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Low-temperature nanospectroscopy of the structural ferroelectric phases in single-crystalline barium titanate

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Abstract

We optically investigate the local-scale ferroelectric domain structure of tetragonal, orthorhombic, and rhombohedral barium titanate (BTO) single crystals using scattering-type scanning near-field infrared (IR) optical microscopy (s-SNIM) at temperatures down to 150 K. Thanks to the precisely tunable narrow-band free-electron laser FELBE, we are able to explore the spectral fingerprints and IR resonances of these three phases and their domain orientations in the optical IR near-field. More clearly, every structural phase is analyzed with respect to its near-field resonances close to a wavelength of 17 μm when exploring the (111)-oriented BTO sample surface. Furthermore, near-field imaging at these resonances is performed, that clearly allows for the unambiguous optical identification of different domain orientations. Since our s-SNIM is based on a non-contact scanning force microscope, our s-SNIM findings are backed up by sample-topography and piezoresponse force microscopy (PFM) imaging, providing complementary information in an excellent match to the s-SNIM results.

Graphical abstract: Low-temperature nanospectroscopy of the structural ferroelectric phases in single-crystalline barium titanate

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Publication details

The article was received on 20 May 2018, accepted on 01 Aug 2018 and first published on 16 Aug 2018


Article type: Paper
DOI: 10.1039/C8NR04081H
Citation: Nanoscale, 2018, Advance Article
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    Low-temperature nanospectroscopy of the structural ferroelectric phases in single-crystalline barium titanate

    J. Döring, D. Lang, L. Wehmeier, F. Kuschewski, T. Nörenberg, S. C. Kehr and L. M. Eng, Nanoscale, 2018, Advance Article , DOI: 10.1039/C8NR04081H

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