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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 14: Polar Oxide Crystals and Solid Solutions II
KFM 14.2: Talk
Thursday, March 30, 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 Ratzenberger1, 2, •Michael Rüsing1, and Lukas M. Eng1, 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).