Journal Article] Structure of the breakpoint on current-voltage characteristics of intrinsic Josephson junctions (2008)
  • Author(s): Yu. M. Shukrinov, F. Mahfouzi, and M. Suzuki
  • Journal Title: Phys. Rev. B vol.78
  • Peer Reviewed
• [Journal Article] Tunneling characteristics for nm-thick mesas consisting of a few intrinsic Josephson junctions (2008)
  • Author(s): M. Suzuki, M. Ohmaki, R. Takemura, K. Hamada, T. Watanabe, K. Ota, H. Kitano, and A. Maeda
  • Journal Title: J. Phys. Conf. Ser vol.129
  • Peer Reviewed
• [Journal Article] SIN feature observed in intrinsic Josephson junction characteristics for overdoped Bi_2Sr_2CaCu_2O_<8+δ> (2008)
  • Author(s): M. Suzuki, R. Takemura, M. Ohmaki, and K. Anagawa
  • Journal Title: J. Phys. Conf. Ser vol.97
  • Peer Reviewed
• [Journal Article] SIN feature observed in intrinsic Josephson junction characteristics for overdoped Bi2Sr2CaCu2O8+δ (2008)
  • Author(s): M. Suzuki, R. Takemura, M. Ohmaki, K. Anagawa
  • Journal Title: J. Phys. Conf. Ser. 97
  • Peer Reviewed
• [Journal Article] Tunneling characteristics for nm-thick mesas consisting of a few intrinsic Josephson junctions (2008)
  • Author(s): M. Suzuki, M. Ohmaki, R. Takemura, K. Hamada, T. Watanabe, K. Ota, H. Kitano, A. Maeda
  • Journal Title: J. Phys. Conf. Ser. 129
  • Peer Reviewed
• [Journal Article] structure of the breakpoint on current-voltage characteristics of intrinsic Josephson junctions (2008)
  • Author(s): Yu. Shukrinov, F. Mahfouzi, M. Suzuki
  • Journal Title: Phys. Rev. B 78
  • Peer Reviewed
• [Journal Article] Systematic transport properties and their doping dependences for Bi_2Sr_2CaCu_2O_<8+δ> single crystals in a wide doping range (2007)
  • Author(s): Y. Yamada, T. Watanabe, and M. Suzuki
  • Journal Title: Physica C vol.460-462 Pages: 815-816
  • Peer Reviewed
• [Journal Article] Fabrication and transport properties forcleaved thin film BSCCO single crystals (2007)
  • Author(s): Y. Yamada, T. Watanabe, and M. Suzuki
  • Journal Title: IEEE Trans. Appl. Supercond vol.17 Pages: 3533-3536
  • Peer Reviewed
• [Journal Article] Fabrication of small mesa structures of Bi_2Sr_2CaCu_2O_<8+δ> intrinsic Josephson junctions using polyimide process : Improvement of current-voltage characteristics with a very small number of junctions (2007)
  • Author(s): R. Takemura, T. Kumano, M. Ohmaki, T. Watanabe, and M. Suzuki
  • Journal Title: Jpn. J. Appl. Phys vol.46 Pages: 5788-5791
  • Peer Reviewed
• [Journal Article] Direct observation of the intrinsic Josephson junction characteristics in electron-doped Sm_<2-x>Ce_xCuO_<4-δ> (2007)
  • Author(s): T. Kawakami, and M. Suzuki
  • Journal Title: Phys. Rev. B vol.76
  • Peer Reviewed
• [Journal Article] Self-heating due to injection of quasiparticle current in small mesa structures made of intrinsic Josephson junctions in BSCCO (2007)
  • Author(s): M. Suzuki, Y. Yamada, E. Tajitsu, S. Kojima, and K. Anagawa
  • Journal Title: IEEE Trans. Appl. Supercond vol.17 Pages: 594-597
  • Peer Reviewed
• [Journal Article] Anomalously strong doping dependence of the maximum Josephson current in intrinsic Josephson junctions and inhomogeneous supercnducting state in Bi2Sr2CaCu208+δ (2007)
  • Author(s): M. Suzuki, Y. Yamada, T. Hamatani, K. Anagawa, and T. Watanabe
  • Journal Title: Physica C 460-462 Pages: 386-387
  • Peer Reviewed
• [Journal Article] Self-heating due to injection of quasiparticle current in small mesa structures made of intrinsic Josephson (2007)
  • Author(s): M. Suzuki, Y. Yamada, E. Tajitsu, S. Kojima, and K. Anagawa
  • Journal Title: IEEE Trans. Appl. Supercond. 17 Pages: 594-597
  • Peer Reviewed
