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

Yu-Hao Liu, Wei Xie, Hai-Hu Wen

By measuring the dynamical and conventional magnetization relaxation of the Ba${}_{0.64}$K${}_{0.36}$Fe${}_2$As${}_2$ single crystals, we found strong second peak effect on the magnetizati…