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.