Anisotropic Magnetic Response in Kondo Lattice with Antiferromagnetic Order

TL;DR

This study investigates the anisotropic magnetic response in the antiferromagnetic phase of the Kondo lattice using advanced computational methods, revealing how susceptibilities behave differently depending on the interaction regime.

Contribution

The paper extends the DMFT+CT-QMC approach to derive anisotropic magnetic susceptibilities in the antiferromagnetic phase of the Kondo lattice.

Findings

Transverse susceptibility remains unchanged below transition in RKKY regime.

Longitudinal susceptibility decreases below transition temperature.

Results explain temperature-dependent magnetic susceptibility in CeT$_2$Al$_{10}$ family.

Abstract

Magnetic properties are investigated for the Kondo lattice by using the continuous time quantum Monte Colro (CT-QMC) and the dynamical mean field theory (DMFT). The DMFT+CT-QMC approach is extended so as to derive the anisotropic magnetic response in the antiferromagnetic phase. The longitudinal and transverse magnetic susceptibilities are numerically derived in the antiferromagnetic phase. For the RKKY regime with a small Kondo coupling, the transverse susceptibility does not decrease below the transition temperature while the longitudinal susceptibility decreases as expected from the mean field picture. In the competing region between the RKKY interaction and the Kondo effect, however, both longitudinal and transverse susceptibilities decrease below the transition temperature. The results obtained naturally explain the temperature dependence of the magnetic susceptibility observed in CeT$_2$Al$_{10}$ ($T$=Ru,Os,Fe) family.