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Dilute magnetism and spin-orbital percolation effects in Sr 2 Ir 1 - X Rh x O 4

Physical Review B - Condensed Matter and Materials Physics, ISSN: 1098-0121, Vol: 89, Issue: 5
2014
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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. © 2014 American Physical Society.

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