Fermi volume evolution and crystal field excitations in heavy-fermion compounds probed by time-domain terahertz spectroscopy

Abstract

We measure the quasiparticle weight in the heavy-fermion compound CeCu${}_{6-x}$Au${}_x$ ($x=0,0.1$) by time-resolved THz spectroscopy for temperatures from 2 up to 300\,K. This method distinguishes contributions from the heavy Kondo band and from the crystal-electric-field satellite bands by different THz response delay times. We find that the formation of heavy bands is controlled by an exponentially enhanced, high-energy Kondo scale once the crystal-electric-field states become thermally occupied. We corroborate these observations by temperature-dependent dynamical mean-field calculations for the multi-orbital Anderson lattice model and discuss consequences for quantum critical scenarios.

arXiv commentPublished version, 6 pages (including references), 5 figures, Supplemental Material (2 pages) added

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Cited by in corpus (11)

• Heavy-electron quantum criticality and single-particle spectroscopy
• Ultrafast Laser Driven Many-Body Dynamics and Kondo Coherence Collapse
• Critical slowing down of fermions near a magnetic quantum phase transition
• Terahertz Conductivity of Heavy-fermion Systems from Time-resolved Spectroscopy
• Transport Spectroscopy of the Field Induced Cascade of Lifshitz Transitions in YbRh2Si2
• Ultrafast Optical Control of Magnetic Order and Fermi Surface Topology at a Quantum Critical Point
• Magnetism trends in doped Ce-Cu intermetallics in the vicinity of quantum criticality: realistic Kondo lattice models based on dynamical mean-field theory
• Missing spectral weight in a heavy-fermion system far above Néel temperature
• Kondo coherence versus superradiance in THz radiation-driven heavy-fermion systems
• Dimensionality tuning of heavy-fermion states in ultrathin CeSi2 films
• Distinct effect of Kondo physics on crystal field splitting in electron and spin spectroscopies