Magnetic and transport properties in magnetic topological insulators MnBi2Te4(Bi2Te3)n (n=1,2)

Abstract

The observation of quantized anomalous Hall conductance in the forced ferromagnetic state of MnBi2Te4 thin flakes has attracted much attentions. However, strong magnetic field is needed to fully polarize the magnetic moments due to the large antiferromagnetic interlayer exchange coupling. Here, we reported the magnetic and electrical transport properties of the magnetic van der Waals MnBi2Te4(Bi2Te3)n (n=1,2) single crystals, in which the interlayer antiferromagnetic exchange coupling is greatly suppressed with the increase of the separation layers Bi2Te3. MnBi4Te7 and MnBi6Te10 show weak antiferromagnetic transition at 12.3 and 10.5 K, respectively. The ferromagnetic hysteresis was observed at low temperature for both of the crystals, which is quite crucial for realizing the quantum anomalous Hall effect without external magnetic field. Our work indicates that MnBi2Te4(Bi2Te3)n (n=1,2) provide ideal platforms to investigate the rich topological phases with going to their 2D limits.

arXiv comment12 pages, 4 figures. Supporting informations not included. Accepted by Physical Review B

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• Using nonlocal surface transport to identify the axion insulator
• Tuning the magnetism and band topology through antisite defects in Sb doped MnBi4Te7
• Intrinsic quantum anomalous Hall phase induced by proximity in germanene/Cr${}_2$Ge${}_2$Te${}_6$ van der Waals heterostructure
• Pressure-tuned intralayer exchange in superlattice-like MnBi2Te4/(Bi2Te3)n topological insulators
• Hybridization-Induced Gapped and Gapless States on the Surfaces of Magnetic Topological Insulators
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• Mapping the Dirac fermions in intrinsic antiferromagnetic topological insulators (MnBi${}_2$Te${}_4$)(Bi${}_2$Te${}_3$)${}_n$ (n=0, 1)
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• Antiferromagnetic VdW Phase at the Interface of Sputtered Topological Insulator/Ferromagnet-Bi2Te3/Ni80Fe20 Heterostructures
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• Three-Dirac-fermion approach to unexpected universal gapless surface states of van der Waals magnetic topological insulators
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• Unusual dynamic susceptibility arising from soft ferromagnetic domains in MnBi8Te13 and Sb-doped MnBi2nTe3n+1 (n=2, 3)
• A Dirac-fermion approach and its application to design high Chern numbers in magnetic topological insulator multilayers
• On the half-quantized Hall conductance of massive surface electrons in magnetic topological insulator films
• Nonlinear Hall effect and scaling law in Sb-doped topological insulator MnBi4Te7
• Angle dependent field-driven reorientation transitions in uniaxial antiferromagnet MnBi${}_2$Te${}_4$ single crystal
• Electric and magnetic fields tuned spin-polarized topological phases in two-dimensional ferromagnetic MnBi${}_4$Te${}_7$
• Interface Engineering Enabled Low Temperature Growth of Magnetic Insulator on Topological Insulator
• Symmetry-driven anisotropic coupling effect in antiferromagnetic topological insulator: Mechanism for high-Chern-number quantum anomalous Hall state
• Single-layer magnet phase in intrinsic magnetic topological insulators, $[\mathrm{MnTe}][{\mathrm{Bi}}_2{\mathrm{Te}}_3{]}_{\mathrm{n}}$, far beyond the thermodynamic limit
• The orbital-driven topological phase transition and planar Hall responses in ternary tellurides Weyl semi-metals
• Synthesis of intrinsic magnetic topological insulator MnBi2nTe3n+1 family by chemical vapor transport method with feedback regulation