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Using molecular dynamics simulation, we calculate the distribution of atomicjum ps in Cu$_{33}$Zr$_{67}$ in the liquid and glassy states. In both statesthe distribution of jump lengths can be described by a temperature independentexponential of the length and an effective activation energy plus acontribution of elastic displacements at short distances. Upon cooling thecontribution of shorter jumps dominates. No indication of an enhancedprobability to jump over a nearest neighbor distance was found. We find asmooth transition from flow in the liquid to jumps in the g lass. Thecorrelation factor of the diffusion constant decreases with decreasingtemperature, causing a drop of diffusion below the Arrhenius value, despite anapparent Arrhenius law for the jump probability

physical review b

Diffusion and jump-length distribution in liquid and amorphous<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:mn>33</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Zr</mml:mi><mml:mn>67</mml:mn></mml:msub></mml:mrow></mml:math>

Diffusion and jump-length distribution in liquid and amorphousCu33Zr67