Magnetic correlations and the quantum critical point of UCu5-Pd-x(x) (x = 1, 1.5) - art. no. 197205

We have used inelastic neutron scattering to determine the magnetic suscept ibility chi (q, omega, T) of the non-Fermi-liquid compounds UCu5-xPdx(x = 1 , 1.5) for energies omega between 0.2 and 2 meV, and for temperatures T bet ween 1.6 and 250 K. Spatial correlations in both UCu4Pd and UCu3.5Pd1.5 ext end over length scales comparable to the unit cell, and display very little temperature dependence. In contrast, the wave vector independent susceptib ility diverges as T --> 0. We find that the excitations at all q, and for a ll T and omega accessed display the same type of non-Fermi-liquid omega /T scaling.