We investigated Ru-doped single-crystal 5d iridiates, Sr2Ir1−xRuxO4, at three different doping concentrations (x= 0.01, 0.07 and 0.10) using optical spectroscopy. The undoped pristine compound (Sr2IrO4) is known as a novel Jeff = 1/2 Mott insulator. Remarkably, the optical conductivity spectra of all three samples exhibited the insulating behavior, although we observed weak Drude components in the optical conductivity spectra down to the lowest temperature of 30 K. The charge-carrier densities of the Ru-doped iridiates estimated from the Drude components are significantly smaller than the expected values estimated from the nominal Ru-doping concentrations. Herein, we provide temperature- and doping-dependent electronic structure evolution of Ru-doped iridiates. We expect that our results will be useful for understanding the intriguing Ru-doping-dependent properties of 5d iridiate Sr2IrO4.
@article{arxiv.2110.00732,
title = {Evolution of electronic structure of Ru-doped single-crystal iridiates, Sr$_2$Ir$_{1-x}$Ru$_x$O$_4$},
author = {Seokbae Lee and Yu-Seong Seo and Eilho Jung and Seulki Roh and Myounghoon Lee and Hwan Young Choi and Jong Hyuk Kim and Nara Lee and Young Jai Choi and Jungseek Hwang},
journal= {arXiv preprint arXiv:2110.00732},
year = {2021}
}