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Exploring Magnetism in Doped Iridates with Resonant X-rays

The physics of 5d transition metal oxides has recently sparked significant interest due to the potential for exotic electronic and magnetic ground states driven by strong spin-orbit coupling effects.  One of the most striking examples of such phenomena is provided by Sr 2 IrO 4 , a layered perovskite iridate which has been proposed as the first experimental realization of a J eff = 1/2 spin-orbital Mott insulator.  Strong similarities between Sr 2 IrO 4 and La 2 CuO 4 , the parent compound of the high-T c cuprates, have led to predictions that unconventional superconductivity may be induced in this system via chemical doping.  In this talk, I will describe how modern synchrotron techniques – such as resonant magnetic x-ray scattering (RMXS), resonant inelastic x-ray scattering (RIXS), and x-ray absorption spectroscopy (XAS) – can be used to investigate the properties of doped iridates such as Sr 2 Ir 1-x Rh x O 4 .  In particular, I will show that Sr 2 Ir 1-x Rh x O 4 represents a unique model system for the study of hole-doped/diluted magnetism in a strongly spin-orbit coupled material, and identify several important distinctions between the physics of doped iridates and doped cuprates.