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Disorder-Driven Non-Fermi-Liquid Behavior in CeRhRuSi_2

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arxiv cond-mat/9909215 v1 pith:HDVBQWNZ submitted 1999-09-14 cond-mat.str-el

Chia-Ying Liu , D. E. MacLaughlin , A. H. Castro Neto , H. G. Lukefahr , J. D. Thompson , J. L. Sarrao , Z. Fisk This is my paper · ORCID
classification cond-mat.str-el
keywords behaviordisorder-drivenmagneticbulkcerhrusilinewidthnon-fermi-liquidsusceptibility
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We report measurements of the bulk magnetic susceptibility and ^{29}Si nuclear magnetic resonance (NMR) linewidth in the heavy-fermion alloy CeRhRuSi_2. The linewidth increases rapidly with decreasing temperature and reaches large values at low temperatures, which strongly suggests the wide distributions of local susceptibilities \chi_j obtained in disorder-driven theories of non-Fermi-liquid (NFL) behavior. The NMR linewidths agree well with distribution functions P(\chi) 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 P(\chi) as \chi \to \infty, suggesting the absence of strong magnetic response at low energies. Our results indicate the need for an extension of some current theories of disorder-driven NFL behavior in order to incorporate this low-temperature crossover.

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