Effects of Flux Creep on the Magnetization Curves of High-Temperature Superconductors

The effects of flux creep on the magnetization curves of high-temperature superconductors are investigated numerically for Anderson-Kim model.The pinning energy at zero current density,U_(c),greatly influences the flux penetration process,a larger U_(c),value reults in a larger penetration field.The characteristic of the magnetization curve is also a function of U_(c).The magnetization M and ΔM increase with the increasing U_(c) and depend on the magnetic induction B,so the critical current formula based on Bean model is pot accurate,especially for high-T_(c) superconductor,for which flux creep is a large effect.