Susceptibility inhomogeneity and non-Fermi liquid behavior in nominally   ordered UCu_4Pd
  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. 
D. E. MacLaughlin (1,2), R. H. Heffner (1), G. J. Nieuwenhuys (3), G.   M. Luke (4), Y. Fudamoto (4), Y. J. Uemura (4), R. C...