Orbital-selective Mass Enhancements in Multi-band Ca${}_{2-x}$Sr${}_x$RuO${}_4$ Systems Analyzed by the Extended Drude Model

Abstract

We investigated optical spectra of quasi-two-dimensional multi-band CaSr${}_x$RuO${}_4$ systems. The extended Drude model analysis on the ab-plane optical conductivity spectra indicates that the effective mass should be enhanced near $x=0.5$. Based on the sum rule argument, we showed that the orbital-selective Mott-gap opening for the $d_{yz/zx}$ bands, the widely investigated picture, could not be the origin of the mass enhancement. We exploited the multi-band effects in the extended Drude model analysis, and demonstrated that the intriguing heavy mass state near $x=0.5$ should come from the renormalization of the $d_{xy}$ band.

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References in corpus (3)

• Polarization Relaxation Induced by Depolarization Field in Ultrathin Ferroelectric BaTiO${}_3$ Capacitors
• Orbital-selective Mott transitions in the degenerate Hubbard model
• Mechanism of hopping transport in disordered Mott insulators

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