• [Journal Article] Direct observation of the intrinsic Josephson junction characteristics in electron-doped Sm2-xCexCu04-d (2007)
  • Author(s): T. Kawakami and M. Suzuki
  • Journal Title: Phys. Rev. B 76
  • Peer Reviewed
• [Journal Article] Fabrication of small mesa structures of Bi2Sr2CaCu208+δ intrinsic Josephson junctions using polyimide process: Improvement of current-voltage characteristics with a very small number of junctions (2007)
  • Author(s): R. Takemura, T. Kumano, M. Ohmaki, T. Watanabe, and M. Suzuki
  • Journal Title: Jpn. J. Appl. Phys. 46 Pages: 5688-5791
  • Peer Reviewed
• [Journal Article] Fabrication and transport properties for cleaved thin film BSCCO single crystals (2007)
  • Author(s): Y. Yamada, T. Watanabe, and M. Suzuki
  • Journal Title: IEEE Trans. Appl. Supercond. 17 Pages: 3533-3536
  • Peer Reviewed
• [Journal Article] Anomalously strong doping dependence of the maximum Josephson current in intrinsic Josephson junctions and inhomogeneous supercnducting state in Bi_2Sr_2CaCu_2O_<8+δ> (2006)
  • Author(s): M. Suzuki, Y. Yamada, T. Hamatani, K. Anagawa, and T. Watanabe
  • Journal Title: Physica C vol.460-462 Pages: 386-387
  • Peer Reviewed
• [Journal Article] Interlayer tunneling spectroscopy for deeply underdoped Bi_2Sr_2CaCu_2O_<8+δ> : Spectroscopic evidence for inhomogeneous superconductivity (2006)
  • Author(s): Y. Yamada, and M. Suzuki
  • Journal Title: Phys. Rev.B vol.74
  • Peer Reviewed
• [Journal Article] Maximum Josephson current and inhomogeneous superconductivity in Bi_<2-x>Pb_xSr_2CaCu_2O_<8+δ> (2006)
  • Author(s): M. Suzuki, T. Hamatani, Y. Yamada, K. Anagawa, and T. Watanabe
  • Journal Title: J. Phys. Conf. Ser vol.43 Pages: 1110-1113
  • Peer Reviewed
• [Journal Article] Pseudogap in electron-doped superconducting Sm_<2-x>Ce_xCuO_<4-δ> by interlayer magnetotransport (2006)
  • Author(s): T. Kawakami, T. Shibauchi, Y. Terao, and M. Suzuki
  • Journal Title: Phys. Rev. B vol.74
  • Peer Reviewed
• [Journal Article] Superconducting gap and pseudogap for overdoped Bi_<2-x>Pb_xSr_2CaCu_2O_<8+δ> using 60 ns time-scale short-pulse interlayer tunneling spectroscopy (2006)
  • Author(s): K. Anagawa, T. Watanabe, and M. Suzuki
  • Journal Title: Phys. Rev. B vol.73 Pages: 184512-7
  • Peer Reviewed
• [Journal Article] Superconducting gap and pseudogap for overdoped Bi2-xPbxSr2CaCu2O8+d using 60 ns time-scale short-pulse (2006)
  • Author(s): K.Anagawa, T.Watanabe, M.Suzuki
  • Journal Title: Phys. Rev. B 73(18)
• [Journal Article] Pseudogap in electron-doped superconducting Sm2-xCexCuO4-d by interlayer magnetotransport (2006)
  • Author(s): T.Kawakami, T.Shibauchi, Y.Terao, M.Suzuki
  • Journal Title: Phys. Rev. B 74(14)
• [Journal Article] Maximum Josephson current and inhomogeneous superconductivity in Bi2Sr2CaCu2O8+d (2006)
  • Author(s): M.Suzuki, T.Hamatani, Y.Yamada, K.Anagawa, T.
  • Journal Title: J. Phys. Conf. Ser. 43 Pages: 1110-1113
• [Journal Article] Interlayer tunneling spectroscopy for deeply underdoped Bi2Sr2CaCu208+d : Spectroscopic evidence for inhomogeneous (2006)
  • Author(s): Y.Yamada, M.Suzuki
  • Journal Title: Phys. Rev. B 74(7)
• [Presentation] 過剰ドープBi2-xPbxSr2CaCu2O8+δ固有ジョセフソン接合に見られるJcの改善とそのスイッチング特性 (2008)
  • Author(s): 濱田憲治, 大牧正幸, 竹村亮太, 掛谷一弘, 鈴木実
  • Organizer: 第7回低温工学・超伝導若手合同講演会
  • Place of Presentation: 大阪市立大学文化交流センター
  • Year and Date: 2008-12-12
• [Presentation] Bi2201劈開単結晶薄膜の広範囲ドープ量制御と輸送特性 (2008)
  • Author(s): 高丸泰, 掛谷一弘, 鈴木実
  • Organizer: 第7回低温工学・超伝導若手合同講演会
  • Place of Presentation: 大阪市立大学文化交流センター
  • Year and Date: 2008-12-12
• [Presentation] Switching current distribution in Bi2212 IJJ mesa structures with various areas (2008)
  • Author(s): K. Hamada, et. al.
