Abstract
It is shown that statistical fluctuations in the distribution of impurity atoms adsorbed at dislocations lead to the existence of a dislocation-mobility threshold with a magnitude σth dependent on temperature and interaction between impurities. In the low-temperature region, σth can significantly exceed the pinning-stress magnitude σpin determined by the average concentration of adsorbed impurities. The results of the calculation can also be used when describing the kinetics of one-dimensional systems of another physical nature.
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