Abstract
Zero and longitudinal field muon spin relaxation measurements have been performed on the Kondo lattice system CeAgSb 2 in the magnetically ordered ( T<10 K) and paramagnetic ( T>10 K) states. The resulting spectra are consistent with a single muon site which senses a unique coherent internal field of 53 mT at low temperatures and dynamic atomic fields, arising from extremely rapid RKKY-dominated paramagnetic fluctuations of the Ce 3+ spins, at higher temperatures. Small stepwise increases in the temperature dependence of the muon relaxation rate at 60 and 17 K appear to be coincident with the Kondo temperature and the onset of coherence, respectively.
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