We investigated Ru-doped single-crystal iridates, , at three different doping concentrations (, 0.07, and 0.10) using optical spectroscopy. The undoped pristine compound () is known as a novel Mott insulator. Remarkably, the optical conductivity spectra of all three samples exhibited 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 iridates estimated from the Drude components are significantly smaller than the expected values estimated from the nominal Ru-doping concentrations. Herein, we provide the temperature- and doping-dependent electronic structure evolution of Ru-doped iridates. We expect that our results will be useful for understanding the intriguing Ru-doping-dependent properties of iridate .
|Journal||Physical Review B|
|Publication status||Published - 2021 Oct 15|
Bibliographical noteFunding Information:
J.H. acknowledges financial support from the National Research Foundation of Korea (NRF-2017R1A2B4007387 and 2021R1A2C101109811). The work at Yonsei University was supported by the National Research Foundation of Korea [Grants No. NRF-2017R1A5A1014862 (SRC program: vdWMRC center), No. NRF-2019R1A2C2002601, and No. NRF-2021R1A2C1006375].
© 2021 American Physical Society
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics