SKM 2023 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 14: Polar Oxide Crystals and Solid Solutions II

KFM 14.2: Vortrag

Donnerstag, 30. März 2023, 14:20–14:40, POT 106

Ferroelectric domains and domain walls under uniaxial stress * A case study in lithium niobate — Ekta Singh¹, Henrik Beccard¹, Michael Lange¹, Sven Reitzig¹, Zeeshan H. Amber¹, Clifford W. Hicks³, Julius Ratzenberger^{1, 2}, •Michael Rüsing¹, and Lukas M. Eng^{1, 2} — ¹Institut für Angewandte Physik, TU Dresden, Nöthnitzer Straße 61, 01187 Dresden, Germany — ²ct.qmat: Dresden-Würzburg Cluster of Excellence - EXC 2147, TU Dresden, 01062 Dresden, Germany — ³School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, United Kingdom

In material science, mechanical strain has an influence on a multitude of material properties. For ferroelectrics, strain can be achieved via standard techniques, such as lattice-mismatched epitaxial growth of thin films, or hydrostatic pressure. However, these methods are either limited to specific material combinations or non-local investigation techniques. Here, we present an alternative approach [1] to study bulk crystals under the influence of uniaxial strain, using a piezo-actuator-based device that is compatible with various local probe techniques. To demonstrate the operation we present the influence of strain on the vibrational properties probed via micro-Raman spectroscopy [1], as well as the influence of strain on the local conductivity of ferroelectric domain walls probed by scanning con-ductance microscopy [2]. [1] E. Singh et.al, arXiv:2210.14120 (2022). [2] E. Singh et.al, Phys. Rev. B 106,144103 (2022).