Nuclear Magnetic Relaxation in a Dense Kondo Compound CeCu6

Abstract
63 Cu nuclear spin-lattice relaxation rate (1/ T 1 ) has been measured in a dense Kondo compound CeCu 6 . The nuclear relaxation was not expressed by a single exponential time dependence probably because of the many inequivalent Cu sites and/or the anisotropy in 1/ T 1 . The relaxation rate of the Ce magnetic moments (1/τ) deduced from the largest value of 1/ T 1 showed the similar temperature dependence as those in CeAl 3 and CeCu 2 Si 2 obtained from the neutron scattering experiments, but much larger value than these compounds, although considerable ambiguity is present in the estimation of the absolute value of 1/τ.