  We calculated the Knight shift and spin-lattice relaxation rates of Pu-115
compounds assuming d-wave superconductivity in the presence of strong impurity
scattering. We discuss the implications for recent measurements of the
spin-lattice relaxation rate in the Pu-115 compound PuRhGa5 by Sakai and
coworkers [J. Phys. Soc. Jpn. 74, 1710 (2005)] and present a prediction for the
corresponding Knight shift. In addition, we noticed a significant round-off of
the spin-lattice relaxation rate 1/T1 just above the superconducting transition
temperature that is not observed in the sister compound PuCoGa5. It appears
that in PuRhGa5 superconductivity is mediated by spin fluctuations, too. This
provides additional support to the scenario of superconducting pairing mediated
by spin fluctuations in the Pu-115 compounds similar to the Ce-115 compounds
and the high-temperature copper-oxide superconductors.
