Dresden 2026 – scientific programme
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FM: Fachverband Funktionsmaterialien
FM 18: German-French Focus Session: (Anti)ferroic states – ferroelectrics, ferroelastics and antiferroelectrics II
FM 18.8: Talk
Thursday, March 12, 2026, 12:30–12:45, BEY/0138
Hybrid antiferroelectric-ferroelectric-ferroelastic domain walls in noncollinear antipolar oxides — •Ivan N. Ushakov1, Mats Topstad1, Muhammad Z. Khalid1, Niyorjyoti Sharma2, Christoph Grams3, Ursula Ludacka1, Jiali He1, Kasper Hunnestad1, Mohsen Sadeqi-Moqadam1, Julia Glaum1, Sverre M. Selbach1, Joachim Hemberger3, Petra Becker3, Ladislav Bohatý3, Amit Kumar2, Jorge Íñiguez-González4,5, Antonius T.J. van Helvoort1, and Dennis Meier1,6 — 1NTNU, Trondheim — 2QUB, Belfast — 3University of Cologne — 4LIST, Luxembourg — 5University of Luxembourg — 6University of Duisburg-Essen
Antiferroelectrics are emerging as advanced functional materials and are fertile ground for unusual electric effects. Here, we demonstrate how antiferroelectricity induces noncollinearity in dipolar order and establish it as an additional degree of freedom, unlocking physical nanoscale properties that are symmetry-forbidden in classical antiferroelectrics. We show that antiferroelectrically driven noncollinear order of electric dipole moments in K3[Nb3O6|(BO3)2] leads to a coexistence of antiferroelectric and ferroelectric behaviors. Besides the double-hysteresis loop observed in antiferroelectrics, a pronounced piezoresponse and electrically switchable hybrid domains are observed, forming atomically sharp and micrometer long charged domain walls with inseparably entangled antiferroelectric and ferroelectric properties. Hybrid antiferroelectric-ferroelectric responses are expected in a wide range of noncollinear systems, giving a new dimension to the research on antiferroelectrics and multifunctional oxides in general.