Abstract
The temperature–frequency spectra of the complex dielectric permittivity of the LuFe2O4 multiferroics have been studied in the temperature range 100–400 K at frequencies 20 Hz–120 MHz. It is found that the temperature coefficient of the dielectric permittivity changes its sign and the ac conductivity has maxima and minima in the temperature range ~150–350 K and in the frequency range ~30–120 MHz. These specific features are due to independent resonance mechanisms: the coincidence of frequency of the measuring ac voltage with the frequency of electron jumps as the hopping conductivity takes place; the proximity of the measurement signal period to the time of formation of a barrier layer at the boundary of contact with the sample; and the approximation of the frequency of an ac external field to the frequency of the sample structural elements.
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This work was supported by state task of the Ministry of Science and Higher Education of the Russian Federation, theme AAAA-A17-117021310366-5.
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Translated by Yu. Ryzhkov
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Gadzhiev, G.M., Gamzatov, A.G., Aliev, R.A. et al. Temperature–Frequency Dependence of the Dielectric Response in LuFe2O4 Multiferroics. Phys. Solid State 62, 765–769 (2020). https://doi.org/10.1134/S1063783420050066
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DOI: https://doi.org/10.1134/S1063783420050066