Synthesis of Intrinsic Magnetic Topological Insulator MnBi<sub>2n</sub>Te<sub>3n+1</sub> Family by Chemical Vapor Transport Method with Feedback Regulation
Abstract
AbstractMnBi2nTe3n+1 is a representative family of intrinsic magnetic topological insulators, in which numerous exotic phenomena such as the quantum anomalous Hall effect are expected. The high‐quality crystal growth and magnetism manipulation are the most essential processes. Here a modified chemical vapor transport method using a feedback‐regulated strategy is developed, which provides the closed‐loop control of growth temperature within ± 0.1 °C. Single crystals of MnBi2Te4, MnBi4Te7, and MnBi6Te10 are obtained under different temperature intervals respectively, and show variable tunability on magnetism by finely tuning the growth temperatures. Specifically, the cold‐end temperatures not only vary the strength of antiferromagnetic coupling in MnBi2Te4, but also induce magnetic ground state transitions from antiferromagnetism to ferromagnetism in MnBi4Te7 and MnBi6Te10. In MnBi2Te4 with optimized magnetism, quantized transport with Chern insulator state can be easily replicated. These results provide a systematic picture for the crystal growth and the rich magnetic tunability of MnBi2nTe3n+1 family, providing richer platforms for the related researches combining magnetism and topological physics.
Article Details
Authors (19)
Heng Zhang
Yiying Zhang
Yong Zhang
Bo Chen
Jingwen Guo
Yu Du
Key Laboratory of Material Simulation Methods and Software of Ministry of Education, College of Physics
Jiajun Li
Fuwei Zhou
National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Physical Science Research Center, Nanjing University 1 , Nanjing 210093,
Fengyi Guo
Yongxin Zhang
Zixiang Zhao
National Laboratory of Solid State Microstructures School of Physics School of Materials Science and Intelligent Engineering Collaborative Innovation Center of Advanced Microstructures Jiangsu Physical Science Research Center Nanjing University Nanjing 210093 China
Hangkai Xie
National Laboratory of Solid State Microstructures School of Physics School of Materials Science and Intelligent Engineering Collaborative Innovation Center of Advanced Microstructures Jiangsu Physical Science Research Center Nanjing University Nanjing 210093 China
Zhixin Zhang
State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Guangdong Provincial Key Laboratory of Applied Marine Biology, Chinese Academy of Sciences
Tianqi Wang
Wuyi Qi
National Laboratory of Solid State Microstructures School of Physics School of Materials Science and Intelligent Engineering Collaborative Innovation Center of Advanced Microstructures Jiangsu Physical Science Research Center Nanjing University Nanjing 210093 China
You Song
Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation, Department of Physics, Zhejiang Sci-Tech University 1
Fucong Fei
Xuefeng Wang
Beijing National Laboratory for Condensed Matter Physics
Fengqi Song