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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 11: Focus Session: (Multi-)Ferroic States II
KFM 11.6: Vortrag
Dienstag, 19. März 2024, 11:40–12:00, EMH 225
Investigation of local structure in polar skyrmions using three-dimensional diffuse X-ray scattering — •Joohee Bang1, Nives Strkalj2, Martin Sarott1, Morgan Trassin1, and Thomas Weber1 — 1Department of Materials Science, ETH Zurich — 2Institute of Physics, Zagreb
The discovery of nontrivial polar topologies have attracted great attention as it holds promise for alternative device configurations for microelectronics. Specifically, superlattices consisting of ferroelectric lead titanate and dielectric strontium titanate have shown a number of nontrivial topologies such as polar vortex-antivortex pairs [1] and polar skyrmions [2]. In fact, short-period (of only a few unit cells) superlattices were previously reported to exhibit improper ferroelectricity associated with octahedral tilts [3]. However, the phase and magnitude of octahedral tilts in the system are yet to be fully investigated. Detailed investigation of the local atomic structure and the interlayer correlation of the polarization domains in these nontrivial topological systems also remains elusive. Here, we perform an in-depth analysis of octahedral tilts as well as that of cation displacements in polar skyrmion structures via a comprehensive reciprocal space investigation. The observation of A-cation displacements associated with octahedral tilts as a function of temperature and the investigation of their correlation strength is the primary focus of our work.
[1]Yadav et al., Nature 530, 2016
[2]Das et al., Nature 568, 2019
[3]Bousquet et al., Nature 452, 2008
Keywords: thin films; ferroelectric oxide superlattices; polar skyrmions; diffuse scattering; octahedral tilt