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...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article (Journal) |
| Language: | English |
| Published: |
23 July 2010
|
| In: |
Physical review. B, Condensed matter and materials physics
Year: 2010, Volume: 82, Issue: 3, Pages: 035120 |
| ISSN: | 1550-235X |
| DOI: | 10.1103/PhysRevB.82.035120 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevB.82.035120 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevB.82.035120 
|
| Author Notes: | 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 |
| Summary: | 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. |
|---|---|
| Item Description: | Die Ziffer 2 sowie das +Zeichen im Titel sind hochgestellt Gesehen am 06.11.2017 |
| Physical Description: | Online Resource |
| ISSN: | 1550-235X |
| DOI: | 10.1103/PhysRevB.82.035120 |