  Muon spin rotation experiments on a stoichiometric sample of the non-Fermi
liquid (NFL) heavy-fermion compound UCu_4Pd, in which recent neutron Bragg
scattering measurements are consistent with an ordered structure, indicate that
the U-ion susceptibility is strongly inhomogeneous at low temperatures. This
suggests that residual disorder dominates NFL behavior. The data also indicate
a short correlation length (\lesssim 1 lattice spacing) for this inhomogeneity
and a rapid low-temperature U-moment relaxation rate (\gtrsim 10^{12} s^{-1}),
which constrain cluster-based models of NFL behavior.
