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We investigated optical spectra of quasi-two-dimensional multi-band Ca$%_{2-x} $Sr$_{x}$RuO$_{4}$ systems. The extended Drude model analysis on theab-plane optical conductivity spectra indicates that the effective mass shouldbe enhanced near $x=0.5$. Based on the sum rule argument, we showed that theorbital-selective Mott-gap opening for the $d_{yz/zx}$ bands, the widelyinvestigated picture, could not be the origin of the mass enhancement. Weexploited the multi-band effects in the extended Drude model analysis, anddemonstrated that the intriguing heavy mass state near $x=0.5$ should come fromthe renormalization of the $d_{xy}$ band.Comment: 4 figure

physical review letters

Orbital-Selective Mass Enhancements in Multiband<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Ca</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>RuO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>Systems Analyzed by the Extended Drude Model

Orbital-Selective Mass Enhancements in MultibandCa2−xSrxRuO4Systems Analyzed by the Extended Drude Model