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Field-induced local Fermi-liquid states in the underscreened Kondo model for Eu compounds

Shingo Kuniyoshi, Ryousuke Shiina

SciPost Phys. Proc. 11, 015 (2023) · published 6 June 2023

Proceedings event

International Conference on Strongly Correlated Electron Systems


We have studied an underscreened Kondo model for the impurity spin $S=7/2$ capturing the $4f$ characteristics of a nearly divalent Eu ion. By using the numerical renormalization group method, it is shown that an unusual heavy-fermion state is induced from the underscreened spin state when a weak crystal field is introduced. It is also found that the application of the magnetic field enhances the effective mass of the heavy fermions, reflecting the field-induced level crossing of the spin states. We will discuss the mechanism of these mass enhancements in terms of a realization of the two-stage Kondo effect.

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