Susceptibility inhomogeneity and non-Fermi liquid behavior in nominally ordered UCu4Pd
D. E. MacLaughlin, R. H. Heffner, G. J. Nieuwenhuys, G. M. Luke, Y. Fudamoto, Y. J. Uemura, R. Chau, M. B. Maple, B. Andraka
Abstract
Muon spin rotation experiments on a stoichiometric sample of the non-Fermi liquid (NFL) heavy-fermion compound UCu4Pd, 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 ( 1 lattice spacing) for this inhomogeneity and a rapid low-temperature U-moment relaxation rate ( 1012 s-1), which constrain cluster-based models of NFL behavior.
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