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Structural, optical and vibrational properties of self-assembled Pbn+1(Ti1−xFex)nO3n+1−δ Ruddlesden-Popper superstructures
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Doig, K. I., Peters, Jonathan J. P., Nawaz, Seeraz, Walker, David, Walker, Marc, Lees, Martin R., Beanland, R., Sanchez, Ana M., McConville, C. F., Palkar, V. R. and Lloyd-Hughes, James (2015) Structural, optical and vibrational properties of self-assembled Pbn+1(Ti1−xFex)nO3n+1−δ Ruddlesden-Popper superstructures. Scientific Reports, 5 . pp. 1-10. 7719. doi:10.1038/srep07719 ISSN 2045-2322.
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Official URL: http://dx.doi.org/10.1038/srep07719
Abstract
Bulk crystals and thin films of PbTi1−xFexO3−δ (PTFO) are multiferroic, exhibiting ferroelectricity and ferromagnetism at room temperature. Here we report that the Ruddlesden-Popper phase Pbn+1(Ti1−xFex)nO3n+1−δ forms spontaneously during pulsed laser deposition of PTFO on LaAlO3 substrates. High-resolution transmission electron microscopy, x-ray diffraction and x-ray photoemission spectroscopy were utilised to perform a structural and compositional analysis, demonstrating that and . The complex dielectric function of the films was determined from far-infrared to ultraviolet energies using a combination of terahertz time-domain spectroscopy, Fourier transform spectroscopy, and spectroscopic ellipsometry. The simultaneous Raman and infrared activity of phonon modes and the observation of second harmonic generation establishes a non-centrosymmetric point group for Pbn+1(Ti0.5Fe0.5)nO3n+1−δ, a prerequisite for (but not proof of) ferroelectricity. No evidence of macroscopic ferromagnetism was found in SQUID magnetometry. The ultrafast optical response exhibited coherent magnon oscillations compatible with local magnetic order, and additionally was used to study photocarrier cooling on picosecond timescales. An optical gap smaller than that of BiFeO3 and long photocarrier lifetimes may make this system interesting as a ferroelectric photovoltaic.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QD Chemistry | ||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Library of Congress Subject Headings (LCSH): | Ferroelectric crystals -- Properties, Ferroelectric thin films, Photonics | ||||||||
Journal or Publication Title: | Scientific Reports | ||||||||
Publisher: | Nature Publishing Group | ||||||||
ISSN: | 2045-2322 | ||||||||
Official Date: | 16 January 2015 | ||||||||
Dates: |
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Volume: | 5 | ||||||||
Number of Pages: | 10 | ||||||||
Page Range: | pp. 1-10 | ||||||||
Article Number: | 7719 | ||||||||
DOI: | 10.1038/srep07719 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||
Date of first compliant deposit: | 28 January 2016 | ||||||||
Date of first compliant Open Access: | 28 January 2016 | ||||||||
Funder: | Engineering and Physical Sciences Research Council (EPSRC), Advantage West Midlands (AWM), European Regional Development Fund (ERDF) | ||||||||
Grant number: | EP/H003444/2 (EPSRC) | ||||||||
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