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Low-Symmetry Monoclinic Ferroelectric Phase Stabilized By Oxygen Octahedra Rotations In Strained Euₓsr₁₋ₓtio₃ Thin Films, Anna N. Morozovska, Yijia Gu, Victoria V. Khist, Maya D. Glinchuk, Long-Qing Chen, For Full List Of Authors, See Publisher's Website.
Low-Symmetry Monoclinic Ferroelectric Phase Stabilized By Oxygen Octahedra Rotations In Strained Euₓsr₁₋ₓtio₃ Thin Films, Anna N. Morozovska, Yijia Gu, Victoria V. Khist, Maya D. Glinchuk, Long-Qing Chen, For Full List Of Authors, See Publisher's Website.
Materials Science and Engineering Faculty Research & Creative Works
Using Landau-Ginzburg-Devonshire theory and phase-field modeling, we explore the complex interplay between a structural order parameter (oxygen octahedron rotation) and polarization in EuxSr1-xTiO3 thin films. Under a biaxially tensile strain, a low-symmetry monoclinic phase with in-plane ferroelectric polarization is found to be stabilized by antiferrodistortive oxygen octahedra tilts. The monoclinic phase is stable over a wide temperature range. It is characterized by a large number of energetically equivalent polar and structural twin domains. This work demonstrates the development of a spontaneous polarization and piezo- and pyroelectricity in a ferroelastic twin boundary arising from flexoelectric coupling …
Universal Emergence Of Spatially Modulated Structures Induced By Flexoantiferrodistortive Coupling In Multiferroics, Eugene A. Eliseev, Sergei V. Kalinin, Yijia Gu, Maya D. Glinchuk, Victoria V. Khist, For Full List Of Authors, See Publisher's Website.
Universal Emergence Of Spatially Modulated Structures Induced By Flexoantiferrodistortive Coupling In Multiferroics, Eugene A. Eliseev, Sergei V. Kalinin, Yijia Gu, Maya D. Glinchuk, Victoria V. Khist, For Full List Of Authors, See Publisher's Website.
Materials Science and Engineering Faculty Research & Creative Works
We proved the existence of a universal flexoantiferrodistortive coupling as a necessary complement to the well-known flexoelectric coupling. The coupling is universal for all antiferrodistortive systems and can lead to the formation of incommensurate, spatially modulated phases in multiferroics. Our analysis can provide a self-consistent mesoscopic explanation for a broad range of modulated domain structures observed experimentally in multiferroics.