Peculiarities of the electronic properties in the intrinsic magnetic topological insulator MnBi2Te4

•The electrical and optical properties of MnBi2Te4 were studied.•The anisotropy of the electrical conductivity of MnBi2Te4 was found.•The optical spectrum of MnBi2Te4 is formed by interband transitions of charge carriers. The electrical conductivity σ0(T) of single-crystal and polycrystalline sample...

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Bibliographic Details
Published in:Materials letters 2024-07, Vol.367, p.136591, Article 136591
Main Authors: Marchenkov, Vyacheslav V., Perevalova, Alexandra N., Fominykh, Bogdan M., Shreder, Elena I., Naumov, Sergey V., Marchenkova, Elena B.
Format: Article
Language:English
Subjects:
Crystal growth
Electrical conductivity
Intrinsic magnetic topological insulator MnBi2Te4
Optical properties
Polycrystal
Single crystal
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Summary:•The electrical and optical properties of MnBi2Te4 were studied.•The anisotropy of the electrical conductivity of MnBi2Te4 was found.•The optical spectrum of MnBi2Te4 is formed by interband transitions of charge carriers. The electrical conductivity σ0(T) of single-crystal and polycrystalline samples of the intrinsic magnetic topological insulator MnBi2Te4 was measured in the temperature range from 5 to 300 K. The optical characteristics σ(ω), ɛ1(ω), ɛ2(ω) and R(λ) of MnBi2Te4 were studied in the spectral range from 1250 to 36000 cm−1 at room temperature. The anisotropy of the electrical conductivity of MnBi2Te4 was found, which arises due to the additional contribution from scattering on layer boundaries. The optical spectrum of MnBi2Te4 is formed predominantly due to interband absorption of a light wave. Despite the qualitatively similar behavior of the optical characteristics, there is some difference between poly- and single crystals in infrared region.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2024.136591