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Scaling Law on the temperature and magnetic field dependence of critical current density in the mixed state of superconductors

Research Project

Project/Area Number 15560279
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

FUJIYOSI Takanori  Kumamoto University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (80212190)

Co-Investigator(Kenkyū-buntansha) SUEYOSHI Tetsuro  Kumamoto University, Graduate School of Science and Technology, Assistant Professor, 大学院・自然科学研究科, 助手 (20315287)
Project Period (FY) 2003 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2005: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2004: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2003: ¥2,100,000 (Direct Cost: ¥2,100,000)
KeywordsSuperconductor / Critical current density / Scaling law / Electric transport property / nano-structure artificial pinning / columnar defect / 電圧-電流特性 / 高温超伝導体
Research Abstract

1. A theoretical expression for the dependences on the temperature, T, and the flux density, B, of the critical current density, J_c, observed at the value of the electric field E=E_c in the high temperature cuprate superconductors was derived by using a generalized theory of the Glass-Liquid Transition proposed by us, under the assumption that the scaling law of E against J near the G-L Transition can be approximately applied down to fairly low temperatures. It is shown that the derived expression for the scaling law for the T and B dependences of J_c in the high temperature cuprate superconductors is noticeably different from that for the metallic superconductors.
2. We have studied the effect of the densities of columnar defects on pinning parameters in YBa_2Cu_3O_7 thin films prepared by the PLD method with the transport measurements. In order to produce the defects artificially in a controlled manner, the heavy-ions were irradiated onto the films. The critical current density J_c i … More ncreases with the doses of the irradiation due to the introduction of the strong pinning sites into samples. These results could be described by the percolation model as a variation of pinning strength distribution affected from the induced defects.
3. ErBa_2Cu_3O_y (ErBCO) thin films with BaZrO_3(BZO) nano-rods were prepared by a PLD method for an enhancement of critical current density J_c. The values of J_c for the ErBCO thin film containing 1.5wt% BZO (Er15) in magnetic fields are higher than those for the ErBCO thin film containing 0.5wt% BZO (Er05). The peaks of J_c have been observed in the angular dependence of J_c in both the films when the magnetic field is applied parallel to the c-axis. It has been found that the peak is attributed to the flux pinning by BZO nano-rods oriented parallel to the c-axis. The peak of the pinning parameter has been observed in the magnetic field dependence. This fact is probably due to the matching the density of BZO nano-rods with that of fluxoids, which was confirmed by TEM observations. Less

Report

(4 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • Research Products

    (37 results)

All 2005 2004 2003 Other

All Journal Article (31 results) Book (2 results) Publications (4 results)

  • [Journal Article] Relaxation of the magnetization in the pinning state of high-T_c superconductors2005

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

      Physica C 424

      Pages: 29-39

    • NAID

      10013400859

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Effect of inclined magnetic filed on pinning parameters in YBaCuO thin films with columnar defect2005

    • Author(s)
      T.Sueyoshi et al.
    • Journal Title

      Physica C 424

      Pages: 153-158

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Effect of controlled densities of columnar defects on pinning parameters in YBa_2Cu_3O_7-2 thin films2005

    • Author(s)
      T.Sueyoshi et al.
    • Journal Title

      Physica C 426-431

      Pages: 83-87

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] E-J characteristics of MgB_2 thin films prepared by electron beam evaporation method2005

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

      Physica C 426-431

      Pages: 174-178

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Critical current density of MgB_2 thin film with pinning centres introduced by deposition in oxygen atmosphere2005

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

      Superconductor Science and Technology 18

      Pages: 1460-1463

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] 電子ビーム蒸着法により作製したMgB2薄膜におけるピンニング特性の印加磁場角度依存性2005

    • Author(s)
      春田正和 他
    • Journal Title

      低温工学 40

      Pages: 473-478

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Relaxation of the magnetization in the pinning state of high-T_c superconductors2005

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

      Physica C Vol.424

      Pages: 29-39

    • NAID

      10013400859

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Effect of inclined magnetic field on pinning parameters in YBaCuO thin films with columnar defect2005

    • Author(s)
      T.Sueyoshi et al.
    • Journal Title

      Physica C Vol.424

      Pages: 153-158

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Effect of controlled densities of columnar defects on pinning parameters in YBa_2Cu_3O_<7-δ> thin films2005

    • Author(s)
      T.Sueyoshi et al.
    • Journal Title

      Physica C Vol.426-431

      Pages: 83-87

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] The E-J characteristics of MgB_2 thin film prepared by electron beam evaporation method2005

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

      Physica C Vol.426-431

      Pages: 174-178

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Critical current density of MgB_2 thin film with pinning centres introduced by deposition in oxygen atmosphere2005

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

      Superconductor Science and Technology Vol.18, No.11

      Pages: 1460-1463

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Angular dependence of pinning properties of MgB_2 thin films prepared by an electron-beam evaporation method2005

