Open AccessInfrared Spectroscopic Evidences of Strong Electronic Correlations in (Sr1−xLax)3Ir2O7
Author(s) -
Gihyeon Ahn,
S. J. Song,
Tom Hogan,
Stephen D. Wilson,
Sun-Young Moon
Publication year - 2016
Publication title -
scientific reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.24
H-Index - 213
ISSN - 2045-2322
DOI - 10.1038/srep32632
Subject(s) - infrared , condensed matter physics , doping , optical conductivity , mott insulator , metal–insulator transition , effective mass (spring–mass system) , metal , molecular electronic transition , mott transition , strongly correlated material , conductivity , atomic electron transition , band gap , drude model , materials science , electrical resistivity and conductivity , infrared spectroscopy , electronic structure , electron , physics , chemistry , spectral line , hubbard model , optics , superconductivity , quantum mechanics , metallurgy , astronomy
We report on infrared spectroscopic studies of the electronic response of the (Sr 1− x La x ) 3 Ir 2 O 7 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 J eff = 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 (Sr 1− x La x ) 3 Ir 2 O 7 system.