Soft Mode Behavior in Transition Metal Doped SrTiO3 Thin Films on MgO Substrates

The ferroelectric soft mode in polycrystalline pristine SrTiO 3 and weakly doped SrTiO 3 :M (M = 2 at % Fe, Ni, Mn, Co) thin films on (001) MgO substrates has been studied using time-domain terahertz spectroscopy. Spectra of real and imaginary parts of film permittivity were determined in the frequency range of 5–100 cm –1 at temperatures between 5 and 300 K. Central frequency and dielectric contribution of the ferroelectric soft mode show Barrett-like temperature dependencies similar to crystalline SrTiO 3 . Large negative values of Curie temperature and enhanced positive values of Barrett quantum temperatures are discovered indicating that doped SrTiO 3 thin films are farther from ferroelectric phase transition than SrTiO 3 crystals.

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Publication Details

Journal
Journal of Experimental and Theoretical Physics Letters
Published
2024-12-01
DOI
https://doi.org/10.1134/s0021364024604561
Primary Topic
Ferroelectric and Piezoelectric Materials
Type
article
Field-Weighted Citation Impact
0.00

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article

Soft Mode Behavior in Transition Metal Doped SrTiO3 Thin Films on MgO Substrates

B. M. Nekrasov, Alexander Melentev, А. С. Фролов, А. А. Буш et al.
Journal of Experimental and Theoretical Physics Letters
Ferroelectric and Piezoelectric Materials
article

Soft Mode Behavior in Transition Metal Doped SrTiO3 Thin Films on MgO Substrates

B. M. Nekrasov, Alexander Melentev, А. С. Фролов, А. А. Буш, E. S. Zhukova, B. P. Gorshunov, V. S. Stolyarov, В. И. Козлов, M. Savinov, М. В. Таланов
article en

Abstract

The ferroelectric soft mode in polycrystalline pristine SrTiO 3 and weakly doped SrTiO 3 :M (M = 2 at % Fe, Ni, Mn, Co) thin films on (001) MgO substrates has been studied using time-domain terahertz spectroscopy. Spectra of real and imaginary parts of film permittivity were determined in the frequency range of 5–100 cm –1 at temperatures between 5 and 300 K. Central frequency and dielectric contribution of the ferroelectric soft mode show Barrett-like temperature dependencies similar to crystalline SrTiO 3 . Large negative values of Curie temperature and enhanced positive values of Barrett quantum temperatures are discovered indicating that doped SrTiO 3 thin films are farther from ferroelectric phase transition than SrTiO 3 crystals.

Journal of Experimental and Theoretical Physics LettersVol. 120(12)
National University of Science and Technology (RU), Moscow Institute of Physics and Technology (RU), Czech Academy of Sciences (CZ), All Russia Research Institute of Automatics (RU), FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ), MIREA - Russian Technological University (RU), P.L. Kapitza Institute for Physical Problems (RU)
Russian Science Foundation, Ministry of Science and Higher Education of the Russian Federation
Openalex Percentile: Top 85%
Ferroelectric and Piezoelectric Materials
DOIOpen Access PDFOpenAlex
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Soft Mode Behavior in Transition Metal Doped SrTiO3 Thin Films on MgO Substrates — B. M. Nekrasov, Alexander Melentev, et al. · Journal of Experimental and Theoretical Physics Letters (2024) | TGRS Research Map | TGRS