Abstract
We have attempted to resolve the influence of the rate (dB(a)/dt), at which an external magnetic field B(a) is swept down, on the tensile stress in bulk type-II superconductors. The effect of viscous flux velocity (upsilon(0)) on the stress is discussed for two magnetization processes: the decreasing field after zero-field cooling (ZFC) and the field cooling (FC). With increasing upsilon(0), the maximum tensile stress increases in ZFC and keeps constant in FC when the position x(0), at which the remagnetization front is located, changes. x(0) moves away from the center of the superconductor with increasing upsilon(0). The effect of db(a)/dt, which is a parameter for dB(a)/dt, on the stress is similar to the effect of upsilon(0). These results imply that dB(a)/dt must be considered in the magnetization processes in order to avoid cracking in type-II bulk superconductor.