Fig. 2 | Nature Communications

Fig. 2

From: Stretched and compressed exponentials in the relaxation dynamics of a metallic glass-forming melt

Fig. 2

The dependence of the vibrational features on connectivity k. a The frequency of the high- and low-frequency modes, ωH and ωL, increases with increasing k. q = 2.8 Å−1. b The frequency ωH, averaged over all k values, is basically independent of the wave-vector q showing that this is an optical mode, whereas the low-frequency mode at ωL(q) increases linearly with q, characteristic of an acoustic mode. Error bars in a, b have been obtained from the fit of the SISF with Eq. (2). c Vibrational density of states for the different populations showing that the highly connected icosahedra have on average higher frequencies

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