中国物理B ›› 2000, Vol. 9 ›› Issue (2): 141-148.doi: 10.1088/1009-1963/9/2/012

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SIMULATION ON LOCAL FLUX CREEP IN TYPE-Ⅱ SUPERCONDUCTORS

聂惠芬, 刘宇峰, 黄奕梅, 阎守胜   

  1. Department of Physics, Peking University, Beijing 100871, China
  • 收稿日期:1999-08-03 修回日期:1999-09-09 出版日期:2000-02-15 发布日期:2005-06-10
  • 基金资助:
    Project supported by the National Center for Research & Development on Superconductivity of China.

SIMULATION ON LOCAL FLUX CREEP IN TYPE-Ⅱ SUPERCONDUCTORS

Nie Hui-fen (聂惠芬), Liu Yu-feng (刘宇峰), Huang Yi-mei (黄奕梅), Yan Shou-sheng (阎守胜)   

  1. Department of Physics, Peking University, Beijing 100871, China
  • Received:1999-08-03 Revised:1999-09-09 Online:2000-02-15 Published:2005-06-10
  • Supported by:
    Project supported by the National Center for Research & Development on Superconductivity of China.

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摘要： Using C programming language, we have simulated the flux creep process in nonideal type-Ⅱ superconductors. Global and local magnetization curves are calculated and the logarithmic time dependence of local magnetic induction B under a constant external field is examined. The effects of nonuniform pinning potential and self-organized criticality (SOC) model on the simulations are discussed. The results show that the main feature of flux creep is the relaxation effect. The form of hysteresis loops is dependent on the magnetic field sweep rate. SOC can account for the occurrence of fluctuation to a certain extent and nonuniform pinning potential can enhance the fluctuation.

Abstract: Using C programming language, we have simulated the flux creep process in nonideal type-Ⅱ superconductors. Global and local magnetization curves are calculated and the logarithmic time dependence of local magnetic induction B under a constant external field is examined. The effects of nonuniform pinning potential and self-organized criticality (SOC) model on the simulations are discussed. The results show that the main feature of flux creep is the relaxation effect. The form of hysteresis loops is dependent on the magnetic field sweep rate. SOC can account for the occurrence of fluctuation to a certain extent and nonuniform pinning potential can enhance the fluctuation.

中图分类号:  (Occurrence, potential candidates)

  • 74.10.+v
74.25.Ha (Magnetic properties including vortex structures and related phenomena) 75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects)