title: Lifshitz transition in Kondo alloys.
abstract: We study the low-energy states of Kondo alloys as a function of the magnetic impurity concentration per site x and the conduction electron average site occupation n(c). Using two complementary approaches, the mean-field coherent potential approximation and the strong-coupling limit, we identify and characterize two different Fermi-liquid regimes. We propose that both regimes are separated by a Lifshitz transition at x=n(c). Indeed, we predict a discontinuity of the number of quasiparticles that are enclosed in the Fermi surface. This feature could provide a scenario for the non-Fermi liquid properties that were recently observed in Kondo alloy systems around x=n(c).
authors.affiliation: Université Bordeaux, LOMA, UMR 5798, F-33400 Talence, France.
authors.forename: Sébastien
authors.initials: S
authors.lastname: Burdin
authors.forename: Claudine
authors.initials: C
authors.lastname: Lacroix