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We present first-principles multiband spin susceptibility calculations withinthe random-phase approximation for four isostructural superconductingPuCoIn$_5$, PuCoGa$_5$, PuRhGa$_5$, and nonsuperconducting UCoGa$_5$ actinides.The results show that a strong peak in the spin-fluctuation dressed self-energyis present around 0.5 eV in all materials, which is mostly created by 5$f$electrons. These fluctuations couple to the single-particle spectrum and giverise to a peak-dip-hump feature, characteristic of the coexistence of itinerantand localized electronic states. Results are in quantitative agreement withphotoemission spectra. Finally, we show that the studied actinides can beunderstood within the rigid-band filling approach, in which thespin-fluctuation coupling constant follows the same materials dependence as thesuperconducting transition temperature $T_c$.

Spin-fluctuations and the peak-dip-hump feature in the photoemission spectrum of actinides