The optical properties of strontium titanate (SrTiO3) single crystals were determined with spectroscopic ellipsometry in the 1–6 eV spectral region and the 4.2–300 K temperature region.New results regarding features of band edge and near band edge indirect and direct fundamental optical transitions were obtained and updated.It was shown that whereas the indirect transitions lowest in energy shift to higher energies on cooling, the energy of the stronger direct optical transitions in the region of 3.7–4.0 eV shifts to the opposite side, to lower energies , and these transitions can b The full text >>
The possibilities of in situ spectroscopic ellipsometry applied to phase transitions investigation in oxide thin films and crystals are examined in this work, along with the use of various parameters calculated from ellipsometric data (band gap energy Eg, refractive index n and surface roughness) together with the directly measured main ellipsometric angles ψ and Δ, for the detection of phase transitions.
doi: http://dx.doi.org/10.1364/OE.17.014322The full text >>
