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We examine the nuclear spin-lattice relaxation rates $1/T_1$ of PuRhGa$_5$and PuCoGa$_5$, both in the superconducting and normal states, as well as theirKnight shifts. Results for both compounds are consistent with a superconductinggap of d-wave symmetry in the presence of strong impurity scattering, thoughwith quite different gap-over-$T_c$ ratios $2 \Delta_{0}/ k_B T_c$ (8 forPuCoGa$_5$ and 5 for PuRhGa$_5$). In the normal state, PuRhGa$_5$ exhibits agradual suppression of $(T_1 T)^{-1}$ below 25 K, while measurements forPuCoGa$_5$ reveal a monotonic increase down to $T_c$. We propose that thisbehavior is consistently understood by the crossover from the two-dimensionalquantum antiferromagnetic regime of the local $5f$-electron spins of Pu to theconcomitant formation of the fermion pseudogap based on the two-componentspin-fermion model.Comment: 7 pages, 6 figures, minor changes and references adde

physical review. b, condensed matter and materials physics

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Nuclear spin-lattice relaxation rate inPuMGa5(M=Rh,