Infrared spectroscopy of strained BaTiO^sub 3^/SrTiO^sub 3^ superlattices on scandate substrates

Polarized infrared reflectance of ferroelectric [(BaTiO)/(SrTiO)] superlattices grown on DyScO, TbScO, EuScO and SmScOsubstrates by reactive molecular beam epitaxy was measured. Infrared spectra (30-3000 cm) were taken independently from the (110) cut of bare substrate and the substrate covered with...

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Published inPhase transitions Vol. 87; no. 10-11; p. 929
Main Authors Zelezny, Vladimír, Soukiassian, Arsen, Xi, Xiaoxing, Schlom, Darrell G
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis Ltd 01.10.2014
Subjects
Ferroelectrics
Infrared radiation
Molecular beam epitaxy
Spectrum analysis
Strain
Substrates
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Summary:Polarized infrared reflectance of ferroelectric [(BaTiO)/(SrTiO)] superlattices grown on DyScO, TbScO, EuScO and SmScOsubstrates by reactive molecular beam epitaxy was measured. Infrared spectra (30-3000 cm) were taken independently from the (110) cut of bare substrate and the substrate covered with superlattice in two polarizations: along the -axis and perpendicular to it. The phonon parameters and dielectric function of the superlattice were extracted using a fitting procedure to study the influence of the strain induced by different substrates. The phonon frequency dependence on the substrate-induced strain was varying from 75 to 95 cm. The superlattice static permittivity was estimated from that data, which varies from 150 to 270 depending on substrate and polarization. The highest permittivity was obtained for the EuScO substrate. (ProQuest: ... denotes formulae/symbols omitted.)
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ISSN:0141-1594
1029-0338