Dielectric response of (Ba,Sr)TiO3 thin films in a terahertz and IR ranges |
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Authors: | G A Komandin V M Mukhortov O E Porodinkov I E Spektor |
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Institution: | 1. Prokhorov General Physics Institute, Russian Academy of Sciences, ul. Vavilova 38, Moscow, 119991, Russia 2. Southern Scientific Center of the Russian Academy of Sciences, ul. Chekhova 41, Rostov-on-Don, 344006, Russia
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Abstract: | Dependences of the dielectric response spectra on the thickness of the films based on the (Ba,Sr)TiO3 (BST) solid solutions, which were deposited on single-crystal MgO substrates, have been analyzed. Using the Lorentz and Lyddane-Sachs-Teller models, the mutual correspondence of longitudinal optical (LO) and transverse optical (TO) phonon frequencies has established. The giant LO-TO splitting of the lowest-frequency vibration and inversion of LO and TO frequencies of other phonons in the IR spectrum of BST films has been found for the first time. |
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