Pressure-tunable magnetic topological phases in magnetic topological insulator MnSb4Te7

TL;DR

This study investigates how applying high pressure affects the magnetic and topological properties of MnSb4Te7, revealing a magnetic phase transition and persistent anomalous Hall conductance, which advances understanding of magnetic topological insulators.

Contribution

It provides the first high-pressure experimental and theoretical analysis of magnetic phase transitions and Hall effects in MnSb4Te7, a magnetic topological insulator.

Findings

Magnetic phase transition from antiferromagnetic to ferromagnetic at 3.78 GPa.

The rhombohedral crystal structure remains stable up to 8 GPa.

Intrinsic anomalous Hall conductance persists after the phase transition.

Abstract

Magnetic topological insulators, 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 up to 8 GPa. The anomalous Hall conductance {\sigma}xyA keeps around 10 {\Omega}-1 cm-1, dominated by the 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.