Flexoelectricity in antiferroelectrics
Vales Castro, Pablo (Institut Català de Nanociència i Nanotecnologia)
Roleder, Krystian (University of Silesia in Katowice. Institute of Physics)
Zhao, Lei (Tsinghua University)
Li, Jing-Feng (Tsinghua University)
Kajewski, Dariusz (University of Silesia in Katowice. Institute of Physics)
Catalan, Gustau (Institut Català de Nanociència i Nanotecnologia)

Data:	2018
Resum:	Flexoelectricity (coupling between polarization and strain gradients) is a property of all dielectric materials that has been theoretically known for decades, but only relatively recently it has begun to attract experimental attention. As a consequence, there are still entire families of materials whose flexoelectric performance is unknown. Such is the case of antiferroelectrics: materials with an antiparallel but switchable arrangement of dipoles. These materials are expected to be flexoelectrically relevant because it has been hypothesised that flexoelectricity could be linked to the origin of their antiferroelectricity. In this work, we have measured the flexoelectricity of two different antiferroelectrics (PbZrO and AgNbO) as a function of temperature, up to and beyond their Curie temperature. Although their flexocoupling shows a sharp peak at the antiferroelectric phase transition, neither flexoelectricity nor the flexocoupling coefficients are anomalously high, suggesting that it is unlikely that flexoelectricity causes antiferroelectricity.
Ajuts:	Ministerio de Economía y Competitividad SEV-2013-0295 Ministerio de Economía y Competitividad MAT2016-77100-C2-1-P European Commission 308023 Ministerio de Economía y Competitividad BES-2016-077392
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Antiferroelectric phase transition ; Antiferroelectrics ; Flexoelectric ; Flexoelectricity ; Polarization and strains ; Switchable
Publicat a:	Applied physics letters, Vol. 113, Issue 13 (September 2018) , art. 132903, ISSN 1077-3118

DOI: 10.1063/1.5044724

Postprint 17 p, 1.1 MB

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