Kondo quasiparticle dynamics observed by resonant inelastic x-ray scattering

Abstract

Effective models focused on pertinent low-energy degrees of freedom have substantially contributed to our qualitative understanding of quantum materials. An iconic example, the Kondo model, was key to demonstrating that the rich phase diagrams of correlated metals originate from the interplay of localized and itinerant electrons. Modern electronic structure calculations suggest that to achieve quantitative material-specific models, accurate consideration of the crystal field and spin-orbit interactions is imperative. This poses the question of how local high-energy degrees of freedom become incorporated into a collective electronic state. Here, we use resonant inelastic x-ray scattering (RIXS) on CePd${}_3$ to clarify the fate of all relevant energy scales. We find that even spin-orbit excited states acquire pronounced momentum-dependence at low temperature - the telltale sign of hybridization with the underlying metallic state. Our results demonstrate how localized electronic degrees of freedom endow correlated metals with new properties, which is critical for a microscopic understanding of superconducting, electronic nematic, and topological states.

References in corpus (8)

• Quantum phases driven by strong correlations
• Modelling the Localized to Itinerant Electronic Transition in the Heavy Fermion System CeIrIn5
• Visualizing heavy fermions emerging in a quantum critical Kondo lattice
• Electronic in-plane symmetry breaking at field-tuned quantum criticality in CeRhIn5
• Hidden order and beyond: an experimental-theoretical overview of the multifaceted behavior of URu${}_2$Si${}_2$
• The simultaneous measurement of energy and linear polarization of the scattered radiation in resonant inelastic soft x-ray scattering
• The quartet ground state in CeB${}_6$: an inelastic x-ray scattering study
• Kondo quasiparticle dynamics observed by resonant inelastic x-ray scattering

Cited by in corpus (4)

• Kondo quasiparticle dynamics observed by resonant inelastic x-ray scattering
• A microscopic Kondo lattice model for the heavy fermion antiferromagnet CeIn${}_3$
• Charge fluctuations in the intermediate-valence ground state of SmCoIn${}_5$
• Fingerprints of Mott and Slater gaps in the core-level photoemission spectra of antiferromagnetic iridates