Magnetism-induced topological transition in EuAs3

Journal article

AbstractThe 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 ~2 × 105% 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.

Authors: Cheng, E; Xia, W; Shi, X; Fang, H; Wang, C

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Nature Research
• Journal: Nature Communications
• Volume: 12
• Issue: 1
• Pages: 6970
• Article number: 6970
• Publication date: 2021-11-30
• DOI: 10.1038/s41467-021-26482-7
• EISSN: 2041-1723
• ISSN: 2041-1723
• Language: English
• Keywords: Paramagnetism; Topological order; Condensed matter physics; Magnetic field; Band gap; Magnetoresistance; Topology (electrical circuits); Ground state; Physics; Topological insulator; Antiferromagnetism; Semimetal; Quantum mechanics; Magnetism