Počet záznamů: 1

Soft-mode spectroscopy of epitaxial BaTiO.sub.3./sub./SrTiO.sub.3./sub. superlattices

  1. 1.
    0353086 - FZU-D 2011 RIV US eng J - Článek v odborném periodiku
    Hlinka, Jiří - Železný, Vladimír - Nakhmanson, S.M. - Soukiassian, A. - Xi, X.X. - Schlom, D. G.
    Soft-mode spectroscopy of epitaxial BaTiO3/SrTiO3 superlattices.
    Physical Review. B. Roč. 82, č. 22 (2010), 224102/1-224102/5 ISSN 1098-0121
    Grant CEP: GA MŠk ME08109; GA ČR GA202/07/0591
    Výzkumný záměr: CEZ:AV0Z10100520
    Klíčová slova: superlattice * perovskites * think films * ferroelecricity * phonon * spectroscopy
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 3.772, rok: 2010

    It is demonstrated that soft modes in 240 nm thick BaTiO3/SrTiO3 ferroelectric superlattices can be probed by infrared reflectivity measurements, which allows us to estimate the intrinsic in-plane dielectric constants of such thin superlattice slabs. Our analysis of the experimental results is combined with the first-principles based theoretical evaluation of optical polar modes in a model system representing the 60-atom periodic superlattice unit cell. This hybrid approach suggests that the observed soft mode is associated with a Slater-type polar mode confined mostly in the SrTiO3 component layer.
    Trvalý link: http://hdl.handle.net/11104/0192428