Pressure-tunable magnetic topological phases in magnetic topological insulator MnSb4Te7

• Published in: Applied physics letters 2023-04, Vol.122 (17)
• Main Authors: Gao, Lingling, Wu, Juefei, Xi, Ming, Pei, Cuiying, Wang, Qi, Zhao, Yi, Tian, Shangjie, Li, Changhua, Cao, Weizheng, Chen, Yulin, Lei, Hechang, Qi, Yanpeng
• Format: Article
• Language: English
• Subjects: Antiferromagnetism; Applied physics; Electronic structure; Ferromagnetism; First principles; Hall effect; High pressure; Magnetism; Phase transitions; Physical properties; Topological insulators; Topology
• ISSN: 0003-6951; 1077-3118
• DOI: 10.1063/5.0146605

Magnetic topological insulators (TIs), possessing both magnetic order and topological electronic structure, provides an excellent platform to research unusual physical properties. Here, we report a high-pressure study on the anomalous Hall effect of magnetic TI MnSb4Te7 through transports measurements combined with first-principle theoretical calculations. We discover that the ground state of MnSb4Te7 experiences a magnetic phase transition from the A-type antiferromagnetic state to ferromagnetic dominating state at 3.78 GPa, although its crystal sustains a rhombohedral phase under high pressures. The anomalous Hall conductance σxyA is dominated by intrinsic mechanism even after the magnetic phase transition. The results shed light on the intriguing magnetism in MnSb4Te7 and pave the way for further studies of the relationship between topology and magnetism in topological materials.