  Systems that have been prepared to undergo a second-order phase transition at
zero Kelvin, the so-called quantum critical systems, appear to fall into two
categories: (chemically) heavily-doped systems where the unusual properties can
be related to a disorder-induced distribution of Kondo shielding temperatures,
and (almost) stoichiometric systems where the departures from Fermi-liquid
theory have been attributed to intrinsic instabilities. Here we show that this
distinction is not as clear cut and that magnetic clusters associated with a
distribution of Kondo shielding temperatures are also present in
CeRu$_2$Si$_2$, a system close to a quantum critical point. By revisiting
published data on this system and comparing them to the results for
heavily-doped quantum critical Ce(Ru$_{0.755}$Fe$_{0.245}$)$_2$Ge$_2$, we show
that clusters exist in both systems at low temperatures, and that the moments
of the Ce-ions within these clusters have all lined up with their neighbors.
This implies that the dominant physics that drives heavily-doped systems,
namely spontaneous formation of magnetic clusters, should also play a leading
role in the response of homogenous systems. This represents a notable departure
of how the physics that governs quantum critical points is treated in the
literature.
