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1s2p Resonant Inelastic X-ray Scattering Magnetic Circular Dichroism as a probe for the local and non-local orbitals in CrO 2

Abstract : We have determined the magnetic ground state of the half-metal CrO 2 based on 1s2p Resonant Inelastic X-ray Scattering Magnetic Circular Dichroism (RIXS-MCD) experiments. The two-dimensional RIXS-MCD map displays the 1s X-ray absorption spectrum combined with the 1s2p X-ray emission decay, where there is a large MCD contrast in the final state involving the 2p core hole. Our measurements show that the Cr K pre-edge structure is dominated by dipolar contributions and the quadrupole peak is invisible in direct K pre-edge absorption. Using RIXS-MCD, we reveal that the quadrupole 1s3d pre-edge has a large MCD contrast, which appears at lower energy with respect to the K pre-edge maximum. We use crystal field multiplet calculations to model the excitonic RIXS-MCD spectral shape in tetragonal (D 4h) symmetry. The RIXS-MCD is strongly sensitive to the ground state distortion of the Cr 4+ sites. The calculations of the RIXS-MCD maps suggest that the 3d spin–orbit interaction is fully quenched (3d = 0 meV) and the ground state electron configuration must contain a 3 B 2g (D 4h) contribution, which is required to explain the appearance of the Magnetic Circular Dichroism (MCD) in the Cr K pre-edge. This is in apparent contrast with the compressed tetragonal distortion.
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Patric Zimmermann, Nadejda Bouldi, Myrtille O.J.Y. Hunault, Marcin Sikora, James Ablett, et al.. 1s2p Resonant Inelastic X-ray Scattering Magnetic Circular Dichroism as a probe for the local and non-local orbitals in CrO 2. Journal of Electron Spectroscopy and Related Phenomena, Elsevier, 2018, 222, pp.74 - 87. ⟨10.1016/j.elspec.2017.08.004⟩. ⟨hal-01708748⟩

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