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Evaluation method for flux pinning properties in the mixed state of superconductors

Research Project

Project/Area Number 18560309
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Electronic materials/Electric materials
Research InstitutionKumamoto University

Principal Investigator

FUJIYOSHI Takanori  Kumamoto University, Graduate School of Science and Thclmology, Professor (80212190)

Co-Investigator(Kenkyū-buntansha) SUEYOSHI Tetsuro  Kumamoto University, Graduate School of Science and Technology, Assistant Professor (20315287)
Project Period (FY) 2006 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥3,700,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥300,000)
Fiscal Year 2007: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2006: ¥2,400,000 (Direct Cost: ¥2,400,000)
KeywordsSuperconductor / Critical current density / Flux pinning / artificial pinning centers / E-J characteristic / nano-structure / ナノ構造人工ピンニングセンター / ナノ構造人工ピン
Research Abstract

1. As-grown MgB_2 thin films on Si substrates with high J_c under magnetic fields were prepared by electron-beam evaporation. The value of J_c has been enhanced by the deposition of MgB_2 thin film in an O_2 atmosphere. The MgB_2 thin film deposited in the O_2 atmosphere O_2-doped film has exhibited considerably higher J_c in magnetic fields among MgB_2 thin films reported before. It has been found that the high J_c of the O_2-doped film is attributable to the flux pinning with grain boundaries strengthened by an introduction of MgO along grain boundaries. In a high magnetic field, a peculiar behavior of E-J characteristics where E-J curves vary in two stages was observed. This behavior also originates from the flux pinning with strengthened grain boundaries.
2. Flux pinning properties in ErBa_2Cu_3O_y and YBa_2Cu_3O_y thin films with BaZrO_3 nano-rods prepared by PLD were measured to investigate the flux pinning mechanism. The enhancement of J_c was confirmed by the measurement of the dependence of J_c on magnetic field. The angular dependence of J_c has a broad peak at B‖c-axis. This result indicates that the BaZrO_3 nano-rods work as the c-axis-correlated pinning centers. The pinning parameter m was evaluated from the electric fields versus current density characteristics and the peak of m appears in the magnetic field dependence. The characteristic behavior of m is caused by the matching of the density of BaZrO_3 nano-rods with that of fluxoids. It is found that the relative distribution width of the local critical current density for the ErBa2Cu_3O_y film with BaZrO_3 nano-rods is smaller than that of the YBa_2Cu_3O_y films with BaZrO_3 nano-rods.

Report

(3 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report
  • Research Products

    (35 results)

All 2008 2007 2006

All Journal Article (12 results) (of which Peer Reviewed: 6 results) Presentation (23 results)

  • [Journal Article] Effect on the aspect ratio of a superconducting tape on the AC loss in perpendicular external magnetic field2008

    • Author(s)
      K. Yamafuji, T. Fujiyoshi, et. al.
    • Journal Title

      Res.Bull.Fukuoka Inst.Tech. 40

      Pages: 199-208

    • NAID

      110006593919

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Effect of the aspect ratio of a superconducting tape on the AC loss in perpendicular external magnetic field2008

    • Author(s)
      K, Yamafuji, T., Fujiyoshi, et. al.
    • Journal Title

      Res. Bull. Fukuoka Inst. Tech.

      Pages: 199-208

    • NAID

      110006593919

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Effect of the aspect ratio of superconducting tape on the AC loss in perpendicular external magnetic field2008

    • Author(s)
      Yamafuji K.
    • Journal Title

      Res.Bull.Fukuoka Inst.Tech. 40

      Pages: 199-208

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] High critical current density under magnetic fields in as-grown MgB_2 thin films deposited by molecular-beam epitaxy2007

    • Author(s)
      M. Haruta, T. Fujiyoshi, et. al.
    • Journal Title

      Supercond.Sci.Technol. 20

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Enhancement of Jc in MgB_2 thin films on Si substrate with pinning centers introduced by deposition in O_2 atmosphere2007

    • Author(s)
      M. Haruta, T. Fujiyoshi, et. al.
    • Journal Title

      J.Appl.Phys. 102

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] High critical current density under magnetic fields in as-grown MgB_2 thin films deposited by molecular-beam epitaxy2007

    • Author(s)
      M., Haruta, T., Fujiyoshi, T., Sueyoshi, et. al.
    • Journal Title

      Supercond. Sci. and Technol. 20

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Enhancement of Jc in MgB_2 thin films on Si substrate with pinning centers introduced by deposition in O_2 atmosphere2007

