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By measuring the dynamical and conventional magnetization relaxation of theBa$_{0.64}$K$_{0.36}$Fe$_2$As$_2$ single crystals, we found strong second peakeffect on the magnetization hysteresis loops. It is found that there is a kinkof magnetization at a field between the valley and maximum magnetization.Interestingly, the magnetization relaxation rate has a deep minimum at thefield with the kink, indicating a diminished vortex creep. The relaxation rateat this field is clearly smaller than the so-called universal lower limit ofthe relaxation rate characterized by ($S_0\approx \ Gi^{1/2}(T/T_\mathrm{c}$).This diminished vortex creep is associated with the origin of the SMP effectand attributed to the strongly hindered flux motion when experiencing thetransition from the quasi-ordered to disordered vortex phases.

Vanishing vortex creep at the transition from ordered to disordered vortex phases in Ba$_{0.64}$K$_{0.36}$Fe$_2$As$_2$