Observation of an exotic lattice structure in the transparent KTa1−xNbxO3 perovskite supercrystal
| Autor: | Simona Binetti, Raffaella Soave, Leonardo Lo Presti, Luca Tartara, Jacopo Parravicini, Fabrizio Di Mei, Michele Mauri, Gianbattista Parravicini, Laura Loconte, Aharon J. Agranat, Ludovica Falsi, Eugenio DelRe |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Condensed matter physics Superlattice 02 engineering and technology Dielectric Crystal structure 021001 nanoscience & nanotechnology 01 natural sciences Condensed Matter::Materials Science Distortion 0103 physical sciences Curie temperature Orthorhombic crystal system Symmetry breaking 010306 general physics 0210 nano-technology Perovskite (structure) |
| Zdroj: | Physical Review B. 102 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.102.214110 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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