# Resonant Inelastic X-ray Scattering on high Tc cuprates and magnetic iridates

Resonant Inelastic X-ray Scattering (RIXS) provides direct access to elementary charge, spin and orbital excitations in complex oxides. As a technique it has made tremendous progress with the advent high-brilliance synchrotron X-ray sources. From the theoretical perspective the fundamental question is to precisely which low-energy correlation functions RIXS is sensitive. Depending on the experimental RIXS setup, the measured charge dynamics can include charge-transfer, phonon, d-d and orbital excitations [1]. The focus of this talk will be on RIXS as a probe of spin dynamics and superconducting gap of high-Tc cuprates [2-4] and the combined magnetic and orbital modes in strongly spin-orbit coupled iridium-oxides [5-10].
[1] L. J. P. Ament, et al., Rev. Mod. Phys. 83, 705 (2011).
[2] L. Braicovich, et al., Phys. Rev. Lett. 104, 077002 (2010).
[3] M. P. M. Dean, et al., Nature Materials 11, 850 (2012).
[4] P. Marra, et al., Phys. Rev. Lett. 110, 117005 (2013).
[5] L. J. P. Ament, et al., Phys. Rev. B 84, 020403 (2011).
[6] V. M. Katukuri, et al., Phys. Rev. B 85, 220402 (2012).
[7] N. A. Bogdanov, et al., Phys. Rev. B 85, 235147 (2012).
[8] J. Kim, et al., Phys. Rev. Lett. 108, 177003 (2012).
[9] H. Gretarsson, et al., Phys. Rev. Lett. 110, 076402 (2013).
[10] A. Lupascu, et al., Phys. Rev. Lett. 112, 147201 (2014).

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