Surface polar states and pyroelectricity in ferroelastics induced by flexo-roto field

A. N. Morozovska, E. A. Eliseev, S. V. Kalinin, Long Qing Chen, Venkatraman Gopalan

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Theoretical analysis based on the Landau-Ginzburg-Devonshire theory is used to show that the joint action of flexoelectric effect and rotostriction leads to a large spontaneous in-plane polarization (∼1-5 C/cm 2) and pyroelectric coefficient (∼10 -3 C/m 2K) in the vicinity of surfaces of otherwise non-ferroelectric ferroelastics, such as SrTiO 3, with static octahedral rotations. The origin of the improper polarization and pyroelectricity is an electric field we name flexo-roto field whose strength is proportional to the convolution of the flexoelectric and rotostriction tensors with octahedral tilts and their gradients. Flexo-roto field should exist at surfaces and interfaces in all structures with static octahedral rotations, and thus, it can induce surface polar states and pyroelectricity in a large class of otherwise nonpolar materials.

Original languageEnglish (US)
Article number142902
JournalApplied Physics Letters
Issue number14
StatePublished - Apr 2 2012

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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