Počet záznamů: 1  

Infrared spectroscopy of an epitaxial BaTiO.sub.3./sub./SrTiO.sub.3./sub. superlattice grown on a (110) SmScO.sub.3./sub. substrate

  1. 1. 0440728 - FZU-D 2015 RIV US eng J - Článek v odborném periodiku
    Železný, Vladimír - Soukiassian, A. - Schlom, D. G. - Xi, X.X.
    Infrared spectroscopy of an epitaxial BaTiO3/SrTiO3 superlattice grown on a (110) SmScO3 substrate.
    Journal of Applied Physics. Roč. 115, č. 18 (2014), "184102-1"-"184102-7" ISSN 0021-8979
    Grant CEP: GA ČR(CZ) GAP204/11/1011
    Institucionální podpora: RVO:68378271
    Klíčová slova: perovskites * superlattices
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 2.183, rok: 2014

    Polarized infrared reflectance spectra of a BaTiO3/SrTiO3 superlattice deposited on the (110) cut of SmScO3 substrate and bare substrate have been studied in the broad temperature range from 10 to 650 K. Strong infrared anisotropy of the SmScO3 substrate was observed and explained as a projection of B 1 u and B 2 u  + B 3 u phonons into the (110) plane. In the polarization parallel to the c-axis below 200 cm−1, an anomaly in the temperature dependence of the spectra was observed. Fitting the superlattice and substrate spectra, the parameters of optical phonons and their temperature dependence were determined. The superlattice phonon frequencies show only classical behavior, it means frequency hardening on cooling. Anisotropy was also found in the superlattice phonon frequencies and their contributions to static permittivity.
    Trvalý link: http://hdl.handle.net/11104/0243839