Direct observation of polar tweed in LaAlO3
| Autor: | Sergey Kustov, Guillaume F. Nataf, Jens Kreisel, Mads C. Weber, Ekhard K. H. Salje, J. A. Schiemer, Marin Alexe |
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| Rok vydání: | 2016 |
| Předmět: |
Multidisciplinary
Materials science Electrical polarity Birefringence Condensed matter physics TK Physics [G04] [Physical chemical mathematical & earth Sciences] 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Piezoelectricity Article symbols.namesake Physique [G04] [Physique chimie mathématiques & sciences de la terre] 0103 physical sciences Microscopy symbols Polar 010306 general physics 0210 nano-technology Spectroscopy Raman spectroscopy Quartz |
| Zdroj: | SCIENTIFIC REPORTS, 6. (2016). Scientific Reports |
| ISSN: | 2045-2322 |
| Popis: | Polar tweed was discovered in mechanically stressed LaAlO3. Local patches of strained material (diameter ca. 5 μm) form interwoven patterns seen in birefringence images, Piezo-Force Microscopy (PFM) and Resonant Piezoelectric Spectroscopy (RPS). PFM and RPS observations prove unequivocally that electrical polarity exists inside the tweed patterns of LaAlO3. The local piezoelectric effect varies greatly within the tweed patterns and reaches magnitudes similar to quartz. The patterns were mapped by the shift of the Eg soft-mode frequency by Raman spectroscopy. |
| Databáze: | OpenAIRE |
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