Počet záznamů: 1

Infrared phonon spectroscopy of a compressively strained (001) SrTiO.sub.3./sub. film grown on a (110) NdGaO.sub.3./sub. substrate

  1. 1.
    0359327 - FZU-D 2012 RIV GB eng J - Článek v odborném periodiku
    Nuzhnyy, Dmitry - Petzelt, Jan - Kamba, Stanislav - Martí, X. - Čechal, T. - Brooks, C. M. - Schlom, D. G.
    Infrared phonon spectroscopy of a compressively strained (001) SrTiO3 film grown on a (110) NdGaO3 substrate.
    Journal of Physics-Condensed Matter. Roč. 23, č. 4 (2011), s. 1-8 ISSN 0953-8984
    Grant CEP: GA ČR GAP204/10/0616; GA ČR(CZ) GA202/09/0682
    Grant ostatní:GAUK(CZ) SVV-2010-261307
    Výzkumný záměr: CEZ:AV0Z10100520
    Klíčová slova: infrared spectroscopy * strontium titanate * neodymium gallate * strained epitaxial film
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 2.546, rok: 2011

    Polarized infrared reflectivity was measured between 5 and 300 K on a 17 nm thick, 1.1% compressively strained epitaxial (001) SrTiO3 film and the orthorhombic (110) NdGaO3 substrate upon which it was grown. A strong in-plane IR anisotropy of the NdGaO3 substrate was observed and polar modes with B1u-and a mixture of B2u + B3u-symmetry were seen. At low temperatures three new modes arose in the 90–130 cm-1 range, which we assigned to 4f Nd electronic transitions. The in-plane SrTiO3 film phonons showed strong stiffening compared to the phonon frequencies of bulk SrTiO3 and the in-plane phonon peaks were found to split. No anomalies were detected as a function of temperature in either the IR response or lattice parameters of the compressively strained SrTiO3 film, providing an absence of evidence for the out-of-plane ferroelectric phase transition predicted by theory.
    Trvalý link: http://hdl.handle.net/11104/0197128