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Abstract
Using methods of terahertz time-domain spectroscopy dielectric response of ceramic barium hexaferrites substituted with lead (Ba1-xPbxFe12O19, x = 0.00-0.30) was studied in the frequency range of 3-110 cm1 and at temperatures from 5 to 300 K. Obtained spectra are presented by a rich set of lines of different nature, i.e. excitations associated with electronic transitions within the fine-structure components of Fe2+ ions, A2u soft optical phonon, and ferroelectric-like soft mode. The frequency of the soft mode reveals power-law temperature variation vSM ∼ (T-Tc)025 , which indicates a potential phase transition atrc. Analysis shows that Tc approaches zero for the concentrations x = 0.20-0.25.
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Details
1 Laboratory of Terahertz Spectroscopy, Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, Dolgoprudny, Russia
2 Department of Physics, Faculty of Science, Sohag University, Sohag, Egypt
3 Moscow State Technical University of Radio engineering, Electronics and Automation, Moscow, Russia
4 Laboratory of Terahertz Spectroscopy, Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, Dolgoprudny, Russia; Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia