Anomalous Behavior of the Spin Susceptibility of Strongly Correlated Fermi Systems

Abstract

The spin susceptibility $\chi (T)$ of strongly correlated Fermi systems is investigated in the density region where Fermi-liquid theory fails. We attribute this failure to a specific quantum phase transition associated with a rearrangement of the Landau state at low temperatures $T$, retaining the assumption that the Landau quasiparticle picture survives in a generic sense. Taking into account the resulting modification of the quasiparticle istribution function, the spin susceptibility $\chi (T)$ is shown to contain a Curie-Weiss component ${\chi }_{\mathrm{CW}}(T)\sim (T-{\Theta }_{\mathrm{W}}{)}^{-1}$, with the Weiss temperature ${\Theta }_{\mathrm{W}}$ vanishing at the critical density for the transition.

4 pages, 3 figures