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CONDENSED MATTER
Temperature studies of raman spectra in MnBi$_2$Te$_4$ and MnSb$_2$Te$_4$ magnetic topological insulators
A. A. Maksimova, I. I. Tartakovskiia, Z. S. Alievb, I. R. Amireslanovbc, N. A. Abdullaevcb, V. N. Zvereva, Z. A. Jahangirlibc, I. Yu. Sklyadnevad, M. M. Otrokovef, N. T. Mamedovcb, E. V. Chulkovgh a Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia
b Baku State University, Baku, AZ1148 Azerbaijan
c Institute of Physics, Azerbaijan National Academy of Sciences, Baku, AZ1141 Azerbaijan
d Tomsk State University, Tomsk, 634050 Russia
e Centro de Fisica de Materiales (CFM-MPC), Centro Mixto CSIC-UPV/EHU,
Donostia-San Sebastián, Basque Country, 20018 Spain
f IKERBASQUE, Basque Foundation for Science, Bilbao, 48011 Spain
g Departamento de Polímeros y Materiales Avanzados: Física, Química y Tecnología, Facultad de Ciencias Químicas,
Universidad del Pas Vasco UPV/EHU, San Sebastián/Donostia, Basque Country, 20080 Spain
h St. Petersburg State University, St. Petersburg, 198504 Russia
Abstract:
Raman spectra of magnetic topological crystalline insulators in a wide temperature range including the magnetic ordering region are studied in detail. The anharmonicity parameters and Grüneisen mode parameters of Raman-active phonons in the studied crystals have been determined. It has been shown that the temperature dependence of the frequency of the $A^{(1)}_{\text{1g}}$ (${\sim}\,48$ cm$^{-1}$) phonon in MnSb$_2$Te$_4$ coincides within $\sim 0.1$ cm$^{-1}$ with the standard anharmonic model disregarding the spin–phonon coupling. The polarization dependences of Raman spectra in the MnSb2Te4 crystals indicate that Sb and Mn atoms are strongly mixed in them unlike the isostructural MnBi$_2$Te$_4$ crystals.
Received: 25.07.2023 Revised: 08.08.2023 Accepted: 08.08.2023
Citation:
A. A. Maksimov, I. I. Tartakovskii, Z. S. Aliev, I. R. Amireslanov, N. A. Abdullaev, V. N. Zverev, Z. A. Jahangirli, I. Yu. Sklyadneva, M. M. Otrokov, N. T. Mamedov, E. V. Chulkov, “Temperature studies of raman spectra in MnBi$_2$Te$_4$ and MnSb$_2$Te$_4$ magnetic topological insulators”, Pis'ma v Zh. Èksper. Teoret. Fiz., 118:5 (2023), 361–366; JETP Letters, 118:5 (2023), 357–362
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https://www.mathnet.ru/eng/jetpl7031 https://www.mathnet.ru/eng/jetpl/v118/i5/p361
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Abstract page: | 54 | References: | 17 | First page: | 3 |
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