    • Author(s)
      M., Haruta, T., Fujiyoshi, T., Sueyoshi, et. al.
    • Journal Title

      J. Appl. Phys. 102

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Enhancement of Jc in MgB2 thin films on Si substrate with pinning centers introduced by deposition in O2 atmosphere2007

    • Author(s)
      Haruta M.
    • Journal Title

      Journal of Applied Physics 102

      Pages: 761141-761143

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] High critical current density under magnetic fields in as-grown MgB_2 thin films deposited by molecular-beam epitaxy2007

    • Author(s)
      H.Haruta, T.Fujiyoshi et al.
    • Journal Title

      Superconductor Science and Technology 20・1

      Pages: 11-14

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Flux phinning properies ErBa_2Cu_3O_y thin films BaZrO_3 nanorods2006

    • Author(s)
      M. Haruta, T. Fujiyoshi, et. al.
    • Journal Title

      Supercond.Sci.Technol. 19

      Pages: 803-807

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Flux pinning properties of ErBa_2Cu_3O_y thin films with BaZrO_3 nanorods2006

    • Author(s)
      M., Haruta, T., Fujiyoshi, T., Sueyoshi, et. al.
    • Journal Title

      Supercond. Sci. and Technol. 19

      Pages: 803-807

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Flux pinning properties of ErBa_2Cu_3O_y thin films with BaZrO_3 nanorods2006

    • Author(s)
      H.Haruta, T.Fujiyoshi et al.
    • Journal Title

      Superconductor Science and Technology 19・8

      Pages: 803-807

    • Related Report
      2006 Annual Research Report
  • [Presentation] 電子ビーム蒸着法で作製したMgB_2/Ni積層薄膜の臨界電流密度特性2008

    • Author(s)
      藤吉 孝則
    • Organizer
      第55回2008年度応用物理学会学術講演会
    • Place of Presentation
      船橋市
    • Year and Date
      2008-03-29
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 電子ビーム蒸着法で作製したMgB2/Ni積層薄膜の臨界電流密度特性2008

    • Author(s)
      藤吉 孝則
    • Organizer
      第55回2008年度応用物理学会学術講演会
    • Place of Presentation
      船橋市
    • Year and Date
      2008-03-29
    • Related Report
      2007 Annual Research Report
  • [Presentation] 人工ピンを導入したREBCO薄膜の磁束ピンニング特性2007

    • Author(s)
      藤吉 孝則
    • Organizer
      第77回2007年度秋季低温工学・超電導学会
    • Place of Presentation
      仙台市
    • Year and Date
      2007-11-22
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Annual Research Report 2007 Final Research Report Summary
  • [Presentation] Flux pinning properties of high-Tc superconductors with artificial pinning centers2007

    • Author(s)
      T. Fujiyoshi
    • Organizer
      13th Japan-US Workshop on Advanced Superconductors
    • Place of Presentation
      Gifu,Japan
    • Year and Date
      2007-11-10
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Annual Research Report 2007 Final Research Report Summary
  • [Presentation] Flux pinning properties of high- T_c superconductors with artificial pinning centers2007

    • Author(s)
      T., Fujiyoshi
    • Organizer
      13th Japan-US Workshop on Advanced Superconductors
    • Place of Presentation
      Gifu, Japan
    • Year and Date
      2007-11-10
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Flux pinning properties in YBa_2Cu_3O_<7-δ> multilayered films with second phase prepared by PLD method2007

    • Author(s)
      T. Sueyoshi
    • Organizer
      20th International Symposium on Superconductivity
    • Place of Presentation
      Tsukuba,Japan
    • Year and Date
      2007-11-07
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Flux pinning properties of REBa_2Cu_3O_y thin films with BaZrO_3 nano-rods2007

    • Author(s)
      T. Fujiyoshi
    • Organizer
      20th International Symposium on Superconductivity
    • Place of Presentation
      Tsukuba,Japan
    • Year and Date
      2007-11-07
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Flux pinning properties in YBa_2Cu_3O_7-8 multilayered films with second phase prepared by PLD method2007

    • Author(s)
      T., Sueyoshi
    • Organizer
      20th International Symposium on Superconductivity
    • Place of Presentation
      Tsukuba, Japan
    • Year and Date
      2007-11-07
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Flux pinning properties of REBa_2Cu_3O_y thin films with BaZrO_3 nano-rods2007

    • Author(s)
      T., Fujiyoshi
    • Organizer
      20th International Symposium on Superconductivity
    • Place of Presentation
      Tsukuba, Japan
    • Year and Date
      2007-11-07
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Flux pinning properties in YBa2Cu307 multilayered films with second phase prepared by PLD method2007

