Superdomain structure and high conductivity at the vertices in the (111)-oriented epitaxial tetragonal Pb(Zr,Ti)O3 thin film |
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Authors: | Sang Mo Yang Yeong Jae Shin Yoshitaka Ehara Hiroshi Funakubo Jong-Gul Yoon James F Scott Tae Won Noh |
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Institution: | 1. Department of Physics, Sookmyung Women''s University, Seoul 04310, Republic of Korea;2. Institute of Advanced Materials and Systems, Sookmyung Women''s University, Seoul 04310, Republic of Korea;3. Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea;4. Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea;5. Department of Materials Science and Engineering, Tokyo Institute of Technology, Yokohama 226-8502, Japan;6. Department of Physics, University of Suwon, Hwaseong, Gyunggi-do 18323, Republic of Korea;7. Schools of Chemistry and Physics, University of St. Andrews, St. Andrews, KY16 9ST, United Kingdom |
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Abstract: | Recently, in ferroelectric materials, there have been many experimental efforts to find out more intriguing topological objects and their functionalities, such as conduction property. Here we investigated ferroelectric domain structures and related topological defects in the (111)-oriented epitaxial tetragonal PbZr0.35Ti0.65O3 thin film. Systematic piezoresponse force microscopy measurements revealed that the field-induced polarization switching can form thermodynamically stable superdomain structures composed of nano-sized stripe subdomains. Within such superdomain structures, we observed the exotic equilateral triangular in-plane flux-closure domains composed of three stripe domain bundles with 120/120/120 degrees of separation. The conductive-atomic force microscopy measurements under vacuum showed that some vertices have significantly higher conductivity compared to other surrounding regions. This work highlights electric field-driven polarization switching and unique crystallographic symmetry (here, three-fold rotational symmetry) can generate exotic ferroelectric domain structures and functional topological defects, such as conductive vertices. |
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Keywords: | Corresponding author Department of Physics Sookmyung Women's University Seoul 04310 Republic of Korea Ferroelectric Superdomain Flux-closure domain Vertex Piezoresponse force microscopy Conductive-atomic force microscopy |
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