The influence of the antiferromagnetic order on the superconductor in themixed state results in creation of spin-flop domains along the cores of thevortex lines. It is shown that this phenomenon makes possible crossover fromquantum creep regime to thermal one, and vice versa, at constant temperature.To do this one needs to simply change the intensity or the direction of appliedmagnetic field in the basal ${\bf ab}$ plane of layered structure.
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