Evidence for Anisotropic Kondo Behavior in Ce0.8La0.2Al3

TL;DR

This study reveals anisotropic Kondo behavior in Ce0.8La0.2Al3 through neutron scattering, showing a transition from quasi-elastic to inelastic spin response at low temperatures, sensitive to pressure, aligning with anisotropic Kondo model predictions.

Contribution

First detailed neutron scattering evidence of anisotropic Kondo behavior in Ce0.8La0.2Al3, demonstrating pressure-sensitive spin dynamics at low temperatures.

Findings

Transition from quasi-elastic to inelastic spin response below 3 K

Spin dynamics scale with thermodynamic properties

Behavior consistent with anisotropic Kondo model

Abstract

We have performed an inelastic neutron scattering study of the low energy spin dynamics of the heavy fermion compound Ce0.8La0.2Al3 as a function of temperature and external pressure up to 5 kbar. At temperatures below 3 K, the magnetic response transforms from a quasi-elastic form, common to many heavy fermion systems, to a single well-defined inelastic peak, which is extremely sensitive to external pressure. The scaling of the spin dynamics and the thermodynamic properties are in agreement with the predictions of the anisotropic Kondo model.