    • Author(s)
      Sueyoshi, T.
    • Organizer
      20th International Symposium on Superconductivity
    • Place of Presentation
      Tsukuba,Japan
    • Year and Date
      2007-11-07
    • Related Report
      2007 Annual Research Report
  • [Presentation] Flux pinning properties of REBa2Cu3Oy thin films with BaZrO3 nano-rods2007

    • Author(s)
      Fujiyoshi, T.
    • Organizer
      20th International Symposium on Superconductivity
    • Place of Presentation
      Tsukuba,Japan
    • Year and Date
      2007-11-07
    • Related Report
      2007 Annual Research Report
  • [Presentation] BaZrO_3添加REBa_2Cu_3O_y薄膜の磁束ピンニング特性2007

    • Author(s)
      藤吉 孝則
    • Organizer
      第68回2007年度応用物理学会学術講演会
    • Place of Presentation
      札幌市
    • Year and Date
      2007-09-07
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] BaZrO3添加REBa2Cu30y薄膜の磁束ピンニング特性2007

    • Author(s)
      藤吉 孝則
    • Organizer
      第68回2007年度応用物理学会学術講演会
    • Place of Presentation
      札幌市
    • Year and Date
      2007-09-07
    • Related Report
      2007 Annual Research Report
  • [Presentation] 超伝導混合状態におけるn値とピン力分布の関係2007

    • Author(s)
      藤吉 孝則
    • Organizer
      第76回2007年度春季低温工学・超伝導学会
    • Place of Presentation
      千葉市
    • Year and Date
      2007-05-17
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] PLD法で作製したZnO/YBa_2Cu_3O_<7-δ>多層薄膜の磁束ピンニング特性2007

    • Author(s)
      末吉 哲郎
    • Organizer
      第76回2007年度春季低温工学・超伝導学会
    • Place of Presentation
      千葉市
    • Year and Date
      2007-05-17
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 超伝導混合状態におけるn値とピンカ分布の関係2007

    • Author(s)
      藤吉 孝則
    • Organizer
      第76回2007年度春季低温工学・超電導学会
    • Place of Presentation
      千葉市
    • Year and Date
      2007-05-17
    • Related Report
      2007 Annual Research Report
  • [Presentation] PLD法で作製したZnO/YBa2Cu307多層薄膜の磁束ピンニング特性2007

    • Author(s)
      末吉 哲郎
    • Organizer
      第76回2007年度春季低温工学・超電導学会
    • Place of Presentation
      千葉市
    • Year and Date
      2007-05-17
    • Related Report
      2007 Annual Research Report
  • [Presentation] BZOナノロッドを導入したErBCO薄膜の磁束ピンニング特性(2)2006

    • Author(s)
      藤吉 孝則
    • Organizer
      第75回2006年度秋季低温工学・超電導学会
    • Place of Presentation
      熊本市
    • Year and Date
      2006-11-21
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 1次元ピンを導入したREBaCuO薄膜の磁束ピンニング特性2006

    • Author(s)
      末吉 哲郎
    • Organizer
      平成18年度第59回電気関係学会九州支部連合大会
    • Place of Presentation
      宮崎市
    • Year and Date
      2006-09-27
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] BaZrO_3添加ErBa_2Cu_3O_y薄膜の磁束ピンニング特性2006

    • Author(s)
      藤吉 孝則
    • Organizer
      2006年度秋季第67回応用物理学会学術講演会
    • Place of Presentation
      草津市
    • Year and Date
      2006-08-30
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 人工ピンを導入した高温超伝導薄膜における磁束ピンニング特性2006

    • Author(s)
      末吉 哲郎
    • Organizer
      平成18年電気学会基礎・材料・共通部門大会
    • Place of Presentation
      熊本市
    • Year and Date
      2006-08-21
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] BZO添加量の異なるErBCO薄膜の磁束ピンニング特性2006

    • Author(s)
      藤吉 孝則
    • Organizer
      低温学会九州・西日本支部第1回研究会
    • Place of Presentation
      鹿児島市
    • Year and Date
      2006-07-22
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] BZOナノロッドを導入したErBCO薄膜の磁束ピンニング特性2006

    • Author(s)
      藤吉 孝則
    • Organizer
      第73回2006年度春季低温工学・超電導学会
    • Place of Presentation
      大阪市
    • Year and Date
      2006-05-15
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary

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Published: 2006-04-01   Modified: 2016-04-21  

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