NON-FERMI-LIQUID SCALING IN UCU5-XPDX (X = 1, 1.5) - A PHENOMENOLOGICAL DESCRIPTION

We present a unified description of the imaginary part of the dynamica l magnetic susceptibility chi''(omega,T) and measurements of the stati c susceptibility chi(T) and electrical resistivity rho(T) in the urani um intermetallics UCu5-xPdx (x = 1, 1.5). For temperatures T and excit ation energies omega in the range 12 K < omega, T < 150 K, our analysi s demonstrates that the dynamics of isolated uranium ions are responsi ble for the observed temperature and frequency scaling, although inter ion interactions may become important at lower temperatures and freque ncies. We derive a strict criterion for single-ion scaling in the form of a universal scaling function, providing a model-independent descri ption of the compiled experimental data.