Infrared Spectroscopic Evidences of Strong Electronic Correlations in (Sr1-xLax)3Ir2O7.
We report on infrared spectroscopic studies of the electronic response of the (Sr1-xLax)3Ir2O7 system. Our experiments revealed hallmarks of strong electronic correlations in the evolution of the electronic response across the filling-controlled insulator-metal transition. We observed a collapse of the Jeff = 1/2 Mott gap accompanying the transfer of the spectral weight from the high-energy region to the gap region with electron doping. The intraband conductivity at the metallic side of the transition was found to consist of coherent Drude-like and incoherent responses. The sum rule and the extended Drude model analyses further indicated a large mass enhancement. Our results demonstrate a critical role of the electronic correlations in the charge dynamics of the (Sr1-xLax)3Ir2O7 system.
Department of Physics, Hanyang University, Seoul 04763, Korea.
Gihyeon
G
Ahn
Department of Physics, Hanyang University, Seoul 04763, Korea.
S J
SJ
Song
Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA.|Department of Materials, University of California, Santa Barbara, California 93106, USA.
T
T
Hogan
Department of Materials, University of California, Santa Barbara, California 93106, USA.
S D
SD
Wilson
Department of Physics, Hanyang University, Seoul 04763, Korea.
S J
SJ
Moon