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Low-Symmetry Phases in Ferroelectric Nanowires

Abstract : Ferroelectric nanostructures have recently attracted much attention due to the quest of miniaturizing devices and discovering novel phenomena. In particular, studies conducted on two-dimensional and zero-dimensional ferroelectrics have revealed original properties and their dependences on mechanical and electrical boundary conditions. Meanwhile, researches aimed at discovering and understanding properties of one-dimensional ferroelectric nanostruccures are scarce. The determination of the structural phase and of the direction of the polarization in one-dimensional ferroelectrics is of technological importance, since, e.g., a low-symmetry phase in which the polarization lies away from a highly symmetric direction typically generates phenomenal dielectric and electromechanical responses. Here, we investigate the phase transition sequence of nanowires made of KNbO3 and BaTiO3 perovskites, by combining X-ray diffraction, Raman spectroscopy, and first-principles-based calculations. We provide evidence of a previously unreported ferroelectric ground state of monoclinic symmetry and the tuning of the polarization's direction by varying factors inherent to the nanoscale.
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https://hal.archives-ouvertes.fr/hal-00583362
Contributor : Christine Vinée-Jacquin Connect in order to contact the contributor
Submitted on : Tuesday, April 5, 2011 - 2:59:16 PM
Last modification on : Wednesday, December 8, 2021 - 3:01:55 AM

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Laurence Louis, P. Gemeiner, I. Ponomareva, L. Bellaiche, G. Geneste, et al.. Low-Symmetry Phases in Ferroelectric Nanowires. Nano Letters, American Chemical Society, 2010, 10 (4), pp.1177-1183. ⟨10.1021/nl9034708⟩. ⟨hal-00583362⟩

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