Regensburg 2025 – scientific programme
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 9: (Multi)ferroic States: From Fundamentals to Applications (IV)
KFM 9.3: Talk
Tuesday, March 18, 2025, 12:15–12:30, H9
Hybrid ferroelectric-antiferroelectric domain walls in noncollinear antipolar oxides — •Ivan N. Ushakov1, Mats Topstad1, Muhammad Z. Khalid1, Niyorjyoti Sharma2, Christoph Grams3, Ursula Ludacka1, Jiali He1, Kasper A. Hunnestad1, Mohsen Sadeqi-Moqadam1, Julia Glaum1, Sverre M. Selbach1, Joachim Hemberger3, Petra Becker3, Ladislav Bohaty3, Amit Kumar2, Antonius T. J. van Helvoort1, and Dennis Meier1 — 1Norwegian University of Science and Technology — 2Queen’s University Belfast — 3University of Cologne
Antiferroelectrics are emerging as advanced functional materials and are fertile ground for unusual electric effects. For example, they enhance the recoverable energy density in energy storage applications and give rise to large electromechanical responses. In my talk, I will present noncollinearity in dipolar order as an additional degree of freedom, unlocking physical properties that are symmetry-forbidden in classical antiferroelectrics. I will show that noncollinear order of electric dipole moments in K3[Nb3O6|(BO3)2] leads to a coexistence of ferroelectric and antiferroelectric behaviors. Besides the double-hysteresis loop observed in antiferroelectrics, a pronounced piezoresponse and electrically switchable domains are observed, separated by atomically sharp and micrometer-long charged domain walls. Similar hybrid ferroelectric-antiferroelectric responses are expected in a wide range of noncollinear systems, giving a new dimension to the research on antiferroelectrics and multifunctional oxides in general.