On the Origin of the Non-Fermi Liquid Behavior of SrRuO_{3}

Abstract

Motivated by the unusual features observed in the transport properties of the ferromagnetic "bad metal" $SrRuO_{3}$, we construct a model incorporating essential features of the realistic structure of this nearly cubic material. In particular, we show how the $t_{2g}$orbital {\it orientation} in the perfectly cubic structure determines the peculiar structure of the hybridization matrix, and demonstrate how the local non-Fermi liquid features arise when interactions are switched on. we discuss the effect of the slight deviation from the cubic structure (at low-$T$) qualitatively. The model provides a consistent explanation of the features observed recently in the optical response of $SrRuO_{3}$.