The magnetic exciton of EuS revealed by resonant inelastic x-ray scattering
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| Format: | Preprint |
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2023
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| _version_ | 1866912224736444416 |
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| author | Amidani, Lucia Joos, Jonas J. Glatzel, Pieter Kolorenc, Jindrich |
| author_facet | Amidani, Lucia Joos, Jonas J. Glatzel, Pieter Kolorenc, Jindrich |
| contents | We report the valence-to-core resonant inelastic x-ray scattering (RIXS) of EuS measured at the L3 edge of Eu. The obtained data reveal two sets of excitations: one set is composed of a hole in the S 3p bands and an electron excited to extended Eu 5d band states, the other is made up from a hole in the Eu 4f states and an electron in localized Eu 5d states bound to the 4f hole by its Coulomb potential. The delocalized excitations arise from the dipole-allowed 5d to 2p emissions, whereas the localized excitations result from the dipole-forbidden (quadrupole-allowed) 4f to 2p emissions. Both these emission channels have a comparable intensity thanks to a small number of occupied 5d states (approximately 0.6) combined with a large number of occupied 4f states (seven). We identify the localized electron-hole pairs with the "magnetic excitons" suggested in the past as an interpretation of the sharp features seen in the optical absorption spectra. Our observations provide a direct experimental evidence of these excitons which has been missing up to now. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2310_18096 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | The magnetic exciton of EuS revealed by resonant inelastic x-ray scattering Amidani, Lucia Joos, Jonas J. Glatzel, Pieter Kolorenc, Jindrich Strongly Correlated Electrons Materials Science We report the valence-to-core resonant inelastic x-ray scattering (RIXS) of EuS measured at the L3 edge of Eu. The obtained data reveal two sets of excitations: one set is composed of a hole in the S 3p bands and an electron excited to extended Eu 5d band states, the other is made up from a hole in the Eu 4f states and an electron in localized Eu 5d states bound to the 4f hole by its Coulomb potential. The delocalized excitations arise from the dipole-allowed 5d to 2p emissions, whereas the localized excitations result from the dipole-forbidden (quadrupole-allowed) 4f to 2p emissions. Both these emission channels have a comparable intensity thanks to a small number of occupied 5d states (approximately 0.6) combined with a large number of occupied 4f states (seven). We identify the localized electron-hole pairs with the "magnetic excitons" suggested in the past as an interpretation of the sharp features seen in the optical absorption spectra. Our observations provide a direct experimental evidence of these excitons which has been missing up to now. |
| title | The magnetic exciton of EuS revealed by resonant inelastic x-ray scattering |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2310.18096 |