Resonant inelastic x-ray scattering operators for t2g orbital systems

Kim, B.; Khaliullin, G.

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Resonant inelastic x-ray scattering operators for t_2g orbital systems

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Kim, B.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Khaliullin, G.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Kim, B., & Khaliullin, G. (2017). Resonant inelastic x-ray scattering operators for t_2g orbital systems. Physical Review B, 96(8): 085108.

Cite as: https://hdl.handle.net/21.11116/0000-000E-D192-0

Abstract

We derive general expressions for resonant inelastic x-ray scattering (RIXS) operators for t(2g) orbital systems, which exhibit a rich array of unconventional magnetism arising from unquenched orbital moments. Within the fast collision approximation, which is valid especially for 4d and 5d transition metal compounds with short core-hole lifetimes, the RIXS operators are expressed in terms of total spin and orbital angular momenta of the constituent ions. We then map these operators onto pseudospins that represent spin-orbit entangled magnetic moments in systems with strong spin-orbit coupling. Applications of our theory to such systems as iridates and ruthenates are discussed, with a particular focus on compounds based on d(4) ions with Van Vleck-type nonmagnetic ground state.