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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 3: Focus Session II: Ferroics - Domains and Domain Walls
KFM 3.2: Vortrag
Dienstag, 28. September 2021, 13:45–14:00, H2
Lithium Niobate(LiNbO3) under uniaxial Stress — •Ekta Singh1, Michael Lange1, Sven Reitzig1, Henrik Beccard1, Michael Rüsing1, Clifford Hicks2, and Lukas M. Eng1,3 — 1Institut für Angewandte Physik, Technische Universität Dresden, 01062 Dresden, Germany — 2Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 3ct.qmat: Dresden-Würzburg Cluster of ExcellenceEXC 2147
Ferroelectric properties can be tuned by external fields such as light, dc electric fields, or mechanical strain. Amongst these, strain engineering plays an important role, where a correlation between strain and polarization has been a subject of study in recent years [1, 2]. Conventionally, strain is applied by lattice-mismatched epitaxial growth of thin films on selected substrates, which limits the method to certain materials.
Here, we present a prospective alternative based on piezoelectric actuators that is suitable to apply both compressive and tensile strain to single crystals in a controlled manner, while simultaneously performing dedicated optical or AFM experiments in-situ. To demonstrate the functionality of this device, we present shifts in phonon frequencies with applied strain on stoichiometric Lithium Niobate, measured by Raman spectroscopy. Such control of strain will provide valuable new insights into ferroelectric domain walls and their properties such as electrical conductivity.
[1] V. Stepkova et.al.; J. Phys.: Condens. Matter 24, 212201 (2012) [2] A. Alsubaie et.al.; Nanotechnology 28, 075709 (2017)