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

      Journal of Cryogenic Society of Japan Vol.40 No.11

      Pages: 473-478

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Critical state model2005

    • Author(s)
      Kaoru Yamafuji, Takanori Fujiyoshi
    • Journal Title

      Critical Currents in Superconductors, Captor 4 (Eds. T.Takizawa and M.Murakami) (Fuzambo International)

      Pages: 47-69

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Effect of controlled densities of columnar defects on pinning parameters in YBa_2Cu_3O_<7-δ> thin films2005

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

      Physica C 424

      Pages: 153-158

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Effect of inclined magnetic field on pinning parameters in YBCuO thin films with columnar defects2005

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

      Physica C 426-431

      Pages: 83-87

    • Related Report
      2005 Annual Research Report
  • [Journal Article] E-J characteristics of MgB_2 thin films prepared by electron beam evaporation method2005

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

      Physica C 426-431

      Pages: 174-178

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Critical current density of MgB_2 thin film with pinning centers introduced by deposition in oxygen atmosphere2005

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

      Superconductor Science and Technology 18・11

      Pages: 1460-1463

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 電子ビーム蒸着法により作製したMgB2薄膜におけるピンニング特性の印加磁場角度依存性2005

    • Author(s)
      春田正和, 藤吉孝則他
    • Journal Title

      低温工学 40・11

      Pages: 473-478

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Effect of inclined magnetic field on pinning parameters in YBCO thin films with columnar defects2005

    • Author(s)
      Tetsuro Sueyoshi et al.
    • Journal Title

      Physica C (in press)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] The E-J characteristics of MgB_2 thin films prepared by electron beam evaporation method2005

    • Author(s)
      Masakazu Haruta et al.
    • Journal Title

      Physica C (in press)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Relaxation of the magnetization in the pinning state of high-T_c superconductors2005

    • Author(s)
      Takanori Fujiyoshi et al.
    • Journal Title

      Physica C (in press)

    • NAID

      10013400859

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Dose effect heavy-ion irradiation on the critical exponents in YBa_2Cu_3O_7-x thin films2004

    • Author(s)
      T.Sueyoshi et al.
    • Journal Title

      Physica C 412-414

      Pages: 497-501

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Influence of columnar defects on pinning parameters in high-Tc superconductors2004

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

      Physica C 412-414

      Pages: 511-514

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Dose effect heavy-ion irradiation on the critical exponents in YBa_2Cu_3O_<7-x> thin films2004

    • Author(s)
      T.Sueyoshi et al.
    • Journal Title

      Physica C Vol.412-414

      Pages: 497-501

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Influence of columnar defects on pinning parameters in high-T_c superconductors2004

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

      Physica C Vol.412-414

      Pages: 511-514

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Dose effect of heavy-ion irradiation on the critical exponents in YBa_2Cu_3O_7 thin films2004

    • Author(s)
      Tetsuro Sueyoshi et al.
    • Journal Title

      Physica C 412-414

      Pages: 497-501

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Influence of columnar defects on pinning parameters in high-T_c superconductors2004

    • Author(s)
      Masakazu Haruta et al.
    • Journal Title

      Physica C 412-414

      Pages: 511-514

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Influence of the columnar defect densities on the current-voltage characteristics in high-T_c superconductors2003

    • Author(s)
      T.Sueyoshi et al.
    • Journal Title

      Physica C 388-389

      Pages: 739-740

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] A theory of the thermal depinning transition in type-2 superconductors2003

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

      Physica C 397

      Pages: 132-150

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Influence of the columnar defect densities on the current-voltage characteristics in high-T_c superconductors2003

    • Author(s)
      T.Sueyoshi et al.
    • Journal Title

      Physica C Vol.388-389

      Pages: 739-740

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] A theory of the thermal depinning transition in type-2 superconductors2003

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

      Physica C Vol.397

      Pages: 132-150

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Book] Critical Currents in Superconductors (Chapter 4)2005

    • Author(s)
      K.Yamafuji, T.Fujiyoshi
    • Publisher
      Fuzambo International
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Book] Critical Currents in Superconductors(Chapter 4)2005

    • Author(s)
      K.Yamafuji, T.Fujiyoshi
    • Publisher
      Fuzambo International
    • Related Report
      2005 Annual Research Report
  • [Publications] Tetsuro Sueyoshi et al.: "Influence of the columnar defect densities on the current-voltage Characteristics in high-T_c superconductors"Physica C. 388-389. 739-740 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Kaoru Yamafuji et al.: "A theory of the thermal depinning transition in type-2 superconductors"Physica C. 397. 132-150 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Masakazu Haruta et al.: "Influence of columnar defects on the pinning parameters in high-T_c superconductors"Physica C. in press.

    • Related Report
      2003 Annual Research Report
  • [Publications] Tetsuro Sueyoshi et al.: "Doses effect of heavy-ion on the critical exponents in YBa_2Cu_3O_<7-x> thin films"Physica C. in press.

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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