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FM: Fachverband Funktionsmaterialien
FM 18: German-French Focus Session: (Anti)ferroic states – ferroelectrics, ferroelastics and antiferroelectrics II
FM 18.3: Vortrag
Donnerstag, 12. März 2026, 11:15–11:30, BEY/0138
Strain induced ferroelastic twin-domain dynamics in lanthanum aluminate — •Matthias Roeper1, Robin Buschbeck1, Jakob Wetzel1, Lukas M. Eng1,2, and Samuel D. Seddon1 — 1Institute of Applied Physics, TU Dresden, Nöthnitzer Strasse 61, 01187 Dresden, Germany — 2ct.qmat: Dresden-Würzburg Cluster of Excellence - EXC 2147, TU Dresden, 01062 Dresden, Germany
Over the last decades scientific attention of the oxide perovskite lanthanum aluminate (LaAlO3) has turned (due to the absence of ferroelectric contributions) from originally only an active interfacial substrate material into a model system of ferroelastic twin domain walls. Our new results explore ferroelastic twin-domain dynamics induced by the controlled application of uniaxial strain in single crystalline samples. The domains are spacially resolved by Atomic Force Microscopy and µ-Raman Spectroscopy as a function of applied strain, as well as structural analysis by X-ray diffraction. All experimental investigations are complemented by density functional perturbation theory calculations.
Keywords: ferroelasticity; uniaxial applied strain; LaAlO3; Atomic Force Microscopy