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Untangling Electrostatic and Strain Effects on the Polarization of Ferroelectric Superlattices |
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| Authors: | Ekaterina Khestanova Nico Dix Ignasi Fina Mateusz Scigaj José Manuel Rebled César Magén Sonia Estradé Francesca Peiró Gervasi Herranz Josep Fontcuberta Florencio Sánchez |
| Affiliation: | 1. Institut de Ciència de Materials de Barcelona (ICMAB‐CSIC), Campus UAB, Bellaterra, Spain;2. Dep. de Física, Universitat Autònoma de Barcelona, Campus UAB, Bellaterra, Spain;3. Laboratory of Electron Nanoscopy (LENS‐UB), Institute of Nanoscience and Nanotechnology (In2UB), Electronics Department, University of Barcelona, Barcelona, Catalonia, Spain;4. Laboratorio de Microscopías Avanzadas (LMA), Instituto de Nanociencia de Aragón (INA) – ARAID, and Departamento de Física de la Materia Condensada, Universidad de Zaragoza, Zaragoza, Spain |
| Abstract: | The polarization of ferroelectric superlattices is determined by both electrical boundary conditions at the ferroelectric/paraelectric interfaces and lattice strain. The combined influence of both factors offers new opportunities to tune ferroelectricity. However, the experimental investigation of their individual impact has been elusive because of their complex interplay. Here, a simple growth strategy has permitted to disentangle both contributions by an independent control of strain in symmetric superlattices. It is found that fully strained short‐period superlattices display a large polarization whereas a pronounced reduction is observed for longer multilayer periods. This observation indicates that the electrostatic boundary mainly governs the ferroelectric properties of the multilayers whereas the effects of strain are relatively minor. |
| Keywords: | BaTiO3 epitaxy ferroelectric superlattices oxides thin films |