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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science

Background:

  • Heavy-fermion compounds exhibit complex electronic properties.
  • Understanding the interplay between Kondo physics and crystal-electric-field effects is crucial.

Purpose of the Study:

  • To measure the quasiparticle weight in CeCu$_{6-x}$Au$_{x}$ (x=0, 0.1) across a wide temperature range.
  • To elucidate the role of Kondo scale and crystal-electric-field states in heavy band formation.

Main Methods:

  • Time-resolved terahertz spectroscopy to probe quasiparticle dynamics.
  • Distinguishing Kondo and crystal-electric-field band contributions via terahertz response.
  • Temperature-dependent dynamical mean-field theory calculations.

Main Results:

  • Quasiparticle weight was measured from 2 K to 300 K.
  • Heavy Kondo band formation is governed by an exponentially enhanced Kondo scale.
  • This control is significant when crystal-electric-field states become thermally occupied.

Conclusions:

  • The study reveals a key mechanism controlling heavy band formation in these materials.
  • Findings provide insights into quantum-critical phenomena in heavy-fermion systems.
  • Corroboration with theoretical calculations strengthens the conclusions.