Dresden 2026 – wissenschaftliches Programm
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FM: Fachverband Funktionsmaterialien
FM 14: Focus Session: Materials Research in Polar Oxides – From Domain Engineering to Photonic and Electronic Devices II
FM 14.1: Vortrag
Mittwoch, 11. März 2026, 15:00–15:15, BEY/0138
Probing ferroelastic domain properties of lanthanum aluminate via spontaneous Raman scattering — •Robin Buschbeck1, Susanne C. Kehr1, Lukas M. Eng1,2, and Samuel D. Seddon1 — 1TU Dresden, Institute of Applied Physics, Nöthnitzer Strasse 61, 01187 Dresden, Germany — 2ct.qmat: Dresden-Würzburg Cluster of Excellence EXC 2147, TU Dresden, 01062 Dresden, Germany
Lanthanum aluminate (LaAlO3, LAO) is a rhombohedrally distorted oxide perovskite, exhibiting ferroelastic twinning at room temperature. Frequently employed as a thin film substrate [1], it is often overlooked [2] for being optically uniaxial and thus birefringent. The effect of the ferroelastic twins sees an in-plane rotation of this optical axis, with regions of opposing optical axes coexisting (delineated by twin walls).
Here, we present a detailed experimental analysis of LAO(100) using spontaneous Raman scattering (SR). SR is a widely employed technique for obtaining spectral information from a broad range of materials [3]. Using SR, we demonstrate several spatially resolved non-trivial, three-dimensional intrinsic properties of LAO. Special attention is given to the different LAO(100) domains and their behaviour under various SR measurement conditions, including polarization-dependent and spatially resolved in-plane or depth-dependent measurements.
[1] R. W. Simon et al., Springer, Boston, MA (1989)
[2] S. Kustov, et al., Applied Physics Letters 112, 042902 (2018)
[3] A. Orlando et al., Chemosensors 9, 262 (2021)
Keywords: Raman Spectroscopy