Abstract
Angle-dependent 2p3d resonant inelastic X-ray scattering spectra of a LaCoO3 single crystal and a 55 nm LaCoO3 film on a SrTiO3 substrate are presented. Theoretical calculation shows that, with ∼20 meV resolved Co 2p3d resonant inelastic X-ray scattering (RIXS), the excited states of the isotropic 1A1g(Oh) ground state are split by 3d spin-orbit coupling, which can be distinguished viatheir angular dependence. However, strong self-absorption and saturation effects distort the spectra of the LaCoO3 single crystal and limit the observation of small angular dependence. In contrast, the RIXS on 55 nm LaCoO3 shows less self-absorption effects and preserves the angular dependence of the excited states.
Highlights
Resonant inelastic X-ray scattering (RIXS) is a developing technique that is used to investigate the ground and excited states of transition metals, in particular when combined with the angular degrees of freedom
The 2p3d RIXS results as a function of rotation angle and slice cuts. (a) Experimental results of LaCoO3 single crystal. (b, c) Simulated spectra of 1A1g(Oh) ground state (b) without including and (c) including the saturation and the self-absorption effects
We have presented the angular dependence of 2p3d RIXS analyzed with the scattering cross-section including saturation and self-absorption effects
Summary
Resonant inelastic X-ray scattering (RIXS) is a developing technique that is used to investigate the ground and excited states of transition metals, in particular when combined with the angular degrees of freedom (i.e. angle-dependent measurements). The angular dependence of RIXS has been examined by Michel van Veenendaal using crystal field calculations for L- and M-edges in the case of a single valence hole (or a single electron) (van Veenendaal, 2006) Based on these calculations, one is able to discriminate between different transitions of the d-states via their spin characteristics using certain photon polarizations or experimental geometries for RIXS (van Veenendaal, 2006; Moretti Sala et al, 2011). By including the spin–orbit coupling, exchange field (2Jex) or external magnetic field, the system symmetry is further reduced (van Schooneveld et al, 2012) This implies that RIXS can even have the sensitivity to investigate the fine structure of spin–orbit coupling in multielectron systems. This sensitivity is commonly hampered by geometrical aspects of the experiment
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