On the identification of fermi-liquid behavior in simple transition metal compounds

The status of Fermi liquid behavior in weakly magnetic transition metal compounds is reviewed. Single-crystals of the weak itinerant ferromagnets ZrZn ₂, Ni ₃Al, and YNi ₃ display a non-Fermi liquid (NFL) temperature dependence of the resistivity consistent with an inhomogenous ferromagnetic state. But at high-magnetic fields they exhibit quantum oscillations of a Fermi liquid ground state. On the other hand, the helical magnet MnSi displays a pronounced change from a Fermi liquid to NFL resistivity under pressure, where a small regime of partial magnetic order in the NFL regime suggests unconventional textures driven by an unpinning of the helical order. But the stability of the chiral interactions under pressure and magnetic field points at a more complex origin of the NFL behavior.