Transport properties of Metallic Ruthenates: a DFT+DMFT investigation

TL;DR

This study uses DFT+DMFT to investigate the transport properties of Ruthenates, revealing electron-electron scattering dominance and the resilient quasiparticle behavior in these Hund's metals.

Contribution

It provides a systematic theoretical analysis of Ruthenates' transport properties using combined DFT and DMFT, highlighting the role of electron correlations and quasiparticles.

Findings

Good agreement between theory and experiment for optical conductivity and resistivity.

Transport properties are dominated by electron-electron scattering.

Sr$_2$RuO$_4$ exhibits weaker correlations and better metallicity.

Abstract

We present a systematical theoretical study on the transport properties of an archetypal family of Hund's metals, Sr$_2$RuO$_4$,Sr$_3$Ru$_2$O$_7$, SrRuO$_3$ and CaRuO$_3$, within the combination of first principles density functional theory and dynamical mean field theory. The agreement between theory and experiments for optical conductivity and resistivity is good, which indicates that electron-electron scattering dominates the transport of ruthenates. We demonstrate that in the single-site dynamical mean field approach the transport properties of Hund's metals fall into the scenario of "resilient quasiparticles". We explains why the single layered compound Sr$_2$RuO$_4$ has a relative weak correlation with respect to its siblings, which corroborates its good metallicity.