Universal behavior in heavy fermions

We analyze several experimental results, obtained at different pressures, on three heavy-fermion systems using a quantum scaling approach. In spite of the distinct ground states attained by CeRu₂{Si}₂$, ${UPt}₃$, and ${CeAl}₃$, the crossover into the dense Kondo regime and the renormalized Fermi-liquid state of these materials in this regime, below the coherence line, is shown to exhibit universal behavior. This is associated with the proximity of these systems to a zero-temperature instability.