J. Spalek et al., ALMOST LOCALIZED FERMIONS IN A MAGNETIC-FIELD - DEVIATION FROM THE LANDAU-PICTURE AND A TRANSITION TO NON-FERMI-LIQUID, Physica. B, Condensed matter, 230, 1997, pp. 620-623
We discuss physical properties of almost localized fermions originatin
g from the spin-dependent effective masses, and a nonlinear molecular
field, as well as propose a transition to a non-Fermi liquid at a crit
ical (metamagnetic) field. These features explain in a coherent manner
the observed behavior of the CeRu2Si2 system, regarded as a system of
heavy, quasiparticles close to the Mott localization.