Study of low-temperature magnetic properties of the antiferromagnetic topological insulator Sm-doped MnBi2Te4

Author:

Ou X. L.12,Wang J.23,Zhao K.1ORCID,Yang X. S.2,Zhao Y.24

Affiliation:

1. School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, P. R. China

2. Superconductivity and New Energy R&D Center, Southwest Jiaotong University, Chengdu 610031, P. R. China

3. School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. China

4. College of Physics and Energy, Fujian Normal University, Fuzhou 350117, P. R. China

Abstract

MnBi2Te4 is the first discovered intrinsic magnetic topological insulator. It has great research significance and is related to new phenomena such as topological magneto-electric effect and quantum anomalous Hall effect (QAHE). We report first doping of rare-earth elements in MnBi2Te4 crystals. MnBi2Te4 crystalline samples with different Sm doping ratios were synthesized, and Sm atoms may enter the lattice and replace Mn atoms. Low-temperature magnetization measurements show that, in addition to the antiferromagnetic (AFM) transition of MnBi2Te4, some doped samples undergo small-scale ferromagnetic transitions at around 15 K. Doping furthermore reduces the magnetic field required for the transition to the canted AFM (CAFM) state and slightly increases the Néel temperature of the crystal. Our results suggest that doping rare-earth elements may be a feasible method for tuning the magnetism of MnBi2Te4 and for future applications of magnetic topological insulators.

Funder

Program of International S&T Cooperation

National Magnetic Confinement Fusion Program of China

National Natural Science Foundation of China

863 Program

Applied Basic Research Program of Sichuan Province

Publisher

World Scientific Pub Co Pte Ltd

Subject

Condensed Matter Physics,Statistical and Nonlinear Physics

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