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Temperature and electric field tuning of the ferroelectric soft modein a strained SrTiO.sub.3./sub. / DyScO.sub.3./sub. heterostructure

SYSNO ASEP	0343463
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Temperature and electric field tuning of the ferroelectric soft modein a strained SrTiO₃ / DyScO₃ heterostructure
Author(s)	Kadlec, Christelle (FZU-D)_{RID, ORCID} Skoromets, Volodymyr (FZU-D)_RID Kadlec, Filip (FZU-D)_{RID, ORCID, SAI} Němec, Hynek (FZU-D)_{RID, ORCID, SAI} Hlinka, Jiří (FZU-D)_{RID, ORCID} Schubert, J. (DE) Panaitov, G. (DE) Kužel, Petr (FZU-D)_{RID, ORCID, SAI}
Source Title	Physical Review. B - ISSN 1098-0121 Roč. 80, č. 17 (2009), 174116/1-174116/6
Number of pages	6 s.
Language	eng - English
Country	US - United States
Keywords	strontium titanate ; terahertz ; strained films ; ferroelectrics
Subject RIV	BM - Solid Matter Physics ; Magnetism
R&D Projects	IAA100100907 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR)
	LC512 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
CEZ	AV0Z10100520 - FZU-D (2005-2011)
UT WOS	000272310400034
DOI	10.1103/PhysRevB.80.174116
Annotation	We studied THz dielectric spectra of SrTiO3/DyScO3 epitaxial multilayers with four 50-nm-thick layers of each compound deposited on DyScO3 substrate as a function of temperature and electric field. At room temperature, SrTiO3 is in the paraelectric phase and the soft-mode frequency is shifted down to 47 cm-1. The ferroelectric phase transition occurs in the strained SrTiO3 layers around 270 K and in the ferroelectric phase the soft-mode hardening upon temperature decrease is observed. The soft mode is linearly coupled to an excitation of relaxation type at 10 cm-1 at all temperatures. This relaxation is silent in the paraelectric phase, but it becomes coupled to the polarization below the ferroelectric transition temperature. The recently proposed universal model of soft-mode behavior in strained SrTiO3 films [C. Kadlec et al., J. Phys.: Condens. Matter 21, 115902 (2009)] was generalized to describe the observed spectra at all temperatures and applied fields.
Workplace	Institute of Physics
Contact	Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579
Year of Publishing	2011

Number of the records: 1