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The experimental critical temperature of systems of nanoparticlessuperconducting (Pb) and normal (Ag, Cu and Al) with a random distribution andsizes less than their respective coherence lengths, is governed by proximityeffect as the experimental data shown. At first glance the behaviour of thevariation of the critical temperature in function of the ratio of the volumefractions of the superconducting and the normal metal components seems tosuggest a weak coupling behaviour for the superconductor. In reality, upon amore careful analysis using Eliashberg's theory for the proximity effect, thesystem instead shows a strong coupling nature. The most interesting thing isthat the theory has no free parameters and perfectly explains the behavior ofthe experimental data just with the assumption, in the cases of nanoparticlesof $Ag$ and $Cu$, that the value of the density of states at the Fermi level ofsilver and copper is equal to value of lead.

Strong-coupling Behaviour of Critical Temperature of Pb/Ag, Pb/Cu and Pb/Al Nanocomposites Explained by Proximity Eliashberg Theory