Open AccessTemperature-dependent far-infrared reflectance of an epitaxial (BaTiO3)8/(SrTiO3)4 superlattice
Author(s) -
V. Železný,
Ondřej Caha,
A. Soukiassian,
Darrell G. Schlom,
X. X. Xi
Publication year - 2017
Publication title -
physical review. b./physical review. b
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.78
H-Index - 465
eISSN - 2469-9969
pISSN - 2469-9950
DOI - 10.1103/physrevb.95.214110
Subject(s) - superlattice , phonon , materials science , condensed matter physics , infrared , epitaxy , polar , diffraction , dielectric , atmospheric temperature range , far infrared , perovskite (structure) , infrared spectroscopy , reflectivity , strontium titanate , spectral line , optics , crystallography , physics , optoelectronics , chemistry , nanotechnology , layer (electronics) , quantum mechanics , astronomy , meteorology
Infrared reflectance spectra of the polar optic phonons in a[(BaTiO3)(8)/(SrTiO3)(4)](50) superlattice over the temperaturerange 8 to 650 K are reported. The spectra exhibit latticevibration features typical of the perovskite constituents,BaTiO3 and SrTiO3. Using the effective medium approximation formultilayer systems and a fitting procedure, we were able tosuccessfully simulate the infrared reflectivity of thesuperlattice structures and extract the parameters anddielectric functions of the phonons. When applied at varyingtemperatures, this approach provides the parameters of thezone-center polar phonons and their temperature dependence.Comparing these results with x-ray diffraction we identifiedsome anomalies in phonon behavior related to the phasetransitions that the superlattice undergoes.
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