Unoccupied electronic structure of TiOCl studied by x-ray absorption near-edge spectroscopy
We study the unoccupied electronic structure of the spin-1/2 quantum magnet TiOCl by x-ray absorption near-edge spectroscopy (XANES) at the Ti L and O K edges. Data is acquired both in total electron and fluorescence yield mode (TEY and FY, respectively). While only the latter allows to access the u...
Gespeichert in:
| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) Kapitel/Artikel |
| Sprache: | Englisch |
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2011
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| In: |
Arxiv
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| Online-Zugang: | Verlag, kostenfrei, Volltext: http://arxiv.org/abs/1110.5591
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| Verfasserangaben: | S. Glawion, M.W. Haverkort, G. Berner, M. Hoinkis, G. Gavrila, R. Kraus, M. Knupfer, M. Sing, and R. Claessen |
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| 245 | 1 | 0 | |a Unoccupied electronic structure of TiOCl studied by x-ray absorption near-edge spectroscopy |c S. Glawion, M.W. Haverkort, G. Berner, M. Hoinkis, G. Gavrila, R. Kraus, M. Knupfer, M. Sing, and R. Claessen |
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| 520 | |a We study the unoccupied electronic structure of the spin-1/2 quantum magnet TiOCl by x-ray absorption near-edge spectroscopy (XANES) at the Ti L and O K edges. Data is acquired both in total electron and fluorescence yield mode (TEY and FY, respectively). While only the latter allows to access the unconventional low-temperature spin-Peierls (SP) phase of TiOCl the signal is found to suffer from significant self-absorption in this case. Nevertheless, we conclude from FY data that effects of the SP distortion on the electronic structure are absent within experimental accuracy. The similarity of room-temperature FY and TEY data, the latter not being obscured by self-absorption, allows us to use TEY spectra for comparison with simulations. These are performed by cluster calculations in D$_{4h}$ and D$_{2h}$ symmetries using two different codes. We extract values of the crystal-field splitting (CFS) and parametrize our results in often found notations by Slater, Racah and Butler. In all cases, good agreement with published values from other studies is found. | ||
| 650 | 4 | |a Condensed Matter - Strongly Correlated Electrons | |
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