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arXiv · 1311.0039

Dilute Magnetism and Spin-Orbital Percolation Effects in Rh-doped Sr2IrO4

J. P. Clancy·A. Lupascu·H. Gretarsson·Z. Islam·Y. F. Hu·D. Casa·C. S. Nelson·S. C. Lamarra·G. Cao·Young-June Kim
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Abstract

We have used a combination of resonant magnetic x-ray scattering (RMXS) and x-ray absorption spectroscopy (XAS) to investigate the properties of the doped spin-orbital Mott insulator Sr2Ir(1-x)Rh(x)O4 (0.07 < x < 0.70). We show that Sr2Ir(1-x)Rh(x)O4 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 x_c ~ 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.

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J. P. Clancy, A. Lupascu, H. Gretarsson, Z. Islam, Y. F. Hu, D. Casa, C. S. Nelson, S. C. Lamarra, G. Cao, Young-June Kim. 2014-02-11. Dilute Magnetism and Spin-Orbital Percolation Effects in Rh-doped Sr2IrO4. https://doi.org/10.1103/physrevb.89.054409

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