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| VOLUME 120 (2024) | ISSUE 12 | PAGE 943 |
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Soft mode behavior in transition metal doped SrTiO3 thin films on MgO substrates
A. V. Melenteva, E. S. Zhukovaa, B. M. Nekrasova, V. S. Stolyarova,b,c, A. S. Frolova, M. Savinovd, A. A. Bushe, V. I. Kozlove,f, B. P. Gorshunova, M. V. Talanova
aMoscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia bDukhov Research Institute of Automatics (VNIIA), 127055 Moscow, Russia cNational University of Science and Technology MISIS, 119049 Moscow, Russia dInstitute of Physics of the Czech Academy of Sciences, 18221 Prague, Czech Republic eResearch Institute of Solid-State Electronics Materials, MIREA - Russian Technological University (RTU MIREA), 119454 Moscow, Russia fKapitza Institute for Physical Problems of the Russian Academy of Sciences, 119334 Moscow, Russia
Abstract
The ferroelectric soft mode in polycrystalline pristine SrTiO3 and weakly doped SrTiO3:M (M = 2 at 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 SrTiO3. Large negative values of Curie temperature and enhanced positive values of Barrett quantum temperatures are discovered indicating that doped SrTiO3 thin films are farther from ferroelectric phase transition than SrTiO3 crystals. |