Direct observation of polar tweed in LaAlO(3)

Polar tweed was discovered in mechanically stressed LaAlO(3). 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 el...

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Detalles Bibliográficos
Autores principales: Salje, Ekhard K. H., Alexe, Marin, Kustov, Sergey, Weber, Mads C., Schiemer, Jason, Nataf, Guillaume F., Kreisel, Jens
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4890045/
https://www.ncbi.nlm.nih.gov/pubmed/27250525
http://dx.doi.org/10.1038/srep27193
Descripción
Sumario:Polar tweed was discovered in mechanically stressed LaAlO(3). 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 LaAlO(3). 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 E(g) soft-mode frequency by Raman spectroscopy.

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