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 dynamical magnetic susceptibility chi''(omega,T) and measurements of the static susceptibility chi(T) and electrical resistivity rho(T) in the uranium intermetallics UCu5-xPdx (x = 1, 1.5). For temperatures T and excitation energies omega in the range 12 K < omega, T < 150 K, our analysis demonstrates that the dynamics of isolated uranium ions are responsible for the observed temperature and frequency scaling, although interion interactions may become important at lower temperatures and frequencies. We derive a strict criterion for single-ion scaling in the form of a universal scaling function, providing a model-independent description of the compiled experimental data.