  • Organizer: 21st International Symposium on Superconductivity
  • Place of Presentation: Tsukuba, Japan
  • Year and Date: 2008-10-29
• [Presentation] Switching probability distribution and tunneling spectra in small mesa structures with a few intrinsic Josephson junctions of BSCCO cuprates (2008)
  • Author(s): I. Kakeya, et. al.
  • Organizer: 21st International Symposium on Superconductivity
  • Place of Presentation: Tsukuba, Japan
  • Year and Date: 2008-10-28
• [Presentation] Switching probability distribution and tunneling spectra in small mesa structures with a few intrinsic Josephson junctions of BSCCO cuprates (2008)
  • Author(s): I. Kakeya, R. Takemumra, M. Ohmaki, K. Ota, H. Kitano, T. Watanabe, A. Maeda, M. Suzuki
  • Organizer: 1st International Symposium on Superconductivity
  • Place of Presentation: Tsukuba, Japan
  • Year and Date: 2008-10-28
• [Presentation] 過剰ドーフPb-Bi2212固有接合の微小メサ構造作製とその特性評価 (2008)
  • Author(s): 濱田憲治, 掛谷一弘, 鈴木実
  • Organizer: 第69回応用物理学学術講演会
  • Place of Presentation: 中部大学
  • Year and Date: 2008-09-05
• [Presentation] Bi2-xPbxSr2-yLayCuO6+δの輸送特性のドープ量依存性 (2008)
  • Author(s): 高丸泰, 掛谷一弘, 鈴木実
  • Organizer: 第69回応用物理学学術講演会
  • Place of Presentation: 中部大学
  • Year and Date: 2008-09-05
• [Presentation] Significantly doping-dependent Josephson current-Inhomogeneity in real space or heterogeneity in k-space (2008)
  • Author(s): M. Suzuki, et. al.
  • Organizer: 25th International Conference on Low Temperature PhysicsPhysics (LT25)
  • Place of Presentation: Amsterdam, Netherland
  • Year and Date: 2008-08-12
• [Presentation] Significantly doping-dependent Josephson critical current-Inhomogeneity in real space or heterogeneity in k-space (2008)
  • Author(s): M. Suzuki, T. Hamatani, Y. Yamada, K. Anagawa, T. Watanabe
  • Organizer: 25th International Conference on Low Temperature Physics
  • Place of Presentation: Amsterdam, Netherland
  • Year and Date: 2008-08-12
• [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: 25th International Conference on Low Temperature Physics (LT25)
  • Place of Presentation: Amsterdam, Netherland
  • Year and Date: 2008-08-08
• [Presentation] Macroscopic Quantum tunneling and thermal activation in a small mesa structured Bi2Sr2CaCu2Oy intrinsic Josephson junctions (2008)
  • Author(s): H. Kitano, K. Ota, K. Hamada, R. Takemura, M. Ohmaki, A. Maeda, M. Suzuki
  • Organizer: 25th International Conference on Low Temperature Physics
  • Place of Presentation: Amsterdam, Netherland
  • Year and Date: 2008-08-08
• [Presentation] Fabrication of small mesas consisting of a few intrinsic Josephson junctions and their tunneling characteristics (2008)
  • Author(s): M. Suzuki, et. al.
  • Organizer: 6th International Symposium on Intrinsic Josephson Effect in High-T_c Superconductors
  • Place of Presentation: POSTECH, Pohang, Korea
  • Year and Date: 2008-07-18
• [Presentation] Fabrication of small mesas consisting of a few intrinsic Josephson junctions and their tunneling characteristics (2008)
  • Author(s): M. Suzuki, K. Hamada, R. Takemura, M. Ohmaki, T. Watanabe, K. Ota, H. Kitano, A. Maeda
  • Organizer: 6th International Symposium on Intrinsic Josephson Effect in High Tc Superconductors
  • Place of Presentation: Pohang, Korea
  • Year and Date: 2008-07-18
• [Presentation] Tunneling characteristics for nano-mm thick small mesa structures consisting of a few intrinsic Josephson junctions (2008)
  • Author(s): M. Suzuki, et. al.
