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What does the muon spin-relaxation rate measure in 4f paramagnets with strong crystal fields and weak inter-site correlations?

We investigate the physical meaning of the longitudinal muon spin-relaxation rate measured for a paramagnet at temperatures high with respect to the magnetic phase transition temperature. The depolarization rate is shown to be a function of the relaxation rates of the quasi-elastic and inelastic magnetic excitations. Using this analysis, we consider recently published data recorded on the strongly correlated electron systems CeNiSn and .