Strange metal behavior from incoherent carriers scattered by local moments

We study metallic transport in an effective model that describes the coupling of electrons to fluctuating magnetic moments with full SU(2) symmetry, exhibiting characteristic behavior of metals at the approach of the Mott transition. We show that scattering by fluctuating local moments causes a fully incoherent regime of electron transport with T-linear resistivity. This strange metal regime is characterized by almost universal, nearly Planckian slope and a finite zero-temperature intercept, that we can associate respectively with the amplitude fluctuations and with the random orientations of local magnetic moments. Our results indicate a route for understanding the microscopic origin of strange metal behavior that is unrelated to quantum criticality and does not rely on the existence of quasiparticles.