We perform redundant x-ray diffraction versus temperature experiments in bulk transparent KTN. We find a violation of the standard perovskite cubic-to-tetragonal symmetry breaking at the Curie point in the form of an orthorhombic cell distortion. The lattice distortion spans coherently macroscopic volumes of the sample and is characterized by a negative-to-zero thermal volume expansion. Dielectric measurements and calorimetry indicate that the anomalous behavior is not associated to a distinct thermodynamic phase. The comparison of linear and nonlinear optical scattering experiments with structural data suggests that the lattice distortion is a consequence of strain relaxation to a 3D superlattice of polarization vortices.

Observation of an exotic lattice structure in the transparent KTa1-xNbx O3 perovskite supercrystal / Lo Presti, L.; Parravicini, J.; Soave, R.; Parravicini, G.; Mauri, M.; Loconte, L.; Di Mei, F.; Falsi, L.; Tartara, L.; Binetti, S.; Agranat, A. J.; Delre, E.. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - 102:21(2020). [10.1103/PhysRevB.102.214110]

Observation of an exotic lattice structure in the transparent KTa1-xNbx O3 perovskite supercrystal

Falsi L.;Delre E.
2020

Abstract

We perform redundant x-ray diffraction versus temperature experiments in bulk transparent KTN. We find a violation of the standard perovskite cubic-to-tetragonal symmetry breaking at the Curie point in the form of an orthorhombic cell distortion. The lattice distortion spans coherently macroscopic volumes of the sample and is characterized by a negative-to-zero thermal volume expansion. Dielectric measurements and calorimetry indicate that the anomalous behavior is not associated to a distinct thermodynamic phase. The comparison of linear and nonlinear optical scattering experiments with structural data suggests that the lattice distortion is a consequence of strain relaxation to a 3D superlattice of polarization vortices.
perovskites; ferroelectricity;
01 Pubblicazione su rivista::01a Articolo in rivista
Observation of an exotic lattice structure in the transparent KTa1-xNbx O3 perovskite supercrystal / Lo Presti, L.; Parravicini, J.; Soave, R.; Parravicini, G.; Mauri, M.; Loconte, L.; Di Mei, F.; Falsi, L.; Tartara, L.; Binetti, S.; Agranat, A. J.; Delre, E.. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - 102:21(2020). [10.1103/PhysRevB.102.214110]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1599159
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