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

Abstract

We use angle-resolved photoemission spectroscopy (ARPES) to image the emergence of substaintial dispersion anomalies in the electronic renormalization of the actinide compound UCoGa${}_5$ which was presumed to belong to a conventional Fermi liquid family. Kinks or abrupt breaks in the slope of the quasiparticle dispersion are detected both at low ($\sim$130 meV) and high ($\sim$1 eV) binding energies below the Fermi energy, ruling out any significant contribution of phonons. We perform numerical calculations to demonstrate that the anomalies are adequately described by coupling between itinerant fermions and spin fluctuations arising from the particle-hole continuum of the spin-orbit split $5f$ states of uranium. These anomalies are resemble the `waterfall' phenomenon of the high-temperature copper-oxide superconductors, suggesting that spin fluctuations are a generic route toward multiform electronic phases in correlated materials as different as high-temperature superconductors and actinides.

arXiv comment10 pages including supplementary material, Accepted for publication in PRX

References in corpus (14)

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Cited by in corpus (6)

• Colloquium: Topological Band Theory
• Fermi Surface Topology and Hotspots Distribution in Kondo Lattice System CeB6
• Advances in actinide thin films: synthesis, properties, and future directions
• Theory of nodal s+- wave pairing symmetry in the Pu-based 115 superconductor family
• Quantum Critical Point revisited by the Dynamical Mean Field Theory
• Self-consistent spin-fluctuation spectrum and correlated electronic structure of actinides