Resonant Inelastic X-ray Scattering on Spin-Orbit Coupled Insulating Iridates
Luuk J.P. Ament, Giniyat Khaliullin, Jeroen van den Brink
TL;DR
This paper investigates how resonant inelastic X-ray scattering (RIXS) reveals elementary excitations in spin-orbit coupled iridates, showing edge-dependent spectral features and mapping dispersive excitations in Sr2IrO4.
Contribution
It demonstrates the edge-specific behavior of RIXS in iridates and provides detailed insights into the dispersive excitations of spin-orbit doublets in Sr2IrO4.
Findings
RIXS spectral weight vanishes at L2 edge but is strong at L3 edge.
RIXS maps out dispersive excitations of spin-orbit doublets.
Sensitive to local and delocalized electronic transitions.
Abstract
We determine how the elementary excitations of iridium-oxide materials, which are dominated by a strong relativistic spin-orbit coupling, appear in Resonant Inelastic X-ray Scattering (RIXS). Whereas the RIXS spectral weight at the L2 x-ray edge vanishes, we find it to be strong at the L3-edge. Applying this to Sr2IrO4, we observe that RIXS, besides being sensitive to local doublet to quartet transitions, meticulously maps out the strongly dispersive delocalized excitations of the low-lying spin-orbit doublets.
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