Soft-mode spectroscopy of epitaxial BaTiO3/ SrTiO3 superlattices

J. Hlinka; V. Zelezny; S. M. NakhmansonA. SoukiassianX. X. XiD. G. Schlom

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Soft-mode spectroscopy of epitaxial BaTiO3/ SrTiO3 superlattices

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It is demonstrated that soft modes in 240 nm think BaTiO_3/SrTiO_3 ferroelectric superlattices can be probed by infrared reflectivity measurements, which allows us to estimate the intrinsic in-plane dielectric constants of such thin superlattice slabs. The infrared reflectance spectrum of the (BaTiO_3)_8/(SrTiO_3)_4superlattice epitaxially grown a DyScO_3 single-crystal substrate reveals a strong polar mode with a transverse optic frequency of about 70 cm~(-1) and moderate damping (about 30 cm~(-1)). Our analysis of the experimental results is combined with the first-principles based theoretical evaluation of optical polar modes in a model system representing the 60-atom periodic superlattice unit cell. This hybrid approach suggests that the observed soft mode is associated with a Slater-type polar mode confined mostly in the SrTiO3 component layer.

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《Physical review, B. Condensed matter and materials physics》 |2010年第22期|224102:1-224102:5|共5页
作者
J. Hlinka; V. Zelezny; S. M. NakhmansonA. SoukiassianX. X. XiD. G. Schlom;
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作者单位

Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague 8, Czech Republic;

Argonne National Laboratory, 9700 S. Cass. Avenue, Argonne, Illinois 60439, USA;

Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802-5005, USA;

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正文语种英语
中图分类物理学;
关键词
spectroscopy; superlattices; frequency;

Soft-mode spectroscopy of epitaxial BaTiO3/ SrTiO3 superlattices

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