Magnetism-induced topological transition in EuAs3

The nature of the interaction between magnetism and topology in magnetic topological semimetals remains mysterious, but may be expected to lead to a variety of novel physics. We systematically studied the magnetic semimetal EuAs3, demonstrating a magnetism-induced topological transition from a topological nodal-line semimetal in the paramagnetic or the spin-polarized state to a topological massive Dirac metal in the antiferromagnetic ground state at low temperature. The topological nature in the antiferromagnetic state and the spin-polarized state has been verified by electrical transport measurements. An unsaturated and extremely large magnetoresistance of similar to 2 x 10(5)% at 1.8 K and 28.3 T is observed. In the paramagnetic states, the topological nodal-line structure at the Y point is proven by angle-resolved photoemission spectroscopy. Moreover, a temperature-induced Lifshitz transition accompanied by the emergence of a new band below 3 K is revealed. These results indicate that magnetic EuAs3 provides a rich platform to explore exotic physics arising from the interaction of magnetism with topology.

Automated summary

The study on magnetic topological semimetals found that magnetism-induced topological transition in EuAs3 from a topological nodal-line semimetal to a topological massive Dirac metal. The topological nature in different states was verified by electrical transport measurements and angle-resolved photoemission spectroscopy. Additionally, an extremely large magnetoresistance and a temperature-induced Lifshitz transition were observed, indicating a rich platform for exploring exotic physics.