SUSCEPTIBILITY INHOMOGENEITY AND NON-FERMI-LIQUID BEHAVIOR IN NOMINALLY ORDERED UCU4PD

Muon spin rotation experiments on a stoichiometric sample of the non-F ermi-liquid (NFL) heavy-fermion compound UCu4Pd, in which recent neutr on scattering experiments suggest an ordered structure, indicate that the U-ion susceptibility is strongly inhomogeneous at low temperatures . We argue that this is due to residual disorder, which also dominates NFL behavior. The data yield a short correlation length (less than or similar to 1 lattice spacing) and a rapid low-temperature U-moment re laxation rate (greater than or similar to 10(12) s(-1)), which constra in cluster-based models of NFL behavior. [S0163-1829(98)51242-8].