Disorder-driven non-Fermi-liquid behavior in CeRhRuSi2
Abstract
We report measurements of the bulk magnetic susceptibility and (Formula presented) nuclear magnetic resonance (NMR) linewidth in the heavy-fermion alloy (Formula presented) The linewidth increases rapidly with decreasing temperature and reaches large values at low temperatures, which strongly suggests the wide distributions of local susceptibilities (Formula presented) obtained in disorder-driven theories of non-Fermi-liquid (NFL) behavior. The NMR linewidths agree well with distribution functions (Formula presented) which fit bulk susceptibility and specific-heat data. The apparent return to Fermi-liquid behavior observed below 1 K is manifested in the vanishing of (Formula presented) as (Formula presented) indicating the absence of strong magnetic response at low energies. Our results point out the need for an extension of some current theories of disorder-driven NFL behavior in order to incorporate this low-temperature crossover. © 2000 The American Physical Society.
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