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Evolution of defect signatures at ferroelectric domain walls in Mg-doped LiNbO3

Guillaume Nataf 1, 2, * Mael Guennou 2 Alexander Hauβmann 3 N Barrett 1 Jens Kreisel 2, 4
* Corresponding author
1 LENSIS - Laboratoire d'Etude des NanoStructures et Imagerie de Surface
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
2 Materials Research and Technology (MRT) Department, Luxembourg Institute of Science and Technology (LIST)
3 Institut für Angewandte Photophysik.
4 Physics and Materials Science Research Unit, University of Luxembourg
Abstract : The domain structure of uniaxial ferroelectric lithium niobate single crystals is investigated using Raman spectroscopy mapping. The influence of doping with magnesium and poling at room temperature is studied by analysing frequency shifts at domain walls and their variations with dopant concentration and annealing conditions. It is shown that defects are stabilized at domain walls and that changes in the defect structures with Mg concentration can be probed by the shift of Raman modes. We show that the signatures of polar defects in the bulk and at the domain walls differ.
Keywords : Raman spectroscopy magnesium single crystals doping lithium niobate domain walls defects
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Submitted on : Monday, October 2, 2017 - 2:08:18 PM
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Guillaume Nataf, Mael Guennou, Alexander Hauβmann, N Barrett, Jens Kreisel. Evolution of defect signatures at ferroelectric domain walls in Mg-doped LiNbO3. physica status solidi (RRL) - Rapid Research Letters, Wiley-VCH Verlag, 2016, 10, pp.222-226. ⟨10.1002/pssr.201510303⟩. ⟨cea-01349607⟩

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