Far-infrared spectroscopy of a SrTiO<sub>3</sub>thin film

Fedorov, I.; Železn, V.; Petzelt, J.; Трепаков, В. А.; Jelı́nek, M.; Trtik, V.; ňansk, M. Čer; ccaron, V. Studni; Ka,

doi:10.1080/00150199808014890

Cited by 42 publications

(37 citation statements)

References 22 publications

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“…2. BST system including pure BaTiO 3 (BT) [12,20,25], ST [26][27][28][29][30] BST 35/65, 65/35 [27] and 10/90 [20,25,31]; phenomena observed in ST will be discussed here. 3.…”

Section: Resultsmentioning

confidence: 99%

Dielectric Response of Soft Modes in Ferroelectric Thin Films

et al. 2003

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“…2. BST system including pure BaTiO 3 (BT) [12,20,25], ST [26][27][28][29][30] BST 35/65, 65/35 [27] and 10/90 [20,25,31]; phenomena observed in ST will be discussed here. 3.…”

Section: Resultsmentioning

confidence: 99%

Dielectric Response of Soft Modes in Ferroelectric Thin Films

et al. 2003

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“…Other parameters ͑ 0 Ϸ 90 cm −1 , B Ϸ 2.5ϫ 10 6 cm −2 ͒ are in reasonable agreement with their values reported for single crystals. 7,11 To summarize, we have demonstrated the field-induced tunability of the dielectric properties of STO thin films in the MHz and THz frequency ranges. We have shown that the observed modulation is due to the soft mode hardening upon applied electric field.…”

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confidence: 99%

“…A review on tunable ferroelectric materials for microwave devices has been published recently. 6 Strontium titanate ͑STO͒ is an incipient ferroelectric material, which means that, on the one hand, its dielectric behavior is fully controlled by the soft mode dynamics, 7 and on the other hand, it remains paraelectric down to the lowest temperatures due to quantum fluctuations. 8 These properties along with the possibility of preparing high quality thin films make STO a material of choice for applications in tunable microwave components.…”

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confidence: 99%

Dielectric tunability of SrTiO3 thin films in the terahertz range

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Kadlec

Němec

et al. 2006

Applied Physics Letters

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We have developed an interdigited electrode structure for applying a static electric field to a ferroelectric thin film, which enables nearly full transmission of a perpendicularly polarized terahertz wave. This approach has been used to determine the electric field dependence of the complex permittivity of a SrTiO3 thin film on a sapphire substrate up to about 2THz employing time-domain terahertz spectroscopy. We have demonstrated up to 10% variation of the film permittivity at 300GHz at room temperature induced by an applied electric field of 100kV∕cm. No dielectric dispersion is observed between 1MHz and about 500GHz. The field-induced changes are attributed to soft mode hardening.

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“…The observed thickness dependence of the dielectric dispersion may be understood in terms of the defects induced by the strong mismatch of the lattice constant between substrate and SrTiO 3 . The previously reported dielectric dispersions of the SrTiO 3 thin films deposited on SrRuO 3 or Al 2 O 3 substrate is similar to that obtained for 460 and 1046 nm films in this paper [4,5]. In these works, the complex dielectric constant is obtained by the Kramers-Kronig relation or the fitting of the refractivity.…”

Section: Resultsmentioning

confidence: 54%

“…Furthermore, photoinduced giant permittivity is recently observed in SrTiO 3 and attracted a renewed attention to its excited states [3]. However, such large dielectric constant of the bulk SrTiO 3 crystals is known to be reduced in thin films [4,5]. The mechanism is not fully understood, because of the complex contributions of stress from the substrate and thermal expansion mismatch, defects and impurities, surfaces, interfaces and grain boundaries.…”

Section: Introductionmentioning

confidence: 97%