FERMI-LIQUID DESCRIPTION FOR ITINERANT-ELECTRON MAGNETISM

On the basis of the Fermi liquid model the magnetic susceptibility chi(T) for paramagnetic or ferromagnetic metals carrying itinerant electrons is evaluated as a function of temperature. We use an exact expression for chi(T) in terms of Landau's Fermi liquid function. By varying the interaction strength we obtain chi(T) curves which qualitatively represent the experimental data for prototype substances Pd, Y2Ni7, ZrZn2 and Ni. The present model explains the concurrence of susceptibility maximum and Curie-Weiss susceptibility in nearly ferromagnetic metals, the appearance of thermally induced ferromagnetism, and precise Curie-Weiss law for relatively weak ferromagnets.