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Evolution of defect signatures at ferroelectric domain walls in Mg‐doped LiNbO3 |
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| Authors: | Guillaume F Nataf Mael Guennou Alexander Haußmann Nick Barrett Jens Kreisel |
| Institution: | 1. Materials, Research and Technology Department, Luxembourg Institute of Science and Technology, Belvaux, Luxembourg;2. Service de Physique de l'Etat Condensé, Gif sur Yvette cedex, France;3. Phone: +352 470 261 512;4. Institut für Angewandte Photophysik, Technische Universit?t Dresden, Dresden, Germany;5. Physics and Materials Science Research Unit, University of Luxembourg, Belvaux, 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. (© 2016 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim) |
| Keywords: | Raman spectroscopy domain walls lithium niobate doping magnesium defects single crystals |