ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
New μSR measurements of Ho-ion dynamics in HoxLu1−xRh4B4 are reported for x=0.02 and 0.005. These compounds are superconducting below Tc(approximately-equal-to)11 K. The measured concentration dependence of the Ho3+ spin-lattice relaxation rate Γ0 is consistent with single-ion, conduction electron scattering (the Korringa mechanism) as the dominant process. Above about 10 K, Γ0 is activated with an energy of 66 K, about 1/2 of the overall crystal-field splitting. Below about 10 K (in the superconducting state) a more gradual temperature dependence is observed, as reported previously for x=0.70 and x=0.02. This temperature dependence is not consistent with the usual exponential decay in the superconducting state. Using a model of conduction-electron-exchange scattering which includes the full crystal-field potentials, we show that a reasonably quantitative understanding of the overall temperature dependence can be achieved.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.335173
Permalink