Local electronic structure of Fe 2+ impurities in MgO thin films: temperature-dependent soft x-ray absorption spectroscopy study
We report on the local electronic structure of Fe impurities in MgO thin films. Using soft x-ray absorption spectroscopy, we verified that the Fe impurities are all in the 2+ valence state. The fine details in the line shape of the Fe L2,3 edges provide direct evidence for the presence of a dynamica...
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| Hauptverfasser: | , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
23 July 2010
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| In: |
Physical review. B, Condensed matter and materials physics
Year: 2010, Jahrgang: 82, Heft: 3, Pages: 035120 |
| ISSN: | 1550-235X |
| DOI: | 10.1103/PhysRevB.82.035120 |
| Online-Zugang: | Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevB.82.035120 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevB.82.035120 
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| Verfasserangaben: | T. Haupricht, R. Sutarto, M.W. Haverkort, H. Ott, A. Tanaka, H.H. Hsieh, H.-J. Lin, C.T. Chen, Z. Hu, and L.H. Tjeng |
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| 100 | 1 | |a Haupricht, Tim Jakobus Thomas |e VerfasserIn |0 (DE-627)1433941309 |0 (DE-576)363941304 |4 aut | |
| 245 | 1 | 0 | |a Local electronic structure of Fe 2+ impurities in MgO thin films |b temperature-dependent soft x-ray absorption spectroscopy study |c T. Haupricht, R. Sutarto, M.W. Haverkort, H. Ott, A. Tanaka, H.H. Hsieh, H.-J. Lin, C.T. Chen, Z. Hu, and L.H. Tjeng |
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| 520 | |a We report on the local electronic structure of Fe impurities in MgO thin films. Using soft x-ray absorption spectroscopy, we verified that the Fe impurities are all in the 2+ valence state. The fine details in the line shape of the Fe L2,3 edges provide direct evidence for the presence of a dynamical Jahn-Teller distortion. We are able to determine the magnitude of the effective D4h crystal field energies. We also observed a strong temperature dependence in the spectra which we can attribute to the thermal population of low-lying excited states that are present due to the spin-orbit coupling in the Fe 3d. Using this Fe2+ impurity system as an example, we show that an accurate measurement of the orbital moment in Fe3O4 will provide a direct estimate for the effective local low-symmetry crystal fields on the Fe2+ sites, important for the theoretical modeling of the formation of orbital ordering. | ||
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