Crossover from dilute-Kondo system to heavy-fermion system

Abstract

Ground state properties of a Kondo lattice model with random configuration of $f$ electrons are investigated with a variational Monte Carlo method. We show that the crossover from a dilute-Kondo system to a heavy-fermion system occurs when the density of $c$ and $f$ electrons ($n_c$, $n_f$) become comparable, $n_f\lesssim n_c$. In the heavy-fermion region, the correlation between $f$ electrons is strong and the $f$ electrons themselves greatly contribute to the screening of other $f$-electron moments. We propose that the character of Kondo screening changes from "individual" to "collective" across the crossover.

5 pages, 4 figures, submitted to Phys. Rev. Lett

References in corpus (5)

• Fermi Surface Reconstruction without Breakdown of Kondo Screening at Quantum Critical Point
• Strongly Inhomogeneous Phases and Non-Fermi Liquid Behavior in Randomly Depleted Kondo Lattices
• Random Kondo Alloys
• Influence of disorder on the transport properties of heavy-fermion systems
• Two-fluid behavior of the Kondo lattice in the 1/N slave boson approach

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• Breakdown of coherence in Kondo alloys: crucial role of concentration vs band filling
• Site Specific Knight Shift Measurements of the Dilute Kondo lattice System Ce${}_{1-x}$La${}_x$CoIn${}_5$
• Photo-emission signatures of coherence breakdown in Kondo alloys: dynamical mean-field theory approach