Temperature Studies of Raman Spectra in MnBi2Te4 and MnSb2Te4 Magnetic Topological Insulators

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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 A1g(1)">A1g(1) (~48 cm–1) phonon in MnBi2Te4 coincides within ±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 MnBi2Te4 crystals.

About the authors

A. A. Maksimov

Institute of Solid State Physics, Russian Academy of Sciences

Email: maksimov@issp.ac.ru
142432, Chernogolovka, Moscow region, Russia

I. I. Tartakovskiy

Institute of Solid State Physics, Russian Academy of Sciences

Email: maksimov@issp.ac.ru
142432, Chernogolovka, Moscow region, Russia

Z. S. Aliev

Baku State University

Email: maksimov@issp.ac.ru
AZ1148, Baku, Azerbaijan

I. R. Amiraslanov

Baku State University;Institute of Physics, Azerbaijan National Academy of Sciences

Email: maksimov@issp.ac.ru
AZ1148, Baku, Azerbaijan;AZ1141, Baku, Azerbaijan

N. A. Abdullaev

Baku State University;Institute of Physics, Azerbaijan National Academy of Sciences

Email: maksimov@issp.ac.ru
AZ1148, Baku, Azerbaijan;AZ1141, Baku, Azerbaijan

V. N. Zverev

Institute of Solid State Physics, Russian Academy of Sciences

Email: maksimov@issp.ac.ru
142432, Chernogolovka, Moscow region, Russia

Z. A. Dzhakhangirli

Baku State University;Institute of Physics, Azerbaijan National Academy of Sciences

Email: maksimov@issp.ac.ru
AZ1148, Baku, Azerbaijan;AZ1141, Baku, Azerbaijan

I. Yu. Sklyadneva

Tomsk State University

Email: maksimov@issp.ac.ru
634050, Tomsk, Russia

M. M. Otrokov

Centro de Fisica de Materiales (CFM-MPC);IKERBASQUE, Basque Foundation for Science

Author for correspondence.
Email: maksimov@issp.ac.ru
2018, Donostia-San Sebastián, Basque Country, Spain; 48011, Bilbao, Spain

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