Possible high-temperature magnetically topological material Mn₃Bi₂Te₆

2023/04/08 by Wen-Feng Wu, Hanyu Wang, Wu, Wen-Feng +11
Materials Science · Physics and Astronomy · #Magnetic and transport properties of perovskites and related materials #Topological Materials and Phenomena #Multiferroics and related materials

paper · pdf · doi:10.48550/arxiv.2304.03971

Abstract

The Mn-Bi-Te family displaying magnetism and non-trivial topological properties has received extensive attention. Here, we predict that the antiferromagnetic structure of Mn₃Bi₂Te₆ with three MnTe layers is energetically stable and the magnetic coupling strength of Mn-Mn is enhanced four times compared with that in the single MnTe layer of MnBi₂Te₄. The predicted Néel transition point is higher than 77 K, the liquid-nitrogen temperature. The topological properties show that with the variation of the MnTe layer from a single layer to three layers, the system transforms from a nontrivial topological phase to a trivial topological phase. Interestingly, the ferromagnetic state of Mn₃Bi₂Te₆ is a topological semimetal and it exhibits a topological transition from trivial to nontrivial induced by the magnetic transition. Our results enrich the Mn-Bi-Te family system, offer a new platform for studying topological phase transitions, and pave a new way to improve the working temperature of magnetically topological devices.

Related

• Topological Phases of MnA₂X₄ (A=Bi, Sb; X = Se, Te) under Magnetic Field
• Ubiquitous Order-Disorder Transition in the Mn Antisite Sublattice of the (MnBi2Te4)(Bi2Te3)n Magnetic Topological Insulators
• Subtle metastability of the layered magnetic topological insulator MnBi2Te4 from weak interactions
• Synthesis of intrinsic magnetic topological insulator MnBi2nTe3n+1 family by chemical vapor transport method with feedback regulation
• The Layer-inserting Growth of Antiferromagnetic Topological Insulator MnBi₂Te₄ Based on Symmetry and Its X-ray Photoelectron Spectroscopy