Abstract
Zero-field muon spin-lattice relaxation rates have been measured in magnetically diluted HoxLu1−xRh4B4 ternary compounds, primarily for x=0.02. For temperatures below ∼11 K a characteristic two-component structure of the muon depolarization function is observed, which is consistent with slow (quasistatic) Ho3+-moment fluctuations. We have reported similar behavior for x=0.7, which indicates that the slow fluctuations are due to crystal-field isolation of the Ho3+ ground state. The observed relaxation rates in this temperature regime depend little on x, which is consistent with conduction-electron (Korringa) exchange scattering as the dominant mechanism for the fluctuations. The observed temperature dependence of muon spin-lattice relaxation in the superconducting state is not presently understood.
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