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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.

Temperature-dependent far-infrared reflectance of an epitaxial (BaTiO3)8/(SrTiO3)4 superlattice