Kondo Breakdown as a Selective Mott Transition in the Anderson Lattice

TL;DR

This paper demonstrates a Kondo breakdown quantum critical point in the Anderson lattice model, revealing a selective Mott transition that separates local-moment and Kondo-screened phases, with implications for heavy fermion materials.

Contribution

It provides the first evidence of a selective Mott transition within the Anderson lattice, linking Kondo breakdown to a Mott transition without magnetic order.

Findings

Identification of a Kondo breakdown quantum critical point at zero temperature.

Demonstration of a selective Mott transition in the Anderson lattice.

Implications for heavy fermion compounds without magnetic order.

Abstract

We show within the slave boson technique, that the Anderson lattice model exhibits a Kondo breakdown quantum critical point (KB-QCP) where the hybridization goes to zero at zero temper- ature. At this fixed point, the f-electrons experience as well a selective Mott transition separating a local-moment phase from a Kondo-screened phase. The presence of a multi-scale QCP in the An- derson lattice in the absence of magnetism is discussed in the context of heavy fermion compounds. This study is the first evidence for a selective Mott transition in the Anderson lattice.