Non-generality of the Kadowaki–Woods Ratio in Correlated Oxides

Abstract

An explicit expression for the Kadowaki–Woods ratio in correlated metals is derived by invoking saturation of the (high-frequency) Fermi-liquid scattering rate at the Mott–Ioffe–Regel limit. Significant deviations observed in a number of oxides are quantitatively explained due to variations in carrier density, dimensionality, unit cell volume and the number of individual sheets in the Brillouin zone. A generic re-scaling of the original Kadowaki–Woods plot is also presented.