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We use angle-resolved photoemission spectroscopy (ARPES) to image theemergence of substaintial dispersion anomalies in the electronicrenormalization of the actinide compound UCoGa$_5$ which was presumed to belongto a conventional Fermi liquid family. Kinks or abrupt breaks in the slope ofthe quasiparticle dispersion are detected both at low ($\sim$130 meV) and high($\sim$1 eV) binding energies below the Fermi energy, ruling out anysignificant contribution of phonons. We perform numerical calculations todemonstrate that the anomalies are adequately described by coupling betweenitinerant fermions and spin fluctuations arising from the particle-holecontinuum of the spin-orbit split $5f$ states of uranium. These anomalies areresemble the `waterfall' phenomenon of the high-temperature copper-oxidesuperconductors, suggesting that spin fluctuations are a generic route towardmultiform electronic phases in correlated materials as different ashigh-temperature superconductors and actinides.

Imaging the formation of high-energy dispersion anomalies in the actinide UCoGa$_5$