Low temperature magneto-transport and magnetic properties of MnSb$_2$Te$_4$ single crystals

Abstract

The results of a comprehensive study of MnSb$_2$Te$_4$ single crystals are presented. The structure, Raman spectra, low-temperature transport, Hall effect, magnetization, and magnetic susceptibility are studied. It was established that the crystals are ferromagnetic, with a Curie temperature ranging from 22 to 45\,K for different samples. Hall and magnetization measurements demonstrated that the system is a soft ferromagnet, which is of interest for practical applications.

Figures (12)

• Figure 1: Diffractogram of aMnSb$_2$Te$_4$ single crystal.
• Figure 2: Raman scattering spectrum in MnSb$_2$Te$_4$ single crystals
• Figure 3: (color online) Dispersion of phonon modes in MnSb$_2$Te$_4$ crystals (left) and partial density of states (PDOS) projected onto Mn, Sb, and Te atoms (right).
• Figure 4: (color online) Raman scattering spectra of crystals: a) MnSb$_2$Te$_4$ (1) and Sb$_2$Te$_3$ (2); b) Sb$_2$Te$_3$ in two different defect regions (1 and 2), c) MnBi$_2$Te$_4$ at different polarization of the exciting laser radiation ($\bf {E}_l$ and $\bf {E}_{rs}$ are the exciting laser field in the plane of the sample surface and the scattered light field, respectively); d) MnSb$_2$Te$_4$ at different polarization of the exciting laser radiation.
• Figure 5: (color online) a) Temperature dependence of the resistivity of MnSb$_2$Te$_4$ sample with $T_C=45\,$K. (b) Normalized resistivity $\rho/\rho_{max}$ of samples obtained in different syntheses, $\rho_{max}$ - resistivity of samples in the local maximum at $T=T_C$.