Kondo engineering : from single Kondo impurity to the Kondo lattice

TL;DR

This paper explores the progression from single Kondo impurities to Kondo lattices, emphasizing the role of the occupation number and phase diagrams in understanding complex correlated electron systems.

Contribution

It introduces the concept that the occupation number $n_f$ is a key variable in Kondo lattice physics, extending insights from impurity studies to lattice systems.

Findings

Kondo temperature is crucial in impurity behavior

Occupation number $n_f$ influences lattice properties

Phase diagrams reveal different behaviors in studied compounds

Abstract

In the first step, experiments on a single cerium or ytterbium Kondo impurity reveal the importance of the Kondo temperature by comparison to other type of couplings like the hyperfine interaction, the crystal field and the intersite coupling. The extension to a lattice is discussed. Emphasis is given on the fact that the occupation number $n_f$ of the trivalent configuration may be the implicit key variable even for the Kondo lattice. Three $(P, H, T)$ phase diagrams are discussed: CeRu$_2$Si$_2$, CeRhIn$_5$ and SmS.