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RESEARCH ON MAGNETIZATION AND ABNORMALY OF PIN-POTENTIAL IN HIGH-TEMPERATURE OXIDE SUPERCONDUCTORS

Research Project

Project/Area Number 09650373
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Electronic materials/Electric materials
Research InstitutionKYUSHU-SANGYO UNIVERSITY

Principal Investigator

SAKAMOTO Nobuyoshi  FAC.ENGINEERING,ELECTRI-CAL ENG., PROFESSOR, 工学部・電気工学科, 教授 (80069509)

Co-Investigator(Kenkyū-buntansha) AKUNE Tadahiro  FAC.ENGINEERING,ELECTRI-CAL ENG., ASSOCIATE PROFESSOR, 助教授 (00104860)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1998: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1997: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsOXIDE SUPERCONDUCTOR / MAGNETIC RELAXATION / HIGH-TEMPERATURE MAGNETIZATION / PIN POTENTIAL / ピンポテンシャル / 酸化物超伝導体
Research Abstract

Barrier height for the flux creep increases with the temperature T, although the pinning potential is expected to decrease with increasing T.This anomaly was explained qualitatively by Welch by means of nonlinear potential barrier U(J) where the current J around which the analysis is centered decreases at high T and accordingly the nonlinearity leads to high pinning barrier energy at high T.To confirm this mechanism, U(J) relation of a wide range of J is required. By cooling a superconductor magnetized at higher temperature T_0 + DELTAT to an operating temperature T_0(High-Temperature Magnetization : HTM), low magnetization current J states equivalent to those after long-time creep are realized. The combination of the HTM method and the HaIl voltage measurement attached to YBaCuO superconductor gives the magnetic relaxation curve in a wide range of J.These creep curves are analyzed in details with the simulation based on the creep equation. The observation-window is enlarged by HTM method and the nature of the current dependent pinning potentials is discussed.
Simulation of the flux creep is performed and compared with the magnetic relaxation after hightemperature magnetization.
1. From short-time observations after HTM, offset creep curves equivalent to several months creep characteristics are obtained by smoothly connecting each creep curve after HTM.
2. Simulated characteristics are favorably compared with both the suppressed creep curves after HTM and the offset creep curves.
3. The potential depth U_0 estimated from the offset creep curves shows that U_0 increases as the temperature reduces.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (22 results)

All Other

All Publications (22 results)

  • [Publications] N.Sakamoto: "Pinning Potential Estimated from High-Temperature Magnetization (II)" Advances in Superconductivity. 9. 551-554 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] N.Sakamoto: "Reversible Fluxoid Motion in Superconducting Fullerene Rb_3C_60" Proceedings of the 16th ICEC/ICMC. 1561-1564 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 坂本進洋: "高温励磁後の磁化緩和特性" 超伝導科学研究センター報告. 5. 108-115 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] N.Sakamoto: "Modeling the Flux Creep Characteristics of High Tc Superconductors" Advances in Cryogenic Engineering (Materials). 44B. 617-622 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] N.Sakamoto: "Flux Creep and Pinning Potential in Superconducting Fullerene Rb_3C_60" Proceedings of 17th ICEC. 563-566 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Akune: "Excess Magnetization in NbTi Multifilamentary Wires with CuNi Matrix" Advances in Superconductivity. 10. 873-876 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] N.Sakamoto: "Pinning Potential Estimated from High-Temperature Magnetization (II)" Advances in Superconductivity. 9. 551-554 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] N.Sakamoto: "Reversible Fluxoid Motion in Superconducting Fullerene Rb_3C_6O" Proceedings of the 16th ICEC/ICMC. 1561-1564 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] N.Sakamoto: "Modeling the Flux Creep Characteristics of High Tc Superconductors" Advances in Cryogenic Engineer-ing (Materials). 44B. 617-622 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] N.Sakamoto: "Flux Creep and Pinning Potential in Superconducting Fullerene Rb_3C_6O" Proceedings of 17th ICEC. 563-566 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Akune: "Excess Magnetization in NbTi Multifilamentary Wires with CuNi Matrix" Advances in Superconductivity. 10. 873-876 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] N.Sakamoto: "Pinning Potential Estimated from High-Temperature Magnetization(II)" Advances in Superconductivity. 9. 551-554 (1997)

    • Related Report
      1998 Annual Research Report
  • [Publications] N.Sakamoto: "Reversible Fluxoid Motion in Superconducting Fullerene Rb_3C_60" Proceedings of the 16th ICEC/ICMC. 1561-1564 (1997)

    • Related Report
      1998 Annual Research Report
  • [Publications] 坂本進洋: "高温励磁後の磁化緩和特性" 超伝導科学研究センター報告. 5. 108-115 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] N.Sakamoto: "Modeling the Flux Creep Characteristics of High Tc Superconductors" Advances in Cryogenic Engineering(Materials). 44B. 617-622 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] N.Sakamoto: "Flux Creep and Pinning Potential in Superconducting Fullerene Rb_3C_60" Proceedings of 17th ICEC. 563-566 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Akune: "Excess Magnetization in NbTi Multifilamentary Wires with CuNi Matrix" Advances in Superconductivity. 10. 873-876 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] N.Sakamoto: "Modeling the Flux Creep Characteristics of High-Te Superconductors" Advances in Cryogenic Engineering - Materials. 44(印刷中). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] N.Sakamoto: "Pinning Potential of Superconductors Estimated from High-Temperature Magnetization" Advances in Superconductivity. 2. 551-554 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 坂本進洋: "高温励磁後の磁化緩和特性" 超伝導科学研究センター報告. 5. 108-115 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Akune: "Excess Magnetization in NbTi Multifilamentary Wires with CuNi Matrix" ISS '97 Tenth International Symposium on Superconductivity. WBP-42(印刷中). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] A.Matsuda: "Pinning Properties in Superconducting Pb-Bi Alloys" ISS '97 Tenth International Symposium on Superconductivity. FPP-36(印刷中). (1998)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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