  • Organizer: International Conference on Theoretical PhysicsPhysics (Dubna-Nano 2008)
  • Place of Presentation: Dubna, Russia
  • Year and Date: 2008-07-10
• [Presentation] Tunneling characteristics for nm-thick mesas consisting of a few intrinsic Josephson junctions (2008)
  • Author(s): M. Suzuki, K. Hamada, R. Takemura, M. Ohmaki, T. Watanabe, K. Ota, H. Kitano, A. Maeda
  • Organizer: International Conference on Theoretical Physics, Dubna-Nano 2008
  • Place of Presentation: Dubna, Russia
  • Year and Date: 2008-07-10
• [Presentation] 電子ビームを用いたBi2Sr2CaCu208+δ固有ジョセフソン接合の極微小メサ構造作製とMQTの観察 (2007)
  • Author(s): 濱田憲治, 大牧正幸、竹村亮太、渡辺孝夫, 鈴木実、太田健介、北野晴久、前田京剛
  • Organizer: 第6回低温工学・超伝導若手合同講演会
  • Place of Presentation: 大阪市立大学文化交流センター
  • Year and Date: 2007-12-11
• [Presentation] Bi2Sr2CaCu208+微小メサ構造作製と固有トンネル分光に見られるSIN特性 (2007)
  • Author(s): 竹村亮太、大牧正幸、濱田憲治, 渡辺孝夫, 鈴木実
  • Organizer: 第6回低温工学・超伝導若手合同講演会
  • Place of Presentation: 大阪市立大学文化交流センター
  • Year and Date: 2007-12-11
• [Presentation] SIN feature observed in intrinsic Josephson junctions characteristics for overdoped Bi_2Sr_2CaCu_2O_<8+δ> (2007)
  • Author(s): M. Suzuki, et. al.
  • Organizer: European Conference on Applied Superconductivity 2007
  • Place of Presentation: Brussel, Belgium
  • Year and Date: 2007-09-20
• [Presentation] SIN feature observed in intrinsic Josephson junctions characteristics for overdoped Bi2Sr2CaCu208+d (2007)
  • Author(s): M. Suzuki, R. Takemura, M. Ohmaki, K. Anagawa, T. Hamatani, and T. Watanabe
  • Organizer: European Conference on Applied Superconductivity 2007
  • Place of Presentation: Brussel, Belgium
  • Year and Date: 2007-09-20
• [Presentation] Bi2Sr2CaCu208+d固有トンネル分光におけるピークの磁場依存性 (2007)
  • Author(s): 竹村亮太、大牧正幸、濱田憲治, 渡辺孝夫, 鈴木実
  • Organizer: 第68回応用物理学会学術講演会4p-ZF-5
  • Place of Presentation: 北海道工業大学
  • Year and Date: 2007-09-04
• [Presentation] 微小メサ型Bi2Sr2CaCu208+d固有ジョセフソン接合のIc確率分布と脱出温度 (2007)
  • Author(s): 濱田憲治, 大牧正幸、竹村亮太, 渡辺孝夫, 鈴木実
  • Organizer: 第68回応用物理学会学術講演会4p-ZE-8
  • Place of Presentation: 北海道工業大学
  • Year and Date: 2007-09-04
• [Presentation] Bi2-xPbxSr2-yLayCuO6+dの固有トンネル分光特性 (2007)
  • Author(s): 高丸泰, 車谷幸二, 鈴木実
  • Organizer: 第68回応用物理学会学術講演会4p-ZF-6
  • Place of Presentation: 北海道工業大学
  • Year and Date: 2007-09-04
• [Presentation] Self-heating I small mesa structures made of intrinsic Josephson junctions in BSCCO (2006)
  • Author(s): M. Suzuki, et. al.
  • Organizer: Applied Superconductivity Conference 2006
  • Place of Presentation: Seattle, USA
  • Year and Date: 2006-08-28
• [Presentation] Fabrication and transport properties for cleaved thin film BSCCO single crystals (2006)
  • Author(s): Y. Yamada, et. al.
  • Organizer: Applied Superconductivity Conference 2006
  • Place of Presentation: Seattle, USA
  • Year and Date: 2006-08-28
• [Presentation] Anomalously strong doping dependence of the maximum Josephson current in intrinsic Josephson junctions and inhomogeneous superconducting state in Bi_2Sr_2CaCu_2O_<8+δ> (2006)
  • Author(s): M. Suzuki, et. al.
  • Organizer: 8th International Conference on Materials and Mechanisms of SuperconductivitySuperconductivity (M^2S 2006)
  • Place of Presentation: Dresden, Germany
  • Year and Date: 2006-07-13
• [Presentation] Systematic transport properties and their doping dependencies for Bi_2Sr_2CaCu_2O_<8+δ> single crystals in a wide doping range (2006)
  • Author(s): Y. Yamada, et. al.
  • Organizer: 8th International Conference on Materials and Mechanisms of SuperconductivitySuperconductivity (M^2S 2006)
  • Place of Presentation: Dresden, Germany
  • Year and Date: 2006-07-13