Comparative Study of Magnetic Properties of (Mn1−xA )Bi2Te4 AIV = Ge, Pb, Sn
Abstract
:1. Introduction
- The first approach involves the insertion of additional (m − 1) [BiTe] QLs between one [MnBiTe] SL resulting in the series of compounds MnBiTe with [14,19,20,21]. This series includes the homologous phases MnBiTe (m = 1:124), MnBiTe (m = 2:147), and MnBiTe (m = 3:16), all of which can be classified as AFM TIs. However, as the number of [BiTe] QLs increases, significant changes occur in the magnetic properties. For the 147 phase, T is already 13 K and H does not exceed 0.3 T. The phase 16 possesses an uncertain type of magnetic ordering which can be either AFM or FM, depending on growth conditions and the presence of defects [22,23]. For phases with higher m, the system resembles non-interacting 2D ferromagnets formed by the [MnBiTe] SL [21].
- The second approach is to substitute Bi atoms with Sb atoms, resulting in Mn(BiSb)Te compounds [24]. This substitution generally leads to an increase in the number of anti-site defects, such as Mn (Mn occupying the position of Bi or Sb atoms) [25,26]. Consequently, this substitution affects the magnetic order of the SL, transforming it from ferromagnetic to ferrimagnetic [18]. By adjusting the growth parameters, it is possible to further increase the number of anti-site defects and induce a transition from antiferromagnetic to ferromagnetic behavior in the ground state [26].
- Another way is to dilute Mn atoms in MnBiTe with non-magnetic atoms. The A = Ge, Pb, Sn elements can be chosen as suitable substituents. There are ternary TI compounds, such as ABiTe, with the same symmetry group as MnBiTe [13,27], allowing for arbitrary ratios of Mn substitution in solid solutions (MnA)BiTe. Several studies [28,29,30,31,32] have demonstrated the synthesis of these crystals and confirmed the absence of additional substitution defects, as in the case of substitution of Sb for Bi atoms. Moreover, this substitution appears to be isovalent and does not introduce any additional charge according to ARPES studies [32].
2. Materials and Methods
3. Results and Discussion
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
Abbreviations
ARPES | Angle-resolved photoemission spectroscopy |
AFM, FM, PM | Antiferromagnetic, ferromagnetic, paramagnetic |
EDC | Energy distribution curves |
EDX | Energy-dispersive X-ray spectroscopy |
H | Spin-flop transition field |
QAHE | Quantum anomalous Hall effect |
QL/SL | Quintuple [BiTe]/septuple [MnBiTe] layers block |
SQUID | Superconducting quantum interference device |
TI | Topological insulator |
T | Néel temperature |
XPS | X-ray photoemission spectroscopy |
ZFC, FC | Zero field cooled, field cooled |
Phases 124, 147, 16 | (MnA)BiTe with m = 1, 2, 3 (A = Ge, Pb, Sn) |
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Estyunin, D.A.; Rybkina, A.A.; Kokh, K.A.; Tereshchenko, O.E.; Likholetova, M.V.; Klimovskikh, I.I.; Shikin, A.M.
Comparative Study of Magnetic Properties of (Mn1−xA
Estyunin DA, Rybkina AA, Kokh KA, Tereshchenko OE, Likholetova MV, Klimovskikh II, Shikin AM.
Comparative Study of Magnetic Properties of (Mn1−xA
Estyunin, Dmitry A., Anna A. Rybkina, Konstantin A. Kokh, Oleg E. Tereshchenko, Marina V. Likholetova, Ilya I. Klimovskikh, and Alexander M. Shikin.
2023. "Comparative Study of Magnetic Properties of (Mn1−xA