We have used a combination of resonant magnetic x-ray scattering and x-ray absorption spectroscopy to investigate the properties of the doped spin-orbital Mott insulator Sr2Ir1−xRhxO4 (0.07 ≤ x ≤ 0.70). We show that Sr2Ir1−xRhxO4 represents a unique model system for the study of dilute magnetism in the presence of strong spin-orbit coupling, and provide evidence of a doping-induced change in magnetic structure and a suppression of magnetic order at xc ∼ 0.17. We demonstrate that Rh-doping introduces Rh3+/Ir5+ ions which effectively hole-dope this material. We propose that the magnetic phase diagram for this material can be understood in terms of a novel spin-orbital percolation picture.
Digital Object Identifier (DOI)
Clancy, J. P.; Lupascu, A.; Gretarsson, H.; Islam, Z.; Hu, Y. F.; Casa, D.; Nelson, C. S.; LaMarra, S. C.; Cao, Gang; and Kim, Young-June, "Dilute magnetism and spin-orbital percolation effects in Sr2Ir1−xRhxO4" (2014). Physics and Astronomy Faculty Publications. 2.