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Infrared phonon spectroscopy of a compressively strained (001) SrTiO.sub.3./sub. film grown on a (110) NdGaO.sub.3./sub. substrate
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SYSNO ASEP 0359327 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Infrared phonon spectroscopy of a compressively strained (001) SrTiO3 film grown on a (110) NdGaO3 substrate Author(s) Nuzhnyy, Dmitry (FZU-D) RID, ORCID
Petzelt, Jan (FZU-D) RID, ORCID, SAI
Kamba, Stanislav (FZU-D) RID, ORCID, SAI
Martí, X. (CZ)
Čechal, T. (CZ)
Brooks, C. M. (US)
Schlom, D. G. (US)Source Title Journal of Physics-Condensed Matter. - : Institute of Physics Publishing - ISSN 0953-8984
Roč. 23, č. 4 (2011), s. 1-8Number of pages 8 s. Language eng - English Country GB - United Kingdom Keywords infrared spectroscopy ; strontium titanate ; neodymium gallate ; strained epitaxial film Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects GAP204/10/0616 GA ČR - Czech Science Foundation (CSF) GA202/09/0682 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z10100520 - FZU-D (2005-2011) UT WOS 000286142800022 DOI 10.1088/0953-8984/23/4/045901 Annotation 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. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2012
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