Doping and temperature evolutions of optical response of Sr₃(Ir_1-xRu_x)₂O₇.

ABSTRACT: We report on optical spectroscopic study of the Sr₃(Ir_1-xRu_x)₂O₇ system over a wide doping regime. We find that the changes in the electronic structure occur in the limited range of the concentration of Ru ions where the insulator-metal transition occurs. In the insulating regime, the electronic structure associated with the effective total angular momentum J_eff = 1/2 Mott state remains robust against Ru doping, indicating the localization of the doped holes. Upon entering the metallic regime, the Mott gap collapses and the Drude-like peak with strange metallic character appears. The evolution of the electronic structure registered in the optical data can be explained in terms of a percolative insulator-metal transition. The

SUBMITTER: Ahn G 

PROVIDER: S-EPMC7749133 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature