Issue 2, 2020

Antiferromagnetic topological insulator MnBi2Te4: synthesis and magnetic properties

Abstract

Recently, MnBi2Te4 has been discovered as the first intrinsic antiferromagnetic topological insulator (AFM TI), and it will become a promising material to discover exotic topological quantum phenomena. In this work, we have realized the successful synthesis of high-quality MnBi2Te4 single crystals by solid-state reactions. The as-grown MnBi2Te4 single crystal exhibits a van der Waals layered structure, which is composed of septuple Te–Bi–Te–Mn–Te–Bi–Te sequences as determined by X-ray diffraction and high-resolution high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM). The magnetic order below 25 K as a consequence of A-type antiferromagnetic interaction between Mn layers in the MnBi2Te4 crystal suggests the unique interplay between antiferromagnetism and topological quantum states. Moreover, the transport measurements of MnBi2Te4 single crystals further confirm its magnetic transition. This study on the first AFM TI of MnBi2Te4 will guide the future research on other potential candidates in the MBixTey family (M = Ni, V, Ti, etc.).

Graphical abstract: Antiferromagnetic topological insulator MnBi2Te4: synthesis and magnetic properties

Supplementary files

Article information

Article type
Paper
Submitted
17 10 2019
Accepted
04 12 2019
First published
05 12 2019

Phys. Chem. Chem. Phys., 2020,22, 556-563

Antiferromagnetic topological insulator MnBi2Te4: synthesis and magnetic properties

H. Li, S. Liu, C. Liu, J. Zhang, Y. Xu, R. Yu, Y. Wu, Y. Zhang and S. Fan, Phys. Chem. Chem. Phys., 2020, 22, 556 DOI: 10.1039/C9CP05634C

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