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Ahmed, A G; Prokhorov, A S; Anzin, V B; Vinnik, D A; Bush, A; Gorshunov, B P; Alyabyeva, L N
Journal of physics. Conference series, 07/2021, Letnik: 1984, Številka: 1Journal Article
Abstract Single-crystalline lead substituted M-type barium hexaferrites doped with different concentrations of Al 3+ , synthesized by flux technique are investigated at terahertz and infrared frequencies (8-8000 cm −1 ). The spectra of reflection coefficient (R), transmission coefficient (T), complex dielectric permittivity ( ε ` and ε ``) were obtained using terahertz time-domain, and infrared Fourier transform spectrometers over a broadband frequency range 0.24-240 THz and at temperatures 5 K-300 K. The observed absorption lines are assigned to the electronic transitions within the fine-structured ground state of Fe 2+ ions at terahertz frequencies and to optical phonon mode at far-infrared frequencies. To analyze the origin of terahertz excitations in the compounds, we provided a model that accounts for the second-order spin-orbit interactions, the triagonal distortion of the crystal field, and the selection rules of the (C 3v ) point group symmetry of tetrahedral site-position of Fe 2+ .
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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