Optical properties of Nb-doped SrTiO3 single crystal

• Published in: Physica. C, Superconductivity Vol. 463-465; pp. 107 - 110
• Main Authors: Ma, J.Y., Bi, C.Z., Fang, X., Zhao, H.Y., Kamran, M., Qiu, X.G.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.10.2007; Elsevier Science
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Insulators; Optical properties; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of specific thin films; Phonon; Physics; SrTiO3; SrTiO3; 78.20.−e; 78.30.−j; Optical properties; Phonon; Drude model; 78.30.-j; 78.20.-e; Small polaron; Far infrared spectrum; Monocrystals; Reflection spectrum; Temperature effects; Phonon mode; Strontium titanates; Niobium additions; Polarons; Optical properties; Phonon; SrTiO3
• ISSN: 0921-4534; 1873-2143
• DOI: 10.1016/j.physc.2007.05.014

Far-infrared reflectivity spectra of (100) SrTi1−xNbxO3 single crystal have been measured under different temperatures in the frequency region between 100 and 6000cm−1. The obtained spectra are analyzed based on the double damping extended Drude model. Extra absorption near the highest frequency longitudinal phonon mode shows that the polaron coupling must be taken into account. The splitting of the last high reflectivity band, the temperature dependence of the 615cm−1 structure and the appearance of a new weak peak-like defect mode provide some evidence for the existence of small polarons.