The de Haas-van Alphen effect in Kondo systems with crystalline electric field

TL;DR

This paper investigates the de Haas-van Alphen effect in Kondo systems with crystalline electric fields, revealing how magnetic fields influence effective mass and spin-dependent properties in these materials.

Contribution

It provides a theoretical analysis of effective mass behavior in Kondo systems under magnetic fields, highlighting differences between dilute and periodic systems and spin dependencies.

Findings

Effective mass diverges as magnetic field decreases.

Mass enhancement per Ce ion is consistent in dilute and periodic systems.

Effective mass varies significantly between spin orientations.

Abstract

The effective mass probed by the de Haas-van Alphen oscillations is studied for a model Ce system under magnetic field higher than the Kondo energy. In the mean-field theory, the mass enhancement per Ce ion in the periodic system is identical with that in the dilute system. With decreasing magnetic field, the effective mass tends to diverge corresponding to a formation of the Kondo ground state. The effective mass can be very different between up and down spins depending on the nature of the 4f wave functions.