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Susceptibility inhomogeneity and non-Fermi liquid behavior in nominally ordered UCu_4Pd

D. E. MacLaughlin·R. H. Heffner·G. J. Nieuwenhuys·G. M. Luke·Y. Fudamoto·Y. J. Uemura·R. Chau·M. B. Maple·B. Andraka
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Abstract

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.

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D. E. MacLaughlin, R. H. Heffner, G. J. Nieuwenhuys, G. M. Luke, Y. Fudamoto, Y. J. Uemura, R. Chau, M. B. Maple, B. Andraka. 1998-09-17. Susceptibility inhomogeneity and non-Fermi liquid behavior in nominally ordered UCu_4Pd. https://doi.org/10.1103/physrevb.58.r11849

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