Figure 6
From: The influence of phonon softening on the superconducting critical temperature of Sn nanostructures

(a) The phonon density of states was combined with α2(E) to obtain α2(E) g(E)/E for the Sn cluster-assembled film and the island samples in comparison to bulk Sn. (b) The phonon density of states was combined with α2(E) and replotted as α2(E) g(E)E for the different Sn nanostructures and the 119Sn reference foil.