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Forbidden Reflections in TeO2 in the Vicinity of the Te L1 Absorption Edge

1
Physics Department of Moscow State University, 119899 Moscow, Russia
2
Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
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Institute of Experimental Physics, TU Bergakademie Akademiestraße 6, 09599 Freiberg, Germany
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A.V. Shubnikov Institute of Crystallography, FSRC “Crystallography and Photonics” RAS, Leninskiy Prospekt, 59, 119333 Moscow, Russia
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National Reseach Center “Kurchatov Institute”, Ploshchad’ Akademika Kurchatova, 1, 123098 Moscow, Russia
*
Author to whom correspondence should be addressed.
Crystals 2020, 10(9), 719; https://doi.org/10.3390/cryst10090719
Received: 8 July 2020 / Revised: 3 August 2020 / Accepted: 8 August 2020 / Published: 19 August 2020
Examining forbidden reflections provides valuable information on electronic states and the local environment of resonant atoms in crystals. Experimental studies of two forbidden reflections 002 and 100 in TeO2 single crystals were performed at photon energies close to the L1 tellurium absorption edge. It was found that the spectral form corresponding to these two reflections looks almost identical, which is completely unexpected for a highly anisotropic material. Theoretical consideration shows that only one component fxy of the tensor describing dipole-dipole resonance scattering contributes to the 002 reflection, while two components fxy and fxz correspond to the 100 reflection. Numerical calculations show that the latter tensor component is comparable to the first one, but the combination of several geometric factors leads to the fact that its contribution to the spectrum is negligible. This explains the experimentally observed results. The finding shows a way for targeted investigation of single tensor components and makes it possible to compare different spectra and use them the study the physical phenomena in functional materials. View Full-Text
Keywords: X-ray resonant diffraction; forbidden reflections; X-ray spectroscopy X-ray resonant diffraction; forbidden reflections; X-ray spectroscopy
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Ovchinnikova, E.; Novikov, D.; Zschornak, M.; Kulikov, A.; Kozlovskaya, K.; Dmitrienko, V.; Oreshko, A.; Blagov, A.; Mukhamedzhanov, E.; Marchenkov, N.; Borisov, M.; Khadiev, A.; Petrenko, A.; Pisarevsky, Y. Forbidden Reflections in TeO2 in the Vicinity of the Te L1 Absorption Edge. Crystals 2020, 10, 719.

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